A Gas Heat Pump Cooling Water Temperature Detection System and Detection Method

Abstract

The present invention relates to a gas heat pump cooling water temperature detection system and a detection method, belonging to the technical field of gas heat pumps. The gas heat pump cooling water temperature detection system includes a refrigeration system and a cooling water system. The refrigeration system includes a compressor, a condenser, a throttling component, and an evaporator that are connected in sequence to form a loop. The cooling water system includes an engine, a radiator, and a cooling water pump that are connected in sequence to form a loop. The compressor and the engine are connected by belt drive. A high-pressure sensor for detecting high-pressure is provided at the outlet of the compressor. An ambient temperature sensor for detecting ambient temperature is provided between the condenser and the radiator. A water temperature sensor for detecting the cooling water temperature is provided at the cooling water outlet of the engine. The present invention can calculate different target cooling water temperatures according to different states of the unit to timely detect the problem of insufficient cooling water and provide corresponding prompts and protections.

Description

Technical Field

[0001] The present invention relates to a gas heat pump cooling water temperature detection system and a detection method, belonging to the technical field of gas heat pumps. Background Art

[0002] A gas heat pump is an air-conditioning system that uses a gas engine to drive a compressor to operate for refrigeration and heating. In a gas heat pump system, the cooling water not only cools the engine but also transfers the engine heat to the air conditioner, thereby improving the heating effect of the air conditioner. Once the cooling water is insufficient, it will not only affect the heating effect of the air conditioner but also may cause the engine to overheat and be damaged. Therefore, when the cooling water is insufficient, the system must protect the unit in advance to prevent the engine from being damaged.

[0003] The cooling water radiator of a gas heat pump is different from that of a traditional vehicle engine radiator. Because the radiator of a gas heat pump is usually arranged inside the air conditioner condenser. In summer when refrigerating, the air first exchanges heat with the condenser, the air temperature rises, and then exchanges heat with the cooling water radiator. Therefore, the temperature of the cooling water is affected not only by the engine itself (such as speed, load) but also by the ambient temperature and the air conditioner condensation temperature. It is very difficult to accurately judge whether the cooling water temperature is normal.

[0004] The prior art simply judges the cooling water state by the cooling water temperature. When the cooling water temperature is too high, it first reduces the engine speed. If the water temperature continues to rise, it directly stops the engine. The prior art cannot play a role in protecting in advance and is prone to misjudgment, thus affecting the normal use of the air conditioner.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] An object of the present invention is to overcome the deficiencies in the prior art and provide a gas heat pump cooling water temperature detection system and a detection method to solve the problems that the related art cannot play a role in protecting in advance and is prone to misjudgment.

[0007] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0008] On the one hand, the present invention provides a gas heat pump cooling water temperature detection system, which includes a refrigeration system and a cooling water system. The refrigeration system includes a compressor, a condenser, a throttling component, and an evaporator that are connected in sequence to form a loop. The cooling water system includes an engine, a radiator, and a cooling water pump that are connected in sequence to form a loop. The compressor and the engine are connected by belt drive. A high-pressure sensor for detecting high-pressure is provided at the outlet of the compressor. An ambient temperature sensor for detecting ambient temperature is provided between the condenser and the radiator. A water temperature sensor for detecting the cooling water temperature is provided at the cooling water outlet of the engine.

[0009] Further, the engine gear is divided into 10 gears according to the engine speed.

[0010] Further, the condenser fan gear is divided into 10 gears according to the condenser fan speed.

[0011] On the other hand, the present invention provides a detection method for a gas heat pump cooling water temperature detection system, which is characterized by including:

[0012] Using a high-pressure sensor to detect high-pressure HP;

[0013] According to the detected high-pressure HP, obtain the corresponding condensation temperature Tc;

[0014] Using an ambient temperature sensor to detect ambient temperature To;

[0015] Using a water temperature sensor to detect the cooling water temperature Tw;

[0016] Calculate the target cooling water temperature Ta according to the ambient temperature To, the condensation temperature Tc, and the engine gear;

[0017] Compare the cooling water temperature Tw with the target cooling water temperature Ta. If Tw≥Ta + 10°C, then stop for protection;

[0018] If Ta + 10°C>Tw≥Ta + 5°C, then reduce the engine gear;

[0019] If Ta + 5°C>Tw≥Ta, then prompt that the cooling water is insufficient.

[0020] Further, if Tw≥Ta, then detect the condenser fan gear. If the condenser fan is less than 8 gears, then raise the condenser fan gear to 8 gears and above.

[0021] Further, if Tw<Ta, it means that the cooling water is sufficient and the gas heat pump is running normally.

[0022] Further, the calculation formula for the target cooling water temperature Ta is:

[0023] Ta = a * (Tc * b + 48)

[0024] In the formula, a is the ambient temperature coefficient. When To < 25°C, a = 0.95; when To < 30°C, a = 1; when To ≥ 30°C, a = 1.07. b is the engine output coefficient. When the engine gear < 6 gears, b = 0.9; when the engine gear < 8 gears, b = 0.95; when the engine gear ≥ 9 gears, b = 1.02.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0026] The detection system and method provided by the present invention can calculate different target cooling water temperatures according to different states of the gas heat pump unit, and can timely detect the problem of insufficient cooling water and provide corresponding prompts and protections. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a gas heat pump cooling water temperature detection system provided by an embodiment of the present invention;

[0028] Figure 2 is a logic diagram of a gas heat pump cooling water temperature detection method provided by an embodiment of the present invention;

[0029] Figure 3 is a table of the condensation temperature Tc corresponding to the high-pressure pressure HP provided by an embodiment of the present invention;

[0030] In the figure: 1: compressor; 2: condenser; 3: throttling component; 4: evaporator; 5: high-pressure sensor; 6: condensation fan; 7: ambient temperature sensor; 8: engine; 9: radiator; 10: cooling water pump; 11: water temperature sensor. Detailed Embodiments

[0031] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and should not be used to limit the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0034] Embodiment 1:

[0035] As Figure 1 shown, this embodiment provides a gas heat pump cooling water temperature detection system, including a refrigeration system and a cooling water system. The refrigeration system includes a compressor 1, a condenser 2, a throttling component 3, and an evaporator 4 that are connected in sequence to form a loop. The cooling water system includes an engine 8, a radiator 9, and a cooling water pump 10 that are connected in sequence to form a loop.

[0036] The compressor 1 and the engine 8 are connected by belt drive. A high-pressure sensor 5 for detecting high-pressure is provided at the outlet of the compressor 1. An ambient temperature sensor 7 for detecting ambient temperature is provided between the condenser 2 and the radiator 9. A water temperature sensor 11 for detecting the cooling water temperature is provided at the cooling water outlet of the engine 8.

[0037] In this embodiment, the gears of the engine 8 are divided into 10 gears according to the rotational speed of the engine 8.

[0038] Specifically, the rotational speeds of different engines 8 are different. If the rotational speed range of the engine 8 is 0 to 1000 revolutions per minute, then for the first gear it is 0 to 100 revolutions per minute, for the second gear it is 100 to 200 revolutions per minute, for the third gear it is 200 to 300 revolutions per minute, for the fourth gear it is 300 to 400 revolutions per minute, for the fifth gear it is 400 to 500 revolutions per minute, for the sixth gear it is 500 to 600 revolutions per minute, for the seventh gear it is 600 to 700 revolutions per minute, for the eighth gear it is 700 to 800 revolutions per minute, for the ninth gear it is 800 to 900 revolutions per minute, and for the tenth gear it is 900 to 1000 revolutions per minute.

[0039] In this embodiment, the 6 - gear positions of the condensation fan 6 are divided into 10 gears according to the rotational speed of the condensation fan 6.

[0040] Specifically, the rotational speeds of different condensation fans 6 are different. In this embodiment, the 6 - gear positions of the condensation fan 6 can be divided into 10 gears according to the rotational speed of the selected condensation fan 6. If the rotational speed range of the condensation fan 6 is 0 to 1000 revolutions per minute, then the first to tenth gears correspond to 0 to 100 / 100 to 200 / … / 900 to 1000 revolutions per minute. If the rotational speed range of the condensation fan 6 is 0 to 500, then the first to tenth gears correspond to 0 to 50 / 50 to 100 / … / 450 to 500 revolutions per minute, with each gear differing by 50 revolutions per minute.

[0041] Embodiment Two:

[0042] As Figure 2 shown, this embodiment provides a detection method for a gas - heat pump cooling water temperature detection system, including:

[0043] Using a high - pressure sensor to detect the high - pressure HP;

[0044] Based on the detected high - pressure HP, obtaining the corresponding condensation temperature Tc;

[0045] Specifically, referring to Figure 3 , obtaining the condensation temperature Tc corresponding to the detected high - pressure HP by querying a table;

[0046] Using an ambient temperature sensor to detect the ambient temperature To;

[0047] Using a water temperature sensor to detect the cooling water temperature Tw;

[0048] Based on the detected ambient temperature To, the condensation temperature Tc obtained from the table lookup, and the engine gear position viewed, calculating the target cooling water temperature Ta;

[0049] Specifically, the calculation formula for the target cooling water temperature Ta is:

[0050] Ta = a*(Tc*b + 48)

[0051] Wherein, a is the ambient temperature coefficient. When To < 25°C, a = 0.95; when To < 30°C, a = 1; when To ≥ 30°C, a = 1.07; b is the engine output coefficient. When the engine gear < 6, b = 0.9; when the engine gear < 8, b = 0.95; when the engine gear ≥ 9, b = 1.02;

[0052] Compare the cooling water temperature Tw with the target cooling water temperature Ta. If Tw ≥ Ta + 10°C, then detect the condenser fan gear. If the condenser fan gear < 8, then increase the condenser fan gear to 8 or above, and re-compare Tw ≥ Ta + 10°C. If Tw ≥ Ta + 10°C and the condenser fan gear ≥ 8, it means the cooling water temperature is too high. At this time, stop the machine to protect the gas heat pump;

[0053] If Ta + 10°C > Tw ≥ Ta + 5°C, then detect the condenser fan gear. If the condenser fan gear < 8, then increase the condenser fan gear to 8 or above, and re-compare Ta + 10°C > Tw ≥ Ta + 5°C. If Ta + 10°C > Tw ≥ Ta + 5°C and the condenser fan gear ≥ 8, then reduce the engine gear to reduce the engine speed, and re-detect the high-pressure pressure HP, ambient temperature To, engine gear, and cooling water temperature Tw;

[0054] Specifically, the engine gear can be set to decrease by 1 gear every N minutes according to the cooling water temperature.

[0055] If Ta + 5°C > Tw ≥ Ta, then detect the condenser fan gear. If the condenser fan gear < 8, then increase the condenser fan gear to 8 or above, and re-compare Ta + 5°C > Tw ≥ Ta. If Ta + 5°C > Tw ≥ Ta and the condenser fan gear ≥ 8, then prompt that the cooling water is insufficient, and re-detect the high-pressure pressure HP, ambient temperature To, engine gear, and cooling water temperature Tw;

[0056] If Tw < Ta, it means the cooling water is sufficient. At this time, the gas heat pump operates normally, and at the same time, re-detect the high-pressure pressure HP, ambient temperature To, engine gear, and cooling water temperature Tw to continue detecting the cooling water state.

[0057] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A detection method for a gas heat pump cooling water temperature detection system, the detection method being implemented based on the gas heat pump cooling water temperature detection system, characterized in that, The gas-fired heat pump cooling water temperature detection system includes a refrigeration system and a cooling water system. The refrigeration system includes a compressor (1), a condenser (2), a throttling component (3), and an evaporator (4) that are connected in sequence to form a loop. The cooling water system includes an engine (8), a radiator (9), and a cooling water pump (10) that are connected in sequence to form a loop. The compressor (1) and the engine (8) are connected by belt drive. A high-pressure sensor (5) for detecting high-pressure is provided at the outlet of the compressor (1). An ambient temperature sensor (7) for detecting ambient temperature is provided between the condenser (2) and the radiator (9). A water temperature sensor (11) for detecting the cooling water temperature is provided at the cooling water outlet of the engine (8). The refrigeration system further includes a condenser fan (6). The detection method includes using a high-pressure sensor to detect the high-pressure HP; Based on the detected high-pressure HP, the corresponding condensation temperature Tc is obtained; Using an ambient temperature sensor to detect the ambient temperature To; Using a water temperature sensor to detect the cooling water temperature Tw; Based on the ambient temperature To, the condensation temperature Tc, and the engine gear, the target cooling water temperature Ta is calculated; Compare the cooling water temperature Tw with the target cooling water temperature Ta. If Tw≥Ta + 10°C, then stop for protection; If Ta + 10°C > Tw≥Ta + 5°C, then reduce the engine gear; If Ta + 5°C > Tw≥Ta, then prompt that the cooling water is insufficient; The calculation formula for the target cooling water temperature Ta is: ； In the formula, a is the ambient temperature coefficient. When To < 25°C, a = 0.95; when 25°C≤To < 30°C, a = 1; when To≥30°C, a = 1.

07. b is the engine output coefficient. When the engine gear < 6 gears, b = 0.9; when 6 gears≤the engine gear < 8 gears, b = 0.95; when the engine gear≥9 gears, b = 1.

02.

2. The detection method of the cooling water temperature detection system of the gas heat pump according to claim 1, characterized in that, The engine (8) gear is divided into 10 gears according to the rotation speed of the engine (8).

3. The detection method of the cooling water temperature detection system of the gas heat pump according to claim 1, characterized in that The condenser fan (6) gear is divided into 10 gears according to the rotation speed of the condenser fan (6).

4. The detection method of the cooling water temperature detection system of the gas heat pump according to claim 3, characterized in that If Tw≥Ta, then detect the condenser fan gear. If the condenser fan < 8 gears, then raise the condenser fan gear to 8 gears and above.

5. The detection method of the cooling water temperature detection system of the gas heat pump according to claim 1, characterized in that, If Tw < Ta, it means that the cooling water is sufficient and the gas-fired heat pump is operating normally.

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