JPH0144751Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a shiatsu pressure device valve device installed in the middle of a combustion gas passage connecting a combustion chamber and a shiatsu device in a diesel engine or the like.

[Conventional technology]

A finger pressure device is a device that is permanently installed in a diesel engine, for example, as a device for measuring the cylinder pressure, and FIG. 2 shows a conventional example thereof.

In FIG. 2, reference numeral 1 denotes an acupressure device valve device, and this acupressure device valve device is used in combination with the acupressure device 2, and serves as the main valve of the acupressure device 2. The acupressure device valve device 1 includes a valve body 8 and a valve seat 3 attached to the valve body 8.
A valve stem 4 that can be raised and lowered by a handle 9 is arranged in the hollow part 5 of the valve body 8, and when the tip of the valve stem 4 comes into contact with the seat surface 3a of the valve seat 3, the valve device 1 is activated. It's starting to close.

The acupressure device valve device is normally closed, thereby blocking the combustion gas passage connecting the combustion chamber of a diesel engine or the like and the acupressure device 2, thereby preventing combustion gas leakage (drop in cylinder pressure). ing. (At this time, the acupressure device 2 is removed from the acupressure device valve device 1.) When measuring the cylinder pressure, turn the handle 9 to raise the valve stem 4, and insert its tip into the seat surface 3a of the valve seat 3. The acupressure valve device 1 is opened by releasing the acupressure device 1, thereby introducing combustion gas into the acupressure device 2 through the passage 18 and releasing the spring 10 therein.
is pushed up, and the value of the cylinder pressure is calculated based on the height of the pushed up spring 10. In addition, each time the cylinder pressure is measured, the acupressure device 2 is connected to the acupressure device valve device 1.
can be attached to.

[The problem that the idea aims to solve]

However, the conventional acupressure valve device has the following problems. After measuring the cylinder pressure, the acupressure device valve device 1 is closed again, but as a result, combustion gas remains in the hollow part 5 of the valve body 8 and the combustion gas passage, and as it cools rapidly, the sulfur in the combustion gas combines with oxygen and hydrogen to produce sulfuric acid. The generated sulfuric acid destroys the seat surface 3a of the valve seat 3 due to sulfuric acid corrosion.
As a result, it was necessary to frequently maintain and replace the acupressure device valve device 1.

The present invention solves the above problems, and aims to provide a device that can prevent sulfuric acid corrosion of acupressure valves.

[Means to solve the problem]

For this reason, the present invention provides a method for attaching a heat-insulating cover to the shiatsu pressure device valve device, which is installed in the middle of the combustion gas passage connecting the combustion chamber and the shiatsu device, using the amount of heat in the combustion chamber. It is characterized by

[Effect]

According to the above means, the combustion gas remaining in the acupressure device valve device is prevented from rapidly cooling down by covering the acupressure device valve device with a heat-retaining cover that utilizes the heat generated from the engine, a so-called combustion chamber. This makes it possible to prevent sulfuric acid corrosion.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1. 1 is a finger pressure valve device, 3 is a valve seat, 4 is a valve stem, 19 is a spring, 6 is a cap nut, 7 is a lid, and 8 is a valve body. , 9 is a handle connected to the valve stem, 19 is a bolt for fastening the flange metal fitting 16 to the cylinder head 14 of the engine, 11 is a protection tube, and 13 is a chain. Reference numeral 15 denotes a cylindrical cover that covers the acupressure device valve device 1, and is made of a heat insulating material such as asbestos or the like to keep the inside of the space 17 in which the acupressure device valve device 1 is housed at a required temperature. The acupressure device valve device 1 is permanently installed in the engine as a device for measuring the cylinder pressure of a diesel engine, for example, and the acupressure device 2 (see Fig. 2) is attached to the acupressure device valve device 1 only when measuring the pressure in the cylinder. .

The valve stem 4 of the acupressure device valve device 1 is normally closed, but when measuring the cylinder pressure, the valve stem 4 is raised by turning the handle 9 and its tip is separated from the seat surface 3a of the valve seat 3. Open the acupressure device valve device 1. As a result, combustion gas is introduced into the acupressure device 2 through the passage 9 and pushes up the spring 10 inside the acupressure device 2, and the value of the cylinder pressure is calculated based on the height of the pushed up spring 10.

When the measurement of the cylinder pressure is completed, the above procedure is performed in reverse, and the acupressure device 2 is separated from the acupressure device valve device 1 and thoroughly cleaned.

Also, during measurement, be sure to open and inspect the shiatsu pressure device valve device 1 before installing the shiatsu device 2, and even if some sulfuric acid remains in the shiatsu device valve device 1, this should be removed into the atmosphere using gas pressure. Blow, then acupressure 2
I am trying to install it.

When the measurement of the cylinder pressure is completed as described above, the acupressure device valve device 1 is covered with the cylindrical asbestos cover 11. By covering the acupressure device valve device 1 with a cylindrical asbestos cover 11, the heat of the engine, the so-called combustion chamber, is kept warm within the cylindrical asbestos cover 11, and the space 17 is
Since the internal temperature can be maintained at approximately 140℃ (experimental value) and the combustion gas inside the acupressure device valve device 1 is not cooled,
No sulfuric acid corrosion occurs.

[Effect of idea]

As detailed above, according to the present invention, the shiatsu pressure device, in which sulfur gas tends to remain, is heated by retaining the heat in the combustion chamber through the cylindrical heat insulating cover that covers the shiatsu device valve device. It creates a condition in which the sulfur inside is difficult to combine with oxygen and hydrogen, inhibits the production of sulfuric acid, and prevents sulfuric acid corrosion. Therefore, the valve life can be significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a corrosion prevention device for an acupressure valve device according to an embodiment of the present invention, and FIG. 2 is a corresponding view of FIG. 1 showing a conventional example. 1... Acupressure device valve device, 2... Acupressure device, 3... Valve seat, 4
...Valve stem, 11...Cover.

Claims (1)

[Scope of utility model registration request] In a shiatsu pressure device valve device installed in the middle of a combustion gas passage connecting a combustion chamber of an engine and a shiatsu device, the shiatsu device valve device is characterized in that a cover for heat insulation using the heat quantity of the combustion chamber is attached to the shiatsu device valve device. Corrosion prevention device for acupressure valve.