冷凍システムの5つの一般的な問題
まず、不十分な冷媒の処理
1.故障現象：マシン全体の冷却効果が低く、水出口が少しだけ冷たく、高圧-圧力側と低圧-圧力側の圧力がマニホールド圧力計で低くなります（コンプレッサーの通常の速度の下で、周囲温度が約35℃のとき、低圧メーターインデックスは1kg / cm2より低く、高い-圧力メーターインデックスは低くなります10kg / cm2以上）、そして覗き窓から気泡の流れが見えます。
2. The cause of the failure: the refrigeration system has a refrigerant leakage point, which results in insufficient refrigerant.
3. Treatment method: 1). Use electronic leak detector to find the leak point and repair or replace parts.
2). If the parts are not replaced, only the appropriate amount of refrigerant can be added; if the parts are replaced, the appropriate amount of refrigeration oil should be added as required, and the refrigerant should be added after the system is evacuated.
第二に、冷媒の過給
1. Failure phenomenon:
冷却効果が低く、マニホールド圧力計で確認したところ、高圧-低圧側と低圧-側の圧力が高すぎる（コンプレッサーの速度が正常で周囲温度の場合）は35°Cで、高い-圧力計の圧力は約19 kg / cm2で、低い-圧力計の圧力は2.3 kg / cm2であり、覗き窓に気泡は見えません。
2. Failure reason: Too much refrigerant is added in the refrigeration system, so that the refrigeration capacity cannot be fully exerted, resulting in poor refrigeration effect.
3. Treatment method: Connect the manifold pressure gauge to the system, and slowly loosen the manual valve on the low pressure side of the manifold pressure gauge, so that the refrigerant is slowly discharged (cannot be discharged from the high pressure side, because the refrigerant will be taken out from the high pressure side) A large amount of freezing oil) until the pressure on the high and low sides is normal, and the refrigerant flows clearly from the sight glass, and occasionally bubbles flow through.
第三に、冷却システムは空気と混合されています
1.故障現象：マシン全体の冷却能力が低下します。マニホールド圧力計を確認したところ、高圧側の圧力が高く、低圧側の圧力が正常値より高い場合があります（コンプレッサーの回転数は正常で、周囲温度は35℃です）このとき、高圧側{2}の圧力は20kg / cm2より高く、高圧側{2} {2}の指針が振動している一方、気泡が多く流れているのが見えるサイトグラスから。
2. Reasons for failure:
システム内に空気が混入しています。主に組み立てまたはオーバーホールの後、真空は完全ではありません。冷媒を充填するとき、または冷凍オイルを追加するとき、空気はシステムに導入されます。またはシステムが負圧下で動作しているとき、空気は狭い場所で混合されます。冷媒は空気中に入ると一定の圧力になり、冷媒も一定の圧力になります。密閉容器内では、ガス圧の合計は分圧の合計に等しいため、高圧力ゲージと低圧力ゲージの読み取り値が通常より高くなります。
3. Treatment method: 1) Release refrigerant (release slowly from low pressure side with pressure gauge). 2) Check the cleanliness of the compressor oil. 3) Refill the refrigerant after vacuuming.
Fourth, & quot;ice blockage & quot; appears in the refrigeration system
1. Failure phenomenon: The refrigeration system periodically cools suddenly but not suddenly. During operation, the pointer on the low pressure side of the manifold pressure gauge often fluctuates between the negative pressure and the normal value.
2. Cause of failure: Moisture is mixed into the refrigerant in the refrigeration system. Because the water is incompatible with the refrigerant, when the refrigerant flows through the orifice of the expansion valve, the temperature drops suddenly. These are mixed in the refrigerant The water will easily form small particles of ice in the vicinity of the small hole of the throttle valve or around the valve pin hole, which is spherical or hemispherical. When the ice particles are condensed to a certain extent, the throttle channel is blocked and an ice jam fault is formed. . When ice blocking occurs due to icing, the refrigeration system cannot work properly, and the refrigeration effect is significantly reduced, even without refrigeration.
この時、低圧計は負圧になっているので、氷塊の温度が明らかに上昇し、氷塊の氷粒子が水に溶けて、氷塊現象が消え、冷凍システムが通常運転を再開し、冷蔵は良好で低圧側の圧力は正常に戻りました。しばらくすると、システムに氷の閉塞があり、システムは正常に動作していませんでした。
3. Treatment method: 1) Because the desiccant is in supersaturated state, it is necessary to replace the reservoir with desiccant and add 30ml of freezing oil. 2) Vacuum the system and add a specified amount of refrigerant.
第5の汚れた閉塞のトラブルシューティング
1. Failure phenomenon: poor cooling effect or no cooling. When the air conditioning system is running, the readings of the high and low pressure gauges on the manifold pressure gauge are less than the normal value. (When the compressor speed is normal and the ambient temperature is around 35 ° C, the pressure on the high pressure gauge side is less than 9 kg / cm2, and the pressure on the low pressure side is Negative pressure), and there is frost or dew on the filter and capillary tube.
2. The cause of the failure: the dust in the refrigeration system adheres or adheres to the filter screen at the inlet end of the filter, or the interface between the capillary and the filter screen, so that a local throttling phenomenon is formed at this location, and the temperature drops rapidly, and condensation or condensation occurs Frost.
3. Treatment method: If there is frosting at the filter inlet, and the sound of intermittent airflow is heard, tap the filter body with a small wrench, the airflow sound changes, and the frost layer of the filter and capillary melts at the same time, which can be judged The filter inlet filter is clogged.
このとき：①キャピラリーを外し、フィルターを掃除してブロードライし、再度取り付けます。またはフィルター②を交換し、真空引きして冷媒を規定量充填します。
