Low-temperature gas engine with preheating function

Abstract

The application relates to the technical field of engines and discloses a low-temperature gas engine with a preheating function, which comprises a heating water tank, an electric heating pipe and a cooling liquid pipe are arranged in the heating water tank, a first liquid inlet pipe and a first liquid outlet pipe are fixedly connected to the rear side of the heating water tank, a circulating pump is connected to the end of the first liquid inlet pipe away from the heating water tank, a second liquid inlet pipe is fixedly connected to the outer side of the circulating pump, and a circulating pipe is fixedly connected to the end of the first liquid outlet pipe away from the heating water tank. The second liquid inlet pipe can be connected to the circulating pipe to build a complete and closed cooling liquid circulating channel, the second liquid outlet pipe can realize smooth flow of the heated cooling liquid between the heating water tank and the engine body, the preheated cooling liquid can be quickly delivered to each part of the engine, preheating of the engine is completed, and problems such as uneven local heating and insufficient preheating caused by poor delivery of the cooling liquid are avoided.

Description

Technical Field

[0001] This invention relates to the field of engine technology, specifically to a low-temperature gas engine with a preheating function. Background Technology

[0002] When a gas-fired engine starts in low-temperature environments, the extremely low coolant temperature leads to difficulty in starting, prolonged starting time, and poor lubrication of internal engine components, causing wear on critical parts such as pistons and crankshafts, thus reducing engine lifespan. Furthermore, the poor fluidity of coolant at low temperatures prevents the rapid and uniform preheating of engine components, further impacting starting performance and operational stability. Therefore, there is an urgent need for a low-temperature gas-fired engine with a simple structure, precise heating, and reliable efficiency, equipped with a preheating function, to solve these technical challenges.

[0003] According to a search, Chinese patent document CN110159473A discloses an engine preheating system. This system uses an electrically controlled water pump, a cylinder liner preheating hot water inlet, and a cylinder liner preheating hot water outlet to form a circulating water circuit. A heating unit, including a water heat exchanger, is installed on the connecting pipe between the electrically controlled water pump and the cylinder liner preheating hot water inlet. The water heat exchanger is connected to an external hot water source, which can be a free or low-cost heat source, such as municipal hot water or boiler heating water. This system can maintain the engine temperature in low-temperature environments and effectively reduce operating costs. However, in actual use, this device lacks a dedicated coolant preheating mechanism, and its external hot water source structure is complex and has low heating efficiency. It cannot accurately heat the coolant to the preset temperature, and the heating time is difficult to control within a reasonable range, failing to meet the requirements for rapid and stable engine starting in low-temperature environments. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a low-temperature gas engine with a preheating function, which has the advantages of ensuring smooth engine start-up, precise preheating of coolant, and improved heating efficiency, thus solving the aforementioned technical problems.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature gas engine with preheating function, comprising a heating water tank, wherein an electric heating tube and a coolant tube are installed inside the heating water tank, a first inlet pipe and a first outlet pipe are fixedly connected to the rear side of the heating water tank, a circulation pump is fixedly connected to the end of the first inlet pipe away from the heating water tank, a second inlet pipe is fixedly connected to the outer side of the circulation pump, and a circulation tube is fixedly connected to the end of the first outlet pipe away from the heating water tank.

[0008] Preferably, the coolant pipe is installed inside the heating water tank in a reciprocating bending shape, and the end of the coolant pipe near the left side of the heating water tank is connected to the inside of the first inlet pipe, and the end of the coolant pipe near the right side of the heating water tank is connected to the inside of the first outlet pipe.

[0009] Through the above technical solution, the coolant pipe can significantly extend the flow path and residence time of the coolant in the heater tank, greatly increasing the contact area between the coolant and the heating medium in the heater tank, ensuring uniform heating of the coolant, improving preheating efficiency, and accurately achieving the preset requirement of heating the coolant to above 30°C and controlling the heating time to about 15 minutes when the ambient temperature is below 10°C. At the same time, the reciprocating bending arrangement allows for reasonable planning of the pipeline in a limited space, achieving efficient heating without increasing the volume of the heater tank, with a compact structure and saving installation space. In addition, through the connection of the first inlet pipe and the first outlet pipe, the coolant can smoothly enter and exit and circulate between the heater tank and the engine pipeline, ensuring that the preheated coolant can be quickly and stably delivered to the engine body, ensuring smooth engine start at low temperatures, reducing component start-up wear, and also facilitating coolant replenishment and replacement, improving the operational stability and practicality of the entire preheating system.

[0010] Preferably, the left end of the circulation pipe is fixedly connected to the outer side of the second inlet pipe, and the outer side of the circulation pipe is fixedly connected to the second outlet pipe.

[0011] Through the above technical solution, the circulation pipe connected to the second inlet pipe can form a complete and closed coolant circulation path, while the second outlet pipe can realize the smooth flow of heated coolant between the water tank and the engine block, ensuring that the preheated coolant can be quickly delivered to all parts of the engine to complete the preheating of the engine and avoid problems such as uneven local heating and insufficient preheating caused by poor coolant delivery.

[0012] Preferably, an electrically controlled valve is installed on the outer surface of the second inlet pipe, the circulation pipe, and the second outlet pipe.

[0013] Through the above technical solutions, the electronically controlled valve can achieve precise control and flexible adjustment of coolant delivery. It can flexibly switch the on / off state of coolant according to engine operating conditions and ambient temperature, and can also accurately regulate coolant flow to ensure flow matching during preheating, normal circulation and shutdown phases. At the same time, it can work with the automated control system to achieve synchronous linkage of the electronically controlled valve, flexibly adjust the valve opening and closing status, prevent ineffective coolant supply during irrelevant periods, facilitate precise control of the start and stop of the preheating cycle and the running rhythm, avoid abnormal pressure in the pipeline, reduce equipment wear, and improve the stability and automation of system operation.

[0014] Preferably, there are two electric heating tubes, and the two electric heating tubes are symmetrically installed inside the heating water tank.

[0015] Through the above technical solution, the two electric heating tubes can make the medium inside the heating tank more evenly heated, avoid local overheating or heating blind spots, improve preheating efficiency and temperature consistency, ensure stable and reliable heating, and also achieve redundancy backup. Even if a single electric heating tube fails, it can still maintain basic heating function, ensure low-temperature start-up and normal operation of the engine, and the symmetrical structure facilitates installation layout and heat dissipation balance.

[0016] Preferably, a first temperature sensor is fixedly installed inside the heating water tank, and a second temperature sensor is fixedly installed on the outer side of the first liquid outlet pipe.

[0017] Through the above technical solution, the first temperature sensor and the second temperature sensor can achieve dual monitoring of the temperature of the medium inside the heating water tank and the temperature of the coolant inside the first outlet pipe. This can not only accurately control the heating temperature inside the heating water tank to prevent overheating or insufficient heating, but also monitor the actual temperature of the coolant entering the engine in real time, ensuring that the preheating temperature meets the requirements for low-temperature start-up, improving the system control accuracy and operational reliability, and effectively ensuring the engine's safe start-up and stable preheating at low temperatures.

[0018] Preferably, the input shaft of the circulating pump is fixedly connected to a synchronous pulley, and the outer surface of the synchronous pulley is connected to a synchronous belt.

[0019] The above technical solution connects the synchronous belt to components such as the engine crankshaft, allowing the crankshaft's power to directly drive the circulating pump without the need for an additional independent drive motor. This simplifies the overall device structure and reduces manufacturing costs and energy consumption. Simultaneously, the synchronous belt provides cushioning and shock absorption, effectively absorbing vibrations generated during crankshaft operation and preventing their transmission to the circulating pump, thus protecting its internal components and extending its lifespan. Furthermore, the synchronous belt drive allows for speed adaptation, rationally matching the transmission ratio based on the crankshaft speed and circulating pump requirements to ensure stable output flow and pressure, adapting to the coolant circulation needs under different engine operating conditions. The synchronous belt drive also features a simple structure, convenient installation and maintenance, and facilitates future inspection and replacement.

[0020] Preferably, the top surface of the heating water tank is provided with a water inlet and a vent.

[0021] Through the above technical solution, the water inlet can be directly replenished when the medium is insufficient, ensuring a stable liquid level in the heating water tank and avoiding damage to the heating element due to lack of liquid; at the same time, the vent can promptly discharge the air and steam generated during the heating process, eliminating air blockage, preventing excessive pressure in the tank from causing leakage or deformation, and improving the operational stability and safety of the preheating system.

[0022] Compared with the prior art, the present invention provides a low-temperature gas engine with preheating function, which has the following beneficial effects:

[0023] 1. This invention establishes a complete and closed coolant circulation path by connecting a second inlet pipe to a circulation pipe, while the second outlet pipe ensures smooth flow of heated coolant between the heater tank and the engine block. This guarantees that the preheated coolant can be quickly delivered to all parts of the engine to preheat it, avoiding problems such as uneven heating and insufficient preheating caused by poor coolant delivery. The electronically controlled valve enables precise control and flexible adjustment of coolant delivery. It can flexibly switch the coolant flow based on engine operating conditions and ambient temperature, and precisely regulate the coolant flow rate to ensure flow matching during preheating, normal circulation, and shutdown phases. Furthermore, it can work in conjunction with an automated control system to achieve synchronous linkage of the electronically controlled valve, flexibly adjusting the valve's on / off state to prevent ineffective coolant supply during irrelevant periods. This facilitates precise control of the start / stop and operation rhythm of the preheating circulation, preventing abnormal pressure within the pipeline, reducing equipment wear, and improving system stability and automation.

[0024] 2. This invention connects a synchronous belt to components such as the engine crankshaft, allowing the crankshaft's power to directly drive the circulating pump without the need for an additional independent drive motor. This simplifies the overall device structure and reduces manufacturing costs and energy consumption. Simultaneously, the synchronous belt provides cushioning and shock absorption, effectively absorbing vibrations generated during crankshaft operation and preventing their transmission to the circulating pump, thus protecting internal components and extending their lifespan. Furthermore, the synchronous belt drive allows for speed adaptation, rationally matching the transmission ratio based on the crankshaft speed and circulating pump requirements to ensure stable output flow and pressure, adapting to the coolant circulation needs under different engine operating conditions. The synchronous belt drive structure is simple, easy to install and maintain, and facilitates future inspection and replacement. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a front cross-sectional view of the heating water tank and other parts of the present invention.

[0027] Figure 3 This is a three-dimensional exploded cross-sectional view of the heating water tank and other parts of the present invention.

[0028] Figure 4 This is a three-dimensional schematic diagram of the circulating pipe and other components of the present invention;

[0029] Figure 5 This is a three-dimensional cross-sectional view of the components such as the first liquid inlet pipe of the present invention.

[0030] The components include: 1. Heating water tank; 2. Electric heating element; 3. Coolant pipe; 4. First inlet pipe; 5. First outlet pipe; 6. Circulation pump; 7. Second inlet pipe; 8. Circulation pipe; 9. Second outlet pipe; 10. Electric control valve; 11. First temperature sensor; 12. Second temperature sensor; 13. Synchronous pulley; 14. Synchronous belt; 15. Water inlet; 16. Vent. Detailed Implementation

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

[0032] Please see Figure 1-5 A low-temperature gas engine with preheating function includes a heating water tank 1. An electric heating tube 2 and a coolant tube 3 are installed inside the heating water tank 1. A first inlet tube 4 and a first outlet tube 5 are fixedly connected to the rear side of the heating water tank 1. A circulation pump 6 is fixedly connected to the end of the first inlet tube 4 away from the heating water tank 1. A second inlet tube 7 is fixedly connected to the outer side of the circulation pump 6. A circulation tube 8 is fixedly connected to the end of the first outlet tube 5 away from the heating water tank 1.

[0033] Specifically, the coolant pipe 3 is installed inside the heating water tank 1 in a reciprocating bend shape, and the end of the coolant pipe 3 near the left side of the heating water tank 1 is connected to the inside of the first inlet pipe 4, and the end of the coolant pipe 3 near the right side of the heating water tank 1 is connected to the inside of the first outlet pipe 5. The advantages are that this structure of the coolant pipe 3 can significantly extend the flow path and residence time of the coolant in the heating tank 1, greatly increasing the contact area between the coolant and the heating medium in the heating tank 1, ensuring uniform heating of the coolant, improving preheating efficiency, and accurately achieving the preset requirement of heating the coolant to above 30°C and controlling the heating time to about 15 minutes when the ambient temperature is below 10°C; at the same time, the reciprocating bending arrangement can rationally plan the pipeline in a limited space, achieving efficient heating without increasing the volume of the water tank, with a compact structure and saving installation space; in addition, through the connection of the first inlet pipe 4 and the first outlet pipe 5, the coolant can smoothly enter and exit and circulate between the heating tank 1 and the engine pipeline, ensuring that the preheated coolant can be quickly and stably delivered to the engine body, ensuring smooth engine start at low temperatures, reducing component start-up wear, and also facilitating coolant replenishment and replacement, improving the operational stability and practicality of the entire preheating system.

[0034] Specifically, the left end of the circulation pipe 8 is fixedly connected to the outer surface of the second inlet pipe 7, and the outer surface of the circulation pipe 8 is fixedly connected to the second outlet pipe 9. The advantage is that this structure, connecting the circulation pipe 8 to the second inlet pipe 7, creates a complete and closed coolant circulation path. The second outlet pipe 9 allows for smooth flow of the heated coolant between the water tank 1 and the engine block, ensuring that the preheated coolant can be quickly delivered to all parts of the engine to preheat it, avoiding problems such as uneven heating and insufficient preheating caused by poor coolant delivery.

[0035] Specifically, an electronically controlled valve 10 is installed on the outer surface of the second inlet pipe 7, the circulation pipe 8, and the second outlet pipe 9. The advantage is that this structure allows for precise control and flexible adjustment of the coolant supply. It can flexibly switch the coolant flow based on engine operating conditions and ambient temperature, while also precisely controlling the coolant flow rate to ensure flow matching during preheating, normal circulation, and shutdown phases. Furthermore, it can work in conjunction with an automated control system to achieve synchronous linkage of the electronically controlled valve 10, flexibly adjusting the valve's on / off state to prevent ineffective coolant supply during irrelevant periods. This facilitates precise control of the start / stop and operating rhythm of the preheating circulation, avoids abnormal pressure within the pipeline, reduces equipment wear, and improves system stability and automation.

[0036] Specifically, there are two electric heating elements 2, which are symmetrically installed inside the heating water tank 1. The advantages are that this structure allows for more uniform heating of the medium inside the heating water tank 1, avoiding localized overheating or heating blind spots, improving preheating efficiency and temperature consistency, ensuring stable and reliable heating, and providing redundancy backup. Even if one electric heating element 2 fails, basic heating functions can still be maintained, ensuring low-temperature engine start-up and normal operation. Furthermore, the symmetrical structure facilitates installation layout and heat dissipation balance.

[0037] Specifically, a first temperature sensor 11 is fixedly installed inside the heating water tank 1, and a second temperature sensor 12 is fixedly installed on the outer side of the first outlet pipe 5. The advantage is that this structure allows for dual monitoring of the temperature of the medium inside the heating water tank 1 and the coolant inside the first outlet pipe 5. This enables precise control of the heating temperature inside the heating water tank 1, preventing overheating or underheating, and also allows for real-time monitoring of the actual temperature of the coolant entering the engine, ensuring that the preheating temperature meets the requirements for low-temperature starts. This improves system control accuracy and operational reliability, effectively guaranteeing safe engine start-up and stable preheating at low temperatures.

[0038] Specifically, the input shaft of the circulating pump 6 is fixedly connected to a synchronous pulley 13, and a synchronous belt 14 is driven to the outer side of the synchronous pulley 13. The advantages are: this structure connects the synchronous belt 14 to components such as the engine crankshaft, allowing the circulating pump 6 to be directly driven by the engine crankshaft's power, eliminating the need for an independent drive motor, simplifying the overall device structure, and reducing equipment manufacturing costs and energy consumption; simultaneously, the synchronous belt 14 provides a certain degree of buffering and shock absorption, effectively absorbing vibrations generated during crankshaft operation and preventing vibration transmission to the circulating pump 6, protecting the internal components of the circulating pump 6 and extending its service life; furthermore, the synchronous belt 14 transmission allows for certain speed adaptation, rationally matching the transmission ratio according to the crankshaft speed and the requirements of the circulating pump 6, ensuring stable output flow and pressure of the circulating pump 6, adapting to the coolant circulation requirements under different engine operating conditions, and the synchronous belt 14 transmission structure is simple, easy to install and maintain, and convenient for later inspection and replacement.

[0039] Specifically, the top surface of the heating water tank 1 is provided with a water inlet 15 and a vent 16. The advantage is that the water inlet 15 facilitates direct replenishment when the medium is insufficient, ensuring a stable liquid level in the heating water tank 1 and preventing damage to the heating element due to insufficient liquid. At the same time, the vent 16 can promptly discharge the air and steam generated during the heating process, eliminating air blockage and preventing excessive pressure inside the tank from causing leakage or deformation, thereby improving the operational stability and safety of the preheating system.

[0040] In use, connecting the circulation pipe 8 to the second inlet pipe 7 creates a complete and closed coolant circulation path, while the second outlet pipe 9 ensures smooth flow of heated coolant between the heater tank 1 and the engine block, guaranteeing rapid delivery of preheated coolant to all parts of the engine for preheating and preventing uneven heating and insufficient preheating due to poor coolant delivery. The electronically controlled valve 10 allows for precise control and flexible adjustment of coolant delivery, enabling flexible switching of coolant flow based on engine operating conditions and ambient temperature. It can precisely control the coolant flow rate, ensuring flow matching during preheating, normal circulation, and shutdown phases. Simultaneously, it can work with the automated control system to achieve synchronous linkage of the electrically controlled valve 10, flexibly adjusting the valve's on / off state to prevent ineffective coolant supply during irrelevant periods. This facilitates precise control of the preheating cycle's start / stop and operating rhythm, avoiding abnormal pressure within the pipeline, reducing equipment wear, and improving system stability and automation. The two electric heating tubes 2 ensure more uniform heating of the medium inside the heating tank 1, preventing localized overheating or heating blind spots, improving preheating efficiency and temperature consistency, and ensuring stable heating. The system is reliable; through the first temperature sensor 11 and the second temperature sensor 12, dual monitoring of the temperature of the medium inside the heating water tank 1 and the coolant inside the first outlet pipe 5 can be achieved. This can accurately control the heating temperature inside the heating water tank 1 to prevent overheating or underheating, and can also monitor the actual temperature of the coolant entering the engine in real time to ensure that the preheating temperature meets the requirements for low-temperature start-up, thereby improving the system control accuracy and operational reliability. By connecting the synchronous belt 14 to the engine crankshaft and other parts, the power of the engine crankshaft can directly drive the circulation pump 6, eliminating the need for an additional independent drive motor, simplifying the overall device structure, and reducing equipment manufacturing costs and energy consumption. At the same time, the synchronous belt 14 has a certain buffering and shock absorption effect, which can effectively absorb the vibration generated during the operation of the crankshaft and prevent the vibration from being transmitted to the circulation pump 6, protecting the internal components of the circulation pump 6 and extending its service life. In addition, the synchronous belt 14 transmission can achieve a certain speed adaptation. The transmission ratio can be reasonably matched according to the crankshaft speed and the needs of the circulation pump 6 to ensure stable output flow and pressure of the circulation pump 6, adapting to the coolant circulation needs under different engine operating conditions. Moreover, the synchronous belt 14 transmission structure is simple, easy to install and maintain, and convenient for later inspection and replacement.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cryogenic gas engine with preheating function, comprising a heating water tank (1), characterized in that: The heating water tank (1) is equipped with an electric heating tube (2) and a coolant tube (3). The rear side of the heating water tank (1) is fixedly connected to a first inlet tube (4) and a first outlet tube (5). The end of the first inlet tube (4) away from the heating water tank (1) is fixedly connected to a circulation pump (6). The outer side of the circulation pump (6) is fixedly connected to a second inlet tube (7). The end of the first outlet tube (5) away from the heating water tank (1) is fixedly connected to a circulation tube (8).

2. A cryogenic gas engine with preheating function according to claim 1, characterized in that: The coolant pipe (3) is installed inside the heating water tank (1) in a reciprocating bending shape, and the end of the coolant pipe (3) near the left side of the heating water tank (1) is connected to the inside of the first inlet pipe (4), and the end of the coolant pipe (3) near the right side of the heating water tank (1) is connected to the inside of the first outlet pipe (5).

3. A low-temperature gas engine with preheating function according to claim 1, characterized in that: The left end of the circulation pipe (8) is fixedly connected to the outer side of the second inlet pipe (7), and the outer side of the circulation pipe (8) is fixedly connected to the second outlet pipe (9).

4. A cryogenic gas engine with preheating function according to claim 3, characterized in that: An electric control valve (10) is installed on the outer side of the second inlet pipe (7), the circulation pipe (8) and the second outlet pipe (9).

5. A cryogenic gas engine with preheating function according to claim 1, characterized in that: The number of electric heating tubes (2) is set to two, and the two electric heating tubes (2) are symmetrically installed inside the heating water tank (1).

6. A cryogenic gas engine with preheating function according to claim 1, characterized in that: The heating water tank (1) is fixedly installed with a first temperature sensor (11) inside, and the first liquid outlet pipe (5) is fixedly installed with a second temperature sensor (12) on its outer side.

7. A cryogenic gas engine with preheating function according to claim 1, characterized in that: The input shaft of the circulating pump (6) is fixedly connected to a synchronous pulley (13), and the outer side of the synchronous pulley (13) is connected to a synchronous belt (14).

8. A cryogenic gas engine with preheating function according to claim 1, characterized in that: The top surface of the heating water tank (1) is provided with a water inlet (15) and an exhaust vent (16).

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