Thermostat device for a cooling system and a cooling system comprising said thermostat device

Patent metadata

Field	Value
Publication number	US-11578641-B2
Application number	US-201816977850-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 14, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A thermostat device (8) for a cooling system in a vehicle. The device (8) includes a thermostat housing (15) enclosing a movably arranged valve body (16, 20, 34, 44). The valve body is configured to distribute coolant from a thermostat chamber (15a) to a radiator bypass line (9) and/or a radiator (11) in dependence on the position of the valve body. The device (8) has a first thermal expansion element (31) providing a first stroke of a valve body (16, 20, 34, 44) in response to the temperature of the coolant in a the pilot chamber (14a), and a second thermal expansion element (32) providing a second stroke of the valve body (16, 20, 34, 44) in response to the temperature of the coolant in the thermostat chamber (15a) such that the valve body (16, 20, 34, 44) is moved to a position defined by the strokes from the thermal expansion elements (31, 32). The pilot chamber (14a) has an outlet passage (14b) for directing coolant from the pilot chamber (14a) to the thermostat chamber (15a).

First claim

The invention claimed is:

1. A thermostat device for a cooling system comprising:
at least one component configured to be cooled by a circulating coolant and the cooling system comprises a radiator in which the coolant is cooled;
the thermostat device comprises a pilot chamber configured to receive coolant from a first position of the cooling system and comprises a thermostat chamber configured to receive coolant from a second position of the cooling system;
a first outlet from the thermostat chamber and the first outlet is configured to direct coolant, via a bypass line, and past the radiator;
a second outlet from the thermostat chamber and the second outlet is configured to direct coolant to the radiator;
a movably arranged valve body located in the thermostat chamber and configured to distribute the coolant in the thermostat chamber to the first and second outlets in dependence on the position, of the valve body, wherein the valve body includes a stroke member;
the pilot chamber comprises an outlet passage located and configured to direct coolant from the pilot chamber to the thermostat chamber;
the thermostat device comprises a first sensor member arranged stationary in the thermostat device comprising a first thermal expansion element, the first thermal expansion element having a first phase changing temperature, located and configured to be in thermal contact with the coolant in the pilot chamber and the first thermal expansion element being connected to the valve body, configured and operable to provide a first stroke of the valve body to move the stroke member of the valve body in response to phase change of the first thermal expansion element due to a first temperature of the coolant in the pilot chamber; and
a second sensor member connected to the stroke member comprising a second thermal expansion element that is movably arranged, the second thermal expansion element having a second phase changing temperature, located and configured to be in thermal contact with the coolant in the thermostat chamber and the second thermal expansion element being connected to the valve body, located, configured and operable to provide a second stroke of the valve body to move the valve body in response to phase change of the second thermal expansion element due to a second temperature of the coolant in the thermostat chamber such that the valve body is configured and movable to a position defined by both the first stroke from the first thermal expansion element and the second stroke from the second thermal expansion element, wherein the first phase changing temperature and the second phase changing temperature are different.

2. A thermostat device according to claim 1 , wherein the stroke member is connected to both the first and second thermal expansion elements.

3. A thermostat device according to claim 1 , further comprising the stroke member of the stationary arranged first thermal expansion element is connected to the second sensor member of the movably arranged second thermal expansion element and the stroke member of the movably arranged first thermal expansion element is connected to the valve body.

4. A thermostat device according to claim 3 , further comprising a connection member connects the stroke member of the stationary arranged first thermal expansion element to the sensor member of the movably arranged second thermal expansion element.

5. A thermostat device according to claim 1 , further comprising each thermal expansion element comprises a sensor member in the form of a capsule enclosing a material body and a material of the material body is configured to change a phase thereof at a specific temperature; and
the stroke member in the form of a piston located and configured to provide the stroke of the valve body when the material of the body changes the phase thereof.

6. A thermostat device according to claim 1 , further comprising the valve body is movably arranged between a first end position in which the valve body directs the entire coolant flow to the radiator bypass line, a second end position in which the valve body directs the entire coolant flow to the radiator, and at least one intermediate position in which the valve body directs a first part of the coolant flow to the radiator bypass line and a remaining part of the coolant flow to the radiator.

7. A thermostat device according to claim 6 , further comprising the thermostat device comprises a valve spring located and configured to move the valve body towards the first end position.

8. A thermostat device according to claim 1 , further comprising the movable valve body comprises a first valve plate configured to regulate the coolant flow to the radiator and a second valve plate configured to regulate the coolant flow to the radiator bypass line.

9. A thermostat device according to claim 1 , further comprising the movable valve body comprises a tubular sleeve having a periphery wall located, configured and operable to expose or to cover the first and second outlets based on a position of the tubular sleeve at a respective time.

10. A cooling system, comprising a thermostat device according to claim 1 .

11. A cooling system according to claim 10 , further comprising a combustion engine and a temporarily activated one of the components.

12. A cooling system according to claim 11 , further comprising the temporarily activated one of the components comprises a hydraulic retarder or a retarder cooler for a hydraulic retarder.

13. A thermostat device according to claim 1 , wherein the first phase changing temperature is lower than the second phase changing temperature.

14. A thermostat device for a cooling system comprising:
at least one component configured to be cooled by a circulating coolant and the cooling system comprises a radiator in which the coolant is cooled;
the thermostat device comprises a pilot chamber configured to receive coolant from a first position of the cooling system and comprises a thermostat chamber configured to receive coolant from a second position of the cooling system;
a first outlet from the thermostat chamber and the first outlet is configured to direct coolant, via a bypass line, and past the radiator;
a second outlet from the thermostat chamber and the second outlet is configured to direct coolant to the radiator;
a movably arranged valve body located in the thermostat chamber and configured to distribute the coolant in the thermostat chamber to the first and second outlets in dependence on the position, of the valve body;
the pilot chamber comprises an outlet passage located and configured to direct coolant from the pilot chamber to the thermostat chamber;
the thermostat device comprising:
a first sensor member arranged stationary in the thermostat device comprising a first thermal expansion element having a first capsule that includes a closed compartment than is occupied by a first material body, the first thermal expansion element in thermal contact with the coolant in the pilot chamber, and the first thermal expansion element being operatively connected to the a first stroke member of the valve body to provide a first stroke of the valve body to move the first stroke member of the valve body in response to a first temperature of the coolant in the pilot chamber; and
a second sensor member connected to the first stroke member comprising a second thermal expansion element having a second capsule that includes a closed compartment than is occupied by a second material body, the second thermal expansion element in thermal contact with the coolant in the thermostat chamber and the second thermal expansion element being connected to a

Assignees

• Scania Cv Ab

Inventors

• Kardos Zoltan
• Hall Ola

Classifications

• F01P7/16 Primary

  by thermostatic control · CPC title

• F01P3/20

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title

• F01P2060/06

  Retarder · CPC title

• F01P2025/08

  Temperature · CPC title

• G05D23/1852

  with sensing element expanding and contracting in response to change of temperature · CPC title