JP2912862B2 - Liquefied gas outflow prevention valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas outflow prevention valve which functions reliably.

[0002]

A device for supplying a liquefied gas (liquid) from a container such as a cylinder to the evaporator and generating the gas is provided in the evaporator with an outflow prevention valve in order to avoid danger due to excessive supply. Is provided. However, most of the valves currently used close when the liquid level of the liquefied gas in the evaporator rises, but when the liquid level subsequently drops, the valve body automatically drops and opens. It is a structure to valve.

In the case where such an outflow prevention valve is incorporated in a liquefied gas evaporator, once the valve is closed, gas supply to a consumer is cut off. Means disappear. However, with the conventional structure described above, gas is automatically supplied after the fire has extinguished, and if safety confirmation such as preparation for resumption has not yet been completed on the downstream side, it is very difficult. It is a danger.

The present invention is intended to solve such a problem. When the supply of gas is interrupted once due to the rise of the liquid level in the evaporator, the valve is closed until resetting is performed. It is an object of the present invention to provide a liquefied gas outflow prevention valve that can be maintained.

[0005]

According to the present invention, in order to achieve the above object, a nozzle for supplying a vaporized liquefied gas to a downstream side, a valve seat and a valve provided to be able to be seated from below the nozzle are provided. A body, a spring that urges the valve seat and the valve body in the nozzle direction, and a float that pushes up the valve seat and the valve body in the nozzle direction by buoyancy via a valve shaft extended from the valve body,
A magnetized body provided on the upper side of the float, and a permanent magnet opposed to the magnetized body and adsorbing the magnetized body at a position where the valve seat is seated on the nozzle. Means for setting the sum of the forces to be stronger than the gravitational force of the valve element and the valve seat is used. According to this means, when the liquid level of the liquefied gas in the evaporator is normal, the valve element and the valve seat are always separated from the nozzle against the elastic force of the spring, and the gas is supplied to the downstream side . The float serves to push up the valve body and the valve seat in accordance with the liquid level. When the float comes close to the seating position, the permanent magnet is securely closed in combination with the force for attracting the magnetized body. The valve closing state is maintained by the magnetic force of the permanent magnet, and the valve does not automatically return to the open state even if the liquid level drops again. The term “magnetized body” as used herein means a material to which a permanent magnet can be widely attracted.

Further, once the valve seat is seated on the nozzle, it cannot be easily detached, so a reset mechanism is provided. That is, a reset shaft for pushing down the valve body and the valve seat from the seating position with respect to the nozzle is provided, and the reset shaft is detached by pushing down the reset shaft with a force stronger than the sum of the elastic force of the spring and the attraction of the permanent magnet.

Further, a means is provided on the outer periphery of the float for preventing the float from being sucked up to the nozzle side by the flow rate of the gas, and the upper and lower sides of the protective cylinder are communicated with the container body of the evaporator. Used. By this means, the float can stably respond to the liquid level, and inadvertent seating of the valve seat on the nozzle can be avoided.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a preferred embodiment to which the configuration of the present invention is applied, in a state where gas is supplied to an apparatus such as an evaporator installed on the downstream side. Here, 1 is a container body of an evaporator, 2 is a container lid, 3 ...
Reference numeral 3 denotes a float that rises and falls according to the liquid level, and reference numeral 4 denotes a protection tube for the float, which has a structure for preventing the float 3 from being affected by the flow rate of the liquefied gas. In this embodiment, the float 3 is in a state in which three identical structures are vertically stacked, but the number and appearance of the floats are not limited to the embodiment. Reference numeral 5 denotes a liquefied gas nozzle, reference numeral 6 denotes a valve body, reference numeral 7 denotes a valve seat, and reference numeral 8 denotes a guard pipe for protecting the valve body 6 and the valve sheet 7 and regulating a flow path. When the liquid level is normal, the nozzle 5 and the valve sheet 7 are separated as shown in the figure, so that the gas flows as shown by the arrow A and flows out from the gas outlet 9.

Next, FIG. 2 shows a state in which the valve is closed due to an increase in the liquid level of the liquefied gas. As a structure other than that shown in FIG. The protection cylinder upper plate 11 is provided with permanent magnets 1 provided on the upper plate 10.
2 is a magnetized body located above the float, 13 is a magnetized body 1
A coupling shaft for integrating the floats 2 and the floats 3..., 14 is joined to the valve body 6 and the valve seat 7, and a valve shaft extended to the magnetized body 12; The spring is biased upward. In addition, a hole is provided in the protection cylinder upper plate 10, and the protection cylinder 4
The inside of the protective cylinder communicates with the container body 1 in combination with the hole provided in the lower plate, and the liquid level is matched. The elastic force of the spring 15 is set to be weaker than the total gravity of the valve body 6, the valve seat 7, and the valve shaft 14. Therefore, in the state of FIG. 1 in which the liquid level is normal, the gravity of the valve body 6 and the like overcomes the elastic force of the spring 15, so that the valve seat 7 is separated from the valve seat surface of the nozzle 5, and the liquefied gas is always on the downstream side. Supplied to

However, when the heat source becomes insufficient due to a power failure or when the consumption of the liquefied gas becomes abnormally high, the liquid level in the container body 1 rises. Then, the float 3 also rises due to the buoyancy, so that the magnetized body 12 is gradually pushed up. As a result, the sum of the elastic force of the spring 15 and the buoyancy of the float 3 increases the total gravity of the valve body 6, the valve seat 7 and the valve shaft 14. And the valve seat 7 moves in the direction of sitting on the nozzle 5. Also, the magnetized body 12 is a permanent magnet 1
When it approaches 1, the magnetizing force also acts greatly, and when it approaches a certain distance, the magnetized body 12 is attracted to the permanent magnet 11 and the valve is closed. Then, once the valve is closed, even if the liquid level drops again, the magnetized body 12 is kept adsorbed by the permanent magnet 11, so that the valve is not automatically opened.

FIG. 3 further shows a structure for resetting from the state shown in FIG. 2, wherein 16 is a high-pressure nipple screwed into the nozzle 5 and extended, 17 is a cheese pipe, and 18 is a high-pressure nip of the cheese pipe 17. A cap 19 provided in a straight path opposite to the nipple 16 penetrates the cap 18 and the valve body 6
Reference numeral 20 denotes a reset knob for pushing the reset shaft 19 toward the cap 18, and reference numeral 21 denotes a spring for urging the reset knob 20 to the side opposite to the pushing side. The figure shows a state where the reset is completed by pushing the reset knob 20. Here, when the liquid level rises to the state shown in FIG.
If no operation is performed, the state of FIG. 2 is maintained as described above. After that, adjustment of the downstream evaporator was completed,
If it is confirmed that a safe gas supply can be performed, first, the liquefied gas remaining in the container body 1 is discharged from the drain valve 22, and the reset knob 20 is pushed toward the cap 18, thereby opposing the elastic force of the spring 21. Then, the reset shaft 19 is pushed in, and the state where the permanent magnet 11 and the magnetized body 12 are attracted is released. As a result, both the valve element 6 and the valve seat 7 are separated from the nozzle 5 and return to the state of FIG. When the liquefied gas is supplied from the supply nozzle 23 into the container body 1, the reset is completed.

Next, the function of the protection cylinder 4 will be described again.
Since the gas flowing between the valve body 6 and the nozzle 5 has a considerably high flow velocity, the suction force by the gas flow acts on the valve body 6 so that the valve seat 7 keeps the nozzle 5 even when the liquid level does not rise so much. May sit. The protection cylinder 4 is configured to prevent such an effect. The presence of the protection cylinder 4 stabilizes the gas flow, and the gas flow acts once in a direction to push down the valve body 6, thereby enabling the seating described above. This cancels the directional force. Therefore, occurrence of unnecessary supply stop is suppressed. Further, after an appropriate flow path is secured by the protective cylinder 4, the gas flow path is also regulated by the guard pipe 8. That is, as shown in FIG.
By making the height of the upper end 8a of the guard pipe 8 higher than the height of the valve seat 7 when the valve is opened, the flow of gas indicated by the arrow descends along the upper end 8a of the guard pipe 8 and the valve body 6 After pressing down, the nozzle 5 is headed. Therefore, the valve body 6 and the valve seat 7 are restricted from being sucked up to the nozzle 5 side by the gas flow velocity.

[0013]

According to the present invention, when the liquid level of the liquefied gas in the container body rises, the valve body and the valve seat move in the seating direction with respect to the nozzle due to the buoyancy of the float, and are securely seated downstream. The gas supply to the side can be stopped, and at the same time, the permanent magnet is attracting the magnetized body,
Even when the liquid level drops again, the valve-closed state is maintained, so that careless opening of the valve as in the related art is no longer performed automatically.

[0014] In addition, with the configuration in which the reset is performed by the reset shaft, the valve once closed can be easily returned. When a protective cylinder is provided on the outer periphery of the float and a guard pipe is provided around the outer periphery of the valve element and the valve seat, the float can be prevented from being sucked upward by the flow velocity of the gas, thereby ensuring a reliable operation. It became possible to secure.

[Brief description of the drawings]

FIG. 1 is an end view showing one embodiment of the present invention;

FIG. 2 is an end view showing the valve closed state;

FIG. 3 is an end view showing a state restored by a reset.

FIG. 4 is an enlarged sectional view of the vicinity of the valve element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Container lid 3 ... 3 Float 4 Protective cylinder 5 Nozzle 6 Valve body 7 Valve sheet 8 Guard pipe 9 Gas outlet 10 Protective cylinder upper plate 11 Permanent magnet 12 Magnetized body 13 Coupling shaft 14 Valve shaft 15 Spring 16 High pressure nipple 17 Cheese tube 18 Cap 19 Reset shaft 20 Reset knob 21 Spring 22 Drain valve 23 Supply nozzle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F17C 1/00-13/12

Claims (4)

(57) [Claims] 1. A nozzle for supplying liquefied gas in a container body to a downstream side, a valve seat and a valve body provided so as to be able to be seated from below the nozzle, and the valve seat and the valve body in the nozzle direction. A biasing spring, a float that pushes up the valve seat and the valve body in the direction of the nozzle by buoyancy via a valve shaft extended from the valve body, a magnetized body provided above the float, and the magnetized body And a permanent magnet that attracts the magnetized body at a position where the valve seat is seated on the nozzle, and the sum of the elastic force of the spring and the attraction force is stronger than the gravity of the valve body and the valve seat. A liquefied gas outflow prevention valve characterized by being set. 2. A liquefied gas outflow prevention valve according to claim 1, further comprising a reset shaft for pushing down a valve body and a valve seat from a seating position with respect to a nozzle. 3. A protection cylinder for preventing the float from being sucked up to the nozzle side by a gas flow rate on the outer periphery of the float, and upper and lower sides of the protection cylinder communicate with the container body. 2. The liquefied gas outflow prevention valve according to 2. 4. A liquefied gas outflow prevention valve according to claim 1, wherein a guard pipe is provided around the outer periphery of the valve element and the valve seat, and the upper end of the guard pipe is higher than the height of the valve seat at the valve opening position. .