JPS6074216A - Damper thermostat - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a damper thermostat that controls the scenery by opening and closing the damper position and setting it at a constant position.

[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 contacts 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 tip of the damper 9 is rotatably engaged with the operating plate, and 10 is a damper spring, which is formed into a dogleg shape and its end is fixed to the damper 9, and the force of the damper spring moves the damper to the operating plate. The damper is positioned by abutting against the tip 5b. Reference numeral 11 denotes a duct forming a passage, and a rib lla 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, the damper 9 contacts the lower end of the duct opening rib, and when the operating plate 5 further rotates, the damper 9 moves to the lower part. damper spring 10 while sliding
The upper end gradually closes while overcoming the reaction force.

However, the damper thermostat having such a structure has the following drawbacks. In other words, Dan, (- When the damper closes, the spring acts against the closing force of the operating plate, and as the damper closes while sliding on the lower end, the frictional force increases. When the opposite is true, the opening force of the operating plate increases. will be added to.

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 costs.

[Purpose of the invention]

The present invention has been 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 the degree of opening of the damper with respect to 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 tamper 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. Furthermore, since the damper thermo main body is the same as that of the conventional example, the structure and opening/closing operation of a portion of the damper will be omitted, and the explanation will be omitted. The operating plate 5 extends perpendicularly to the rotation fulcrum portion 5a, and has a drive fulcrum portion 5C that rotatably engages the damper 9 on the upper portion 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 1, the damper is forcibly brought into contact with the operating plate 5 and positioned by the rotational moment f due to gravity of the damper. 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. In the following cases, the damper tends to move away from the lower end and from the duct opening rib surface due to the rotational moment f due to gravity of the damper. At this time, the damper opens while the degree of opening of the damper is determined at a position where the frictional force between the duct opening rib surface and the damper, the opening force of the operating plate, and the rotational moment force due to the damper's gravity are balanced. Therefore, since the rotational moment due to the force of the damper 4 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 relationship between temperature and opening degree 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) between the driving fulcrum where the operating plate and the damper are engaged and the center of gravity of the damper. This damper thermostat not only provides a damper thermostat with no variation in which the most required relationship between temperature and opening degree is always constant, but also allows the removal of the damper spring, resulting in a low-order damper thermostat with a small number of parts.

[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 a damper thermostat illustrating the present invention. DESCRIPTION OF SYMBOLS 1... Damper thermostat main body, 2... Capillary, 3... Bellows, 4... Refrigerant, 5... Operating plate, 5a... Operating plate fulcrum part, 5b... Operating plate tip,
6...Spring. 7... Adjustment plate, 8... Cam, 9... Damper, 1
0...damper spring, 11...duct, lla...
・Duct opening outer circumference, 5C... Drive fulcrum part, G・
...Damper center of gravity, f... Rotating moment due to damper weight force E. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] The operating plate converts temperature changes into pressure changes, transmits the pressure changes to an expandable bellows, and rotates as the bellows expands and contracts. In a damper thermostat that has a damper that opens and closes by transmitting the rotation of A damper characterized in that the damper opening is set to a position where the lever contacts the lever at a position where the damper does not contact the duct opening, and the damper is rotated about the contact portion as a fulcrum when the damper contacts the duct opening surface. thermostat.