JPH10288556A - Temperature measuring device of piston - Google Patents

Temperature measuring device of piston

Info

Publication number
JPH10288556A
JPH10288556A JP11347697A JP11347697A JPH10288556A JP H10288556 A JPH10288556 A JP H10288556A JP 11347697 A JP11347697 A JP 11347697A JP 11347697 A JP11347697 A JP 11347697A JP H10288556 A JPH10288556 A JP H10288556A
Authority
JP
Japan
Prior art keywords
piston
lead wire
temperature
coil spring
piston rod
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.)
Withdrawn
Application number
JP11347697A
Other languages
Japanese (ja)
Inventor
Keizo Goto
敬造 後藤
Yasuo Kato
保雄 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP11347697A priority Critical patent/JPH10288556A/en
Publication of JPH10288556A publication Critical patent/JPH10288556A/en
Withdrawn legal-status Critical Current

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  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the inclusion of noise in the transfer of a temperature measurement signal to allow a multipoint measurement by guiding a lead wire delivered from a temperature measuring point to a scavenging chamber along a coil spring installed to a piston rod, and then delivering it to the outside. SOLUTION: The temperature measurement signals from a plurality of temperature sensors mounted on a piston 3 are transferred to a temperature measurement data processing part from the opening part 9 of a scavenging chamber 5 through a lead wire 21 along a coil spring 20 installed onto the circumference of a piston rod 4. Since the temperature measurement signals are directly taken to the outside through the lead wire 21 without interposing a wireless machine, a highly precise temperature measurement data can be provided without inclusion of electric noise. Even if the number of temperature measuring points is increased, the multipoint measurement can be easily performed only by increasing the number of signal lines of the lead wire 21. Since the lead wire 21 is wound along the coil spring 20, the breaking of the lead wire 21 by expansion of the piston rod 4 can be effectively prevented.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はクロスヘッド式内燃
機関、特にクロスヘッド式大型ディーゼル機関におけ
る、ピストンの温度計測装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the temperature of a piston in a crosshead type internal combustion engine, particularly in a large crosshead type diesel engine.

【0002】[0002]

【従来の技術】大型ディーゼル機関用ピストンの内部温
度計測は、ピストン壁内部の所定位置に多数取り付けら
れた温度センサによってなされているが、ピストンがシ
リンダライナ内を往復動するため、前記温度センサから
の計測信号引き出し用のリード線の撓みや断線を阻する
ための処置がなされている。
2. Description of the Related Art The temperature inside a piston for a large diesel engine is measured by a large number of temperature sensors mounted at predetermined positions inside a piston wall. However, since the piston reciprocates in a cylinder liner, the temperature from the temperature sensor is measured. In order to prevent the bending or disconnection of the lead wire for extracting the measurement signal, a measure is taken.

【0003】図2は、かかるピストンの温度計測装置に
おける計測用導線の引き出し手段の従来技術を示す断面
構成図である。図2において、1はシリンダライナ、2
はシリンダカバー、3は前記シリンダライナ1内を往復
摺動するピストン、4は該ピストン3の下面にボルト
(図示省略)により固定されたピストン棒である。8は
シリンダブロッック、5は該シリンダブロック8内に形
成された掃気室、7は該掃気室5とクランク室(図示省
略)とを仕切る隔壁である。6は該隔壁7の中央部に固
定されたパッキン箱であり、前記ピストン棒の外周に摺
動して掃気室5と前記クランク室との間を流体密にシー
ルしている。
FIG. 2 is a sectional view showing a prior art of a lead-out means of a measuring lead in such a piston temperature measuring device. In FIG. 2, 1 is a cylinder liner, 2
Denotes a cylinder cover, 3 denotes a piston that reciprocates in the cylinder liner 1, and 4 denotes a piston rod fixed to the lower surface of the piston 3 by bolts (not shown). 8 is a cylinder block, 5 is a scavenging chamber formed in the cylinder block 8, and 7 is a partition separating the scavenging chamber 5 and a crank chamber (not shown). Reference numeral 6 denotes a packing box fixed to the center of the partition wall 7, which slides on the outer periphery of the piston rod to seal the space between the scavenging chamber 5 and the crank chamber in a fluid-tight manner.

【0004】かかるクロスヘッド式大型ディーゼル機関
のピストン3の温度計測を行なう際には、該ピストン3
の所要各部に取付けられた温度センサ(図示省略)のリ
ード線は、ピストン3の下部に設けられたテレメータ発
信器9に接続される。そして該テレメータ発信器9から
発信される温度計測信号は、掃気室5内に設けられた受
信用アンテナ10に接続されているリード線21により
掃気室5の開口部9から外部に取り出される。
When measuring the temperature of the piston 3 of such a crosshead type large diesel engine, the piston 3
A lead wire of a temperature sensor (not shown) attached to each required part is connected to a telemeter transmitter 9 provided below the piston 3. The temperature measurement signal transmitted from the telemeter transmitter 9 is extracted to the outside from the opening 9 of the scavenging chamber 5 by a lead wire 21 connected to a receiving antenna 10 provided in the scavenging chamber 5.

【0005】[0005]

【発明が解決しようとする課題】かかる従来技術による
ピストンの温度計測装置においては、ピストン3に取付
けられたテレメータ発信器9からの温度計測信号を受信
するアンテナ10を掃気室5内に設けているため、言換
えればその間は無線により信号を送受信する為に、送信
部と受信部との間にある電送空間内における潤滑油の飛
散や壁面の汚染、さらには前記アンテナ10の設置方法
等によって、電気的ノイズがピストン温度の計測信号に
入り込み、計測精度の低下を来すという問題点がある。
また、かかるピストン温度計測装置においては、可動部
側であるピストン3に設置されるテレメータ発信器9の
容量によってピストン温度の計測点数が制限され、多点
での計測により高精度の温度分布が得られ難いという問
題点もある。
In such a prior art piston temperature measuring device, an antenna 10 for receiving a temperature measurement signal from a telemeter transmitter 9 attached to the piston 3 is provided in the scavenging chamber 5. Therefore, in other words, in order to transmit and receive signals by radio during that time, scattering of lubricating oil and contamination of wall surfaces in the transmission space between the transmission unit and the reception unit, and further depending on the installation method of the antenna 10, etc. There is a problem that the electrical noise enters the measurement signal of the piston temperature, which lowers the measurement accuracy.
Further, in such a piston temperature measuring device, the number of measurement points of the piston temperature is limited by the capacity of the telemeter transmitter 9 installed on the piston 3 on the movable portion side, and a high-precision temperature distribution is obtained by measurement at multiple points. There is also a problem that it is difficult to be performed.

【0006】本発明はかかる従来技術の課題に鑑み、ピ
ストン温度計測信号の電送中に該計測信号への電気的ノ
イズの混入が阻止されるとともに、ピストン温度の計測
点が計測信号の電送手段によって制限されることなく多
点計測が可能なピストンの温度計測装置を提供すること
を目的とする。
SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention prevents the electrical noise from being mixed into the measurement signal while transmitting the piston temperature measurement signal, and the measurement point of the piston temperature is determined by the measurement signal transmission means. It is an object of the present invention to provide a piston temperature measurement device capable of multipoint measurement without limitation.

【0007】[0007]

【課題を解決するための手段】本発明はかかる課題を解
決するため、ピストンの下部にピストン棒の上端を固定
し、該ピストン棒の下端をクロスヘッドに連結してなる
クロスヘッド式内燃機関において、前記ピストン棒の外
周にコイルスプリングを、廻り止めした状態でピストン
棒上端より掃気室側まで介装するとともに、前記ピスト
ンの温度計測点から導出したリード線を前記コイルスプ
リングに沿って掃気室へ導き、該掃気室から外部に引き
出すように構成したピストンの温度計測装置を提案す
る。この場合廻り止め手段はスプリングの両端を固定さ
せて回動を阻止してもよく、又前記ピストン軸の周面に
スプリング固定手段を設けてもよい。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a crosshead type internal combustion engine in which an upper end of a piston rod is fixed to a lower part of a piston and a lower end of the piston rod is connected to a crosshead. A coil spring is provided around the outer periphery of the piston rod from the upper end of the piston rod to the scavenging chamber side in a state where the coil spring is prevented from rotating, and a lead wire derived from a temperature measurement point of the piston is transferred to the scavenging chamber along the coil spring. A temperature measuring device for a piston, which is configured to be guided and drawn out of the scavenging chamber, is proposed. In this case, the anti-rotation means may fix both ends of the spring to prevent the rotation, or a spring fixing means may be provided on the peripheral surface of the piston shaft.

【0008】かかる発明によれば、ピストンに取付けら
れた複数の温度センサからのリード線はコイルスプリン
グに沿って掃気室まで導かれるが、ピストンの往復動に
よるストローク変化に従がいコイルスプリングが伸縮す
ることにより、該コイルスプリングとともにリ−ド線も
撓むので、該リ−ド線は断線することなく、上記温度セ
ンサからの温度計測信号を伝送する。従って、図2に示
す従来技術のようにピストンに設けた温度計測信号の送
信側と掃気室内に設けた受信側とが無線で送信する事な
く有線で送信されるために、温度計測信号は温度センサ
から直接リ−ド線を介して伝送されることとなり、この
結果、従来技術のような電気的ノイズの侵入は無く、正
確な計測デ−タが得られる。
According to this invention, the lead wires from the plurality of temperature sensors attached to the piston are guided to the scavenging chamber along the coil spring, but the coil spring expands and contracts according to the stroke change due to the reciprocation of the piston. As a result, the lead wire bends together with the coil spring, so that the lead wire transmits the temperature measurement signal from the temperature sensor without breaking. Therefore, since the transmitting side of the temperature measurement signal provided in the piston and the receiving side provided in the scavenging chamber are transmitted by wire without wireless transmission as in the prior art shown in FIG. The signal is transmitted directly from the sensor via the lead wire, and as a result, there is no intrusion of electric noise unlike the prior art, and accurate measurement data can be obtained.

【0009】また温度センサからのリ−ド線をコイルス
プリングに沿わせて掃気室の引き出し部に導いているの
で、従来技術に係るテレメ−タ発信器のような容量の制
限が無く、リ−ド線の数を増加することにより多点計測
がきわめて容易にでき、高精度にピストンの温度分布を
測定できる。
Further, since the lead wire from the temperature sensor is guided along the coil spring to the draw-out portion of the scavenging chamber, there is no limit on the capacity as in the telemeter transmitter according to the prior art. By increasing the number of lead wires, multipoint measurement can be extremely easily performed, and the temperature distribution of the piston can be measured with high accuracy.

【0010】[0010]

【発明の実施の形態】以下、図面を参照して本発明の好
適な実施形態を例示的に詳しく説明する。但しこの実施
形態に記載されている構成部品の寸法、材質、形状、そ
の相対的配置等は特に特定的な記載がないかぎりは、こ
の発明の範囲をそれに限定する趣旨ではなく、単なる説
明例にすぎない。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

【0011】図1は本発明の実施形態に係る大型ディ−
ゼル機関用ピストン温度計測装置の構成図である。図1
において、1はシリンダライナ、2はシリンダカバ−、
3は前記シリンダライナ1内を往復摺動するピストン、
4は該ピストン3の下面にボルト(図示省略)により固
定されピストン3とともに往復動するピストン棒であ
る。該ピストン棒4の下端はクロスヘッド(図示省略)
に連結されている。8はシリンダブロック、5は該シリ
ンダブロック8内に形成された掃気室、7は該掃気室5
とクランク室(図示省略)とを仕切る隔壁である。6は
該隔壁7の中央部に固定されたパッキン箱であり、これ
の内部に収納されたパッキンが前記ピストン棒4の外周
に摺接して掃気室5と前記クランク室との間を流体密に
シ−ルしている。
FIG. 1 shows a large-sized disk according to an embodiment of the present invention.
It is a lineblock diagram of a piston temperature measuring device for zel engines. FIG.
, 1 is a cylinder liner, 2 is a cylinder cover,
3 is a piston which reciprocates in the cylinder liner 1;
Reference numeral 4 denotes a piston rod fixed to the lower surface of the piston 3 by bolts (not shown) and reciprocating with the piston 3. The lower end of the piston rod 4 is a crosshead (not shown).
It is connected to. 8 is a cylinder block, 5 is a scavenging chamber formed in the cylinder block 8, and 7 is a scavenging chamber 5
And a crank chamber (not shown). Numeral 6 denotes a packing box fixed to the center of the partition wall 7. The packing accommodated therein slides on the outer periphery of the piston rod 4 to make the space between the scavenging chamber 5 and the crank chamber fluid-tight. I'm sealing.

【0012】20は上記ピストン棒4の外周にその軸方
向に沿って巻回されるように介装されたコイルスプリン
グである。該コイルスプリング20は廻り止めのため、
上端をピストン3の下面に、下端を前記パッキン箱6の
上面にそれぞれ固定されている。また、該コイルスプリ
ング20は、ピストン3が上死点にあるとき最も伸点
し、ピストン3が下死点にあるとき最も縮小するが、こ
の最小縮小時に密着せず、かつその繰返しせん断応力が
疲労限以下になるようにその線径、取付長さ、巻数、コ
イル平均径、取付荷重等が設定されている。
Reference numeral 20 denotes a coil spring interposed around the outer periphery of the piston rod 4 along the axial direction thereof. The coil spring 20 is used to prevent rotation.
The upper end is fixed to the lower surface of the piston 3, and the lower end is fixed to the upper surface of the packing box 6. The coil spring 20 extends most when the piston 3 is at the top dead center, and contracts most when the piston 3 is at the bottom dead center. The wire diameter, the mounting length, the number of windings, the average coil diameter, the mounting load, and the like are set so as to be less than the fatigue limit.

【0013】21は温度センサの数に対応する信号線が
束ねられたリ−ド線(ハーネス)で、前記ピストン3の
各計測点に取付けられた複数の温度センサ(図示省略)
に接続されるとともに、前記コイルスプリング20の外
周に沿って巻回されながらピストン棒4の下部へと延
び、該コイルスプリング20の下端部でこれと分離して
掃気室5の底部の隔壁7上を開口部9まで配線され、該
開口部9から引き出されて、温度計測デ−タ処理装置
(図示省略)に接続されている。尚、上記リ−ド線21
は断線を防止するため、上端のピストン3側の取付部及
び下端のパッキン箱6側取付部に若干緩みを持たせてい
る。
Reference numeral 21 denotes a lead wire (harness) in which signal lines corresponding to the number of temperature sensors are bundled, and a plurality of temperature sensors (not shown) attached to each measurement point of the piston 3.
And extends to the lower part of the piston rod 4 while being wound along the outer periphery of the coil spring 20, and separates from the lower end of the coil spring 20 at the bottom of the scavenging chamber 5 on the partition wall 7. Is wired to the opening 9, pulled out from the opening 9, and connected to a temperature measurement data processing device (not shown). The lead wire 21
In order to prevent disconnection, the mounting portion on the piston 3 side at the upper end and the mounting portion on the packing box 6 at the lower end are slightly loosened.

【0014】かかるピストンの温度計測装置を装備した
燃焼機関(大型ディ−ゼル機関)の運転時において、ピ
ストン3が上死点にあるときにコイルスプリング20は
最も伸張しており、該ピストン3が下降するとピストン
3の下面とパッキン箱6の上面との間で圧縮されて縮長
する。かかるコイルスプリング20の縮長に従がい、該
コイルスプリング20の外周に沿って配線されているリ
−ド線21もコイルスプリング20とともに動くが、該
リ−ド線21のピストン3側の取付部とパッキン箱6側
取付部との間の長さは、コイルスプリング20のコイル
巻線に沿った長さとかつ上・下端に若干の緩みを持たせ
ているので、ピストン3の往復動によりリ−ド線21が
断線することは無い。又コイルスプリング20のコイル
巻線に沿ってリ−ド線21が巻回されているためにピス
トン棒4が縮長された場合でも、リ−ド線21がU字状
に外方に向って撓むようなこともなく、リ−ド線21の
断線が有効に阻止される。
During operation of a combustion engine (large diesel engine) equipped with such a piston temperature measuring device, when the piston 3 is at the top dead center, the coil spring 20 is most extended, and the piston 3 When it descends, it is compressed between the lower surface of the piston 3 and the upper surface of the packing box 6 and contracted. According to the reduction of the length of the coil spring 20, the lead wire 21 wired along the outer periphery of the coil spring 20 also moves with the coil spring 20, but the mounting portion of the lead wire 21 on the piston 3 side is provided. The length between the coil box 20 and the mounting portion on the packing box 6 side is along the coil winding of the coil spring 20 and the upper and lower ends are slightly loosened. The wire 21 does not break. Even if the piston rod 4 is shortened because the lead wire 21 is wound along the coil winding of the coil spring 20, the lead wire 21 is directed outward in a U-shape. Disconnection of the lead wire 21 is effectively prevented without bending.

【0015】上記のようにして、ピストン3に取付けら
れた複数の温度センサからの温度計測信号はコイルスプ
リング20に沿ったリ−ド線21を経て掃気室5の開口
部9から温度計測デ−タ処理装置(図示省略)に伝送さ
れ所定の処理がなされる。かかる計測時において、ピス
トン3に取付けられた温度センサからの温度計測信号は
無線機等を介在させる事なく、直接リ−ド線21を介し
て外部に取り出されるので、従来技術のように、電気ノ
イズが侵入するこたが無く、高精度の温度計測デ−タが
得られる。また、かかる装置は、上記ピストンの温度計
測点数が増加してもリ−ド線の信号線数を増加すれば、
容易に多点計測が可能となる。
As described above, the temperature measurement signals from the plurality of temperature sensors attached to the piston 3 are transmitted from the opening 9 of the scavenging chamber 5 via the lead wire 21 along the coil spring 20 to the temperature measurement data. The data is transmitted to a data processing device (not shown) to perform predetermined processing. At the time of such measurement, the temperature measurement signal from the temperature sensor attached to the piston 3 is directly taken out via the lead wire 21 without the intervention of a radio device or the like. High-precision temperature measurement data can be obtained without noise. In addition, such an apparatus can increase the number of lead wire signal lines even if the number of temperature measurement points of the piston increases.
Multipoint measurement can be easily performed.

【0016】[0016]

【発明の効果】以上記載のごとく本発明によれば、ピス
トンの往復動によるストロ−ク変化に従がいコイルスプ
リングが伸縮することにより、該コイルスプリングとと
もにリ−ド線も撓むので、該リ−ド線は断線することな
く、上記温度センサからの温度計測信号を正確に伝送す
ることができる。また、ピストンに設けた温度計測信号
の送信側と掃気室内に設けた受信側とが離隔してなく、
温度計測信号は温度センサから直接リ−ド線に伝送され
るので、従来技術のような電気的ノイズの侵入は無く、
正確な計測デ−タが得られる。
As described above, according to the present invention, the coil spring expands and contracts according to the stroke change caused by the reciprocation of the piston, so that the lead wire is bent together with the coil spring. The temperature measurement signal from the temperature sensor can be accurately transmitted without breaking the ground wire. Also, the transmitting side of the temperature measurement signal provided on the piston and the receiving side provided in the scavenging chamber are not separated,
Since the temperature measurement signal is transmitted directly from the temperature sensor to the lead wire, there is no intrusion of electrical noise unlike the prior art.
Accurate measurement data can be obtained.

【0017】また温度センサからのリ−ド線をコイルス
プリングに沿わせて掃気室の引き出し部に導いているの
で、従来の技術に係るテレメ−タ発信器のような容量の
制限が無く、リ−ド線の信号線数を増加することにより
多点計測がきわめて容易にできる。これによりピストン
の温度分布が正確に測定できる。
Also, since the lead wire from the temperature sensor is guided along the coil spring to the draw-out portion of the scavenging chamber, there is no limitation on the capacity as in the telemeter transmitter according to the prior art. Multi-point measurement can be made extremely easy by increasing the number of signal lines. Thereby, the temperature distribution of the piston can be accurately measured.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態に係る大型ディ−ゼル機関の
ピストンの温度計測装置の全体構成図である。
FIG. 1 is an overall configuration diagram of a piston temperature measuring device of a large diesel engine according to an embodiment of the present invention.

【図2】従来技術に係るピストン温度計測装置の構成図
である。
FIG. 2 is a configuration diagram of a piston temperature measuring device according to the related art.

【符号の説明】[Explanation of symbols]

1 シリンダライナ 2 シリンダカバ− 3 ピストン 4 ピストン棒 5 掃気室 6 パッキン箱 7 隔壁 8 シリンダブロック 9 開口部 20 コイルスプリング 21 リ−ド線 DESCRIPTION OF SYMBOLS 1 Cylinder liner 2 Cylinder cover 3 Piston 4 Piston rod 5 Scavenging chamber 6 Packing box 7 Partition wall 8 Cylinder block 9 Opening 20 Coil spring 21 Lead wire

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ピストンの下部にピストン棒の上端を固
定し、該ピストン棒の下端をクロスヘッドに連結してな
るクロスヘッド式内燃機関において、 前記ピストン棒の外周にコイルスプリングを、廻り止め
した状態でピストン棒上端より掃気室側まで介装すると
ともに、前記ピストンの温度計測点から導出したリード
線を前記コイルスプリングに沿って掃気室へ導き、該掃
気室から外部に引き出すように構成したことを特徴とす
るピストンの温度計測装置。
1. A crosshead internal combustion engine in which an upper end of a piston rod is fixed to a lower part of a piston and a lower end of the piston rod is connected to a crosshead, wherein a coil spring is prevented from rotating around the outer periphery of the piston rod. In this state, the piston rod is interposed from the upper end of the piston rod to the scavenging chamber side, and a lead wire derived from the temperature measurement point of the piston is guided to the scavenging chamber along the coil spring and drawn out from the scavenging chamber. A piston temperature measuring device characterized by the above-mentioned.
JP11347697A 1997-04-15 1997-04-15 Temperature measuring device of piston Withdrawn JPH10288556A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11347697A JPH10288556A (en) 1997-04-15 1997-04-15 Temperature measuring device of piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11347697A JPH10288556A (en) 1997-04-15 1997-04-15 Temperature measuring device of piston

Publications (1)

Publication Number Publication Date
JPH10288556A true JPH10288556A (en) 1998-10-27

Family

ID=14613245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11347697A Withdrawn JPH10288556A (en) 1997-04-15 1997-04-15 Temperature measuring device of piston

Country Status (1)

Country Link
JP (1) JPH10288556A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389173A (en) * 2013-07-25 2013-11-13 南京络联测控技术有限公司 Temperature measuring rod
CN113153687A (en) * 2021-03-09 2021-07-23 西安交通大学 Piston temperature measuring system of liquid-driven piston compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389173A (en) * 2013-07-25 2013-11-13 南京络联测控技术有限公司 Temperature measuring rod
CN113153687A (en) * 2021-03-09 2021-07-23 西安交通大学 Piston temperature measuring system of liquid-driven piston compressor
CN113153687B (en) * 2021-03-09 2022-10-25 西安交通大学 Piston temperature measuring system of liquid-driven piston compressor

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