CN215408921U - EGR cooler cooling temperature control device - Google Patents

Abstract

The utility model discloses a cooling temperature control device of an EGR cooler, which comprises a cooler shell and a cooler core body, wherein an air inlet and an air outlet are respectively arranged at two ends of the cooler shell, the cooler core body is arranged in the cooler shell, a round hole is formed in the bottom of the cooler shell, a water inlet pipe is arranged in the round hole and is connected with the cooler core body, a temperature control device is arranged on the cooler core body and comprises a sealing cover, a spring, a conical plug and an expansion cavity, the spring is arranged in the sealing cover, the conical plug is arranged at the bottom of the spring, and the expansion cavity is arranged at the bottom of the cooler core body. The utility model realizes the automatic change of the cooling intensity, thereby realizing the automatic temperature control, controlling the temperature more accurately after cooling and improving the reliability.

Description

EGR cooler cooling temperature control device

[ technical field ] A method for producing a semiconductor device

The utility model belongs to the technical field of heat exchangers, and particularly relates to a cooling temperature control device of an EGR cooler.

[ background of the utility model ]

Egr (exhaust Gas recirculation), is a technology for cooling exhaust Gas discharged after combustion of an engine, introducing the cooled exhaust Gas into an intake pipe, mixing the cooled exhaust Gas with fresh intake air, and then introducing the mixture into a cylinder of an internal combustion engine for combustion. An EGR system may reduce emissions of pollutant gases. The temperature of tail gas of an internal combustion engine is generally 500-700 ℃, the tail gas can be guided into an air inlet pipe only after being cooled to a certain temperature range, carbon deposition and gel formation substances can be generated in an EGR cooler and an EGR valve after the tail gas is cooled to a low temperature, and the EGR cooler is blocked, the cooling efficiency is reduced, the EGR valve is blocked and the like due to excessive carbon deposition and gel formation substances; after cooling, the EGR valve is damaged due to overhigh temperature, the air inlet temperature of the internal combustion engine is overhigh, the air charging efficiency is reduced, and the emission exceeds the standard. The temperature range after cooling is 120-180 ℃ generally recommended.

At present, a common EGR cooling system generally has no direct cooled air temperature control device, the cooled air temperature changes along with the change of the operating condition of an internal combustion engine, the temperature is lower at the low load of the internal combustion engine and may be less than 80 ℃, and the temperature may exceed 220 ℃ at the high load. Some EGR cooling systems include a post-cooling climate control device, for example, patent No. CN201611227352.6 discloses a water-side controllable EGR cooling system, in which a valve is disposed on the cooling water side, the valve and the EGR gas-side valve are linked by a mechanical or electrical control method, and the water-side valve and the gas-side valve are opened and closed simultaneously. Although the flow rate of the cooling water is controllable, the post-EGR temperature cannot be controlled, because a large EGR rate is required at low engine load, that is, the opening degree of the EGR gas end valve is large, and if the water end valves are linked together, the opening degree of the water end valve is also large, and the exhaust gas temperature is low at low engine load, and rather, so much cooling water is not required.

Patent application No. CN201810122901.6 discloses an EGR cooling system and a control method, wherein a flow control valve is added on an EGR cooling water path, and the opening degree of the flow control valve is controlled by an EGR rate calibrated in an engine controller, so that the aim of controlling the temperature after EGR cooling is fulfilled. A temperature sensor is arranged at the outlet of the air end of the EGR cooler, and the opening degree of the electromagnetic valve is controlled through data which is well defined in the engine controller, so that the flow of cooling water is controlled to achieve the purpose of controlling the air temperature after the EGR is cooled. The method needs a large amount of calibration work in the early stage, adopts an electromagnetic flow control valve, has high cost, has relatively poor reliability due to long-term contact of parts and liquid, and is easy to generate mechanical faults such as clamping stagnation, water leakage and the like, and circuit faults such as short circuit, open circuit and the like.

Patent application No. CN201420404339.3 discloses an EGR cooler, and its principle is that be connected with the thermostat before EGR cooler water inlet, the engine cold machine starts initial stage temperature low thermostat and does not open, and water does not flow through the cooler, though this scheme can avoid starting initial stage exhaust gas cooling temperature and hang down, can not control the temperature behind the exhaust gas cooling after the temperature rising thermostat opens.

In summary, in the conventional EGR cooled air temperature control, a solenoid valve is mainly adopted in a water path to control water flow of the water path, or a thermostat is additionally arranged on the water path to achieve the purpose of controlling cooled air temperature, the former has high control precision but higher cost, and the reliability of the solenoid valve arranged on the water path cannot be ensured; the latter cannot control the cooling temperature after the thermostat with high water temperature is fully opened, and the effect is poor. In order to solve the technical problem, the scheme provides a device which is simple in structure, low in cost and capable of accurately controlling the temperature after cooling.

The above background disclosure is only for the purpose of aiding understanding of the inventive concepts and solutions of the present invention, and it is not necessary for them to belong to the prior art of this patent application, and it should not be used for evaluating the novelty and inventive step of this application in the case that there is no clear evidence that the above contents are disclosed at the filing date of this patent application.

[ Utility model ] content

The utility model aims to provide a cooling temperature control device of an EGR cooler, which aims to solve the problems that the temperature of exhaust gas cannot be accurately and automatically controlled, the cooling temperature is not well controlled due to the fact that the water flow is controlled by water temperature, the effect is poor, the reliability of a temperature control device controlled by a circuit is poor, the cost is high and the like in the existing EGR cooling structure.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a EGR cooler cooling temperature control device, includes cooler casing and cooler core, the both ends of cooler casing are equipped with air inlet and gas outlet respectively, be equipped with the cooler core in the cooler casing, the round hole has been seted up to the bottom of cooler casing, be equipped with the inlet tube in the round hole, inlet tube and cooler core body coupling, be equipped with temperature regulating device on the cooler core, temperature regulating device is including sealed lid, spring, toper stopper, inflation chamber, sealed covering and being equipped with the spring, the bottom of spring is equipped with the toper stopper, the bottom of cooler core is equipped with the inflation chamber.

Furthermore, a water outlet is formed in the top surface of one side of the cooler core body, and the sealing cover is arranged at the water outlet of the cooler core body.

Furthermore, a water outlet pipe is arranged on the side wall of the sealing cover.

Furthermore, the bottom of the sealing cover is provided with a convex ring, the section of the convex ring is in an inverted trapezoid shape, and a conical plug in a corresponding shape is arranged in the convex ring.

Furthermore, a push rod is arranged at the bottom of the conical plug, and a round hole for the push rod to penetrate through is formed in the bottom of the cooler core body.

Further, the expansion cavity is positioned below a circular hole at the bottom of the cooler core body for the push rod to pass through.

Further, the expansion device also comprises an expansion medium, and the expansion cavity is internally provided with the expansion medium.

Furthermore, a layer of deformation film is arranged above the expansion medium in the expansion cavity.

The utility model has the following beneficial effects:

(1) this temperature control device adopts and to set up the inflation chamber bottom the cooler core, makes the inflation chamber and has thermal waste gas contact, sets up the toper stopper in the cooler core, connects inflation chamber and cone valve through the push rod, utilizes expend with heat and contract with cold principle, and the inflation chamber is according to the rivers size that the automatic control cooler water side was realized to the high and low inflation of temperature or shrink promotion cone valve switch after the cooling, realizes cooling strength automatic change to realize automatic temperature control.

(2) The cooling water flow is automatically adjusted through the change of the cooling air temperature, so that the cooled air temperature reaches dynamic balance, the water flow is not regulated by the water temperature, and the controlled cooled air temperature is more accurate.

(3) The device does not need electronic components such as an electromagnetic valve and a temperature sensor to realize automatic temperature control, avoids various problems caused by the use of the electronic components in a water path and a high-temperature environment, improves the reliability, and does not need a large amount of calibration work in the early stage.

(4) The cone valve, the push rod and the expansion cavity can be made into one part, and the whole part can be taken out only by disassembling the sealing cover, so that the installation, the use and the replacement are convenient. The device has simple structure and low cost, and can be used after being installed.

[ description of the drawings ]

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a cross-sectional view of a front view of the present invention;

1. an air inlet; 2. a cooler housing; 3. a cooler core; 4. a sealing cover; 4-1, water outlet pipe; 4-2, a convex ring; 5. a conical plug; 5-1, a push rod; 6. a spring; 7. an air outlet; 8. an expansion medium; 9. an expansion chamber; 10. and (4) a water inlet pipe.

[ detailed description ] embodiments

The following is a detailed description of specific embodiments.

The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the utility model or its application.

As shown in figure 1, a cooling temperature control device of an EGR cooler comprises a cooler shell 2 and a cooler core 3, wherein the left end of the cooler shell 3 is provided with an air inlet 1, the right end of the cooler shell 3 is provided with an air outlet 7, the cooler core 3 is arranged in the cooler shell 2, the bottom of the cooler shell 2 is provided with a round hole, a water inlet pipe 10 is arranged in the round hole, the water inlet pipe 10 is connected with the bottom of the cooler core 3, the cooler core 3 is provided with a temperature control device, the temperature control device comprises a sealing cover 4, a spring 6, a conical plug 5 and an expansion cavity 9, the top surface of the middle right side of the cooler core 3 is provided with a water outlet, the sealing cover 4 is arranged above the water outlet of the cooler core 3, the side wall of the sealing cover 4 is provided with a water outlet pipe 4-1, the sealing cover 4 is provided with the spring 6, the bottom of the sealing cover 4 is provided with a convex ring 4-2, and the section of the convex ring 4-2 is in an inverted trapezoid shape, a conical plug 5 which is in a shape corresponding to the section of the convex ring 4-2 is arranged in the convex ring 4-2, the bottom of the spring 6 is connected with the top of the conical plug 5, a push rod 5-1 is arranged at the bottom of the conical plug 5, and a round hole for the push rod 5-1 to pass through is formed in the bottom of the cooler core body 3.

The bottom of the cooler core body 3 is provided with an expansion cavity 9, and the specific position of the expansion cavity 9 is positioned below a circular hole at the bottom of the cooler core body 3 for the push rod 5-1 to pass through. The expansion cavity 9 is internally provided with an expansion medium 8, the expansion medium is paraffin or can be converted into a melting state and a substance with a large expansion coefficient by a solid state in the heating process, the expansion cavity 9 is internally provided with a layer of deformation film above the expansion medium 8, the deformation film is made of polytetrafluoroethylene or other plastic materials with good heat resistance, the deformation film is used for preventing the expansion medium 8 from overflowing in the heating process, and can support the push rod 5-1 at the bottom of the conical plug 5 of the control device, the flow of the water gap is adjusted according to actual heat, and the effect of temperature control is achieved.

The working principle is as follows: in the temperature control device, high-temperature waste gas enters from an air inlet 1 of a cooler shell 2 and is discharged from an air outlet 7 of the cooler shell 2, cooling liquid enters from a water inlet pipe 10, flows through a cooler core body 3 and then is discharged from a water outlet pipe 4-1 on the side wall of a sealing cover 4, when the waste gas with large heat passes through the cooler shell 2 and is contacted with an expansion cavity 9, an expansion medium 8 in the expansion cavity 9, such as paraffin wax, becomes a molten state and expands in the high-temperature heating process, a deformation film above the expansion medium 8 is jacked up, so that a push rod 5-1 at the bottom of a conical plug 5 is jacked up, the conical plug 5 is opened, the cooling liquid starts to flow to cool the waste gas, and when the temperature of the waste gas is higher, the expansion medium 8 expands more, and finally the opening of a water outlet at the conical plug 5 is opened more, and the flow rate of the cooling liquid is increased, carry out cooling treatment to waste gas, become low when the waste gas temperature, the internal energy of expansion medium 8 also reduces gradually, and expansion medium 8 has the trend of reducing gradually, and the opening of the delivery port of toper stopper 5 department slowly diminishes, realizes cooling strength automatic change to realize automatic temperature control, the cooling back temperature of control is more accurate.

The above description should not be taken as limiting the utility model to the specific embodiments, but rather, as will be readily apparent to those skilled in the art to which the utility model pertains, numerous simplifications or substitutions may be made without departing from the spirit of the utility model, which should be construed to fall within the scope of the utility model as defined in the claims appended hereto.

Claims (8)

1. The utility model provides a EGR cooler cooling temperature control device, includes cooler casing and cooler core, the both ends of cooler casing are equipped with air inlet and gas outlet respectively, be equipped with the cooler core in the cooler casing, the round hole has been seted up to the bottom of cooler casing, be equipped with the inlet tube in the round hole, inlet tube and cooler core body coupling, its characterized in that: the cooler core body is provided with a temperature control device, the temperature control device comprises a sealing cover, a spring, a conical plug and an expansion cavity, the spring is arranged in the sealing cover, the conical plug is arranged at the bottom of the spring, and the expansion cavity is arranged at the bottom of the cooler core body.

2. The EGR cooler cooling temperature control device according to claim 1, characterized in that: the top surface of one side of the cooler core body is provided with a water outlet, and the sealing cover is arranged at the water outlet of the cooler core body.

3. The EGR cooler cooling temperature control device according to claim 2, characterized in that: and a water outlet pipe is arranged on the side wall of the sealing cover.

4. The EGR cooler cooling temperature control device according to claim 2, characterized in that: the bottom of the sealing cover is provided with a convex ring, the section of the convex ring is in an inverted trapezoid shape, and a conical plug in a corresponding shape is arranged in the convex ring.

5. The EGR cooler cooling temperature control device according to claim 1, characterized in that: the bottom of the conical plug is provided with a push rod, and the bottom of the cooler core body is provided with a round hole for the push rod to penetrate through.

6. The EGR cooler cooling temperature control device according to claim 5, characterized in that: the expansion cavity is positioned below a circular hole at the bottom of the cooler core body for the push rod to pass through.

7. The EGR cooler cooling temperature control device according to claim 1, characterized in that: the expansion cavity is internally provided with an expansion medium.

8. The EGR cooler cooling temperature control device according to claim 1, characterized in that: and a layer of deformation film is arranged above the expansion medium in the expansion cavity.

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