A segmented adjustable EGR cooler system

Abstract

The present invention provides a segmented adjustable EGR cooler system, comprising a shell, one end of the shell is fixedly connected to a reducer, the end of the reducer away from the shell is equipped with a hollow tube, the end of the hollow tube away from the reducer is fixedly connected to a connecting seat, a tubular cooler is installed on the side of the shell close to the reducer, a plate cooler is installed on the side away from the reducer, a bypass pipe is provided on one side of the plate cooler, the bypass pipe is arranged in the shell, an EGR valve for switching the bypass pipe and the plate cooler is installed on the end of the shell away from the reducer, and an air outlet is installed on the end of the EGR valve away from the shell. Compared with the prior art, the present invention has the following beneficial effects: outlet temperature adjustment function to meet the exhaust gas recirculation intake requirements under different working conditions, and the segmented design can effectively reduce thermal shock to the plate cooler and reduce thermal stress.

Description

Technical Field

[0001] The invention discloses a segmented adjustable EGR cooler system, belonging to the technical field of engine exhaust treatment. Background Art

[0002] The basic principle of exhaust gas recirculation (EGR) technology is to introduce part of the exhaust gas into the intake pipe to increase the exhaust gas composition in the mixed gas. Since the exhaust gas contains triatomic molecules such as water vapor and carbon dioxide, the triatomic molecules have a large specific heat, which effectively reduces the maximum combustion temperature in the cylinder, thereby reducing NOx emissions. However, directly sending the exhaust gas into the intake pipe will increase the intake temperature, resulting in reduced charging efficiency and worse fuel economy, so the exhaust gas must be cooled before being introduced into the intake system.

[0003] At present, the EGR cooler system often uses a single plate cooler for cooling. The EGR rate is controlled by controlling the EGR valve to adjust the amount of exhaust gas entering the engine. The exhaust gas temperature cannot be adjusted according to the working conditions. The high-temperature exhaust gas discharged from the engine directly impacts the plate cooler, causing the plate cooler to be subjected to a large thermal shock and easily damaged due to large thermal stress. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a segmented adjustable EGR cooler system to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a segmented adjustable EGR cooler system, including a shell, one end of the shell is fixedly connected to a reducer, the end of the reducer away from the shell is equipped with a hollow tube, the end of the hollow tube away from the reducer is fixedly connected to a connecting seat, and three mounting holes are evenly arranged on a side of the connecting seat facing the reducer, a tubular cooler is installed on the side of the shell close to the reducer, and a plate cooler is installed on the side away from the reducer, a bypass pipe is provided on one side of the plate cooler, and the bypass pipe is arranged in the shell, an EGR valve for switching the bypass pipe and the plate cooler is installed on the end of the shell away from the reducer, and an air outlet is installed on the end of the EGR valve away from the shell.

[0006] Furthermore, a cover shell for hiding the connecting seat is sleeved on the hollow tube, and the cover shell is slidably connected to the hollow tube. Two cylindrical bodies are symmetrically installed at one end of the shell close to the reducer, and the cylindrical bodies are arranged along the length direction of the shell. A first piston and a second piston are slidably installed in the cylindrical body, and a certain distance is maintained between the first piston and the second piston. A threaded rod is rotatably connected to the middle position of a side of the first piston facing away from the second piston, and one end of the threaded rod extends to the outside of the cylindrical body away from the first piston and is threadedly connected to the cylindrical body. A pressure rod is fixed to the middle position of a side of the second piston facing away from the first piston, and one end of the pressure rod extends to the outside of the cylindrical body away from the second piston and presses the cover shell.

[0007] Furthermore, a sleeve is fixed at a middle position of a side of the cover shell facing the reducer, and the sleeve is sleeved on the hollow tube.

[0008] Furthermore, the outer surface of the housing is connected to an air inlet valve for connecting to an inert gas tank via a connecting pipe, and the outer surface of the housing is connected to an outwardly conducting exhaust valve via a connecting pipe.

[0009] Furthermore, a water storage cover is sleeved on the outer surface of the cylinder, and the water storage cover is arranged concentrically with the cylinder and fixedly connected to the cylinder, a vertically arranged branch pipe is installed at the upper position of the outer surface of the water storage cover, and a one-way valve connected to the cooling water supply pipeline is connected to the outer surface of the water storage cover through a connecting pipe, and the one-way valve is conductive in the direction of the water storage cover.

[0010] Furthermore, an internal threaded sleeve is fixed at a middle position of a side of the cylinder away from the pressure rod, the internal threaded sleeve is arranged concentrically with the cylinder, and the threaded rod is threadedly connected in the internal threaded sleeve.

[0011] Furthermore, a support is fixedly connected to the outer surface of one end of the cylinder close to the shell, and the support is fixedly connected to the shell, and the support is a component made of a heat-insulating material.

[0012] Furthermore, a disc is fixedly connected to one end of the pressure rod away from the second piston, and the disc and the pressure rod are an integrally formed structure.

[0013] Beneficial effects of the present invention:

[0014] 1. A segmented adjustable EGR cooler system of the present invention has a tubular cooler arranged on the front side of a plate cooler, which can perform preliminary cooling on the engine exhaust gas and reduce the thermal shock on the plate cooler. The plate cooler is provided with a bypass pipe, which can fully cool the exhaust gas. Under the regulation of the EGR valve, the exhaust gas is guided to enter the air outlet directly from the bypass pipe without passing through the plate cooler. The exhaust gas temperature regulation function can meet the exhaust gas recirculation intake requirements under different working conditions, and the segmented design can effectively reduce the thermal shock on the plate cooler and reduce thermal stress.

[0015] 2. A segmented adjustable EGR cooler system of the present invention uses bolts to install the connecting seat at the desired position, and then the threaded rod is turned. The threaded rod drives the first piston to move in the direction of the second piston in the cylinder, and then the second piston moves along the cylinder in the direction away from the first piston and drives the pressure rod to squeeze the cover shell, so that the cover shell covers the connecting seat and the cover shell fits with the mounting carrier of the connecting seat, thereby hiding the bolts fixing the connecting seat and preventing the bolts fixing the connecting seat from being affected by heat radiation, causing the temperature to rise and the rust speed to accelerate.

[0016] 3. A segmented adjustable EGR cooler system of the present invention has a water storage cover installed on the cylinder. When water is supplied to the cooling water supply pipeline, the one-way valve opens under the action of the pressure difference, and then the cooling water in the cooling water supply pipeline enters the water storage space formed by the water storage cover and the cylinder. Then, under the barrier of water, the water absorbs heat from the surrounding environment and generates water vapor which is discharged through the branch pipe, thereby achieving the effect of water evaporation and heat dissipation, which is beneficial to reducing the temperature of the surface of the cylinder and reducing the influence of temperature on the first piston and the second piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 It is a structural schematic diagram of a segmented adjustable EGR cooler system of the present invention;

[0019] Figure 2 This is an enlarged view of point A in a segmented adjustable EGR cooler system of the present invention;

[0020] Figure 3 It is a schematic diagram of the assembly of a tubular cooler, a bypass pipe and a housing in a segmented adjustable EGR cooler system of the present invention;

[0021] Figure 4 It is a schematic diagram of the assembly of a bypass pipe, a plate cooler and an EGR valve in a segmented adjustable EGR cooler system of the present invention;

[0022] Figure 5 It is a schematic diagram of the assembly of a first piston, a second piston and a cylinder in a segmented adjustable EGR cooler system of the present invention;

[0023] Figure 6 It is a schematic diagram of the assembly of an EGR valve and a housing in a segmented adjustable EGR cooler system of the present invention;

[0024] Figure 7 It is a structural schematic diagram of a semicircular plate in a segmented adjustable EGR cooler system of the present invention;

[0025] In the figure: 1-housing, 2-EGR valve, 3-air outlet, 4-temperature sensor, 5-reducing pipe, 6-cover, 7-connecting seat, 8-hollow pipe, 9-mounting hole, 10-disc, 11-pressure rod, 12-intake valve, 13-check valve, 14-water storage cover, 15-cylinder, 16-internal thread sleeve, 17-threaded rod, 18-support, 19-branch pipe, 20-exhaust valve, 21-tube sleeve, 22-tubular cooler, 23-bypass pipe, 24-plate cooler, 25-first piston, 26-second piston, 27-partition, 28-semicircular plate. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] See also Figures 1 to 7 The present invention provides a technical solution: a segmented adjustable EGR cooler system, comprising a shell 1, one end of the shell 1 is fixedly connected to a reducer 5, the end of the reducer 5 away from the shell 1 is installed with a hollow tube 8, the end of the hollow tube 8 away from the reducer 5 is fixedly connected to a connecting seat 7, and the connecting seat 7 is evenly provided with three mounting holes 9 on a side facing the reducer 5. The connecting seat 7 is installed at a desired position using the mounting holes 9 to complete the connection between one end of the hollow tube 8 and the carrier.

[0028] A tubular cooler 22 is installed on the side of the shell 1 close to the reducer 5, a plate cooler 24 is installed on the side of the shell 1 away from the reducer 5, a bypass pipe 23 is provided on one side of the plate cooler 24, the bypass pipe 23 is arranged in the shell 1, an EGR valve 2 for switching the bypass pipe 23 and the plate cooler 24 is installed on the end of the shell 1 away from the reducer 5, an air outlet 3 is installed on the end of the EGR valve 2 away from the shell 1, a tubular cooler 22 is arranged on the front side of the plate cooler 24, which can perform preliminary cooling of the engine exhaust gas and reduce the thermal shock on the plate cooler 24, the plate cooler 24 with the bypass pipe 23, the plate cooler 24 can fully cool the exhaust gas, and under the regulation of the EGR valve 2, the exhaust gas is guided to enter the air outlet 3 directly from the bypass pipe 23 without passing through the plate cooler 24, thereby effectively reducing the thermal shock and reducing the thermal stress.

[0029] A partition 27 for separating the plate cooler 24 and the bypass pipe 23 is installed in the EGR valve 2, and a rotatable semicircular plate 28 is installed in the EGR valve 2. When the semicircular plate 28 is in the middle position, the EGR valve 2 is in a closed state, and the tube cooler 22 and the plate cooler 24 do not work. When the semicircular plate 28 rotates to one side of the bypass pipe 23, the EGR valve 2 is communicated with the bypass pipe 23, the tube cooler 22 works, and the plate cooler 24 does not work. When the semicircular plate 28 rotates to one side of the plate cooler 24, the EGR valve 2 is communicated with the plate cooler 24, and the tube cooler 22 and the plate cooler 24 both work. A temperature sensor 4 is provided in the air outlet 3, and the output end of the temperature sensor 4 is connected to the input end of the PID controller. The output end of the PID controller is electrically connected to the input end of the EGR valve 2. The temperature sensor 4 transmits the gas temperature at the air outlet 3 to the PID controller, so that the PID controller can control the action of the EGR valve 2 according to the gas temperature.

[0030] As an embodiment of the present invention: a cover shell 6 for hiding the connecting seat 7 is sleeved on the hollow tube 8, and the cover shell 6 is slidably connected to the hollow tube 8. Two cylindrical bodies 15 are symmetrically installed at one end of the shell 1 close to the reducer 5, and the cylindrical bodies 15 are arranged along the length direction of the shell 1. A first piston 25 and a second piston 26 are slidably installed in the cylindrical body 15. A certain distance is maintained between the first piston 25 and the second piston 26. A threaded rod 17 is rotatably connected to the middle position of a side of the first piston 25 away from the second piston 26. The end of the threaded rod 17 away from the first piston 25 extends to the outside of the cylindrical body 15 and is threadedly connected to the cylindrical body 15. A pressure rod 11 is fixed to the middle position of a side of the second piston 26 away from the first piston 25. The end of the pressure rod 11 away from the second piston 26 extends to the outside of the cylindrical body 15 and presses the cover shell 6. The connecting seat 7 is installed by bolts. After being installed at the desired position, the threaded rod 17 is screwed, and the threaded rod 17 drives the first piston 25 to move in the cylinder 15 toward the second piston 26, and then the second piston 26 moves along the cylinder 15 in the direction away from the first piston 25 and drives the pressure rod 11 to squeeze the cover 6, so that the cover 6 covers the connecting seat 7 and the cover 6 fits the mounting carrier of the connecting seat 7, so as to hide the bolts fixing the connecting seat 7, and prevent the bolts fixing the connecting seat 7 from being affected by heat radiation and the temperature rises and the rust speed is accelerated. A certain distance is maintained between the first piston 25 and the second piston 26, and there is gas between the first piston 25 and the second piston 26. During the pressing process, the gas between the first piston 25 and the second piston 26 is in a compressed state, which plays a buffering role on the one hand, and prevents the threaded rod 17 from self-rotation under the action of the reaction force of the compressed gas on the other hand.

[0031] As an embodiment of the present invention, a sleeve 21 is fixed in the middle of one side of the cover shell 6 facing the reducer 5 , and the sleeve 21 is sleeved on the hollow tube 8 . The design of the sleeve 21 increases the contact range between the cover shell 6 and the hollow tube 8 .

[0032] As an embodiment of the present invention: the outer surface of the cover shell 6 is connected to an intake valve 12 for connecting to an inert gas tank through a connecting pipe, and the outer surface of the cover shell 6 is connected to an exhaust valve 20 that is conductive to the outside through a connecting pipe. After the cover shell 6 and the connecting seat 7 are mounted on a carrier, the intake valve 12 and the exhaust valve 20 are opened, and the inert gas in the inert gas tank flows into the cover shell 6, so that the oxygen in the cover shell 6 is discharged through the exhaust valve 20, thereby achieving the purpose of replacing the oxygen in the cover shell 6 and further reducing the probability of rust on the bolts fixing the connecting seat 7.

[0033] As an embodiment of the present invention: a water storage cover 14 is sleeved on the outer surface of the cylindrical body 15, and the water storage cover 14 is concentrically arranged with the cylindrical body 15 and fixedly connected with the cylindrical body 15. A vertically arranged branch pipe 19 is installed at the upper position of the outer surface of the water storage cover 14. The outer surface of the water storage cover 14 is connected to a one-way valve 13 connected to a cooling water supply pipeline through a connecting pipe. The one-way valve 13 is conductive in the direction of the water storage cover 14. The water storage cover 14 is installed on the cylindrical body 15. When water is supplied to the cooling water supply pipeline, the one-way valve 13 opens under the action of the pressure difference, and then the cooling water in the cooling water supply pipeline enters the water storage space formed by the water storage cover 14 and the cylindrical body 15. Then, under the barrier of water, the water absorbs heat from the surrounding environment and generates water vapor that is discharged through the branch pipe 19, thereby realizing the effect of water evaporation and heat dissipation, which is beneficial to reducing the temperature of the surface of the cylindrical body 15 and reducing the influence of temperature on the first piston 25 and the second piston 26.

[0034] As an embodiment of the present invention: an internal threaded sleeve 16 is fixed at the middle position of one side of the cylindrical body 15 facing away from the pressure rod 11, the internal threaded sleeve 16 is arranged concentrically with the cylindrical body 15, and a threaded rod 17 is threadedly connected in the internal threaded sleeve 16. The threaded rod 17 is screwed into the internal threaded sleeve 16 to realize the threaded connection between the threaded rod 17 and the cylindrical body 15.

[0035] As an embodiment of the present invention: a support 18 is fixedly connected to the outer surface of one end of the cylinder 15 close to the shell 1, and the support 18 is fixedly connected to the shell 1. The support 18 is a component made of a heat-insulating material, and the support 18 serves to connect the cylinder 15 and the shell 1.

[0036] As an embodiment of the present invention, one end of the pressure rod 11 away from the second piston 26 is fixedly connected with a disc 10 , and the disc 10 and the pressure rod 11 are an integrally formed structure. The design of the disc 10 increases the contact range between the pressure rod 11 and the cover shell 6 .

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A segmented adjustable EGR cooler system, comprising a housing (1), characterized in that: A reducer (5) is fixedly connected to one end of the shell (1), a hollow tube (8) is installed at one end of the reducer (5) away from the shell (1), a connection seat (7) is fixedly connected to one end of the hollow tube (8) away from the reducer (5), three installation holes (9) are evenly arranged on a side of the connection seat (7) facing the reducer (5), a tubular cooler (22) is installed on the side of the shell (1) close to the reducer (5), and a plate cooler (24) is installed on the side away from the reducer (5), a bypass pipe (23) is provided on one side of the plate cooler (24), and the bypass pipe (23) is arranged in the shell (1), and the shell (1) is away from the reducer. An EGR valve (2) for switching between a bypass pipe (23) and a plate cooler (24) is installed at one end of the tube (5), and an outlet (3) is installed at the end of the EGR valve (2) away from the shell (1); a cover (6) for hiding the connecting seat (7) is sleeved on the hollow tube (8), and the cover (6) is slidably connected to the hollow tube (8); two cylindrical bodies (15) are symmetrically installed at one end of the shell (1) close to the reducer (5), and the cylindrical bodies (15) are arranged along the length direction of the shell (1), and a first piston (25) and a second piston (26) are slidably installed in the cylindrical bodies (15), and the first piston (25) and the second piston (26) are slidably installed in the cylindrical bodies (15), and the first piston (25) and the second piston (26) are slidably connected to each other. A certain distance is maintained between the cover shell (6); a threaded rod (17) is rotatably connected to the middle position of a side of the first piston (25) facing away from the second piston (26); one end of the threaded rod (17) away from the first piston (25) extends to the outside of the cylinder (15) and is threadedly connected to the cylinder (15); a pressure rod (11) is fixed to the middle position of a side of the second piston (26) facing away from the first piston (25); one end of the pressure rod (11) away from the second piston (26) extends to the outside of the cylinder (15) and presses the cover shell (6); a sleeve (21) is fixed to the middle position of a side of the cover shell (6) facing the reducer (5); the sleeve (21) is sleeved on the hollow tube (8); the outer surface of the cover shell (6) is connected to an air inlet valve (12) for connecting to an inert gas tank through a connecting pipe, and the outer surface of the cover shell (6) is connected to an outwardly conductive exhaust valve (20) through a connecting pipe; the outer surface of the cylindrical body (15) is sleeved with a water storage cover (14), the water storage cover (14) is arranged concentrically with the cylindrical body (15) and is fixedly connected to the cylindrical body (15), a vertically arranged branch pipe (19) is installed at the upper position of the outer surface of the water storage cover (14), and the outer surface of the water storage cover (14) is connected to a one-way valve (13) connected to a cooling water supply pipeline through a connecting pipe, and the one-way valve (13) is conductive in the direction of the water storage cover (14).

2. A segmented adjustable EGR cooler system according to claim 1, characterized in that: An internal thread sleeve (16) is fixed at a middle position of a side of the cylindrical body (15) facing away from the pressure rod (11); the internal thread sleeve (16) is arranged concentrically with the cylindrical body (15); and the threaded rod (17) is threadedly connected in the internal thread sleeve (16).

3. A segmented adjustable EGR cooler system according to claim 1, characterized in that: A support (18) is fixedly connected to the outer surface of one end of the cylindrical body (15) close to the shell (1); the support (18) is fixedly connected to the shell (1); the support (18) is a component made of a heat-insulating material.

4. A segmented adjustable EGR cooler system according to claim 1, characterized in that: One end of the pressure rod (11) away from the second piston (26) is fixedly connected to a disc (10), and the disc (10) and the pressure rod (11) are an integrally formed structure.

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