Fluid-regulating thermostat and method of manufacturing such a thermostat
A thermostat and fluid technology, applied in temperature control, control/regulation system, coolant flow control, etc., can solve the problem of thermostat failure, undisclosed one-piece body and thermostat assembly, single Unequal problem of piece scheme
Active Publication Date: 2009-02-18
VERNET SA
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However, while US-A-3792 813 explains when the body consists of two parts, in particular by utilizing the two-part structure of the body, the temperature control element and the Its spring is assembled into a part of the body to assemble the thermostat, but the document does not disclose how to assemble the one-piece body with the rest of the thermostat
Therefore, the one-piece solution proposed in US-A-3 792 813 cannot be used in practice, and it is also observed that the arms of the thermostat body are inclined at 45° relative to the working axis of the thermostat element and its spring, so that in operation , under the force generated by the thermostat element and its return spring, those arms run the risk of opening each other, causing the thermostat to malfunction
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[0022] Figures 1 and 2 show a thermostat 1 for regulating the flow of coolant flowing in the cooling circuit of an internal combustion engine, for example. In operation, the thermostat is designed to be placed in the connection area between the outlet pipe 2 and the hose 3, the outlet pipe coming from a heat exchanger forming part of the cooling circuit, the hose being used to transport liquid to the circuit The downstream position. As an example, the outlet pipe 2 is made of metal and constitutes the outlet of the heat exchanger associated with the exhaust gas recirculation (EGR) system. The EGR system is a pollution prevention device that injects part of the exhaust gas into the intake pipe of the engine to reduce the peak of the combustion temperature, thereby reducing the formation of pollutants such as nitrogen oxides. As indicated by the arrow 4, the coolant leaving the heat exchanger of the EGR system enters the inlet of the thermostat 1. The thermostat 1 controls whether t...
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The invention relates to a fluid-regulating thermostat and a method of manufacturing such a thermostat. The thermostat (1) comprises a body (10) which comprises a one-piece metal part (11) including simultaneously, in succession along the axis of a thermostatic element (20) of the thermostat, a transverse tab (12) against which the piston (22) of this element can bear, a tubular part (13) centredon this axis and defining a shut-off seat (13A), and two support arms (14) supporting a return spring (40) for returning this element, which arms extend lengthwise more or less in the axial directionof the element and each delimits, at their opposite end (14A) to the tubular part, a surface (14A1) for contact with the spring against which surface the compressed spring is pressed. To make it easier to manufacture this body and to assemble it with the other components of the thermostat, each arm is, at its end (14B) facing towards the tubular part, connected to the rest of the one-piece metal part in a way that can be deformed between a service position in which the contact surface is plumb with one end of the spring, and an assembly position in which this surface is away from the axis.
Description
Technical field [0001] The invention relates to a fluid-regulating thermostat / thermostat, especially for the cooling fluid of an internal combustion engine, and also relates to a method of manufacturing such a thermostat. [0002] The present invention more specifically relates to a thermostat including a temperature control element / thermostat element and a body, the temperature control element responds to the temperature of the fluid to be adjusted, controls the closing of the flow of the fluid flowing through the thermostat, and interacts with The return spring is connected, and the temperature control element and the spring are arranged in the body. The body of the thermostat must meet conflicting constraints: first, the structure of the body must be sufficiently rigid to absorb the pressure of the fluid to be regulated and the mechanical forces related to the operation of the temperature control element and its return spring; , The structure of the body must be sufficiently op...
Claims
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IPC IPC(8): G05D23/02F01P7/16
CPCG05D23/022Y10T29/49863
Inventor N·鲍狄埃
Owner VERNET SA