JPH0737106Y2 - Expansion device in refrigeration circuit - Google Patents
Expansion device in refrigeration circuitInfo
- Publication number
- JPH0737106Y2 JPH0737106Y2 JP1989067713U JP6771389U JPH0737106Y2 JP H0737106 Y2 JPH0737106 Y2 JP H0737106Y2 JP 1989067713 U JP1989067713 U JP 1989067713U JP 6771389 U JP6771389 U JP 6771389U JP H0737106 Y2 JPH0737106 Y2 JP H0737106Y2
- Authority
- JP
- Japan
- Prior art keywords
- expansion valve
- valve
- flow rate
- electronic expansion
- expansion device
- 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.)
- Expired - Lifetime
Links
- 238000005057 refrigeration Methods 0.000 title claims description 7
- 239000003507 refrigerant Substances 0.000 description 20
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Temperature-Responsive Valves (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は空気調和装置、ショーケースにおける冷凍機、
恒温機、恒温恒湿器等に使用される冷凍回路（冷凍装
置）における膨張装置に関する。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an air conditioner, a refrigerator in a showcase,
The present invention relates to an expansion device in a refrigeration circuit (refrigeration device) used for a thermostat, a thermostat, and a humidifier.
従来、この種の冷凍回路においては、膨張装置としてス
テッピングモータで弁開度を調節する電子膨張弁が広く
使用されている。2. Description of the Related Art Conventionally, in this type of refrigeration circuit, an electronic expansion valve that adjusts the valve opening degree by a stepping motor is widely used as an expansion device.
しかし、膨張装置として電子膨張弁を単独で採用する場
合、次のような問題がある。However, when the electronic expansion valve is independently used as the expansion device, there are the following problems.
小容量の冷凍機（200〜400W以下）を低い蒸発温度
（−40℃以下程度）で使用する場合、弁が全閉に近い付
近で弁開度を調節することになるが、電子膨張弁の特性
として、全閉に近い付近での弁開度の再現性は悪く、そ
のため蒸発温度の再現性も悪くなる。When using a small-capacity refrigerator (200 to 400 W or less) at a low evaporation temperature (about -40 ° C or less), the valve opening will be adjusted near the valve close to full closure. Characteristically, the reproducibility of the valve opening near the fully closed position is poor, and therefore the reproducibility of the evaporation temperature is also poor.
同じく小容量の冷凍機を低い蒸発温度で使用する場
合、第４図に示すように、膨張弁能力（冷媒流量）の上
限および下限間の幅Ｑに対して弁開度の変化量ｗが小さ
く、従って所望冷媒流量を精度よく再現できない。Similarly, when a small capacity refrigerator is used at a low evaporation temperature, as shown in FIG. 4, the variation w of the valve opening is small with respect to the width Q between the upper limit and the lower limit of the expansion valve capacity (refrigerant flow rate). Therefore, the desired refrigerant flow rate cannot be accurately reproduced.
第５図に示すように、冷媒流量分解能ａが悪い電子膨
張弁の場合には、冷凍機容量に関係なく、きめ細かく膨
張弁能力（冷媒流量）を変更することができない。As shown in FIG. 5, in the case of an electronic expansion valve having a poor refrigerant flow rate resolution a, the expansion valve capacity (refrigerant flow rate) cannot be finely changed regardless of the refrigerator capacity.
ノイズ信号等により電子膨張弁が全開したとき、冷凍
機に過大な負荷が急激に加わり、冷凍機の破損につなが
る。When the electronic expansion valve is fully opened due to a noise signal or the like, an excessive load is suddenly applied to the refrigerator, resulting in damage to the refrigerator.
そこで本考案は前述の問題点を解決した冷凍回路におけ
る膨張装置を提供することを目的とする。Therefore, an object of the present invention is to provide an expansion device in a refrigeration circuit that solves the above problems.
本考案は前記目的に従い、電子膨張弁に直列に絞り機構
を接続したことを特徴とする冷凍回路における膨張装置
を提供するものである。According to the above-mentioned object, the present invention provides an expansion device in a refrigeration circuit, characterized in that a throttle mechanism is connected in series with an electronic expansion valve.
本考案膨張装置によると、電子膨張弁に接続した絞り機
構の作用で電子膨張弁両端の冷媒圧力差が絞り機構両端
の冷媒圧力差分だけ小さくなり、電子膨張弁の開度変化
に対する該弁中の冷媒流量変化が緩やかになる。According to the expansion device of the present invention, due to the action of the throttle mechanism connected to the electronic expansion valve, the refrigerant pressure difference between both ends of the electronic expansion valve is reduced by the refrigerant pressure difference between both ends of the throttle mechanism. The refrigerant flow rate changes slowly.
以下、本考案の実施例を図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は一実施例である膨張装置を示しており、該膨張
装置は電子膨張弁１の下流側にキャピラリチューブ２を
直列に接続したものである。FIG. 1 shows an expansion device according to an embodiment, which is a device in which a capillary tube 2 is connected in series downstream of an electronic expansion valve 1.
このようにキャピラリチューブ２を付加したので、膨張
装置両端の冷媒圧力差P1は膨張弁１両端の冷媒圧力差P1
1にキャピラリチューブ２両端の冷媒圧力差P12を加えた
ものとなり（P1＝P11＋P12）、膨張弁１両端の冷媒圧力
差P11は、キャピラリチューブ２がないときの膨張装置
両端の圧力差P1よりキャピラリチューブ２両端の冷媒圧
力差P12分だけ小さくなっている。Since the capillary tube 2 is added in this manner, the refrigerant pressure difference P1 at both ends of the expansion device is equal to the refrigerant pressure difference P1 at both ends of the expansion valve 1.
It becomes 1 plus the refrigerant pressure difference P12 at both ends of the capillary tube (P1 = P11 + P12). 2 The refrigerant pressure difference between both ends is reduced by P12.
その結果、膨張弁１の開度−冷媒流量特性は第２図に示
すようになる。As a result, the opening degree-refrigerant flow rate characteristic of the expansion valve 1 becomes as shown in FIG.
第２図から判るように、弁１の開度下限MNは弁１の全閉
に近い部分（再現性に乏しい部分）ではなく、全閉に近
い部分よりも開いた、再現性のよい部分へ移行してい
る。また、弁１の能力可変幅Ｑに対する弁開度の幅Ｗが
キャピラリチューブ２のない場合の幅ｗよりも大きくな
っている。従って、キャピラリチューブ２の接続によ
り、蒸発温度の再現性が改善されているとともに、従来
電子膨張弁よりもきめ細かく弁能力を変更できる。As can be seen from FIG. 2, the lower limit MN of the opening of the valve 1 is not the part close to the fully closed position (the part having poor reproducibility) of the valve 1 but to the open part with better reproducibility than the part close to the fully closed position. It is transitioning. Further, the width W of the valve opening with respect to the variable capacity Q of the valve 1 is larger than the width w in the case where the capillary tube 2 is not provided. Therefore, by connecting the capillary tube 2, the reproducibility of the evaporation temperature is improved, and the valve capacity can be changed more finely than the conventional electronic expansion valve.
また、第３図に示すように、たとえ冷媒流量の分解能ａ
の悪い弁１を使用したとしても、キャピラリチューブ２
が接続されていない場合の最小分解能ａ（ライン１参
照）よりも本実施例における方（ラインl2参照）が最小
分解能ｂは向上している。Moreover, as shown in FIG.
Capillary tube 2 even if a bad valve 1 is used
The minimum resolution b in the present embodiment (see line 12) is higher than the minimum resolution a (see line 1) in the case where is not connected.
さらに、たとえ弁１がノイズ等により全開となっても、
第２図に示すように、最大流量Qmaxが減っているので、
冷凍機に与えるダメージが減少する。Furthermore, even if the valve 1 is fully opened due to noise or the like,
As shown in FIG. 2, since the maximum flow rate Qmax has decreased,
Damage to the refrigerator is reduced.
なお、前記実施例ではキャピラリチューブ２を弁１の下
流側に接続したが、弁１の上流側に接続してもよい。Although the capillary tube 2 is connected to the downstream side of the valve 1 in the above embodiment, it may be connected to the upstream side of the valve 1.
また、絞り機構には前記キャピラリチューブの他、手動
膨張弁等を採用することができる。In addition to the capillary tube, a manual expansion valve or the like can be used as the throttle mechanism.
本考案によると次の利点がある。 The present invention has the following advantages.
小容量の冷凍機を低い蒸発温度で使用する場合でも、
電子膨張弁の開度の再現性が従来よりも良い。Even when using a small capacity refrigerator at a low evaporation temperature,
The reproducibility of the opening of the electronic expansion valve is better than before.
同じく小容量の冷凍機を低い蒸発温度で使用する場
合、冷媒流量変更の上限および下限の幅に対して電子膨
張弁開度の変化幅が大きくとれ、それだけ所望冷媒流量
を精度よく再現できる。Similarly, when a small-capacity refrigerator is used at a low evaporation temperature, the change range of the electronic expansion valve opening can be widened with respect to the upper and lower limits of the refrigerant flow rate change, and the desired refrigerant flow rate can be accurately reproduced.
冷媒流量の分解能が悪い電子膨張弁を使用しても、従
来よりきめ細かく冷媒流量を変更できる。Even if an electronic expansion valve with poor resolution of the refrigerant flow rate is used, the refrigerant flow rate can be changed more finely than before.
さらにノイズ信号等により電子膨張弁が全開したとき
でも、電子膨張弁に直列に絞り機構を接続してあること
で従来に比べ冷凍機にかかる負荷が小さく、それだけ冷
凍機のダメージが減少する。Further, even when the electronic expansion valve is fully opened due to a noise signal or the like, the throttle mechanism is connected in series to the electronic expansion valve, so that the load applied to the refrigerator is smaller than in the conventional case, and the damage to the refrigerator is reduced accordingly.
第１図は本考案の一実施例の側面図、第２図は第１図に
示す膨張装置における膨張弁の冷媒流量変更可能幅と弁
開度幅の関係を示す図、第３図は前記電子膨張弁の冷媒
流量分解能を示す図である。第４図は従来電子膨張弁の
冷媒流量可変幅と弁開度との関係を示す図、第５図は従
来電子膨張弁の冷媒流量分解能を示す図である。 １……電子膨張弁 ２……キャピラリチューブFIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a view showing a relationship between a refrigerant flow rate changeable width of an expansion valve and a valve opening width in the expansion device shown in FIG. 1, and FIG. It is a figure which shows the refrigerant flow rate resolution of an electronic expansion valve. FIG. 4 is a diagram showing the relationship between the variable range of the refrigerant flow rate of the conventional electronic expansion valve and the valve opening degree, and FIG. 5 is a diagram showing the refrigerant flow rate resolution of the conventional electronic expansion valve. 1 ... Electronic expansion valve 2 ... Capillary tube
Claims (1)
とを特徴とする冷凍回路における膨張装置。1. An expansion device in a refrigeration circuit, comprising a throttle mechanism connected in series to an electronic expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989067713U JPH0737106Y2 (en) | 1989-06-09 | 1989-06-09 | Expansion device in refrigeration circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989067713U JPH0737106Y2 (en) | 1989-06-09 | 1989-06-09 | Expansion device in refrigeration circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH036261U JPH036261U (en) | 1991-01-22 |
| JPH0737106Y2 true JPH0737106Y2 (en) | 1995-08-23 |
Family
ID=31601530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989067713U Expired - Lifetime JPH0737106Y2 (en) | 1989-06-09 | 1989-06-09 | Expansion device in refrigeration circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737106Y2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760542A (en) * | 1980-09-29 | 1982-04-12 | Toshiba Corp | Information recording medium |
| JPS5814196Y2 (en) * | 1981-06-05 | 1983-03-19 | 有信精器工業株式会社 | Backlash regulation mechanism for automotive locking devices |
| JPS60122871A (en) * | 1983-12-05 | 1985-07-01 | 三菱電機株式会社 | Air conditioner |
-
1989
- 1989-06-09 JP JP1989067713U patent/JPH0737106Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH036261U (en) | 1991-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |