JPH0750692Y2 - Sludge adhesion prevention device for detector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, when detecting the pressure of a fluid containing impurities, the impurities in the fluid adhere as sludge to the measurement surface of the detector in contact with the fluid. The present invention relates to a device for preventing sludge adhesion of a detector that does not prevent it.

[Prior Art] In an internal combustion engine such as a diesel engine or a gasoline engine, the combustion pressure may be measured in order to know the combustion state.

An example of the conventional device used for measuring the combustion pressure of such an internal combustion engine will be described with reference to FIG. 5. Reference numeral 1 is an indicator valve, and the left end of FIG. 5 is attached to the internal combustion engine. The fluid to be measured of the internal combustion engine is introduced into the guide hole 2. Indicator valve 1
A hole 3 is provided on the upper surface of the device, and the main valve 4 can be opened and closed between the guide hole 2 and the hole 3 so that they can be connected or disconnected.

The tip of an adapter 5 is inserted into the hole 3 of the indicator valve 1, and is fixed to the indicator valve 1 by a tightening nut 6. A detector mounting hole 7 is provided on the base end side of the adapter 5, and the detector mounting hole 7 is made to communicate with the hole 3 of the indicator valve 1 from the tip of the adapter 5 by a guide hole 8. . A detector 9 is inserted into the detector mounting hole 7 of the adapter 5 and is fixedly supported by the adapter 5 by a holding bolt 10.

When the main valve 4 is opened, the fluid to be measured from the internal combustion engine, which has entered the indicator valve 1 through the guide hole 2, reaches the measurement surface 11 of the detector 9 through the guide hole 8. Then, the pressure and the like are detected by the detector 9 and sent as an electric signal. Depending on where the indicator valve 1 is attached to the internal combustion engine,
The type of the fluid to be measured introduced into the guide hole 2 is any one of injected fuel, mixed gas, scavenging gas, etc., and the detector 9 correspondingly corresponds to the fuel injection pressure transmitter and the cylinder pressure transmitter. , Scavenging pressure transmitter, etc. are used. Thereby, the combustion pressure is measured, and the combustion state of the internal combustion engine can be monitored or controlled.

[Problems to be Solved by the Invention] Since the fluid to be measured of the internal combustion engine, which is guided to the measurement surface 11 of the detector 9, contains impurities such as carbon and sulfur,
This impurity deposits on the measuring surface 11 of the detector 9 as sludge, and if the main valve 4 is continuously opened, the sludge accumulates on the measuring surface 11 of the detector 9 so that the pressure and the like cannot be accurately detected. Become.

For this reason, the main valve 4 must be closed, the detector 9 must be removed from the adapter 5, and the measurement surface 11 must be washed, automatic measurement cannot be performed continuously for a long time, and opening and closing of the main valve 4 is dangerous and troublesome. It was such a thing.

The present invention is intended to prevent impurities in the fluid to be measured from accumulating on the measurement surface of the detector so that accurate measurement can be performed for a long time.

[Means for Solving the Problems] According to the present invention, a detector mounting hole extending in a direction orthogonal to the guide hole is provided in an intermediate portion of an adapter having a guide hole through which a fluid to be measured flows. The detector is attached so that its measurement surface is parallel to the flow of the fluid to be measured flowing in the guide hole and is flush with the wall surface of the guide hole, and on the discharge side of the fluid to be measured flowing in the adapter. And a device for opening and closing a guide hole in the adapter, which is a device for preventing sludge adhesion of a detector.

[Operation] When the fluid discharge side of the guide hole is opened, the fluid to be measured flows at high speed in the guide hole, and the measuring surface of the detector, which is kept flush with the wall surface of the guide hole in the middle of the guide hole, The measuring fluid will be cleaned.

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

In FIG. 1, the indicator valve 1 is the same as the conventional one, the left end is attached to the internal combustion engine, and the fluid to be measured of the internal combustion engine is introduced into the guide hole 2 and the hole 3 on the upper surface. The main valve 4 can be connected to or disconnected from the guide hole 2 by opening and closing the main valve 4.

The lower end 21 of the adapter 20 constituting the device for preventing sludge adhesion of the detector according to the present invention is inserted into the hole 3 of the indicator valve 1 and is fixed to the indicator valve 1 by the tightening nut 6. . Inside the adapter 20, a guide hole 22 is provided in the vertical direction, and the lower end of the guide hole 22 opens at the lower surface of the lower end portion 21 of the adapter 20 and communicates with the guide hole 2 of the indicator valve 1. Guide hole
22 penetrates the inside of the adapter 20 and is adapted to be connected to a blow valve 23 attached to the upper end of the adapter 20, and by opening and closing the valve body 24 of the blow valve 23,
The upper end of the guide hole 22 is opened or shut off from the atmosphere.

In the middle portion of the adapter 20, there is provided a detector mounting hole 25 extending in a direction intersecting the guide hole 22 at a right angle. As shown in FIG. It is inserted in the direction and can be fixedly supported by the presser bolt 26. Insert the detector 9 into the detector mounting hole 25 and press the bolt.
When fixedly supported by 26, the measuring surface 11 of the detector 9 has a guide hole 22
It is held so that it is flush with the wall surface of.

Although the flow of the fluid to be measured is constantly generated in the guide hole 22 of the adapter 20, since the measuring surface 11 of the detector 9 is parallel to the flow of the fluid to be measured, sludge of impurities in the fluid to be measured adheres. The measurement surface 11 is kept flush with the wall surface of the guide hole 22 not at the end of the guide hole 22 but at the intermediate portion.
Sludge is less likely to accumulate on 11. When sludge adheres to the measurement surface 11 of the detector 9, the blow valve 23
When the valve body 24 is opened, the fluid to be measured is released from the blow valve 23 into the atmosphere, and the sludge adhering to the measurement surface 11 of the detector 9 is blown off by the flow velocity of the fluid to be measured flowing through the guide hole 22 at this time. Be done. Thus, even if the sludge adheres to the measurement surface 11 of the detector 9 by cleaning the flow of the fluid to be measured, it can be easily removed.

3 shows a case where the main valve 4 shown in FIG. 1 is not provided inside the indicator valve 1, and the structure relating to the adapter 20 is the same as that shown in FIG.

FIG. 4 shows another embodiment of the present invention. Instead of the blow valve 23 of FIG. 1, a blind lid 27 is screwed onto the upper end of the guide hole 22 to be mounted. In this embodiment, the blind lid 27 is removed from the adapter 20 and the upper end of the guide hole 22 is opened to cause a flow of the fluid to be measured on the measurement surface 11 of the detector 9 to clean the measurement surface 11. It is something to do.

[Advantages of the Invention] In the present invention, the measurement surface of the detector is positioned along the flow of the fluid to be measured, and the measurement surface of the detector can be cleaned by the fluid to be measured. Impurities in the fluid to be measured do not accumulate on the measurement surface, accurate measurements can be made over a long period of time, and maintenance intervals are lengthened to save labor.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a longitudinal sectional view of the apparatus shown in FIG. 1 attached to different indicator valves. FIG. 4 is a vertical sectional view of another embodiment of the present invention, and FIG. 5 is an example of a conventional device. 9 is a detector, 11 is a measurement surface, 20 is an adapter, 22 is a guide hole, 23
Is a blow valve, 25 is a detector mounting hole, and 27 is a blind lid.

Claims (1)

[Scope of utility model registration request] 1. A detector mounting hole extending in a direction orthogonal to the guide hole is provided in an intermediate portion of an adapter having a guide hole for flowing a fluid to be measured, and the detector mounting hole has a detector whose measuring surface is The guide hole in the adapter is opened / closed on the discharge side of the fluid to be measured flowing in the adapter in parallel with the flow of the fluid to be measured in the guide hole and flush with the wall surface of the guide hole. A device for preventing sludge adhesion of a detector, which is provided with a device for