KR100589164B1 - Thermostat for Vehicle - Google Patents

Abstract

The present invention relates to a thermostat for a vehicle, wherein a wax-filled sensing unit, an upper piston supported on the main frame to open and close the main valve according to the sensing temperature of the sensing unit, a spring for elastically supporting the main valve, and a main frame supported on the main frame In the thermostat for a vehicle having a bypass valve which is installed via a bypass valve shaft, the first diaphragm 17 and the second diaphragm 17 are respectively disposed on the main frame 15 and the sub-frame of the bypass valve 13. 19) is installed, the first diaphragm 17 is located on the radiator (cooling water inlet) side (A) and the second diaphragm (19) is formed on the bypass (B) side, cold radiated from the radiator side (A) The coolant on the radiator side is increased by increasing the thermostat variable by the influence of the wax part of the thermostat by the influence of the hot coolant flowing from the bypass side (B) when the coolant does not cross each other. It is a structure that reduces the temperature of the engine by flowing to the side. Especially, the cooling water temperature of the engine is controlled to be high during idle, thereby preventing the radiator cooling fan from continuing to operate, which greatly helps the engine fuel efficiency and noise reduction.

Description

Thermostat for Vehicle             

1 is an installation state of the present invention thermostat,

Figure 2 is a perspective view showing that the diaphragm is installed in the main frame in the thermostat according to the present invention,

Figure 3 is a perspective view of the present invention the thermostat viewed from the left side,

Figure 4 is a perspective view showing that the diaphragm is installed in the bypass valve in the thermostat according to the present invention,

5 is a perspective view of the present invention the thermostat viewed from the right side,

6 is a perspective view of a thermostat according to a conventional use example of FIG.

7 is a perspective view of a thermostat according to a conventional use example of FIG. 4;

8 is a cross-sectional view of a thermostat according to a conventional use example,

<Description of Symbols for Main Parts of Drawings>

1-Main Valve 3-Bypass Valve

5-Wax Sensing Unit 7-Thermostat

9-Thermostat Case 11-Main Valve

15-Mainframe 17-First Diaphragm

19-Second Diaphragm

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostat for a vehicle engine. More particularly, the present invention relates to a vehicle thermostat for improving cooling water temperature sensitivity by artificially forming a flow path so that the bypass side streamline and the radiator side streamline do not cross each other.

The thermostat is installed at the outlet of the coolant passage of the cylinder head and automatically opens and closes the passage according to the temperature change inside the engine to properly regulate the coolant temperature.If the coolant temperature is lower than normal, close the valve to prevent the coolant from flowing to the radiator. And it circulates through the bypass passage, and when it is over a certain temperature, it starts to open slowly and flows toward the radiator.The thermostat used in the vehicle usually starts to open slowly when the cooling water temperature reaches 76 ℃ to 83 ℃, and 95 ℃ Open completely to adjust the coolant temperature to 75 ° C to 85 ° C.

 6 to 8 respectively show a thermostat according to a conventional use example, a sensing unit 50 filled with wax having a large volume change rate according to cooling water temperature, and a main valve according to temperature sensing of the sensing unit 50. The upper piston (not shown) supported by the main frame 54 to open and close the 52, the spring 56 to prevent the return of the main valve 52 and the cooling water pressure difference, and the main frame 54 Bypass valve 60 is provided on the bypass valve shaft 58 is supported by).

Since the thermostat 62 configured as described above is turned off when the engine does not reach the normal operating temperature, the coolant does not pass to the radiator and is circulated only inside the engine. After passing through the radiator and then into the water pump, the coolant sent to the engine by the water pump constitutes a circulation circuit flowing through the thermostat and the radiator to the water pump again.

In this case, when the cooling water temperature is higher than the predetermined value, the cooling fan operates at a constant speed, and when the cooling water temperature falls below the predetermined value, the cooling fan stops.

However, in the thermostat of the above structure, the bypassed coolant and the radiator coolant streamline cross each other, and the radiator fan does not fall in a timely manner because the temperature of the coolant of the radiator is largely affected by the large flow rate of the radiator. There is a disadvantage in that the fan rotation noise is generated unnecessarily to operate constantly, thereby lowering the fuel economy.

Accordingly, the present invention is to solve the above problems, by installing a diaphragm on the main frame and the bypass valve side, respectively, so that the flow direction of the coolant does not cross, thereby providing a thermostat for a vehicle to improve the temperature sensitivity of the wax sensing unit. Has its purpose.

The vehicle thermostat of the present invention for achieving the above object is a wax sensing unit, a main valve supported by the main frame and opened and closed according to the expansion of the wax sensing unit, a spring for elastically supporting the main valve, and the main frame. A thermostat for a vehicle having a bypass valve installed through a supported bypass valve shaft, wherein a first diaphragm and a second diaphragm are respectively installed on the main frame and the bypass valve, wherein the first diaphragm is the main frame. The second diaphragm is formed of a block plate shaped in a fan shape on the side near the outlet of the water pump side from the bypass valve, and formed on the bypass side from the radiator side inlet. Inflowing coolant flows in front of the wax sensing unit, and the coolant flows from the radiator side. It is characterized in that the exit directly to the water pump side exit without passing through the wax sensing unit.

delete

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, as shown in the drawing, the thermostat (7) having a main valve (1), bypass valve (3) and wax sensing unit (5) is built in the thermostat case (9), the thermo The right side of the stat case 9 is connected to the radiator side (A) inlet, the left side is connected to the cylinder head bypass side (B) inlet and the water pump side (C) outlet, respectively, and constitutes the thermostat (7). The main valve 1 side is located toward the radiator side A inlet, and the bypass valve 3 is directed to the bypass side B inlet.

In addition, a first diaphragm 17 is installed in the main frame 15 on which the main valve 1 is supported, as shown in FIGS. 2 and 3, respectively, and the bypass valve 3 is illustrated in FIGS. As shown in FIG. 5, the second diaphragm 19 is disposed at a position diagonal to the first diaphragm 17.
That is, the first diaphragm 17 is formed of a blocking plate molded in a fan shape on a side far from the radiator side A inlet of the main frame 15, and the second diaphragm 19 is the bypass valve. In (3) it is formed of a blocking plate molded in a fan shape on the side close to the water pump side outlet (C).
Therefore, the coolant flowing from the bypass side (B) inlet is introduced into the thermostat case (9) far from the water pump side (C) outlet (front part of the wax sensing unit (5)) and the wax sensing unit ( After passing through 5), the water pump side (C) exits, and the coolant flowing from the radiator side (A) inlet flows into the rear of the wax sensing unit 5 to pass through the wax sensing unit 5. It will exit directly to the water pump side (C) exit.

According to the present invention configured as described above, the coolant heat exchanged from the cylinder head bypass side (B) flows into the thermostat case (9) to reach the thermostat (7). When the water flows to the outlet of the pump side C and the cooling water temperature is equal to or higher than a predetermined value, the main valve 1 is opened as the wax encapsulated in the wax sensing part 5 constituting the thermostat 7 opens and the radiator side ( A) The inlet is open.

When the coolant flows in this way, the coolant is discharged to the water pump side C outlet by the first diaphragm 17 and the second diaphragm 19 in a streamlined manner as shown in FIG. (B) There is almost no crossover between the coolant flowing into the inlet and the coolant flowing into the radiator (A).

That is, as described above, the portion of the cooling water entering the bypass side (B) inlet is close to the outlet of the water pump side (C) by the second diaphragm 19, so that the front of the wax sensing unit 5 ( Since it flows into the lower part of the figure, it flows through the entire area of the wax sensing unit 5 to the outlet of the water pump side C, and the cooling water flowing into the radiator side A inlet is forward of the wax sensing unit 5. The communication part is blocked by the first diaphragm 17 and flows into the rear of the wax sensing unit 5 (the part close to the outlet of the water pump side) and immediately exits the outlet of the water pump side (C).
Therefore, the wax sensing unit 5 is minimized to react by the coolant flowing from the radiator side (A) inlet and is able to react as much as possible to the coolant flowing from the bypass side (B) inlet. Since the main valve 1 can be quickly opened to send the radiator side coolant to the engine through the water pump, the engine cooling action can be performed quickly, and the radiator fan can be prevented from operating at all times.

Meanwhile, in the embodiment of the present invention, the installation range of the first and second diaphragms, that is, the flow path blocking angle range of the diaphragm is set to 180 degrees (theta is 180 degrees in FIGS. 2 and 4, respectively), and then installed around the wax sensing unit. As a result of measuring the average temperature of the cooling water, it was found that 94.6 ℃ was shown as compared to the bypass temperature (B) inflow temperature of 95 ℃, so that the influence of the cooling water flowing into the radiator side (A) inlet had little effect. It is not limited to 180 degrees and can be selectively changed according to the vehicle model and other engine conditions.

As described above, according to the present invention, by installing a diaphragm in the main frame and the bypass valve to change the coolant flow is blocked, the coolant flowing into the bypass inlet flows into the front of the wax sensing unit and the coolant flowing into the radiator inlet is By directly exiting the water pump side exit, the thermal sensitivity of the wax sensing unit is prevented from being lowered by the cooling water flowing from the radiator, thereby preventing the radiator fan from operating at all times, thereby improving fuel efficiency.

Claims (2)

In a vehicle thermostat having a wax sensing unit, a main valve opened and closed by shrinkage expansion of the wax sensing unit, a main frame supporting the main valve, a bypass valve installed on the opposite side of the main valve in the main frame, The first diaphragm and the second diaphragm are respectively installed in the main frame and the bypass valve, The first diaphragm is formed as a blocking plate shaped in a fan shape on a side far from the radiator side inlet of the main frame, and the second diaphragm is formed in a fan shape on a side near the outlet of the water pump side in the bypass valve. Formed into, The cooling water flowing from the bypass side is introduced into the front of the wax sensing unit, the cooling water flowing from the radiator side is to pass directly to the water pump side exit without passing through the wax sensing unit. delete

Images