行业组件数据 · 2026

感温包

繁體:感溫包

感温包是制冷和空调系统中热力膨胀阀(TXV)的关键部件,通过毛细管与阀膜片相连,安装在蒸发器出口,感应制冷剂蒸气的过热度,调节阀门开度以控制制冷剂流量。

技术定义与适配语境
典型 感温包 会按材料、尺寸公差、适配关系和失效风险在 机械和设备制造 中评估。

感温包是制冷和空调系统中热力膨胀阀(TXV)的关键部件。它由一个密封的球泡组成,内部充注对温度敏感的流体(通常是与系统相同的制冷剂或特殊气体充注),通过毛细管与阀膜片相连。感温包安装在蒸发器出口,感应离开蒸发器的制冷剂蒸气的过热度。随着温度变化,感温包内部压力发生变化,通过毛细管传递力来调节阀门开度,从而精确控制制冷剂流量,以维持最佳过热度并提高系统效率。 感温包的工作原理基于热膨胀和压力传递。当蒸发器出口温度升高时,感温包内的流体膨胀,毛细管和膜片组件中的压力增加。该压力克服弹簧力,使膨胀阀开启,允许更多制冷剂流过。相反,当温度降低时,压力下降,导致阀门关闭并减少流量。这种反馈机制通过使制冷剂流量与蒸发器的冷却负荷相匹配,维持恒定的过热度。

组件规格

定义
感温包是制冷和空调系统中热力膨胀阀(TXV)的关键部件。它由一个密封的球泡组成,内部充注对温度敏感的流体(通常是与系统相同的制冷剂或特殊气体充注),通过毛细管与阀膜片相连。感温包安装在蒸发器出口,感应离开蒸发器的制冷剂蒸气的过热度。随着温度变化,感温包内部压力发生变化,通过毛细管传递力来调节阀门开度,从而精确控制制冷剂流量,以维持最佳过热度并提高系统效率。

感温包的工作原理基于热膨胀和压力传递。当蒸发器出口温度升高时,感温包内的流体膨胀,毛细管和膜片组件中的压力增加。该压力克服弹簧力,使膨胀阀开启,允许更多制冷剂流过。相反,当温度降低时,压力下降,导致阀门关闭并减少流量。这种反馈机制通过使制冷剂流量与蒸发器的冷却负荷相匹配,维持恒定的过热度。
工作原理
The thermal bulb operates on the principle of thermal expansion and pressure transmission. When the temperature at the evaporator outlet increases, the fluid inside the bulb expands, increasing pressure in the capillary tube and diaphragm assembly. This pressure acts against a spring force to open the expansion valve, allowing more refrigerant flow. Conversely, when temperature decreases, pressure drops, causing the valve to close and reduce flow. This feedback mechanism maintains constant superheat by matching refrigerant flow to the evaporator's cooling load.
材料
感温包和毛细管通常由铜或不锈钢制成因其具有优异的热传导性和耐腐蚀性。感温包内充注与系统制冷剂类型(如R134a、R410A)相匹配的温度敏感流体或特殊气体充注。密封件采用与制冷剂相容的丁腈橡胶或氟橡胶弹性体。
Bulb Diameter
6-12 mm
Response Time
< 30 seconds
Pressure Range
0-30 bar
Superheat Setting
Typically 4-8K adjustable
Temperature Range
-40°C to +100°C
Capillary Tube Length
0.5-2 meters
标准
ISO 5149DIN 8977

行业分类与别名

感温包 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Physical damage to capillary tube during installation or maintenance->Loss of thermal bulb charge leading to expansion valve malfunction->Use protective sleeves during installation, follow proper handling procedures, and implement visual inspection protocols
Incorrect bulb positioning or poor thermal contact->Inaccurate superheat sensing causing improper refrigerant flow regulation->Follow manufacturer installation guidelines precisely, use proper mounting clamps, and verify installation during commissioning
Incompatible refrigerant charge in thermal bulb->Expansion valve operates outside designed parameters causing system inefficiency->Verify thermal bulb specifications match system refrigerant type during component selection and replacement

工业生态与工程逻辑

0
Charge loss due to leakage
1
Improper installation affecting sensing accuracy
2
Capillary tube damage during handling
3
Incompatible refrigerant charge causing improper operation
4
Bulb insulation failure leading to false readings

合规与检测

tolerance
Temperature sensing accuracy: ±1K within operating range; Pressure transmission: ±5% of full scale
test method
ISO 1998:2017 for refrigerant compatibility testing; Pressure decay test per ISO 15848 for leakage verification; Thermal response testing in controlled temperature baths

制造该组件的工厂

来自 CNFX 组件能力表的相关制造商资料。

制造商列表用于前期研究和供应商能力理解,不代表认证、排名或交易担保。

采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the purpose of the thermal bulb in an expansion valve?

The thermal bulb senses the temperature of refrigerant vapor leaving the evaporator and modulates the expansion valve opening to maintain proper superheat, ensuring efficient system operation and preventing liquid refrigerant from returning to the compressor.

How do you install a thermal bulb correctly?

Install the bulb securely on a clean, straight section of the suction line at the evaporator outlet, insulated from ambient air. It should be mounted horizontally or vertically with the capillary tube pointing downward, using proper clamps to ensure good thermal contact without damaging the tube.

What happens if the thermal bulb loses its charge?

If the thermal bulb loses its charge due to leakage or damage, it cannot generate proper pressure to operate the expansion valve. This typically causes the valve to either remain fully closed (starving the evaporator) or fully open (flooding the evaporator), leading to system inefficiency, compressor damage, or complete system failure.

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CNFX Industrial Component Index · 机械和设备制造

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