JPH0456215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a damper thermostat that allows the damper position to be opened and closed freely and set at a constant position to control air volume.

[Background of the invention]

A conventional damper thermostat of this type will be explained with reference to FIG. 1. Reference numeral 1 denotes a damper thermostat main body, and 2 a capillary connected to a telescopic bellows 3 to seal a refrigerant 4. Reference numeral 5 denotes an operating plate which abuts against the bellows 3 and has a fulcrum portion 5a, and a spring 6.
is fixed to the operating plate and the adjustment plate 7.
The operating plate 5 rotates around the fulcrum portion 5a due to the expansion and contraction of the bellows and the balance of the spring force. Reference numeral 8 is a cam that is slidably fixed to the damper thermostat body, and by changing the adjusting plate 7, the open/close position of the damper 9 is changed depending on the temperature. The damper 9
is rotatably engaged with the tip of the actuating plate.
0 is a damper spring, which is a plate spring formed into a dogleg shape and whose end is fixed to the damper 9. The damper is positioned by abutting the damper against the tip end 5b of the operating plate by the force of the damper spring. Reference numeral 11 denotes a duct forming a passage, and a rib 11a is provided on the outer periphery of the opening. Next, to explain the opening/closing operation of the damper and the influence of the damper spring, the rotation of the operating plate 5 is transmitted to the damper 9, and the damper 9 comes into contact with the lower end of the duct opening rib, and when the operating plate 5 further rotates, the damper 9 The upper end gradually closes while sliding downward and overcoming the reaction force of the damper spring 10.

However, the damper thermostat having such a structure had the following drawbacks. That is, when the damper closes, the damper spring acts against the closing force of the operating plate, and since the damper closes while sliding on the lower end, the frictional force increases. Conversely, when opening, the opening force of the operating plate is added. Therefore, variations in the force of the damper spring cause variations in the opening and closing positions. It also had defects such as a large number of parts and high cost.

[Purpose of the invention]

The present invention was made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a damper thermostat that does not require a damper spring and has no variation in damper opening depending on temperature.

[Summary of the invention]

That is, the damper is brought into contact with the lever by using only the rotational moment due to the damper's gravity, which is provided with a distance between the damper center of gravity and the damper drive fulcrum.

[Embodiments of the invention]

An embodiment of the invention will be described with reference to FIG.

The same numbers as those in the conventional example indicate the same thing. Further, since the damper thermo main body is the same as the conventional example, the structure and opening/closing operation of the damper will be omitted, and the explanation will be omitted. The operating plate 5 extends perpendicularly to the rotation fulcrum 5a, and has a driving fulcrum 5c that rotatably engages the damper 9 on the upper part of the operating plate. The drive fulcrum portion 5c has a distance (dimension A) from the center of gravity G of the damper 9. In the opening/closing operation of the damper, when the damper is not in contact with the opening rib surface of the duct 11, it is forcibly brought into contact with the operating plate 5 and positioned by the rotational moment f due to the damper's gravity. When the damper is about to change from open to closed, the rotation of the operating plate is first transmitted to the damper and comes into contact with the upper end of the duct opening rib. When the operating plate 5 further rotates, the damper slides on the upper end of the duct opening rib and closes its lower end, resulting in a fully closed state. When the damper is next opened, the lower end tends to move away from the duct opening rib surface due to the rotational moment f caused by the gravity of the damper.
At this time, the frictional force between the duct opening rib surface and the damper,
The damper opens while determining the opening degree at a position where the opening force of the operating plate and the rotational moment force due to gravity of the damper are balanced. Therefore, since the rotational moment due to the damper's gravity is considered to be approximately constant, the frictional force with the duct surface and the force applied to the operating plate are also constant, so the temperature relationship is always constant. At this time, it is natural that the surface accuracy of the duct surface is ensured so that the frictional force on the duct surface is extremely small and uniform.

〔Effect of the invention〕

As explained above, the present invention utilizes only the rotational moment force due to gravity of the damper by ensuring the distance (dimension A) between the driving fulcrum where the operating plate and the damper are engaged and the center of gravity of the damper. This is an inexpensive damper thermostat that not only provides a uniform damper thermostat in which the most required relationship between temperature and opening degree is always constant, but also has a reduced number of parts since the damper spring can be removed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional damper thermostat installed, and FIG. 2 is a sectional view of the damper thermostat illustrating the present invention. 1... Damper thermostat body, 2... Capillary, 3... Bellows, 4... Refrigerant, 5...
Operating plate, 5a... Operating plate fulcrum, 5b... Operating plate tip, 6... Spring, 7... Adjustment plate, 8... Cam,
9...damper, 10...damper spring, 11...
...Duct, 11a...Duct opening outer peripheral rib, 5
c... Drive fulcrum, G... damper center of gravity, f...
Rotational moment due to damper gravity.

Claims (1)

[Claims] 1. It has an operating plate that converts temperature changes into pressure changes, transmits the pressure changes to an expandable bellows, and rotates due to the expansion and contraction of the bellows, and the operating plate extends vertically from a rotation fulcrum axis, and operates. In a damper thermostat that has a damper that opens and closes by transmitting the rotation of a plate, a distance (A dimension) is set between the center of gravity of the damper and the fulcrum for opening and closing the damper, and the damper uses only the rotational moment due to the damper's gravity to move the damper toward the duct opening. The damper opening is defined as the position where it touches the lever without contacting the outer circumferential rib surface,
A damper thermostat characterized in that the damper is rotated using the contact portion as a fulcrum when it comes into contact with the outer circumferential rib surface of the duct opening.