JPH0522176Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The safety device for the door opening/closing mechanism for a pressure vessel according to this invention is attached to the door opening/closing mechanism of a pressure vessel such as a steam sterilizer, and is designed to be attached to a door opening/closing mechanism of a pressure vessel such as a steam sterilizer. This prevents the danger of opening the door with any residue remaining.

(Prior art) In hospitals and various research institutes, for example,
Steam sterilizers such as those disclosed in Publication No. -127960 are widely used.

As shown in Fig. 2, this steam sterilizer is equipped with a door 2 at the opening of a pressure vessel 1 into which high-temperature, high-pressure steam can be fed while objects to be sterilized are housed. It can be opened and closed by operating a handle 3 provided at the front.

As shown in FIGS. 3 and 4, the opening/closing mechanism using the handle 3 has a hub 5 that rotates by a predetermined angle (for example, 90 degrees) centered on a shaft 4 provided on the front surface of the door 2, and is engaged with the tip of the shaft 4. The handle 3 is configured to be rotated by the predetermined angle, or to be moved toward or away from the front surface of the door 2.

A plurality of radiation rods 6, 6 are provided on the outer circumference of the hub 5.
The base end portion of the radiation rod 6 is swingably supported, and the tip portion of each radiation rod 6, 6 passes through a guide 7 provided near the outer periphery of the front surface of the door 2, and projects from the outer periphery of the door 2. I am free to do so.

When closing the door 2, rotate the hub 5 in an appropriate direction so that the tips of the radiation rods 6, 6 are aligned with the door 2.
The door 2 is moved toward the opening of the pressure vessel 1 so that the door 2 does not protrude from the outer peripheral edge of the pressure vessel 1.

Once the opening is closed by the door 2, the tips of the radiation rods 6, 6 are made to protrude from the outer periphery of the door 2 by rotating the handle 3 in the opposite direction to the above case.
The tip of each radiation rod 6, 6 is inserted into a locking groove 8 provided around the entire circumference of the opening periphery of the pressure vessel 1 to prevent the door 2 from separating from the pressure vessel 1.

If you further rotate the handle 3 from this state,
The hub 5 is pushed toward the front of the door 2 by the base end of the handle 3, and the plurality of radiation rods 6, 6 whose base ends are supported by the hub 5 are moved according to the principle of a screw. The door 2 is then pressed against the front surface of the pressure vessel 1 to maintain airtightness inside and outside the pressure vessel 1.

When opening the door 2, the tips of the radiation rods 6, 6 are retracted from the outer periphery of the door 2 by rotating the handle 3 in the opposite direction to when it is closed.

By the way, in the pressure vessel door opening/closing mechanism configured as described above, there is a risk of accidentally opening the door 2 when high pressure gas such as water vapor remains inside the pressure vessel 1. In order to prevent this, the handle 3 must be
It is necessary to provide a safety device that prevents rotation in the opening direction.

As such a safety device, the above-mentioned Utility Model No. 59-
127960 discloses a structure as shown in FIGS. 3 to 5.

The safety device disclosed in this publication is the handle 3
and a ratchet claw 10 whose base end is pivotally supported on the front surface of the door 2 and whose tip is freely engageable with the ratchet teeth 9 to prevent rotation of the handle 3 in the opening direction when engaged. , a bellows 11 that expands by introducing the pressure inside the pressure vessel 1, and a rod 12 that transmits the movement of the bellows 11 to the ratchet pawl 10.

When the pressure gas remains in the pressure vessel 1, the bellows 11 expands due to this pressure, and the rod 12 rotates the ratchet pawl 10 upward, so that the tip of the ratchet pawl 10 and the rod 12 rotate upward. Since the handle 3 is engaged with the ratchet teeth 9, the handle 3 cannot be rotated in the opening direction, thereby preventing the door 2 from being opened by mistake.

In addition, in order to avoid the increase in parts cost and the trouble of assembly due to the provision of heat-resistant bellows 11 and pressure piping, the relationship between the ratchet pawl 10 and the ratchet teeth 9 when the pressure inside the pressure vessel 1 increases is reduced. The meeting,
Instead of the bellows 11, a safety device using a solenoid is also used.

That is, as shown in FIG. 6, the output rod 14 of the solenoid 13 provided above the ratchet claw 10 and the intermediate portion of the ratchet claw 10 are
When the solenoid 13 is energized, the ratchet pawl 10 is rotated upward so that the tip of the ratchet pawl 10 and the lower edge of the ratchet tooth 9 can be engaged with each other.

A pressure sensor for detecting the pressure inside the pressure vessel 1 is provided in the pressure vessel 1 (see FIGS. 2 and 3),
When the pressure inside the pressure vessel 1 detected by this pressure sensor is above a certain value, a controller (not shown) energizes the solenoid 13, engages the ratchet pawl 10 with the lower end of the ratchet tooth 9, and 3 is prevented from rotating in the opening direction.

(Problems to be Solved by the Invention) However, as described above, in the case of the safety device using the solenoid 13 adopted for the purpose of reducing component costs and simplifying assembly work, the following disadvantages occur.

That is, if a power outage occurs while pressure gas remains in the pressure vessel 1, the energization to the solenoid 13 is also stopped, and the ratchet pawl 10 descends due to its own weight, causing the ratchet pawl 10 and the ratchet teeth 9 to fall.
It becomes disengaged.

Therefore, in the event of a power outage, the safety device will no longer function, and the door 2 will be able to be opened even though pressure gas remains in the pressure vessel 1, which is dangerous.

The safety device of the pressure vessel door opening/closing mechanism of this invention is:
This solves the above-mentioned inconveniences.

(Means for solving the problem) The safety device of the pressure vessel door opening/closing mechanism of the present invention is as follows:
Similar to the conventional safety device described above, as shown in Figs. 3 and 4, a handle rotates around a shaft 4 provided at the front of the door 2 in order to open and close the door 2 provided at the opening of the pressure vessel 1. 3, a ratchet tooth 9 fixed to this handle 3, a proximal end pivoted to the front surface of the door 2, and a tip that can be freely engaged with the ratchet tooth 9, so that when engaged, the handle 3 rotates in the opening direction. It has a ratchet pawl 10 that prevents this.

However, in the case of the safety device of the present invention, unlike the case of the conventional safety device described above, the ratchet pawl 10
As shown in FIG.
It can be freely engaged with the upper edge of the.

Further, a solenoid 13 for engaging and disengaging the ratchet pawl 10 and the ratchet teeth 9 is connected to the ratchet pawl 1.
The ratchet pawl 10 is provided above the ratchet tooth 9 and rotated upward as electricity is applied to disengage the distal end of the ratchet pawl 10 from the upper end of the ratchet tooth 9.

The pressure vessel 1 (see Figures 2 and 3) is provided with a pressure sensor (not shown) for detecting the pressure within the pressure vessel 1, and an electric current indicating the pressure within the pressure vessel 1 detected by the pressure sensor is provided. The configuration is such that the signal is input to a controller, also not shown.

This controller energizes the solenoid 13 only when the pressure inside the pressure vessel 1 is below a specified value, rotates the ratchet pawl 10 connected via the cable 15, etc. upwards, and rotates the ratchet pawl 10 upward. 10 and the ratchet teeth 9 are disengaged from each other.

(Function) In the case of the safety device for the pressure vessel door opening/closing mechanism of the present invention configured as described above, when the pressure inside the pressure vessel 1 is low, the controller energizes the solenoid 13 to open the ratchet pawl 10. In order to disengage the tip of the ratchet pawl 10 from the upper edge of the ratchet tooth 9, rotate the handle 3 in the opening direction. This makes it possible to open the door 2.

Furthermore, if the pressure inside the pressure vessel 1 is unsuitably high for opening the door 2, the controller will not energize the solenoid 13 and the ratchet pawl 10 will rotate downward due to its own weight. The tip of the ratchet pawl 10 and the upper edge of the ratchet tooth 9 are engaged as shown in FIG. 1, and the handle 3 with the ratchet tooth 9 fixed
The door 2 cannot be rotated in the opening direction (counterclockwise in Figure 1), and the risk of opening the door 2 inadvertently even though pressure gas remains inside the pressure vessel 1 can be prevented. .

Furthermore, during a power outage, the solenoid 13 is not energized and the ratchet pawl 10 rotates downward under its own weight, causing the tip of the ratchet pawl 10 and the upper edge of the ratchet tooth 9 to move as shown in FIG. When engaged, the handle 3 cannot be rotated in the opening direction regardless of whether pressure gas remains in the pressure vessel 1.

Therefore, even if a power outage occurs while pressure gas remains in the pressure vessel 1, the danger of opening the door 2 inadvertently can be prevented.

(Effect of the invention) The safety device of the pressure vessel door opening/closing mechanism of the invention is as follows:
Since it is configured and operates as described above, it is a safety device using a solenoid that can be produced at a relatively low cost, and yet safety is guaranteed during power outages.

[Brief explanation of the drawing]

Fig. 1 is a front view of the essential parts of the safety device of the pressure vessel door opening/closing mechanism of the present invention, Fig. 2 is a perspective view of a steam sterilizer incorporating a pressure vessel to which this safety device is attached, and Fig. 3 is the main part of the safety device of the present invention. 2 is a sectional view taken along line A-A in Fig. 2, Fig. 4 is a perspective view of the door portion incorporating the first example of the conventional safety device, Fig. 5 is a perspective view of the bellows portion, and Fig. 6 is the perspective view of the door portion incorporating the first example of the conventional safety device. FIG. 2 is a diagram similar to FIG. 1, showing two examples; 1...Pressure vessel, 2...Door, 3...Handle,
4... Shaft, 5... Hub, 6... Radiation rod, 7... Guide, 8... Locking groove, 9... Ratchet tooth, 10
... Ratchet claw, 11 ... Bellows, 12 ...
Rod, 13... Solenoid, 14... Output rod, 15... Cable.

Claims (1)

[Scope of utility model registration request] In order to open and close the door provided at the opening of the pressure vessel, there is a handle that rotates around an axis provided in front of the door, and a ratchet tooth fixed to this handle.
a ratchet claw whose base end is pivotally supported on the front surface of the door and whose tip can be freely engaged with the upper edge of the ratchet tooth to prevent rotation of the handle in the opening direction when engaged;
a solenoid provided above the ratchet pawl, which rotates the ratchet pawl upward when energized to disengage the ratchet pawl from the ratchet teeth; and a pressure sensor that detects the pressure inside the pressure vessel. A safety device for a door opening/closing mechanism for a pressure vessel, comprising a controller that energizes the solenoid only when the pressure inside the pressure vessel detected by the pressure sensor is below a specified value.