JPH048371Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flow checker used for monitoring the flow rate of a suction type gas detector.

(Prior art) Conventionally, suction type gas detectors generally place a gas detection element inside the gas chamber and detect gas by introducing it into the gas chamber. However, the sensitivity of the gas detection element depends on the Since it depends on the flow rate of the gas introduced, it is used with a permissible range of flow rate determined.

Also, gas flow rate changes not only due to pump performance but also due to filter clogging.
It was necessary to monitor both pump deterioration and filter clogging. As a monitoring method, as shown in Figure 1, a filter 2 is connected to the inlet side of the gas detector 1, and a transparent container 3 is filled with paraffin or water 4, and the gas outlet is submerged in water. The pump was checking to see if it was suctioning gas normally by monitoring the air bubbles coming up.

(Problem that the invention aims to solve) With this method, it is not possible to quantitatively monitor the gas flow rate, and the only way to replace the filter is to set a replacement period or visually judge the amount of bubbles. Furthermore, since the filter and the flow detection mechanism are located in separate locations, monitoring and handling thereof is troublesome.

Another method is to connect a flow meter to monitor the flow rate, or to connect a flow meter that can take out an electrical output to monitor the flow rate, but these methods have the disadvantage of being expensive.

In order to solve this problem, the
As shown in Japanese Patent No. 38209, a flowmeter with a trap has been proposed, which includes a float type flowmeter on the upper part of a base body connectable to a sampling gas pipe line and a filter on the lower part. According to this device, by connecting one member to the sampling pipe line, it is possible to purify the sampling gas and monitor the gas flow. However, since the sampling gas flows above and below the substrate, the flow path This not only complicates the configuration, but also requires the removal of two covers during inspection, which is time-consuming.

(Means for Solving the Problems) The flow checker used in the suction type gas detector of the present invention includes a base body that can be inserted into a gas sampling line connecting a gas chamber and a pulsating pump;
A gas inlet and a gas outlet provided in this base,
A hole formed in the base body to communicate with the gas outlet; a passage formed in the base body to communicate with the gas inlet; a float-type flow rate display mechanism connected to the passage through a filter;
The float type flow rate display mechanism is comprised of a glass container containing the flow rate display mechanism and a filter and detachably and airtightly attached to the base body, and the float type flow rate display mechanism has one end connected to the port and the other end connected to one end of the filter. A vertical glass tube, a float loosely fitted into the glass tube, a stopper provided at the lower end of the glass tube, and an upper spring-like stopper extending from the upper end of the glass tube to approximately the middle of the glass tube. and a mechanism for visually shielding the lower part of the glass tube.

(Function) According to the flow checker used in the suction type gas detector of the present invention, when the flow rate of the fluid flowing through the gas sampling pipe exceeds a predetermined amount, the float presses the spring-like stopper in the glass cylinder. When the flow rate falls below a predetermined amount, the float separates from and contacts the lower end of the spring-like stopper and vibrates. When the flow rate falls significantly below the predetermined amount, the float moves through the hole in the lower flange. It falls inward and becomes invisible.

(Example of idea) Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 2, a pulsating pump 6 is arranged downstream of a gas chamber 5 in which a gas detection element is arranged, and a glass container 7 containing a filter 2 is arranged upstream of the gas chamber 5. Furthermore, a flow rate detection mechanism 8 is inserted in the glass container 7 downstream of the filter 2 and upstream of the gas chamber 5.

As shown in FIG. 3, a gas inlet 18 and a gas outlet 13 that can be inserted into a gas sampling pipe are bored on both sides of the base 19, and a transparent glass container 7 is fixed to the lower part. A joint portion 19a is formed, and a passage 19b communicating with the gas outlet 13 is provided in the center, and a flow path 19c communicating with the gas inlet 18 is provided on the outer peripheral side. The flow rate detection mechanism (flow rate display part) 8 has an upper flange 1 having a connecting part 14a that can be inserted airtightly into a passage 19b on one side.
4 and the column 1 through a lower flange 15 having a connection part 15a connectable to one end of the filter 2 on the other side.
6 and 16 to sandwich the glass cylinder 12 and move the glass cylinder 12 to a position where it can be seen from the outside.
The lower end 17 of the spring-like stopper 10 extends from the upper part to approximately the middle part thereof, and the lower end 17 of the spring-like stopper 10 is provided to prevent the float 9 from falling off when the float is not in operation.
1, and a movable float 9 is accommodated between these stoppers 10 and 11.
2 is a filter, and a through hole is bored in the center of one end of the filter material to connect the lower flange 15 to the connection part 15a.
and are removably and airtightly connected. 7 is a transparent glass container with a flow rate detection mechanism 8 and a filter 2
It has a size that accommodates the filter 2 and has a space S at the lower end of the filter 2, and the opening side is airtightly fixed to the lower end of the base body 19 by a retaining ring 20. As a result, the other end of the filter 2 is communicated with the passage 19c.

Since the flow checker of the present invention has the above-described configuration, when the pump 6 is operated, gas enters through the gas inlet 18 of the glass container 7, enters the glass container 7, and then enters the filter 2. The gas enters the glass cylinder 12 through the central passage hole of the lower flange 15, and while pushing up the float 9, the gas flows through the gap between the inner wall of the glass cylinder 12 and the float 9, through the small hole in the center of the upper flange 14, and the gas outlet 1.
3 and reaches the gas chamber 5 of the gas detector 1, and is exhausted from the exhaust valve of the pump 6. However, if the gas inlet 18 is blocked or the filter 2 becomes clogged, the gas flow rate will decrease. Lowering, the float 9 begins to fall under its own weight within the glass cylinder 12.

For example, when the flow rate is 1.5/min or more, the float 9 floats inside the glass cylinder 12, presses the lower end 17 of the spring-like stopper 10, and comes to rest in the upper part of the glass cylinder 12.

When the flow rate decreases from 1.5/min to 0.8/min, the float 9 vibrates in contact with and away from the lower end of the spring-like stopper 10 in the glass cylinder 12, as the pump 6 is a pulsating pump. becomes.

When the flow rate further decreases to 0.8/min or less, the float 9 falls onto the stopper 11 due to its own weight, enters the center hole of the lower flange 15, and becomes invisible from the outside.

According to the flow checker of the present invention, when the float 9 pushes up the lower end 17 of the spring-like stopper 10 to the maximum and is positioned above the glass cylinder 12, the pump operation, filter clogging, etc. are in a normal state. If it is vibrating at a visible position below approximately the middle of the glass cylinder, it indicates that the pump is nearing deterioration or the filter is about to become clogged, so use this to determine the need for inspection. can do.

It goes without saying that the relationship between flow rate and float floating can be freely changed by appropriately selecting the inner diameter of the glass cylinder and the weight of the float.

If the filter 2 becomes clogged after long-term use, remove the glass container 7, pull the filter 2 downward to remove it from the connection, and then insert a new filter into the connection 15a to replace it. do. At the same time, after inspecting the exposed flow rate display mechanism 8 and removing moisture and dust accumulated in the glass container 7, the glass container 7 is fixed to the base body 19 again.

Experimental examples will be explained below.

Float 9 has a diameter of 4.4m/m and a weight of 80mgr.
According to the results of experiments using a resin float of
At a flow rate of 1.5/min or more, the float 9 pushed up the lower end 17 of the stopper 10 to the maximum, indicating that the pump was normal.

When the pump flow rate was changed within the range of 1.5/min to 0.8/min, the float 9 vibrated away from and in contact with the stopper 10 to notify that the flow rate had changed.

When the flow rate further decreased to below 0.8/min, the float 9 fell onto the stopper 11 due to its own weight and was no longer visible from the outside.

When experimenting with a metal float 9 with a diameter of 4.4 m/m and a weight of 590 mgr, the inner diameter of the glass cylinder was
Only in the case of 4.9m/m and 4.8m/m, the state is the same as that of a resin float at a flow rate of 1.5/min or more, and the float vibrates when the flow rate is between 1.5/min and 1.2/min, but the float completely stops when the flow rate is between 1.5/min and 1.2/min. fell on. When the inner diameter of the glass cylinder is 5.2m/m, the gap between the glass cylinder and the float becomes large, and
The weight of the float was also heavier than that made of resin, so the float did not float to the surface.

(Effect of idea) The present invention has the following effects.

1. The filter, which is prone to clogging, and the float-type flow rate display mechanism, which requires occasional inspection, can be seen from the outside at all times, and the filter can be replaced and the flow rate display mechanism can be adjusted by removing the glass container once. .

2. Since a pulsating pump is used as the gas suction pump 6, the float 9 floats up according to the gas flow rate, and while the lower end 17 of the upper end stopper 10 is stationary at the maximum pushed-up position, it descends due to its own weight and closes the lower flange. There are three states: the state in which the pump falls into the hole of the upper end stopper 10 and becomes invisible, and the state in which it vibrates when it is separated from or in contact with the lower end 17 of the upper end stopper 10. It is very easy to visually check whether the filter is about to deteriorate or become clogged.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional flow checker, FIG. 2 is an explanatory diagram of the flow checker of the present invention, and FIG. 3 is an explanatory sectional view of the float and flow rate detection mechanism. 1...Gas detector, 2...Filter, 3...
Transparent container, 4... Paraffin or water, etc., 5... Gas chamber, 6... Pump, 7... Glass container, 8... Flow rate detection mechanism, 9... Float, 1
0, 11...Stopper, 12...Glass cylinder,
13... Gas outlet, 14... Upper flange, 1
5... Lower flange, 16... Pillar, 17... Lower end, 18... Gas inlet, 19... Base.

Claims (1)

[Scope of utility model registration request] A base body that can be inserted into a gas sampling pipe connecting a gas chamber and a pulsating pump, a gas inlet and a gas outlet provided in this base, and a hole formed in the base so as to communicate with the gas outlet. and a float-type flow rate display mechanism having a passage formed in the base body so as to communicate with the gas inlet, an outlet thereof connected to the passage, and an inlet thereof connected to the passage via a removable filter. , comprising the flow rate display mechanism and a glass container containing a filter and detachably and airtightly attached to the base body, the float type flow rate display mechanism having one end connected to the port and the other end connected to one end of the filter. a vertical glass tube, a float loosely fitted into the glass tube, a stopper provided at the lower end of the glass tube, and an upper spring-like shape extending from the upper end of the glass tube to approximately the middle of the glass tube. A flow checker for use in a suction type gas detector, comprising a stopper and a mechanism for visually shielding the lower part of the glass tube.