Sensor application system and fluid system

Abstract

The utility model discloses a sensor application system and a fluid system, and relates to the technical field of heating and ventilation, a grounding path of a sensor module and a grounding path of a master control module form an independent ground division framework through a shielding shell, and the shielding shell of a sensor shell provides an electromagnetic shielding layer to suppress interference of an external electromagnetic field on a telecommunication module; the ground potential difference of the sensor side and the main control side is borne by the fluid pipeline in a grounded mode, high-voltage surge of a fluid system is prevented from being conducted to a circuit of the main control module, direct electrical connection is blocked through the isolation transmission module, and common-ground noise interference is eliminated. Therefore, anti-interference and safety collaborative optimization is realized at low cost.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning technology, specifically to a sensor application system and a fluid system. Background Technology

[0002] In the HVAC field, pressure sensors are key components for monitoring pipeline pressure, directly impacting system energy efficiency and safe operation. Because the sensor needs to directly contact the pipeline through a metal housing to transmit pressure, its internal circuitry is susceptible to high pipeline pressure, leakage current, and electromagnetic interference (EMC). To meet EMC requirements, the sensor needs to be connected to a shielding layer via a filter capacitor to suppress noise. However, this design, due to limitations in withstand voltage and leakage current, prevents the shielding layer from being directly grounded to the pipeline, creating a conflict between electrical isolation and electromagnetic compatibility.

[0003] Figure 1 The diagram illustrates an existing pressure sensor employing an "internal insulation isolation" scheme: the sensor's internal circuit board is isolated from the metal housing by a plastic insulating layer; one end of the filter capacitors (C10-C13) is connected to the circuit board's power / ground (+5V / GND), and the other end is connected to the metal shielding layer; the shielding layer is physically isolated from the external copper pipe ground through an insulating layer. While this design avoids the risk of withstand voltage breakdown caused by the shielding layer being directly connected to the pipeline, it has the following drawbacks: the multi-layer insulation structure (such as the plastic insulating layer) requires precision injection molding and assembly processes, significantly increasing manufacturing costs; and due to the insulation layer blocking the connection between the shielding layer and the pipeline, a low-impedance grounding path cannot be formed, leading to excessive high-frequency noise radiation.

[0004] Therefore, there is an urgent need for a pressure sensor solution that can meet EMC requirements while simplifying the structure and reducing costs. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a sensor application system and a fluid system. The grounding paths of the sensor module and the main control module are separated into independent grounding architectures via a shielding shell. The shielding shell of the sensor housing provides an electromagnetic shielding layer, suppressing interference from external electromagnetic fields on the telecommunications module. The ground potential difference between the sensor side and the main control side is carried by the grounding of the fluid pipeline, preventing high-voltage surges in the fluid system from being conducted to the circuitry of the main control module. Furthermore, an isolation transmission module blocks direct electrical connections, eliminating common-ground noise interference, thereby achieving low-cost, coordinated optimization of anti-interference and safety.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] In a first aspect, this utility model provides a sensor application system, which is applied to a fluid system, and the sensor application system includes:

[0008] A sensor module includes a sensor housing and a telecommunications module. The sensor housing includes a shielding shell and a first conductive connection portion and a second conductive connection portion electrically connected to the shielding shell. The telecommunications module is housed within the shielding shell. A third conductive connection portion is electrically connected to the grounding pipe of the fluid system. The telecommunications module includes a first grounding path, a first signal unit, and a first power path. The first signal unit is used to output a signal. The signal includes a pressure signal and / or a temperature signal.

[0009] The main control module includes a second grounding path, a second signal unit, and a second power supply path. The second signal unit is used to receive the signal output by the first signal unit.

[0010] The isolated transmission module includes a first connection side and a second connection side that are isolated from each other. The first grounding path, the first power path, and the output terminal of the first signal unit are connected to the first connection side, and the second grounding path, the second signal unit, and the second power path are connected to the second connection side.

[0011] Secondly, this utility model provides a fluid system, which includes the sensor application system described in the first aspect; the sensor module includes a plurality of sensors, the fluid system includes a circulation loop, and the circulation loop is provided with a compressor, a plurality of sensors, a first heat exchanger, a second heat exchanger and a four-way valve, the sensors are connected to the input terminal of the first signal unit, and the sensors are used to detect a preset signal of the fluid.

[0012] In summary, this invention provides a sensor application system and a fluid system. Electrical isolation between the first and second signal units, the first and second grounding paths, and the first and second power supply paths are achieved through an isolation transmission module. The grounding paths of the sensor module and the main control module are separated into independent grounding architectures via a shielding shell. The shielding shell of the sensor housing provides an electromagnetic shielding layer to suppress interference from external electromagnetic fields on the telecommunications module. The ground potential difference between the sensor side and the main control side is carried by the grounding of the fluid pipeline, preventing high-voltage surges in the fluid system from being conducted to the circuitry of the main control module. Furthermore, the isolation transmission module blocks direct electrical connections, eliminating common-ground noise interference, thereby achieving low-cost optimization of anti-interference and safety. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0015] Figure 1 A schematic diagram of a pressure sensor in the prior art is shown;

[0016] Figure 2 A schematic diagram of a fluid system provided by this utility model is shown;

[0017] Figure 3 A schematic diagram of the sensor application system provided by this utility model is shown;

[0018] Figure 4 An external schematic diagram of the sensor application system provided by this utility model is shown;

[0019] Figure 5a A schematic diagram of the circuit structure of a telecommunications module provided by this utility model is shown;

[0020] Figure 5b A schematic diagram of the circuit structure of a telecommunications module provided by this utility model is shown;

[0021] Figure 6a This invention provides a schematic diagram of a power supply mode.

[0022] Figure 6b This invention provides a schematic diagram of a power supply mode.

[0023] Figure 6c This invention provides a schematic diagram of a power supply mode.

[0024] Figure 7a This invention illustrates a sensor application system when the isolation transmission module circuit provided by this invention is an optocoupler.

[0025] Figure 7b and Figure 7cThis invention illustrates a sensor application system when the isolation transmission module circuit provided by this invention is used as an isolation amplifier;

[0026] Figure 7d This invention provides a schematic diagram of a sensor application system when the isolated transmission module circuit is an isolated analog-to-digital converter.

[0027] Figure 8 This invention provides a schematic diagram of the integrated design of the conductive connection portion.

[0028] Figure 9 A schematic diagram of the layered structure of the sensor module provided by this utility model is shown;

[0029] Explanation of reference numerals in the attached drawings: Grounding pipe 12 for the fluid system, sensor housing 101, sensor module 10, shielding shell 1011, first conductive connection 1012, second conductive connection 1013, third conductive connection 1014, fourth conductive connection 1015, copper sleeve 1017, telecommunications module 102, first grounding path 1021, first signal unit 1022, first power path 1023, cavity 1024, fluid 1025, main control module 20, second grounding path 201, second signal unit 202, second power path 203, isolation transmission module 30, first power supply module 01, second power supply module 02, first power supply 011, second power supply... Source 021; Heat source side unit 50, first heat exchanger 501, four-way valve 502, first interface 5021, second interface 5022, third interface 5023, fourth interface 5024, first pressure sensor 503, second pressure sensor 504, compressor 505, exhaust pipe 506, return gas pipe 507, second expansion valve 508, first filter 509, second filter 513, first shut-off valve 510, second shut-off valve 511, temperature sensor 512, gas-liquid separator 514, functional component 515, load side unit 60, second heat exchanger 601, first expansion valve 602, liquid pipe 70, liquid side outlet pipe 701, gas pipe 80, gas side outlet pipe 801.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Figure 2 A schematic diagram of a fluid system provided by this utility model is shown. Figure 3 A schematic diagram of the sensor application system provided by this utility model is shown; the fluid system includes the sensor application system. For example... Figure 2 , Figure 3 As shown, the fluid system includes a pipe through which fluid flows. When a preset signal of the fluid (such as a temperature signal or a pressure signal) needs to be detected, a sensor module 10 is installed on the pipe. The pipe is constructed as a grounded pipe, and the sensor installed on it is connected to the input terminal of the first signal unit 1022 of the sensor module 10 for real-time acquisition of fluid parameters.

[0037] Furthermore, the fluid system includes a circulation loop, on which a compressor 505, several sensors, a first heat exchanger 501, a second heat exchanger 601, and a four-way valve 502 are installed. The signals from the sensor module 10 are uploaded to the main control module 20 through the isolation transmission module 30 to achieve control.

[0038] In one possible implementation, the fluid system provided by this invention may be a heating, ventilation, and air conditioning (HVAC) system in some embodiments. The HVAC system may include a heat source-side unit 50 and a load-side unit 60, as well as a connecting pipe assembly connecting the heat source-side unit 50 and the load-side unit 60. The heat source-side unit 50, the load-side unit 60, and the connecting pipe assembly connecting them form a refrigerant circulation loop. The connecting pipe assembly includes a gas pipe 80 and a liquid pipe 70.

[0039] The heat source side unit 50 provided by this utility model includes a heat source housing, a compressor 505, a four-way valve 502, a second shut-off valve 511, a first shut-off valve 510, a first heat exchanger 501, several temperature sensors, several filters, and a first piping assembly. The first piping assembly constitutes a refrigerant circulation loop on the heat source side. The several filters include a first filter 509 and a second filter 513.

[0040] Compressor 505 is a machine that compresses low-pressure refrigerant into high-pressure refrigerant. In the refrigerant circulation loop, compressor 505 recovers low-pressure refrigerant at its return port, and after compression, discharges high-temperature, high-pressure refrigerant. The compressor 505 in this application can be a rotary compressor or a scroll compressor, and is not limited thereto.

[0041] In one possible implementation, the sensor includes a first pressure sensor 503 and a second pressure sensor 504; the first port 5021 of the four-way valve 502 is connected to the exhaust port of the compressor 505, the second port 5022 of the four-way valve 502 is connected to the first heat exchanger 501, the third port 5023 of the four-way valve 502 is connected to the return port of the compressor 505, and the fourth port 5024 of the four-way valve 502 is connected to the second heat exchanger 601. The fluid system between the first port 5021 and the exhaust port of the compressor 505 is defined as an exhaust pipe 506, and the first pressure sensor is disposed in the exhaust pipe 506 for detecting the exhaust pressure of the compressor 505; the fluid system between the third port 5023 and the return port of the compressor 505 is defined as a return pipe 507, and the second pressure sensor 504 is disposed in the return pipe 507, wherein the exhaust pipe 506 and the return pipe 507 are configured as a grounding pipe 12 in the sensor application system.

[0042] The first pressure sensor 503 and the second pressure sensor 504 monitor the discharge pressure (high-pressure side) and return pressure (low-pressure side) of the compressor 505 in real time, respectively, to ensure that the compressor 505 operates under safe conditions and prevent overload or low-pressure faults. The first pressure sensor 503 directly reflects the output power status of the compressor 505, preventing damage to components (such as seal failure) caused by exceeding the high-pressure limit. The second pressure sensor 504 monitors the suction status of the compressor 505 to prevent the risk of insufficient refrigerant or backflow liquid slugging. The grounding pipe 12 eliminates static electricity or electromagnetic interference and improves the accuracy of sensor signals (especially suitable for variable frequency compressor systems).

[0043] The four-way valve 502 has four ports, defined as port 5021, port 5022, port 5023, and port 5024. Port 5021 connects to the exhaust port of compressor 505, port 5022 connects to the gas-side connection of first heat exchanger 501, port 5023 connects to the return port of compressor 505, and port 5024 connects to load-side unit 60. A second shut-off valve 511 is located between port 5024 and load-side unit 60. This second shut-off valve 511 has two states: closed and open, thereby controlling the connection between port 5024 and load-side unit 60, i.e., controlling the gas-side flow path between heat source-side unit 50 and load-side unit 60. The four-way valve 502 has a switching switch, which allows selective connection of port 5021 to port 5022 or port 5024 by moving the switching switch. When the first port 5021 is connected to the second port 5022, the third port 5023 is connected to the fourth port 5024, and the refrigerant circulation loop is in cooling mode. When the first port 5021 is connected to the fourth port 5024, the second port 5022 is connected to the third port 5023, and the refrigerant circulation loop is in heating mode. Therefore, the four-way valve 502 also functions as a cooling / heating switching valve.

[0044] The first heat exchanger 501 exchanges heat with an external heat source, which can be air, water, ground, etc. The first heat exchanger 501 has a gas-side connection and a liquid-side connection. In the refrigerant circulation path, the gas-side connection is closer to the compressor 505 than the liquid-side connection. The liquid-side connection leads to the load-side unit 60. A first shut-off valve 510 is located between the liquid-side connection and the load-side connection. This first shut-off valve 510 has two states: closed and open, thereby controlling the flow between the liquid-side connection and the load-side unit 60, i.e., controlling the flow of liquid-side fluid between the heat source-side unit 50 and the load-side unit 60.

[0045] The fluid pipe between the compressor 505 discharge port and the first interface 5021 is defined as the discharge pipe 506. A first pressure sensor 503 is installed on the discharge pipe 506. The first pressure sensor 503 is a high-pressure sensor that detects the discharge pressure of the compressor 505. In some embodiments, a functional component 515 is provided between the compressor 505 discharge port and the first interface 5021. This functional component 515 can be an oil separator or a muffler. The discharge pipe 506 includes two fluid pipes, one of which connects the compressor 505 discharge port and the functional component 515, and the other fluid pipe connects the functional component 515 and the first interface 5021.

[0046] The fluid pipe between the compressor 505 return port and the third interface 5023 is defined as the return pipe 507. A second pressure sensor 504 is installed on the return pipe 507. The second pressure sensor 504 is a low-pressure sensor that detects the return pressure of the compressor 505. In some embodiments, a gas-liquid separator 514 is provided between the compressor 505 return port and the third interface 5023. The return pipe 507 includes two fluid pipes, one of which connects the compressor 505 return port and the gas-liquid separator 514, and the other fluid pipe connects the gas-liquid separator 514 and the third interface 5023.

[0047] In one possible implementation, the fluid system is a heating, ventilation, and air conditioning (HVAC) system. The four-way valve 502 switches between cooling and heating modes via interfaces (5021-5024), supporting the system's bidirectional heat exchange capability.

[0048] In cooling mode, the four-way valve 502 is in the following states: First port 5021 → Second port 5022 is open (high-pressure exhaust to the heat exchanger on the heat source side); Fourth port 5024 → Third port 5023 is open (low-pressure return gas to the compressor). The refrigerant flow is as follows: Compressor 505 → Exhaust pipe 506 (high-pressure gas) → First port 5021 → Second port 5022 → First heat exchanger 501 (condensation and heat dissipation, liquefaction into high-pressure liquid) → Liquid pipe 70 → Second expansion valve 508 (throttling and pressure reduction) → Second heat exchanger 601 (evaporation and heat absorption, conversion into low-temperature gas) → Fourth port 5024 → Third port 5023 → Return pipe 507 → Gas-liquid separator 514 (separation of residual liquid refrigerant) → Compressor 505.

[0049] In heating mode, the states of the four-way valve 502 include: the first port 5021 to the fourth port 5024 are open (high-pressure exhaust to the load-side heat exchanger); the second port 5022 to the third port 5023 are open (low-pressure return gas to the compressor). The refrigerant flow includes: compressor 505 → exhaust pipe 506 (high-pressure gas) → first port 5021 → fourth port 5024 → second heat exchanger 601 (condensation and heat dissipation, liquefaction into high-pressure liquid) → liquid pipe 70 → first expansion valve 602 (throttling and pressure reduction) → first heat exchanger 501 (evaporation and heat absorption, conversion into low-temperature gas) → second port 5022 → third port 5023 → return pipe 507 → gas-liquid separator 514 → compressor 505.

[0050] The gas-liquid separator 514 is located at the end of the return gas pipe 507 (upstream of the return gas port of the compressor 505) to separate the liquid components entrained in the refrigerant and prevent liquid slugging from damaging the compressor.

[0051] In one possible implementation, the fluid system further includes: a first expansion valve 602, a second expansion valve 508, a first shut-off valve 510, and a second shut-off valve 511; the fourth port 5024 of the four-way valve 502 is connected to the gas-side port of the second heat exchanger 601 through the second shut-off valve 511; the liquid-side port of the first heat exchanger 501 is connected to the liquid-side port of the second heat exchanger 601 by connecting the second expansion valve 508 and the first shut-off valve 510 in series.

[0052] A second expansion valve 508, which also serves as a flow regulating valve on the heat source side, is provided between the liquid-side connection of the first heat exchanger 501 and the first shut-off valve 510. The heat source-side unit 50 provided in this invention is equipped with the second expansion valve 508, and the load-side unit 60 is equipped with a first expansion valve 602. The second expansion valve 508 is used for throttling and pressure reduction, regulating the refrigerant flow from the first heat exchanger 501 to the liquid pipe 70 (heat source side → load side); the first expansion valve 602 is used to control the flow distribution in the load-side liquid pipe (inlet section of the second heat exchanger 601). The first expansion valve 602 and the second expansion valve 508 work together to regulate the refrigerant flow, matching the heat exchange requirements of different heat exchangers (first heat exchanger 501, second heat exchanger 601), and improving system energy efficiency. The flow regulating valve in this application can be an electronic expansion valve.

[0053] The second heat exchanger 601 has a gas-side pipe section and a liquid-side pipe section. The gas-side pipe section is connected to the second shut-off valve 511 of the heat source side unit 50, and the liquid-side pipe section is connected to the first shut-off valve 510. A first expansion valve 602, which is the load-side flow regulating valve, is provided on the liquid-side pipe section. The load-side flow regulating valve in this application can be an electronic expansion valve.

[0054] The first filter 509 is located upstream of the second expansion valve 508 (at the inlet of the liquid pipe 70 on the heat source side) to filter impurities and prevent the valve body from becoming clogged; the second filter 513 is located downstream of the first expansion valve 602 (at the outlet of the liquid pipe 70 on the load side) to intercept residual particulate matter in the pipeline.

[0055] The first shut-off valve 510 (liquid-side shut-off valve) controls the opening and closing of the liquid line 70, used for refrigerant recovery or maintenance isolation; the second shut-off valve 511 (gas-side shut-off valve) controls the opening and closing of the gas line 80, blocking the gas-side circuit during maintenance. The first shut-off valve 510 and the second shut-off valve 511 are used for closing and opening; the second shut-off valve 511 can be a gas-side shut-off valve, and the first shut-off valve 510 can be a liquid-side shut-off valve. The first shut-off valve 510 and the second shut-off valve 511 provide pipeline on / off control, supporting the isolation of faulty sections during partial maintenance and preventing a complete system shutdown.

[0056] The upstream starting point of the liquid-side outlet pipe 701 is the liquid-side interface of the first heat exchanger 501, and the downstream ending point is the first shut-off valve 510. The upstream starting point of the gas-side outlet pipe 801 is the first shut-off valve 510, and the downstream ending point is the fourth interface 5024 of the four-way valve 502.

[0057] The load-side unit 60 is set in the target space where the temperature is to be regulated. The load-side unit 60 has a load housing with an air inlet and an air outlet. Both the air inlet and the air outlet are in communication with the air in the target space. The load housing houses a second heat exchanger 601 and a fan. The second heat exchanger 601 is set between the air inlet and the air outlet. The fan drives the air in the target space to enter the load housing from the air inlet. After heat exchange with the second heat exchanger 601, the air returns to the target space through the air outlet. The second heat exchanger 601 exchanges heat with the air in the target space, thereby regulating the ambient temperature of the target space.

[0058] In one possible implementation, the main control module 20 is used to adjust the opening degree of the first expansion valve 602 and the second expansion valve 508 according to the pressure signal of the second pressure sensor 504.

[0059] The second pressure sensor 504 is located on the return pipe 507 (low-pressure side) and directly reflects the suction state of the compressor 505. The main control module 20 acquires the low-pressure side pressure signal of the return pipe 507 in real time and dynamically adjusts the opening of the first expansion valve 602 (e.g., indoor unit expansion valve) through PID algorithm or lookup table method to control the flow rate of refrigerant into the indoor heat exchanger; and / or adjusts the opening of the second expansion valve 508 (e.g., outdoor unit expansion valve) to adjust the distribution ratio of refrigerant into the outdoor heat exchanger.

[0060] In one possible implementation, the main control module 20 is used to shut down the compressor 505 and start the standby mode based on the pressure signal of the second pressure sensor 504 being within a first preset protection range.

[0061] When the second pressure sensor 504 detects a pressure signal exceeding the first preset protection range, the main control module 20 immediately shuts down the compressor 505. In another embodiment, the power supply to the expansion valve can be cut off (to prevent malfunction) and / or the system can enter standby mode (maintaining a low-power state, awaiting manual reset or automatic recovery). This setting can prevent overload / undervoltage damage, avoid continuous operation of the compressor under ultra-high pressure (seal failure) or ultra-low pressure (refrigerant leakage), and reduce the mechanical impact of abnormal operating conditions on the compressor motor and valve body.

[0062] The first preset protection range is a safety threshold range set for the low-pressure side pressure of the return gas pipe 507. It is typically divided into a lower limit and an upper limit for return gas pressure. For example, a lower limit of ≥0.1MPa prevents insufficient refrigerant from causing low compressor suction pressure, which could lead to motor overheating or poor lubrication. An upper limit of ≤1.2MPa avoids excessively high return gas pressure (potentially due to abnormal switching of the four-way valve 502 or blockage of the expansion valve, causing liquid slugging). For instance, in cooling mode, the normal return gas pressure range is 0.3–0.6MPa. If the detected value consistently falls below 0.1MPa (potential refrigerant leakage) or exceeds 1.2MPa (expansion valve failure), protection is triggered.

[0063] In one possible implementation, the main control module 20 is used to shut down the compressor 505 and activate the overload alarm mode based on the pressure signal of the first pressure sensor 503 being within a second preset protection range.

[0064] The main control module 20 implements high-pressure side safety protection through the first pressure sensor 503. When the first pressure sensor 503 detects that the exhaust pressure exceeds the second preset protection range, the main control module 20 immediately activates the overload alarm mode (audible and visual alarm, remote notification, or fault code display, etc.). In another embodiment, the compressor 505 can also be shut down, power output cut off, and abnormal pressure data recorded to support subsequent fault diagnosis. This setting can prevent the compressor motor from burning out due to high-pressure overload (such as refrigerant blockage or condenser failure); and prevent the exhaust pipe 506 from cracking at the weld or failing to seal due to overpressure.

[0065] The second preset protection range is the safe threshold range for the high-pressure side pressure of the exhaust pipe 506, which is usually divided into a lower limit and an upper limit. For example, the lower limit of exhaust pressure is ≥1.5MPa (the lower limit of the high-pressure side pressure in normal cooling mode), and the upper limit of exhaust pressure is ≤3.5MPa (the compressor's tolerance limit). When the exhaust pressure continuously exceeds the upper limit (such as due to poor condenser heat dissipation or excessive refrigerant), overload protection is triggered; when the exhaust pressure continuously falls below the lower limit (such as due to refrigerant leakage or abnormal compressor power), low-pressure protection may be triggered.

[0066] In one possible implementation, the lower limit of the exhaust pressure is greater than the upper limit of the return pressure (e.g., 1.5 MPa > 0.8 MPa), reflecting the pressure gradient difference between the high-pressure and low-pressure sides. This avoids cross-interference between the high-pressure and low-pressure side protection logics and ensures accurate response.

[0067] Dual pressure monitoring on the high-pressure side (exhaust pipe 506) and the low-pressure side (return pipe 507) provides full-condition protection for compressor 505 (cooling / heating mode switching, start-stop transient shocks, etc.).

[0068] In one possible implementation, the sensor includes a temperature sensor 512; the temperature sensor 512 is located at at least one of the following positions: on the heat transfer tube of the first heat exchanger 501; at the input end of the first heat exchanger 501; or at the output end of the first heat exchanger 501.

[0069] In one possible implementation, the main control module 20 is used to adjust the opening degree of the first expansion valve 602 and the second expansion valve 508 according to the temperature signal of the temperature sensor 512.

[0070] Temperature sensors 512 are installed at least at one of the heat transfer tubes, input end, and output end of the first heat exchanger 501 to acquire temperature gradient data at different locations in real time, evaluate heat exchange efficiency (such as condensation / evaporation rate), and provide multi-dimensional input for expansion valve regulation. The main control module 20 analyzes the temperature signal (such as input / output temperature difference) and dynamically adjusts the first expansion valve 602 (controlling the refrigerant inflow) and the second expansion valve 508 (distributing refrigerant to different branches) to achieve heat exchanger load balancing and maximum energy efficiency.

[0071] For example, based on the temperature difference between the input and output terminals of the temperature sensor 512, the main control module 20 calculates the heat exchange efficiency and provides feedback to adjust the opening of the expansion valve. When the temperature difference ΔT is lower than the set value (e.g., ΔT < 5℃ in cooling mode), the opening of the first expansion valve 602 is increased to increase the refrigerant flow. When ΔT is too high (e.g., ΔT > 15℃), the opening is reduced to avoid overloading the heat exchanger.

[0072] In one possible implementation, the main control module 20 combines the data from the first pressure sensor 503 (high pressure side) and the temperature sensor 512 to achieve coordinated regulation of refrigerant flow and compressor power, such as synchronous frequency reduction and throttling at high temperature and high pressure.

[0073] In one possible implementation, the heat source housing provided by this utility model is constructed as a hollow housing, wherein the compressor 505, the four-way valve 502, the first heat exchanger 501, a number of temperature sensors, a number of pressure sensors, a number of filters, the second expansion valve 508, and the first pipeline assembly are housed inside the heat source housing, and the second shut-off valve 511 and the first shut-off valve 510 can be entirely housed inside the heat source housing, or partially or entirely exposed on the outside of the heat source housing.

[0074] Figure 3 This invention illustrates a sensor application system provided by the present invention. The sensor application system is applied to a fluid system and includes a sensor module 10, a main control module 20, and an isolation transmission module 30. In one possible embodiment, the sensor module 10 includes a telecommunications module 102.

[0075] In one possible implementation, the sensor module 10 further includes a sensor housing 101. Figure 4 An external schematic diagram of the sensor application system provided by this utility model is shown; as follows: Figure 3 , Figure 4 As shown: The sensor housing 101 includes a shielding shell 1011 and a first conductive connection portion 1012 and a second conductive connection portion 1013 electrically connected to the shielding shell 1011. The shielding shell 1011 houses the telecommunications module 102 of the sensor module 10. The third conductive connection portion 1014 is electrically connected to the grounding pipe 12 of the fluid system. The telecommunications module 102 includes a first grounding path 1021, a first signal unit 1022 and a first power path 1023. The first signal unit 1022 is used to process a preset signal detected from the pipeline of the fluid system and output the processed signal. The preset signal includes a pressure signal and / or a temperature signal.

[0076] In one possible implementation, a cavity 1024 is provided inside the shielding shell 1011, and the third conductive connection part 1014 is configured as a tube. One end of the third conductive connection part 1014 is connected to the grounding pipe 12 through a fluid 1025, and the other end of the third conductive connection part 1014 is connected to the cavity 1024. The telecommunications module 102 includes a detection element that detects a preset signal in the cavity 1024 and transmits the preset signal to the first signal unit 1022.

[0077] The main control module 20 includes a second grounding path 201, a second signal unit 202, and a second power supply path 203. The second signal unit 202 receives the signal output by the first signal unit 1022. The main control module 20 is used to control the fluid system according to the received signal.

[0078] The isolation transmission module 30 includes a first connection side and a second connection side that are isolated from each other. The first grounding path 1021, the first power path 1023, and the second connection terminal of the first signal unit 1022 are connected to the first connection side, and the second grounding path 201, the second signal unit 202, and the second power path 203 are connected to the second connection side. This achieves electrical isolation between the first signal unit 1022 and the second signal unit 202, electrical isolation between the first grounding path 1021 and the second grounding path 201, and isolation between the first power path 1023 and the second power path 203.

[0079] This application establishes an independent grounding architecture by connecting the grounding path (first grounding path 1021) of the sensor module 10 and the grounding path (second grounding path 201) of the main control module 20 through a shielding shell 1011 and a fluid pipeline. An isolation transmission module 30 is introduced to disconnect the direct electrical connection between the two grounding methods, thereby achieving low-cost optimization of anti-interference and electrical safety in high-pressure fluid scenarios. Addressing the shortcomings of traditional air conditioning systems where sensor signals rely on high-cost isolation devices for direct voltage transmission, this application converts sensor signals into coded signals based on a digital communication protocol. The protocol's inherent anti-interference characteristics replace the physical isolation layer, achieving low-cost electrical isolation between the sensor module and the main control module while ensuring signal integrity.

[0080] In one possible implementation, the telecommunications module 102 further includes a first capacitor and a second capacitor; a first end of the first capacitor is connected to a first power path 1023, and a second end of the first capacitor is connected to a first conductive connection portion; a first end of the second capacitor is connected to the first power path 1023, and a second end of the second capacitor is connected to a second conductive connection portion.

[0081] In one possible implementation, Figure 5a The diagram shows a circuit structure of a telecommunications module provided by this utility model; the first end of the first capacitor C1 is connected to the first power path 1023, and the second end of the first capacitor C1 is connected to the first conductive connection part 1012; the first end of the second capacitor C2 is connected to the first ground path 1021, and the second end of the second capacitor C2 is connected to the second conductive connection part 1013.

[0082] In one possible implementation, the telecommunications module 102 further includes a third capacitor and a fourth capacitor; the third capacitor is connected in parallel with the first capacitor, and the second end of the third capacitor is connected to the third conductive connection portion; the fourth capacitor is connected in parallel with the second capacitor, and the second end of the fourth capacitor is connected to the third conductive connection portion.

[0083] In one possible implementation, Figure 5b The diagram shows a circuit structure of a telecommunications module provided by this utility model; the telecommunications module 102 also includes a third capacitor C3 and a fourth capacitor C4; the third capacitor C3 is connected in parallel with the first capacitor C1; the first end of the third capacitor C3 is connected to the first power path 1023, and the second end of the third capacitor C3 is connected to the third conductive connection part 1014; the fourth capacitor C4 is connected in parallel with the second capacitor C2, the first end of the fourth capacitor C4 is connected to the first ground path 1021, and the second end of the fourth capacitor C4 is connected to the fourth conductive connection part 1015.

[0084] In one possible implementation, the telecommunications module 102 includes a first signal unit 1022. The first signal unit 1022 amplifies, filters, and digitizes the raw sensor signals, such as pressure / temperature. The sensor housing 101 is connected to the air conditioning system piping via a third conductive connection 1014, diverting interference current to ground and simultaneously achieving independent grounding on the sensor side. Four capacitors C1-C4 are used to expand the filtering bandwidth and redundancy, filtering out power path noise and providing a "clean" power supply to the first signal unit 1022, thus improving signal sampling accuracy.

[0085] The shielding shell serves as the system grounding point or electromagnetic shielding layer, providing a low-impedance path. High-frequency noise on the power path (such as switching power supply harmonics and radio frequency interference) is discharged through this low-impedance path (the shielding shell), reducing interference to sensitive circuits (such as the first signal unit 1022). Economical EMI suppression is achieved using dual capacitors, meeting the interference immunity requirements of general electronic equipment.

[0086] In one possible implementation, the sensor application system further includes: a first power supply module 01 and a second power supply module 02 that are independently configured; the first power supply module 01 is connected to a first power path 1023 and a first grounding path 1021, and the second power supply module 02 is connected to a second power path 203 and a second grounding path 201.

[0087] In one possible implementation, Figure 6a The diagram shows the power supply mode provided by this utility model. The sensor application system also includes a first power supply 011 and a second power supply 021. The first power supply 011 is connected to the first power supply module 01, and the second power supply 021 is connected to the second power supply module 02.

[0088] The first power supply 011 is connected to the first power supply module 01 to power the main control module 20 (such as an MCU or FPGA). The second power supply 021 is independent of the first power supply 011 and is connected to the second power supply module 02 to power the sensor module 10 (such as a pressure / temperature sensor). The dual independent power supplies cut off the common ground loop between the main control module and the sensor, suppressing the interference of power supply noise (such as motor start / stop and relay operation) on the sensor signal and improving sampling accuracy.

[0089] In one possible implementation, Figure 6b The diagram shows the power supply mode provided by this utility model. The sensor application system also includes a first power supply 011, and the first power supply module 01 and the second power supply module 02 are both connected to the first power supply 011.

[0090] The sensor application system also includes a first power supply 011, a first power supply module 01 including a first winding, and a second power supply module 02 including a second winding. The first power supply module 01 is connected to the first power supply 011 through the first winding, and the second power supply module 02 is connected to the first power supply 011 through the second winding.

[0091] The first power supply 011 is divided into two independent power supplies, one for the main control module and the other for the sensor module, with physical separation to avoid common ground interference. The first power supply module 01 includes a first winding, a power adapter, and wires, and is connected to the first power supply 011 through the first winding; the second power supply module 02 includes a second winding, a power adapter, and wires, and is connected to the first power supply 011 through the second winding.

[0092] The first power supply 011 provides power to different modules through physically isolated dual outputs: the main control module 20 is directly powered by the first power supply module 01; the sensor module 10 is independently powered by the second power supply module 02. The two power supply systems use winding magnetic coupling isolation and physical separation layout to block common ground loop interference and ensure signal chain integrity.

[0093] In one possible implementation, Figure 6c The diagram shows a power supply mode provided by this utility model. The sensor application system also includes a first power supply 011, and a first power supply module 01 connected to the first power supply 011; or, the sensor application system also includes a second power supply 021, and a second power supply module 02 connected to the second power supply 021.

[0094] The first power supply module 01 is connected to the first power supply 011, and the second power supply module 02 is connected to the first power supply module 01 through an isolation converter so that the second power supply 021 can obtain a power supply voltage; the second power supply module 02 "takes power" from the first power supply module 01 through the isolation converter to generate a power supply voltage that is completely isolated from the first power supply module 01.

[0095] In another possible implementation, the second power supply module 02 is connected to the first power supply 011. The first power supply module 01 is connected to the second power supply module 02 via an isolation converter, so that the first power supply 011 obtains a power supply voltage. The first power supply module 01 draws power from the second power supply module 02 via the isolation converter to generate a power supply voltage that is completely isolated from the second power supply module 02.

[0096] In one possible implementation, the first connection side of the isolated transmission module 30 is configured as a first electrical connector, which includes a first signal terminal, a first power terminal, and a first ground terminal. The first signal terminal is connected to the first signal unit, the first power terminal is connected to the first power path, and the first ground terminal is connected to the first ground path. The second connection side of the isolated transmission module 30 is configured as a second electrical connector, which includes a second signal terminal, a second power terminal, and a second ground terminal. The second signal terminal is connected to the second signal unit, the second power terminal is connected to the second power path, and the second ground terminal is connected to the second ground path. The isolated transmission module 30 includes one or more of an optocoupler, an isolation amplifier, and an isolation analog-to-digital converter.

[0097] Figure 7a , Figure 7b , Figure 7c , Figure 7d The present invention illustrates a three-level modular architecture for a sensor application system. The isolation transmission module includes a first power supply terminal, a first ground terminal, a second power supply terminal, and a second ground terminal. A first power supply module 01 is connected to the first power supply terminal and the first ground terminal respectively. The first power supply terminal is connected to the second power path 203, and the first ground terminal is connected to the second ground path 201. The first power supply module 01 is used to supply power to the main control module 20. A second power supply module 02 is connected to the second power supply terminal and the second ground terminal respectively. The second power supply terminal is connected to the first power path 1023, and the second ground terminal is connected to the first ground path 1021. The second power supply module is used to supply power to the sensor module 10.

[0098] The main control module 20 receives a stable voltage from the second power supply module 02 through the second power path 203; it is also connected to the system reference ground through the second ground path 201 to form a low-impedance ground on the main control side; and it receives processed signals from the isolation transmission module 30 through the second signal unit 202. The first signal unit 1022 processes the signals detected by the sensor module 10 and transmits the processed signals to the main control module 20 through the isolation transmission module 30.

[0099] Figure 7a The diagram shows an isolated transmission module circuit provided by this utility model, which is an optocoupler. The isolated transmission module 30 includes the optocoupler. A first signal unit 1022 processes the signal detected by the sensor module 10 and transmits the processed signal to the isolated transmission module 30. The first connection side of the optocoupler is connected to the first ground path 1021, the first power path 1023, and the first signal unit 1022. The second connection side of the optocoupler is connected to the second ground path 201, the second signal unit 202, and the second power path 203.

[0100] Figure 7b and Figure 7c The diagram shows an isolation transmission module circuit provided by this utility model, which is an isolation amplifier. The isolation transmission module 30 includes an isolation amplifier; a first signal unit 1022 processes the signal detected by the sensor module 10 and transmits the processed signal to the isolation transmission module 30. The first connection side of the isolation amplifier is connected to the first ground path 1021, the first power path 1023, and the first signal unit 1022, and the second connection side of the isolation amplifier is connected to the second ground path 201, the second signal unit 202, and the second power path 203.

[0101] Figure 7d The diagram shows an isolated transmission module circuit provided by this utility model, which is an isolated analog-to-digital converter. The isolated transmission module 30 includes an isolated analog-to-digital converter; a first signal unit 1022 processes the signal detected by the sensor module 10 and transmits the processed signal to the isolated transmission module 30. The first connection side of the isolated analog-to-digital converter is connected to the first ground path 1021, the first power path 1023, and the first signal unit 1022, and the second connection side of the isolated analog-to-digital converter is connected to the second ground path 201, the second signal unit 202, and the second power path 203.

[0102] Figure 8 The diagram shows the mechanical-electrical integration design of the third conductive connection 1014 provided by this utility model with the grounding system. The high reliability and low impedance characteristics of the grounding connection are ensured by the reinforcement of the copper sleeve 1017 and the filling of conductive material.

[0103] In one possible implementation, the material of the shielding shell 1011 includes one of stainless steel, carbon steel, aluminum, aluminum alloy, copper, and copper alloy, and the material of the first conductive connection part 1012, the second conductive connection part 1013, the third conductive connection part 1014, and the fourth conductive connection part 1015 includes one of stainless steel, carbon steel, aluminum, aluminum alloy, copper, and copper alloy.

[0104] In one possible implementation, the side wall of the grounding conduit 12 has an opening, and one end of the third conductive connection 1014 is inserted into the opening and welded to the opening for fixation.

[0105] In one possible implementation, the third conductive connection 1014 is configured as a copper tube or a copper alloy tube, the grounding conduit is configured as a copper tube, one end of the third conductive connection 1014 is inserted into the opening and connected to the inner wall of the opening by a first solder, the first solder including a copper-based solder.

[0106] In one possible implementation, the third conductive connection 1014 is constructed as a copper pipe or a copper alloy pipe, the grounding pipe is constructed as a stainless steel pipe, a transition pipe is welded to the opening of the stainless steel pipe, the main body material of the transition pipe includes copper, one end of the third conductive connection 1014 is welded to the transition pipe and is in fluid communication with the grounding pipe through the transition pipe.

[0107] In one possible implementation, the isolation transmission module 30 and the main control module 20 are located on the same circuit board, or the isolation transmission module 30 and the main control module 20 are located on different circuit boards.

[0108] Figure 9 The present invention illustrates the layered structure of the sensor module, which adopts a vertical stacking design, and the components achieve electrical connection, mechanical protection and sealing functions through precision assembly. From top to bottom: The plastic shell serves as the outermost protective barrier, providing insulation and securing the internal wiring harness and potting compound layer. The wiring harness is responsible for transmitting sensor signals (such as pressure / temperature data) to the main control module and connecting to the external power supply. The potting compound layer's core function is sealing for waterproofing and dustproofing, while also buffering vibration energy to improve shock resistance. The encapsulated shell integrates room temperature vulcanizing (RTV) rubber to fill gaps for insulation and shock absorption, and connects the flexible printed circuit board (FPC) to the external circuitry via connectors (metal pins or spring pins). The FPC carries components such as ceramic capacitors and establishes the electrical connection between the first signal unit and the connectors. The ceramic capacitors filter out power supply noise to ensure signal stability. The bottom uses an internal sealing ring to seal and prevent leakage between the sensor module and the copper pipe interface, while also buffering the thermal expansion difference between the copper pipe and the shell. The shell provides mechanical support and secures the copper pipe, which serves as a conductive connection and is welded to the metal grounding pipe of the HVAC fluid system, transmitting refrigerant pressure to the pressure detection unit hidden beneath the RTV layer.

[0109] The mechanical structure, circuit layout, and sealing design of the sensor module provided by this utility model, along with the metal shielding shell, potting compound, and sealing ring, work together to ensure signal stability and environmental tolerance; the copper tube directly conducts refrigerant pressure, and the FPC circuit processes signals quickly; the modular design supports quick replacement and reduces maintenance costs.

[0110] In summary, this invention provides a sensor application system and a fluid system. The sensor application system is applied to the fluid system, achieving isolation between the first and second power paths through an isolation transmission module. The grounding path of the sensor module and the grounding path of the main control module are separated into independent grounding architectures through a shielding shell. The shielding shell of the sensor housing provides an electromagnetic shielding layer, suppressing interference from external electromagnetic fields on the telecommunications module. The ground potential difference between the sensor side and the main control side is carried by the grounding of the fluid pipeline, preventing high-voltage surges in the fluid system from being conducted to the circuitry of the main control module. Furthermore, the isolation transmission module blocks direct electrical connections, eliminating common-ground noise interference, thereby achieving low-cost, interference-resistant, and safety-optimized synergy.

[0111] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0112] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0113] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A sensor application system for application to a fluid system, the sensor application system comprising: The sensor application system includes: A sensor module includes a sensor housing and a telecommunications module. The sensor housing includes a shielding shell and a first conductive connection portion and a second conductive connection portion electrically connected to the shielding shell. The telecommunications module is housed within the shielding shell. A third conductive connection portion is electrically connected to the grounding pipe of the fluid system. The telecommunications module includes a first grounding path, a first signal unit, and a first power path. The first signal unit is used to output a signal. The signal includes a pressure signal and / or a temperature signal. The main control module includes a second grounding path, a second signal unit, and a second power supply path. The second signal unit is used to receive the signal output by the first signal unit. The isolated transmission module includes a first connection side and a second connection side that are isolated from each other. The first grounding path, the first power path, and the output terminal of the first signal unit are connected to the first connection side, and the second grounding path, the second signal unit, and the second power path are connected to the second connection side.

2. The system of claim 1, wherein, The telecommunications module further includes a first capacitor and a second capacitor; a first end of the first capacitor is connected to the first power path, and a second end of the first capacitor is connected to the first conductive connection portion; a first end of the second capacitor is connected to the first ground path, and a second end of the second capacitor is connected to the second conductive connection portion.

3. The system of claim 2, wherein, The telecommunications module further includes a third capacitor and a fourth capacitor; the third capacitor is connected in parallel with the first capacitor; and the fourth capacitor is connected in parallel with the second capacitor.

4. The system of claim 1, wherein, The sensor application system also includes: a first power supply module and a second power supply module that are independently configured; The first power supply module is connected to the first power path and the first ground path, and the second power supply module is connected to the second power path and the second ground path.

5. The system of claim 4, wherein, The sensor application system also includes a first power supply and a second power supply, wherein the first power supply is connected to the first power supply module and the second power supply is connected to the second power supply module.

6. The system of claim 4, wherein, The sensor application system further includes a first power supply, the first power supply module includes a first winding, the second power supply module includes a second winding, the first power supply module is connected to the first power supply through the first winding, and the second power supply module is connected to the first power supply through the second winding.

7. The system of claim 4, wherein, The sensor application system also includes a first power supply and an isolation converter; The first power supply module is connected to the first power supply, and the second power supply module is connected to the first power supply module through the isolation converter; or, the second power supply module is connected to the first power supply, and the first power supply module is connected to the second power supply module through the isolation converter.

8. The system of any one of claims 1-7, wherein, The first connection side of the isolation transmission module is configured as a first electrical connector, which includes a first signal terminal, a first power terminal and a first ground terminal. The first signal terminal is connected to the first signal unit, the first power terminal is connected to the first power path and the first ground terminal is connected to the first ground path. The second connection side of the isolation transmission module is configured as a second electrical connector, which includes a second signal terminal, a second power terminal, and a second ground terminal. The second signal terminal is connected to the second signal unit, the second power terminal is connected to the second power path, and the second ground terminal is connected to the second ground path. The isolated transmission module includes one or more of an optocoupler, an isolation amplifier, and an isolation analog-to-digital converter.

9. The system of any one of claims 1-7, wherein, The material of the shielding shell includes one of stainless steel, carbon steel, aluminum, aluminum alloy, copper, and copper alloy, and the material of the first conductive connection part, the second conductive connection part, and the third conductive connection part includes one of stainless steel, carbon steel, aluminum, aluminum alloy, copper, and copper alloy.

10. The system of any one of claims 1-7, wherein, The shielding shell is provided with a cavity, and the third conductive connection part is constructed into a tubular shape. One end of the third conductive connection part is in fluid communication with the grounding pipe, and the other end of the third conductive connection part is in communication with the cavity. The telecommunications module includes a detection element that detects a preset signal in the cavity and transmits the preset signal to the first signal unit.

11. The system of claim 10, wherein, An opening is provided on the side wall of the grounding pipe, and one end of the third conductive connection part is inserted into the opening and welded to the opening for fixation.

12. The system of claim 11, wherein, The third conductive connection is constructed as a copper tube or a copper alloy tube, the grounding pipe is constructed as a copper tube, one end of the third conductive connection is inserted into the opening and connected to the inner wall of the opening by a first solder, the first solder including copper-based solder.

13. The system of claim 10, wherein, The third conductive connection is constructed as a copper pipe or a copper alloy pipe, the grounding pipe is constructed as a stainless steel pipe, a transition pipe is welded to the opening of the stainless steel pipe, the main material of the transition pipe includes copper, one end of the third conductive connection is welded to the transition pipe and is in fluid communication with the grounding pipe through the transition pipe.

14. The system of any one of claims 1-7, wherein, The isolation transmission module and the main control module are located on the same circuit board, or the isolation transmission module and the main control module are located on different circuit boards.

15. A fluid system, comprising: The fluid system includes the sensor application system as described in any one of claims 1-14; the sensor module includes a plurality of sensors, the fluid system includes a circulation loop, and the circulation loop is provided with a compressor, a plurality of sensors, a first heat exchanger, a second heat exchanger and a four-way valve, the sensors are connected to the input terminal of the first signal unit, and the sensors are used to detect a preset signal of the fluid.

16. The system of claim 15, wherein, The sensor includes a first pressure sensor and a second pressure sensor; The first port of the four-way valve is connected to the exhaust port of the compressor, the second port of the four-way valve is connected to the first heat exchanger, the third port of the four-way valve is connected to the return port of the compressor, and the fourth port of the four-way valve is connected to the second heat exchanger. The fluid pipe of the fluid system between the first interface and the compressor exhaust port is defined as an exhaust pipe, and the first pressure sensor is disposed on the exhaust pipe for detecting the exhaust pressure of the compressor; the fluid pipe of the fluid system between the third interface and the compressor return port is defined as a return pipe, and the second pressure sensor is disposed on the return pipe, wherein the exhaust pipe and the return pipe are constructed as grounding pipes in the sensor application system.

17. The system of claim 16, wherein, The fluid system further includes: a first expansion valve, a second expansion valve, a first shut-off valve, and a second shut-off valve; The fourth port of the four-way valve is connected to the gas-side port of the second heat exchanger through the second shut-off valve; the liquid-side port of the first heat exchanger is connected to the liquid-side port of the second heat exchanger by the second expansion valve and the first shut-off valve connected in series.

18. The system of claim 15, wherein, The sensor includes a temperature sensor; the temperature sensor is located at least one of the following positions: on the heat transfer tube of the first heat exchanger; at the input end of the first heat exchanger; or at the output end of the first heat exchanger.

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