JP4033598B2 - Refrigeration equipment - Google Patents

Refrigeration equipment Download PDF

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Publication number
JP4033598B2
JP4033598B2 JP2000071618A JP2000071618A JP4033598B2 JP 4033598 B2 JP4033598 B2 JP 4033598B2 JP 2000071618 A JP2000071618 A JP 2000071618A JP 2000071618 A JP2000071618 A JP 2000071618A JP 4033598 B2 JP4033598 B2 JP 4033598B2
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Japan
Prior art keywords
refrigerant
orifice
diameter portion
refrigerant pipe
pipe
Prior art date
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Expired - Fee Related
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JP2000071618A
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Japanese (ja)
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JP2001255041A (en
Inventor
正一 須田
和広 日向野
孝夫 椎名
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Filing date
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Priority to JP2000071618A priority Critical patent/JP4033598B2/en
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  • Air Conditioning Control Device (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、冷凍機器をつなぐ冷媒管にオリフィスが配設された冷凍装置に関する。
【0002】
【従来の技術】
冷凍機器をつなぐ冷媒管にオリフィスを配設した冷凍装置が示されたものとして、特開平7−139837号公報がある。
この公報に示されている冷凍装置は、冷媒管に設けたダボで冷媒管内のオリフィスを固定している。
【0003】
オリフィスを配管内に設けるためには一方の冷媒管にオリフィスを挿入しその挿入部分に他方の冷媒管をロー付けして閉じた冷凍サイクルを形成している。
ここで、前記ロー材が2つの冷媒管の隙間に流れ込んで両冷媒管の隙間を密閉するのであるが、そのロー材が多すぎた場合は、ロー材がオリフィスにまで達し、オリフィスの冷媒通路を閉塞してしまうことが考えられる。
【0004】
ロー材でオリフィスの冷媒通路を閉塞してしまうと、冷媒が流れなく若しくは流れにくくなり、冷凍装置の所望の能力が発揮されなくなる。
【0005】
本発明は、オリフィスが組み込まれた配管の接続部にロー材が流れ込んでも、オリフィスの冷媒通路を閉鎖しにくくして、冷凍装置の所望の能力を発揮させることを目的としたものである。
【0006】
【課題を解決するための手段】
この目的を達成するために、請求項1記載の発明は、圧縮機、凝縮器、減圧器、蒸発器を冷媒管でつないで冷凍サイクルを形成すると共に、一方の冷媒管に他方の冷媒管を挿入してロー付けにて接続し、且つこの接続部に近接して配置され冷媒の流れを制御するオリフィスを設けた冷凍装置において、オリフィスは他方の冷媒管側に位置する小径部と一方の冷媒管側に内接される大径部とからなり、この小径部と大径部とで形成される溝で、一方並びに他方の冷媒管の隙間に流れ込んだロー材を溜まり込むようにしたものである。
【0007】
請求項1記載の発明では、一方並びに他方の冷媒管の隙間に流れ込んだロー材は、他方の冷媒管側に位置する小径部と一方の冷媒管側に内接される大径部とで形成される溝で、を溜まり込む。
【0009】
【発明の実施の形態】
以下、本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はマルチ型の空気調和機(冷凍装置)で、1台の室外ユニット2に対して複数台の室内ユニット3a、3b、…が冷媒管で並列につながれている。
【0010】
室外ユニット2において、4は能力可変型の圧縮機、5は定格(能力一定型)の圧縮機で並列につながれている。
【0011】
6は四方弁で、冷房運転時は実線状態に、暖房運転時は破線状態に夫々設定される。
【0012】
そして、圧縮機4,5から吐出された冷媒を冷房運転時は実線矢印状態に、暖房運転時は破線状態に流す。
【0013】
7は室外熱交換器で並列に配置されている。この室外熱交換器7は冷房運転時は凝縮器として、暖房運転時は蒸発器として夫々作用される。
8はレシーバタンクである。9はアキュムレータで、2つの圧縮機4,5の吸込管10がつながれている。
【0014】
一方、室内ユニット3aは、図2で示すような天井埋込タイプのものであり、後述する熱交換器や送風機が内蔵された機体11と、この機体11の下部に取り付けられ吸込口が形成された化粧パネル12とから構成されている。
【0015】
13は吐出口で、ダクトがつながれ、その先端は図示しない室内の天井や壁面に臨み、化粧パネルから吸い込まれた室内空気を機体内で調温してダクトを介して室内へ循環させる。
【0016】
図1に戻って、室内ユニット3aにおいて、14はストレーナ、15は電動式の膨張弁(減圧器)で、「電動弁」と呼ばれているものである。以下この電動式の膨張弁を電動弁と言う。
【0017】
この電動弁15の弁開度はこの電動弁に内蔵されたパルスモータによって制御され、480パルスで全開、0パルスで全閉となるものである。この電動弁の弁開度については後述する。
【0018】
16はオリフィス(後述する)、17はストレーナ18が組み込まれた分流器、19は室内熱交換器で、冷房運転時に蒸発器として、暖房運転時に凝縮器として夫々作用される。20は集合管である。
【0019】
図3はオリフィス16が組み込まれた配管の断面図で、 一方の冷媒管21にはオリフィス16と、その出口側には冷媒音を少なくするための網22とが配置されている。
【0020】
23は他方の冷媒管で、一方の冷媒管21の内径とほぼ同一の外径を有し、一方の冷媒管21に挿入されてそのつなぎ部分をロー材24にてロー付けする。
【0021】
ここで、前記オリフィス16は、その形状が図4で示すように、他方の冷媒管23側に位置する小径部と一方の冷媒管21側に内接される大径部とからなり、この小径部と大径部とで溝25が形成されている。従って、前述した網22は、ロー付け側の部分の反対側に配置されていることとなる。
【0022】
このように、オリフィス16のロー付け側となる部分には、その全周にオリフィス16の小径部と大径部とで形成される溝25を設けたので、例えばロー材24が両冷媒管21、23の隙間26を介してオリフィス16に流れ込んだとしても、そのロー材24は溝25に溜まり込み、オリフィス16の冷媒通路27を塞ぐことは少ない。
【0023】
他の室内ユニット3b…内の機器においては、この室内ユニット3aの機器と同一であるため略同一符号を付してその説明は省略する。
【0024】
このような構成を備えたマルチ型の空気調和機1において、室内ユニット3a,3b…全てを暖房運転させる場合は、夫々の室内ユニット3a,3b…の電動弁15を、その室内ユニットの暖房負荷に応じた開度に設定する。
【0025】
一方、室外ユニット2においては各室内ユニットの暖房負荷の合計値に基づいて2つの圧縮機4,5の運転状態が制御される。このように室内ユニット3a,3b…の暖房負荷に応じて室外ユニット2の運転状態は制御される。
【0026】
ここで、例えば一つの室内ユニット3aのみ暖房負荷が「0」となった場合(他の室内ユニット3b…の暖房負荷は「0」でない)、この一つの室内ユニット3aの暖房運転は停止される。
【0027】
具体的には、図示しない室内送風機の運転を停止すると共に、電動弁15のパルスモータを室内熱交換器19に液冷媒が溜まり込まないようにように極少パルス(例えば70から80パルス)に可変設定される。この70から80パルスとは約14から16%(70から80/480)程度の弁開度である。
【0028】
因みに通常暖房時は凝縮器の過冷却をある一定量とするようにパルス設定(例えば115パルス)に設定され、その弁開度は約23%(115/480)程度である。すなわち、この暖房運転停止時における電動弁14aの弁開度は暖房運転時の弁開度よりも小さく設定されている。
【0029】
このように暖房運転停止中であっても電動弁14aを多少開きぎみに設定するのは、暖房運転停止中の室内ユニット3aの室内熱交換器19に凝縮冷媒が溜り込んだとしても、この溜り込んだ冷媒はオリフィス16や電動弁15を介して室外ユニット2へ戻すためである。ここである機種によれば凝縮冷媒が溜り込もうとする量は、実験的に0.3リットル〜0.4リットル程度であった。
【0030】
言い換えれば、室内ユニット3aの暖房運転停止中に室内熱交換器19で凝縮した冷媒は、オリフィス16や電動弁15を介して室外ユニット2へ戻り、冷媒が暖房運転停止中の室内ユニット3aに溜まり込まないようにしている。
【0031】
これによって、冷媒不足(ガス欠)が起こりにくくなり、充分な暖房能力が得られる。このオリフィス16は、図3で示すように2つの冷媒管21、23の隙間26に侵入したロー材24が受けられる溝25を設けたので、冷媒通路27がこのロー材24で詰まることは少なく、設計通りの冷媒通路27の寸法が保たれるので、オリフィス16付近から発生する冷媒音を極めて少なく抑えることができる。
【0032】
尚、冷房運転時は、このオリフィス16付近の冷媒の状態が液状であるため、暖房運転時ほど、その冷媒音が気にならない。
【0033】
上記実施例においては、室内ユニット3aは、図2で示すような天井埋込タイプのものであったが、本発明はこれに限定されるものではなく、いわゆる「4方向カセット」「2方向カセット」「高天井タイプ」「ビルトインタイプ」「壁掛タイプ」「天井吊り下げタイプ」等種々の室内ユニットに適用可能である。
【0034】
【発明の効果】
以上述べたように、圧縮機、凝縮器、減圧器、蒸発器を冷媒管でつないで冷凍サイクルを形成すると共に、一方の冷媒管に他方の冷媒管を挿入してロー付けにて接続し、且つこの接続部に近接して配置され冷媒の流れを制御するオリフィスを設けた冷凍装置において、オリフィスは他方の冷媒管側に位置する小径部と一方の冷媒管側に内接される大径部とからなり、この小径部と大径部とで形成される溝で、一方並びに他方の冷媒管の隙間に流れ込んだロー材を溜まり込むようにしたものである。
【0035】
従って、配管接続用に配管内に流れ込んだロー材は、オリフィスの小径部と大径部とで形成される溝に導かれオリフィスの冷媒通がロー材で閉塞されにくくなり、設計通りの冷媒通路の寸法が保たれ、オリフィス付近から発生する冷媒音を極めて少なく抑えることができる。
【図面の簡単な説明】
【図1】本発明の冷凍装置の冷媒回路図である。
【図2】図1に示した室内ユニットの外観を示す側面図である。
【図3】図1に示したオリフィスの断面図である。
【図4】上記オリフィスの斜視図である。
【符号の説明】
4,5 圧縮機
7 室外熱交換器
15 電動弁
16 オリフィス
19 室内熱交換器
21 一方の冷媒管
22 網
23 他方の冷媒管
25 溝
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigeration apparatus in which an orifice is provided in a refrigerant pipe connecting refrigeration equipment.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 7-139837 discloses a refrigeration apparatus in which an orifice is provided in a refrigerant pipe connecting refrigeration equipment.
In the refrigeration apparatus disclosed in this publication, an orifice in the refrigerant pipe is fixed by a dowel provided in the refrigerant pipe.
[0003]
In order to provide the orifice in the pipe, an orifice is inserted into one refrigerant pipe, and the other refrigerant pipe is brazed to the insertion portion to form a closed refrigeration cycle.
Here, the brazing material flows into the gap between the two refrigerant pipes and seals the gap between the two refrigerant pipes. If there is too much brazing material, the brazing material reaches the orifice, and the refrigerant passage of the orifice It is conceivable to block.
[0004]
If the refrigerant passage of the orifice is blocked with the raw material, the refrigerant does not flow or is difficult to flow, and the desired capacity of the refrigeration apparatus cannot be exhibited.
[0005]
An object of the present invention is to make it difficult to close a refrigerant passage of an orifice even when a brazing material flows into a connection portion of a pipe in which an orifice is incorporated, thereby exerting a desired capacity of a refrigeration apparatus.
[0006]
[Means for Solving the Problems]
In order to achieve this object, according to the first aspect of the present invention, a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant pipe to form a refrigeration cycle, and one refrigerant pipe is connected to the other refrigerant pipe. In a refrigerating apparatus that is inserted and connected by brazing, and provided with an orifice that is arranged in the vicinity of the connecting portion and controls the flow of the refrigerant, the orifice is a small-diameter portion located on the other refrigerant tube side and one refrigerant It consists of a large-diameter portion that is inscribed on the pipe side, and a groove formed by the small-diameter portion and the large-diameter portion is used to collect the brazing material that flows into the gap between one and the other refrigerant tubes. is there.
[0007]
In the first aspect of the present invention, the brazing material that has flowed into the gap between the one and the other refrigerant pipes is formed by a small diameter portion located on the other refrigerant pipe side and a large diameter portion inscribed on the one refrigerant pipe side. In the groove to be accumulated, accumulate.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a multi-type air conditioner (refrigeration device), in which a plurality of indoor units 3 a, 3 b,...
[0010]
In the outdoor unit 2, 4 is a variable capacity compressor, and 5 is a rated (constant capacity) compressor connected in parallel.
[0011]
6 is a four-way valve, which is set to a solid line state during the cooling operation and set to a broken line state during the heating operation.
[0012]
Then, the refrigerant discharged from the compressors 4 and 5 flows in the solid arrow state during the cooling operation, and in the broken line state during the heating operation.
[0013]
7 is an outdoor heat exchanger arranged in parallel. The outdoor heat exchanger 7 acts as a condenser during the cooling operation and as an evaporator during the heating operation.
Reference numeral 8 denotes a receiver tank. An accumulator 9 is connected to the suction pipes 10 of the two compressors 4 and 5.
[0014]
On the other hand, the indoor unit 3a is of a ceiling-embedded type as shown in FIG. 2, and has a body 11 in which a heat exchanger and a blower to be described later are incorporated, and a suction port that is attached to the lower portion of the body 11 is formed. And a decorative panel 12.
[0015]
A discharge port 13 is connected to a duct, and a tip of the duct faces a ceiling or wall surface of a room (not shown). The room air sucked from the decorative panel is conditioned in the body and circulated into the room through the duct.
[0016]
Returning to FIG. 1, in the indoor unit 3 a, 14 is a strainer, and 15 is an electric expansion valve (pressure reducer), which is called an “electric valve”. Hereinafter, this electric expansion valve is referred to as an electric valve.
[0017]
The valve opening degree of the motor-operated valve 15 is controlled by a pulse motor built in the motor-operated valve, and is fully opened with 480 pulses and fully closed with 0 pulses. The valve opening degree of this electric valve will be described later.
[0018]
Reference numeral 16 denotes an orifice (described later), 17 is a flow divider incorporating a strainer 18, and 19 is an indoor heat exchanger that acts as an evaporator during cooling operation and as a condenser during heating operation. Reference numeral 20 denotes a collecting pipe.
[0019]
FIG. 3 is a cross-sectional view of a pipe into which the orifice 16 is incorporated. One refrigerant pipe 21 is provided with an orifice 16 and a net 22 for reducing refrigerant noise at the outlet side thereof.
[0020]
The other refrigerant pipe 23 has an outer diameter substantially the same as the inner diameter of one refrigerant pipe 21, and is inserted into one refrigerant pipe 21 and brazed with a brazing material 24.
[0021]
Here, as shown in FIG. 4, the orifice 16 is composed of a small diameter portion located on the other refrigerant tube 23 side and a large diameter portion inscribed on the one refrigerant tube 21 side. A groove 25 is formed by the portion and the large diameter portion. Therefore, the above-described net 22 is arranged on the opposite side of the brazing side portion.
[0022]
As described above, since the groove 25 formed by the small diameter portion and the large diameter portion of the orifice 16 is provided on the entire circumference of the portion on the brazing side of the orifice 16, for example, the brazing material 24 is used for both refrigerant pipes 21. , 23, the brazing material 24 collects in the groove 25 and hardly blocks the refrigerant passage 27 of the orifice 16.
[0023]
Since the devices in the other indoor units 3b are the same as the devices in the indoor unit 3a, the same reference numerals are given and the description thereof is omitted.
[0024]
In the multi-type air conditioner 1 having such a configuration, when all the indoor units 3a, 3b... Are operated for heating, the electric valves 15 of the respective indoor units 3a, 3b. Set the opening according to.
[0025]
On the other hand, in the outdoor unit 2, the operating states of the two compressors 4 and 5 are controlled based on the total heating load of each indoor unit. Thus, the operation state of the outdoor unit 2 is controlled according to the heating load of the indoor units 3a, 3b.
[0026]
Here, for example, when the heating load of only one indoor unit 3a becomes “0” (the heating load of the other indoor units 3b... Is not “0”), the heating operation of this one indoor unit 3a is stopped. .
[0027]
Specifically, the operation of the indoor blower (not shown) is stopped, and the pulse motor of the motor-operated valve 15 is variable to a minimum pulse (for example, 70 to 80 pulses) so that liquid refrigerant does not accumulate in the indoor heat exchanger 19. Is set. These 70 to 80 pulses are about 14 to 16% (70 to 80/480) of valve opening.
[0028]
Incidentally, during normal heating, the pulse setting (for example, 115 pulses) is set so that the condenser subcooling is a certain amount, and the valve opening is about 23% (115/480). That is, the valve opening degree of the electric valve 14a when the heating operation is stopped is set smaller than the valve opening degree during the heating operation.
[0029]
Thus, even when the heating operation is stopped, the motor-operated valve 14a is set slightly open even if the condensed refrigerant has accumulated in the indoor heat exchanger 19 of the indoor unit 3a during the heating operation stop. This is because the introduced refrigerant returns to the outdoor unit 2 through the orifice 16 and the motor-operated valve 15. According to this model, the amount of the condensed refrigerant that has accumulated is experimentally about 0.3 to 0.4 liter.
[0030]
In other words, the refrigerant condensed in the indoor heat exchanger 19 while the heating operation of the indoor unit 3a is stopped returns to the outdoor unit 2 through the orifice 16 and the electric valve 15, and the refrigerant accumulates in the indoor unit 3a where the heating operation is stopped. I try not to put it in.
[0031]
As a result, refrigerant shortage (gas shortage) is less likely to occur, and sufficient heating capacity is obtained. Since the orifice 16 is provided with a groove 25 for receiving the brazing material 24 that has entered the gap 26 between the two refrigerant pipes 21 and 23 as shown in FIG. 3, the refrigerant passage 27 is less likely to be clogged with the brazing material 24. Since the dimension of the refrigerant passage 27 as designed is maintained, the refrigerant noise generated from the vicinity of the orifice 16 can be suppressed to an extremely low level.
[0032]
During the cooling operation, the state of the refrigerant in the vicinity of the orifice 16 is in a liquid state, so that the refrigerant noise is less noticeable than during the heating operation.
[0033]
In the above embodiment, the indoor unit 3a is a ceiling-embedded type as shown in FIG. 2, but the present invention is not limited to this, and a so-called "4-way cassette", "2-way cassette" It can be applied to various indoor units such as “high ceiling type”, “built-in type”, “wall hanging type”, “ceiling hanging type”.
[0034]
【The invention's effect】
As described above, a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant pipe to form a refrigeration cycle, and the other refrigerant pipe is inserted into one refrigerant pipe and connected by brazing, Further, in the refrigeration apparatus provided with an orifice that is arranged in the vicinity of the connecting portion and controls the flow of the refrigerant, the orifice is a small-diameter portion located on the other refrigerant tube side and a large-diameter portion inscribed on the one refrigerant tube side. In the groove formed by the small-diameter portion and the large-diameter portion, the brazing material that has flowed into the gap between one and the other refrigerant pipe is accumulated.
[0035]
Therefore, the brazing material that has flowed into the piping for pipe connection is guided to the groove formed by the small diameter portion and the large diameter portion of the orifice, so that the refrigerant passage of the orifice is not easily blocked by the brazing material, and the refrigerant passage as designed Thus, the refrigerant noise generated from the vicinity of the orifice can be suppressed to a very low level.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus of the present invention.
FIG. 2 is a side view showing an appearance of the indoor unit shown in FIG.
3 is a cross-sectional view of the orifice shown in FIG.
FIG. 4 is a perspective view of the orifice.
[Explanation of symbols]
4, 5 Compressor 7 Outdoor heat exchanger 15 Motorized valve 16 Orifice 19 Indoor heat exchanger 21 One refrigerant pipe 22 Net 23 Other refrigerant pipe 25 Groove

Claims (1)

圧縮機、凝縮器、減圧器、蒸発器を冷媒管でつないで冷凍サイクルを形成すると共に、一方の冷媒管に他方の冷媒管を挿入してロー付けにて接続し、且つこの接続部に近接して配置され冷媒の流れを制御するオリフィスを設けた冷凍装置において、前記オリフィスは他方の冷媒管側に位置する小径部と一方の冷媒管側に内接される大径部とからなり、この小径部と大径部とで形成される溝で、一方並びに他方の冷媒管の隙間に流れ込んだロー材を溜まり込むようにしたことを特徴とする冷凍装置。A compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant pipe to form a refrigeration cycle, and the other refrigerant pipe is inserted into one refrigerant pipe and connected by brazing, and close to this connection portion. In the refrigeration apparatus provided with an orifice for controlling the flow of the refrigerant, the orifice includes a small diameter portion located on the other refrigerant tube side and a large diameter portion inscribed on the one refrigerant tube side. A refrigerating apparatus characterized in that a brazing material flowing into a gap between one and the other refrigerant pipe is accumulated in a groove formed by a small diameter portion and a large diameter portion .
JP2000071618A 2000-03-15 2000-03-15 Refrigeration equipment Expired - Fee Related JP4033598B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112222863A (en) * 2020-12-15 2021-01-15 佛山市顺德区凯硕精密模具自动化科技有限公司 Intelligent welding production line of compressor robot

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097865A (en) * 2001-09-25 2003-04-03 Daikin Ind Ltd Air conditioner
JP4114457B2 (en) * 2002-10-11 2008-07-09 ダイキン工業株式会社 Shut-off valve and air conditioner
DE10258453B4 (en) * 2002-12-13 2007-11-15 Otto Egelhof Gmbh & Co. Kg Circulation for the production of cold or heat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112222863A (en) * 2020-12-15 2021-01-15 佛山市顺德区凯硕精密模具自动化科技有限公司 Intelligent welding production line of compressor robot
CN112222863B (en) * 2020-12-15 2021-04-16 佛山市顺德区凯硕精密模具自动化科技有限公司 Intelligent welding production line of compressor robot

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