CN213402436U - Constant temperature system liquid level protection circuit - Google Patents
Constant temperature system liquid level protection circuit Download PDFInfo
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- CN213402436U CN213402436U CN202022568450.4U CN202022568450U CN213402436U CN 213402436 U CN213402436 U CN 213402436U CN 202022568450 U CN202022568450 U CN 202022568450U CN 213402436 U CN213402436 U CN 213402436U
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- liquid level
- water tank
- constant temperature
- alarm node
- compressor
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Abstract
Constant temperature system liquid level protection circuit. Because the small-size compressor generally does not dispose perfect protection, if the water break in the cooling water tank will cause the compressor serious frosting, lead to refrigerant pipeline, heat exchange tube frost crack and compressor damage, cause great economic loss. The utility model discloses the constitution includes: the system comprises a compressor control loop (4) and a liquid level control loop (2) connected in parallel in a constant temperature system loop (1), wherein the liquid level control loop comprises a water tank low liquid level alarm node (5), a water tank high liquid level alarm node (6) and an intermediate relay; the water tank low liquid level alarm node, the water tank high liquid level alarm node and the intermediate relay coil (7) are connected in series, a normally open contact of the intermediate relay is connected in parallel at two ends of the water tank high liquid level alarm node, and another normally open contact (3) of the intermediate relay is connected in series in the compressor control loop. The utility model discloses with constant temperature system liquid level protection circuit.
Description
Technical Field
The utility model relates to a constant temperature system liquid level protection circuit.
Background
Thermal power plants are typically provided with steam-water sampling analysis systems to achieve continuous sampling, analysis, monitoring and recording of the steam-water system. Every set of soda sampling system includes high temperature sample frame and low temperature sample frame low temperature frame, wherein every set of low temperature sample frame respectively sets up one set of constant temperature system (containing coolant tank, the compressor, the heat exchange tube, the cold water pump, moisturizing ball valve etc.), guarantee to get into the water sample temperature of chemical instrumentation and be in 24-26 ℃, the supporting compressor of constant temperature system adopts freon as refrigerant medium, because small-size compressor does not generally dispose perfect protection, if the water cut-off will cause the compressor serious frosting in the coolant tank, lead to the refrigerant pipeline, the heat exchange tube frost crack and the compressor damage, cause great economic loss.
Disclosure of Invention
The utility model aims at solving the small-size compressor and generally not configuring perfect protection, if the water-break will cause the compressor to seriously frost in the cooling water tank, lead to refrigerant pipeline, heat exchange tube frost crack and compressor to damage, cause great economic loss's problem, provide one kind and prevent that the water tank from starting the compressor under anhydrous or the water-break circumstances to the constant temperature system liquid level protection circuit of low temperature sample frame constant temperature system reliability has been improved.
The above purpose is realized by the following technical scheme:
a constant temperature system liquid level protection circuit comprises a compressor control loop and a liquid level control loop connected in parallel in a constant temperature system loop, wherein the liquid level control loop comprises a water tank low liquid level alarm node, a water tank high liquid level alarm node and an intermediate relay;
the water tank low liquid level alarm node, the water tank high liquid level alarm node and the intermediate relay coil are connected in series, a normally open contact of the intermediate relay is connected in parallel at two ends of the water tank high liquid level alarm node, and another normally open contact of the intermediate relay is connected in series in the compressor control loop.
The constant temperature system liquid level protection circuit, the low liquid level warning node of water tank and the high liquid level warning node of water tank all be normally open contact.
Has the advantages that:
1. the utility model discloses install liquid level protection device additional at constant temperature system cooling water tank, start through liquid level interlocking loop shutting compressor, prevent that the water tank from starting the compressor under anhydrous or the disconnected water condition to the low temperature sample frame constant temperature system reliability has been improved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of the liquid level control circuit;
in the figure: 1. a constant temperature system loop; 2. a liquid level control loop; 3. a normally open contact; 4. a compressor control loop; 5. a water tank low level alarm node; 6. a water tank high level alarm node; 7. an intermediate relay coil.
The specific implementation mode is as follows:
example 1:
a constant temperature system liquid level protection circuit comprises a compressor control loop 4 and a liquid level control loop 2 connected in parallel in a constant temperature system loop 1, wherein the liquid level control loop comprises a water tank low liquid level alarm node 5, a water tank high liquid level alarm node 6 and an intermediate relay;
the water tank low liquid level alarm node, the water tank high liquid level alarm node and the intermediate relay coil 7 are connected in series, a normally open contact of the intermediate relay is connected in parallel at two ends of the water tank high liquid level alarm node, and another normally open contact 3 of the intermediate relay is connected in series in the compressor control loop.
Example 2:
according to the constant temperature system liquid level protection circuit of embodiment 1, the water tank low liquid level alarm node and the water tank high liquid level alarm node are both normally open contacts.
The liquid level measuring device is provided with high (H node) and low liquid level (L node) alarm nodes, normally open nodes are selected, the high and low liquid level alarm nodes are connected into an electric control loop of a compressor of the thermostatic device, a liquid level interlocking protection loop is added in the electric control loop, when the liquid level of a cooling water tank is higher than the high liquid level alarm node, the liquid level meter H, L alarm nodes are closed, an intermediate relay KA acts, an auxiliary contact KA is closed, the compressor is allowed to start, when the liquid level of the cooling water tank falls between the high and low alarm liquid levels, the liquid level meter H alarm node is disconnected, the L alarm node is still closed, due to the self-locking function of the intermediate relay KA auxiliary node, the intermediate relay KA is still electrified, the compressor can still continue to operate, when the liquid level of the cooling water tank falls below the low alarm liquid level, the liquid level meter H, L alarm nodes are disconnected, and the intermediate, the compressor is tripped. Through two liquid level node blocking circuit, tripping operation compressor when can guarantee the water tank low liquid level again can avoid the water level near the undulant compressor of frequently opening and stop near low liquid level to cause the compressor damage.
Claims (2)
1. The utility model provides a constant temperature system liquid level protection circuit which characterized by: the liquid level protection circuit of the constant temperature system comprises a compressor control loop and a liquid level control loop connected in parallel in the constant temperature system loop, wherein the liquid level control loop comprises a water tank low liquid level alarm node, a water tank high liquid level alarm node and an intermediate relay;
the water tank low liquid level alarm node, the water tank high liquid level alarm node and the intermediate relay coil are connected in series, a normally open contact of the intermediate relay is connected in parallel at two ends of the water tank high liquid level alarm node, and another normally open contact of the intermediate relay is connected in series in the compressor control loop.
2. The constant temperature system liquid level protection circuit of claim 1, wherein: the low liquid level alarm node of the water tank and the high liquid level alarm node of the water tank are normally open contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022568450.4U CN213402436U (en) | 2020-11-09 | 2020-11-09 | Constant temperature system liquid level protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022568450.4U CN213402436U (en) | 2020-11-09 | 2020-11-09 | Constant temperature system liquid level protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402436U true CN213402436U (en) | 2021-06-08 |
Family
ID=76194009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022568450.4U Expired - Fee Related CN213402436U (en) | 2020-11-09 | 2020-11-09 | Constant temperature system liquid level protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213402436U (en) |
-
2020
- 2020-11-09 CN CN202022568450.4U patent/CN213402436U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210608 Termination date: 20211109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |