JPH0638225Y2 - safety valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a safety valve to be mounted in a refrigerant circuit or a boiler circuit of a car air conditioner, and in particular, the air outlet of the safety valve is covered with a waterproof dust seal. A notch for venting air is provided in the central portion of the dust seal.

[Prior Art] Conventionally, this type of safety valve is mounted on a compressor or the like of a car air conditioner to protect the compressor and the circuit when the pressure in the refrigerant circuit rises abnormally. This will be described with reference to FIG.

In a conventional safety valve, a valve seat assembly in which a valve seat b is incorporated into a valve body a, a plate having a spring and an outlet are sequentially housed in a valve seat portion in a body, and means for caulking an upper opening edge of the body is used. It was fixed by.

Next, the operation will be described. When the pressure in the refrigerant circuit becomes higher than the set pressure, the valve body assembly overcomes the pressing force of the spring and moves away from the valve seat, releasing the refrigerant gas into the atmosphere, and when the pressure in the circuit drops, it returns by the force of the spring. To do.

[Problems to be solved by the invention] The conventional safety valve is configured as described above, and the air outlet remains open. For this reason, foreign matter and corrosive substances intrude from the air outlet, which adversely affects the performance such as operation, valve leakage, and discharge flow rate. In addition, it is difficult to determine whether the safety valve has been activated because no trace remains even if the safety valve is activated.

The present invention has been made to solve the above problems, and an object thereof is to make it possible to permanently maintain the original performance of the safety valve and to easily determine whether or not the safety valve is operating.

[Means for Solving Problems] A safety valve according to the present invention comprises a waterproof dust seal provided with a notch for venting air on the upper surface of the plate so as to cover the central portion of the air outlet provided on the plate.
It is affixed with an adhesive force capable of peeling when the safety valve operates.

[Operation] The dust seal according to the present invention prevents foreign substances and corrosive substances from entering, peels off the dust seal when the safety valve operates, and prevents the safety valve from operating when the safety valve does not operate.
For example, even if the air in the safety valve expands due to the heat of the compressor or the like, the air is gradually discharged from the air vent notation, so that the dust seal does not come off.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

In the body, a valve body assembly in which a valve seat b having elasticity is attached to the valve body a by vulcanization adhesion and the like, a spring, and a plate having a blowout port in the center are sequentially housed, and the body has an upper surface on the plate. Has a water-resistant dust seal attached so as to cover the air outlet in the center of the plate. A safety valve is obtained by caulking the upper opening edge of the body. Of course, it goes without saying that the spring strength is selected in order to set the desired starting pressure. The dust seal has a bonding strength that prevents foreign matter, corrosive substances, and the like from entering the body during normal mounting, and is blown off by the discharge gas during valve operation due to an abnormal increase in refrigerant gas pressure.

[Effect] As described above, according to the present invention, since the dust seal having the notch for venting air is attached to the air outlet of the safety valve with an appropriate adhesive force, the corrosive substance is prevented from entering the safety valve. The basic performance can be maintained permanently, and when the safety valve operates, the dust seal can be peeled off to facilitate the determination of whether or not the safety valve is activated.

[Brief description of drawings]

FIG. 1 is a safety valve according to an embodiment of the present invention, in which (a) is a top view and (b) is a vertical side view. FIG. 2 shows a conventional safety valve, in which (a) is a top view and (b) is a vertical side view. Body, valve disc assembly, a valve disc, b valve seat,
Spring, plate, outlet, dust seal, notch for venting air.

Claims (1)

[Scope of utility model registration request] 1. A valve seat assembly in which a valve seat b is incorporated in a valve body a, a spring, and a plate having a blowout port in the center are sequentially housed in a valve seat portion in the body, and an upper opening edge of the body is caulked or the like. In a safety valve that can be set to an arbitrary blowing start pressure by fixing with, a waterproof dust seal having a notch for venting air in the center is provided on the upper surface of the outlet of the plate, and can be peeled off when the safety valve operates. A safety valve characterized by being attached by adhesive force.