A novel engine cooling water system

Abstract

This utility model belongs to the field of gas-fired heat pump air conditioning technology and discloses a novel engine cooling water system. It includes a cooling water pump, an exhaust heat exchanger, an engine, a cooling water three-way valve, a plate heat exchanger, and the cooling water pump connected in sequence. One outlet of the cooling water three-way valve is sequentially connected to a cooling water-air heat exchanger assembly, the outlet of the plate heat exchanger, or the inlet of the cooling water pump. The cooling water-air heat exchanger assembly includes cooling water-air heat exchanger A and cooling water-air heat exchanger B. An expansion tank is connected to the outlet of the cooling water-air heat exchanger assembly via a pipeline. This novel engine cooling water system effectively recovers the cylinder liner waste heat and exhaust waste heat of the gas engine in a gas-fired heat pump air conditioner, and recycles and utilizes this heat during heating.

Description

Technical Field

[0001] This utility model belongs to the field of gas heat pump air conditioning technology, and relates to a novel engine cooling water system. Background Technology

[0002] Gas-fired heat pump air conditioners use a gas engine to drive a compressor to operate the refrigerant system. When the engine is running, it generates a lot of heat. In order to ensure the continuous operation of the engine, this heat is released into the air. This not only causes a lot of heat loss during heating and reduces the overall operating efficiency of the unit, but if this heat is not released sufficiently, it will also affect the service life of the engine or even damage the engine. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings in the above-mentioned background technology and provide a new type of engine cooling water system. This new engine cooling water system can effectively recover the cylinder liner waste heat and exhaust waste heat of the gas engine in the gas heat pump air conditioner, and recover and utilize the above heat during heating.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a novel engine cooling water system, comprising a cooling water pump, an exhaust heat exchanger, an engine, a cooling water three-way valve, a plate heat exchanger, and a cooling water pump connected in sequence; one outlet of the cooling water three-way valve is connected in sequence to the outlet of a cooling water-air heat exchanger assembly, the plate heat exchanger, or the inlet of the cooling water pump; the cooling water-air heat exchanger assembly includes a cooling water-air heat exchanger A and a cooling water-air heat exchanger B; an expansion tank is connected to the outlet of the cooling water-air heat exchanger assembly via a pipeline.

[0005] A fan is installed between cooling water-air heat exchanger A and cooling water-air heat exchanger B. Cooling water-air heat exchanger A and cooling water-air heat exchanger B are connected in parallel and are located on both sides of the fan.

[0006] The cooling water pump is connected to the cooling water inlet of the exhaust heat exchanger, and the outlet of the exhaust heat exchanger is connected to the cooling water inlet of the engine.

[0007] The engine's cooling water outlet is connected to the inlet of the cooling water three-way valve; the other outlet of the cooling water three-way valve is connected to the inlet of the plate heat exchanger, and the outlet of the plate heat exchanger is connected to the inlet of the cooling water pump.

[0008] One outlet of the cooling water three-way valve is connected to the inlet of cooling water air heat exchanger A and cooling water air heat exchanger B in the cooling water air heat exchanger group via a pipeline.

[0009] The outlets of cooling water-air heat exchanger A and cooling water-air heat exchanger B are connected to the outlet of the plate heat exchanger.

[0010] A temperature sensor is installed on the pipeline connecting the engine and the cooling water three-way valve. Preferably, a temperature sensor is installed on the pipeline between the cooling water three-way valve and the engine's cooling water outlet.

[0011] An expansion valve is installed at the refrigerant side inlet of the plate heat exchanger.

[0012] The fan is equipped with a fan motor. The preferred fan model is SAN-GF20, and the preferred fan motor model is NPMTS-DN1623(*00).

[0013] The advantages of this invention compared to existing technologies are as follows: The novel engine cooling water system provided by this invention effectively recovers and utilizes the aforementioned heat during heating. This significantly improves the overall operating efficiency of the engine and prevents frost formation during heating, eliminating the need for reverse circulation defrosting. While improving overall engine operating efficiency, it also ensures user comfort. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of a novel engine cooling water system according to this utility model.

[0016] In the diagram: 1. Engine, 2. Exhaust heat exchanger, 3. Cooling water pump, 4. Plate heat exchanger, 5. Cooling water three-way valve, 6. Cooling water-air heat exchanger A, 7. Cooling water-air heat exchanger B, 8. Expansion tank, 9. Expansion valve, 10. Fan, 11. Temperature sensor. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. Unless otherwise specified, the embodiments described herein involve connections achieved through pipes or conduits or existing technologies.

[0018] The engine cooling water system includes functions such as circulating cooling water through a cooling water pump, recovering waste heat from exhaust gas through an exhaust heat exchanger, recovering residual heat from the cooling water through a plate heat exchanger during heating, releasing excess heat into the air through a cooling water-air heat exchanger, switching the cooling water flow loop through a cooling water three-way valve, and replenishing exhaust gas and cooling water through an expansion tank.

[0019] Example 1

[0020] A new type of engine cooling water system, such as Figure 1As shown, the system includes a cooling water pump 3, an exhaust heat exchanger 2, an engine 1, a cooling water three-way valve 5, a plate heat exchanger 4, and the cooling water pump 3 connected in sequence. One outlet of the cooling water three-way valve 5 is connected in sequence to the outlet of the cooling water-air heat exchanger group, the plate heat exchanger 4, or the inlet of the cooling water pump 3. The cooling water-air heat exchanger group includes a cooling water-air heat exchanger A6 and a cooling water-air heat exchanger B7, which are connected in parallel and placed on both sides of the fan 10. The cooling water-air heat exchangers A6 and B7 need to be installed adjacent to the fan 10. An expansion tank 8 is connected to the outlet of the cooling water-air heat exchanger group via a pipeline.

[0021] The cooling water pump 3 is connected to the cooling water inlet of the exhaust heat exchanger 2, and the outlet of the exhaust heat exchanger 2 is connected to the cooling water inlet of the engine 1.

[0022] The cooling water outlet of the engine 1 is connected to the inlet of the cooling water three-way valve 5; the other outlet of the cooling water three-way valve 5 is connected to the inlet of the plate heat exchanger 4, and the outlet of the plate heat exchanger 4 is connected to the inlet of the cooling water pump 3.

[0023] One outlet of the cooling water three-way valve 5 is connected to the inlet of the cooling water air heat exchanger A6 and the cooling water air heat exchanger B7 in the cooling water air heat exchanger group via a pipeline.

[0024] The outlets of cooling water-air heat exchanger A6 and cooling water-air heat exchanger B7 are connected to the outlet of plate heat exchanger 4.

[0025] A temperature sensor 11 is provided on the pipeline connecting the engine 1 and the cooling water three-way valve 5. Preferably, a temperature sensor 11 is provided on the pipeline between the cooling water three-way valve 5 and the cooling water outlet of the engine 1.

[0026] An expansion valve 9 is installed at the refrigerant side inlet of the plate heat exchanger 4.

[0027] Fan 10 is equipped with a fan motor. The preferred fan model is SAN-GF20, and the preferred fan motor model is NPMTS-DN1623(*00).

[0028] Cooling water air heat exchanger B7 and cooling water air heat exchanger A6 exchange heat with air through the operation of fan 10 and fan motor.

[0029] The cooling water is pumped by cooling water pump 3, passes through exhaust heat exchanger 2, and then enters engine 1 for heat exchange.

[0030] The plate heat exchanger 4 has a counter-current heat exchange between the refrigerant side and the cooling water side.

[0031] Example 2

[0032] Circuit selection for the cooling water three-way valve 5 described in Example 1:

[0033] When the cooling water temperature is <80℃; the connecting pipe from the cooling water three-way valve 5 to the plate heat exchanger 4 is opened through the cooling water three-way valve 5, and the connecting pipe from the cooling water three-way valve 5 to the air heat exchanger is closed through the cooling water three-way valve 5.

[0034] When the cooling water temperature is ≥80℃; the connecting pipeline from the cooling water three-way valve 5 to the plate heat exchanger 4 is closed by the cooling water three-way valve 5, and the connecting pipeline from the cooling water three-way valve 5 to the air heat exchanger is opened by the cooling water three-way valve 5.

[0035] The cooling water temperature is measured by a temperature sensor 11 located between the cooling water three-way valve 5 and the cooling water outlet of engine 1.

[0036] Example 3

[0037] The operation settings of the expansion valve 9 described in Example 1 are as follows:

[0038] When the gas-fired heat pump air conditioner is cooling, expansion valve 9 is closed;

[0039] When the gas heat pump air conditioner is in heating mode, the expansion valve 9 opens and the opening degree is adjusted according to the demand load and cooling water temperature.

[0040] The cooling water temperature is measured by a temperature sensor 11 located between the cooling water three-way valve 5 and the cooling water outlet of engine 1.

[0041] Circulation: Cooling water is circulated by cooling water pump 3, and the cooling water flows sequentially through engine 1, exhaust heat exchanger 2, cooling water air heat exchanger or plate heat exchanger 4;

[0042] Loop switching: Temperature sensor 11 detects the temperature of the cooling water and switches the cooling water flow pipeline loop according to the actual temperature through cooling water three-way valve 5;

[0043] Exhaust and cooling water replenishment: The expansion tank 8 is used to exhaust the cooling water system and also to replenish the cooling water.

[0044] Heat recovery: Cooling water recovers waste heat from the engine cylinder liner and exhaust gas. During heating, heat from the cooling water system is recovered through plate heat exchanger 4. The recovered heat is controlled by expansion valve 9, ultimately achieving effective recovery and utilization of the above heat during heating. This significantly improves the overall operating efficiency of the machine and avoids frosting during heating, eliminating the need for reverse circulation defrosting. It improves overall operating efficiency while ensuring user comfort.

[0045] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A novel engine cooling water system characterized by, The system includes a cooling water pump (3), an exhaust heat exchanger (2), an engine (1), a cooling water three-way valve (5), a plate heat exchanger (4), and a cooling water pump (3) connected in sequence. One outlet of the cooling water three-way valve (5) is connected in sequence to the outlet of the cooling water-air heat exchanger group, the plate heat exchanger (4), or the inlet of the cooling water pump (3). The cooling water-air heat exchanger group includes a cooling water-air heat exchanger A (6) and a cooling water-air heat exchanger B (7). An expansion tank (8) is connected to the outlet of the cooling water-air heat exchanger group via a pipeline. One outlet of the cooling water three-way valve (5) is connected to the inlet of the cooling water air heat exchanger A (6) and the cooling water air heat exchanger B (7) in the cooling water air heat exchanger group through a pipeline; The cooling water outlet of the engine (1) is connected to the inlet of the cooling water three-way valve (5); the other outlet of the cooling water three-way valve (5) is connected to the inlet of the plate heat exchanger (4), and the outlet of the plate heat exchanger (4) is connected to the inlet of the cooling water pump (3).

2. A novel engine cooling water system as claimed in claim 1, characterized in that, The cooling water pump (3) is connected to the cooling water inlet of the exhaust heat exchanger (2), and the outlet of the exhaust heat exchanger (2) is connected to the cooling water inlet of the engine (1).

3. A novel engine cooling water system as claimed in claim 1, wherein, The cooling water-air heat exchanger A (6) and cooling water-air heat exchanger B (7) are connected in parallel and placed on both sides of the fan (10). The cooling water-air heat exchanger A (6) and cooling water-air heat exchanger B (7) need to be placed adjacent to the fan (10).

4. A novel engine cooling water system as claimed in claim 1, wherein, The outlets of cooling water-air heat exchanger A (6) and cooling water-air heat exchanger B (7) are connected to the outlet of plate heat exchanger (4).

5. A novel engine cooling water system as claimed in claim 1, wherein, A temperature sensor (11) is installed on the pipeline connecting the engine (1) and the cooling water three-way valve (5).

6. A novel engine cooling water system as claimed in claim 1, wherein, A temperature sensor (11) is installed on the pipeline between the cooling water three-way valve (5) and the cooling water outlet of the engine (1).

7. A novel engine cooling water system as described in claim 1, characterized in that, An expansion valve (9) is installed at the refrigerant side inlet of the plate heat exchanger (4).

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