JP4540995B2 - Pressure reducing valve with safety device - Google Patents

Description

  The present invention relates to a pressure reducing valve for reducing a high pressure gas supplied from a gas cylinder or the like to a predetermined secondary pressure, and in particular, when the gas pressure exceeds an allowable value, the abnormal gas is released into the atmosphere to ensure safety. The present invention relates to a pressure reducing valve with a safety device.

  The high-pressure gas accumulated in a high-pressure gas cylinder or the like is usually used after being reduced to a predetermined secondary pressure by a pressure reducing valve. For such a pressure reducing valve, a pressure reducing valve with a safety mechanism is often used in order to prevent damage to gas equipment and ensure safety. Such a pressure reducing valve is generally provided with a safety mechanism section independently of the pressure reducing mechanism section, as shown in, for example, a pressure reducing valve used in a gas cylinder of a desktop beer server of Patent Document 1.

JP 2002-37394 JP

    However, such a conventional pressure reducing valve with a safety device not only increases the size of the whole pressure reducing valve, but also requires a pressure adjusting spring for pressure adjustment in the pressure reducing and safety mechanism sections, and the structure is complicated. There is a problem of becoming. For this reason, a compact pressure reducing valve is required especially for a home beer server that uses a refrigerator for home use. There is also a need for further cost reduction.

  In view of such a demand, the present invention is a pressure-reducing valve with a compact and inexpensive safety device, for example, a home beer server that can be conveniently used in a home refrigerator, such as a high-pressure gas utilization device that requires compactness. An object of the present invention is to provide a pressure reducing valve with a safety device.

A pressure reducing valve with a safety device according to the present invention includes a case having a connection port to a high-pressure gas supply source at one end and a gas supply port to a gas device at the other end, and is fixed to the case and extends in the longitudinal direction. A nozzle that movably attaches to the nozzle via an inner airtight seal, and slides between the inner loose fitting and the case between the inner loose fitting and the case. An outer airtight seal that supports the outer airtight seal and is movable relative to the inner loosely fitting body, and the outer loosely fitting body is connected to the gas supply port side of the case. A pressure regulating spring with a safety device, wherein the nozzle is connected to a high-pressure gas supply source and a gas outlet is provided at a tip portion, and the inner loose fitting is A nozzle stopper facing the gas outlet is provided, and the outward loose fitting And support portion is provided to push the inner loosely fitted body in the urging direction of the tooth pressure control spring, and wherein the case gas outlet communicating with the outside of the case in the sliding range of the outer hermetic seal provided It will be.

The pressure reducing valve with a safety device according to the present invention also has a case having a connection port to a high-pressure gas supply source at one end and a gas supply port to a gas device at the other end, and is fixed to the case in the longitudinal direction. An extended nozzle, an inner loosely fitted body movably attached to the nozzle via an inner airtight seal, and between the inner loosely fitted body and the case and between the case and the inner loosely fitted body An outer airtight seal that slides, an outer airtight body that supports the outer airtight seal and is movable relative to the inner airtight body, and the gas supply of the case to the outer airtight body. A pressure-reducing valve with a safety device comprising a pressure regulating spring biased toward the mouth side, wherein the nozzle is connected to a high-pressure gas supply source and a gas outlet is provided at a tip, and the inner loose fitting body Is provided with a nozzle stopper that faces the gas outlet. The loosely-fitted body is provided with a support portion that pushes the inner loosely-fitted body in the biasing direction of the pressure regulating spring, and the outer airtight side of the side wall of the inner loosely-fitted body that is in contact with the outer airtight seal A gas passage leading to the atmospheric pressure chamber may be provided within the movable range of the seal, and a gas passage passing through the atmospheric pressure chamber and the outside of the case may be provided in the case. In this case, the case may be configured such that the outer cylinder and the cap are screwed together, and a gas passage through the atmospheric pressure chamber and the outside of the case is provided in the screw coupling portion. it can.

In each of the above-described pressure reducing valves with a safety device, the nozzle stopper is preferably supported by the inner loosely fitting body so as to be movable up and down and left and right. The nozzle includes a cut nozzle on the high-pressure gas supply source side, a core nozzle on the gas ejection port side, a nozzle seal provided at a joint between the cut nozzle and the core nozzle, and a backup member that supports the nozzle seal. Thus, the backup member is preferably made of a material that is heat-softening or buckled by a predetermined stress.

  The pressure reducing valve according to the present invention has a compact and inexpensive structure, and is suitable for a pressure reducing valve with a safety device used for a home beer server that can be conveniently used in a home refrigerator, for example, and is compact. In addition, a gas supply port for supplying gas to the gas equipment can be provided at a required position, and it is possible to meet the demands in terms of use and design. Furthermore, there is an advantage that the material cost can be reduced.

  FIG. 1 shows a front sectional view of a pressure reducing valve according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. In the pressure reducing valve according to this example, the case 11 is composed of an outer cylinder 12 having one end closed and the other end opened, and a cap 22 screwed into the opening of the outer cylinder. One end of the case 11 is provided with a connection port 25 for connecting a high pressure gas supply source to the pressure reducing valve, and the other end is provided with a gas supply port 16 for supplying a decompressed gas to the gas device. Yes. In addition, the case 11 is provided with a gas discharge hole 17 as a gas discharge portion 18 for discharging abnormally high pressure gas into the atmosphere.

  A nozzle 50 extends in the longitudinal direction in the case 11, and an inner loose fitting body 30 is slidably attached to the nozzle 50. An outer loose fitting 40 is provided between the inner loose fitting 30 and the case 11, and the outer loose fitting 40 is biased toward the gas supply port 16 side of the case 11 by a pressure adjusting spring 65. Is provided.

The nozzle 50 is integrated with the case 11 by a flange 53 thereof being fastened to the end of the outer cylinder 12 on the opening side by the outer cylinder 12 and the cap 22. One end of the nozzle 50 becomes a sharp cut nozzle 52, and as described below, high-pressure gas can be led through the sealing plate 81 of the gas cylinder. The derived high-pressure gas is ejected from the gas ejection port 55 at the other end through the gas channel 54.

  The inner loose fitting body 30 includes a head 31 and a guide 38 screwed to the head 31, and the head 31 faces the tip of the nozzle 50, and the guide 38 extends along the axis of the nozzle 50. As shown in the enlarged sectional view of the inner loosely fitting body 30 in FIG. 3, a nozzle stopper mounting portion 32 including a head 31, an upper member 33, and a lower member 34 is provided at the center of the head 31. Yes.

The outer loose-fitting body 40 has a cylindrical shape that fits on the outer periphery of the guide 38 of the inner loose-fitting body 30, and a flange 41 is provided at the upper end thereof. The upper surface of the flange serves as a mounting surface for the outer airtight seal 61 and supports it. The lower surface is a contact surface of the pressure adjusting spring 65. Further, a support portion 42 for supporting the inner loose fitting body 30 from below is provided at the lower end portion of the outer loose fitting body 40, and supports the outer airtight seal, with respect to the inner loose fitting body. Relative movement is possible.

  As shown in FIG. 3, a nozzle stopper 45 is attached to the nozzle stopper attaching portion 32 of the inner loose fitting body 30. The nozzle stopper 45 has a flange 46 that can move up and down and left and right within the nozzle stopper mounting portion 32. Therefore, even if the axial direction of the inner loose fitting body 30 and the nozzle 50 is slightly shifted, It is possible to face 50 gas outlets 55. For this reason, the nozzle stopper 45 can be brought into contact with the gas outlet 55 evenly.

  The pressure adjusting spring 65 is provided between the upper surface of the flange 53 of the nozzle 50 and the lower surface of the flange 41 of the outer loose fitting body 40, and biases the outer loose fitting body 40 toward the gas supply port 16 side of the case 11. Yes.

  Further, as shown in FIG. 1, an inner airtight seal 60 is provided between the guide 38 and the nozzle 50, and an outer airtight seal 61 is provided between the guide 38 and the outer cylinder 12. Thereby, the space on the gas supply port 16 side of the case 11 surrounded by the outer cylinder 12, the outer airtight seal 61, the inner loose fitting body 30, the inner airtight seal 60, and the nozzle 50 is ensured to be airtight. In this space, a gas outlet 55 of the nozzle 50 is opened to form a secondary pressure chamber 100.

  On the other hand, the space surrounded by the outer cylinder 12, the outer airtight seal 61, the inner loose fitting body 30, the inner airtight seal 60, the nozzle 50 and the flange 53 is formed by the gas discharge hole 17 provided in the case 11 described above. 11 It communicates with the outside and serves as an atmospheric pressure chamber 110. The position of the gas discharge hole 17 is determined by the allowable pressure in the secondary pressure chamber.

As shown in FIG. 4, the present pressure reducing valve is used by connecting a gas cylinder 80 to the connection port 25 and guiding the gas supplied from the gas supply port 16 to a gas device. First, when the gas cylinder 80 is screwed into the connection port 25, the sealing plate 81 of the gas cylinder is perforated by the cut nozzle 52. A space surrounded by the gas cylinder 80, the cap 22 and the nozzle 50 in a state where the gas cylinder 80 is completely screwed in is hermetically sealed by a cylinder seal 62. The next pressure chamber 100 is ejected.

The gas pressure is adjusted by the pressure reducing valve as follows. Before connecting the gas cylinder 80 to the pressure reducing valve, as shown in FIG. 1, the nozzle stopper 45 is lifted from the gas outlet 55 by the pressure adjusting spring 65 via the outer loose fitting 40 and the inner loose fitting 30. It is in the state. When the gas cylinder 80 is connected, high-pressure gas is ejected from the gas ejection port 55, the gas is filled in the secondary pressure chamber 100, and the gas pressure in the secondary pressure chamber 100 is increased. When the gas pressure in the secondary pressure chamber 100 rises to a predetermined pressure, the outer loosely fitting body 40 and the inner loosely fitting body 30 that are in contact with the outer hermetic seal 61 and the inner hermetic seal 30 are pressure-regulating springs. Start moving down against 65. At this time, as shown in FIG. 4, the nozzle stopper 45 is sandwiched between the upper member 33 of the inner loosely fitting body 30 and the gas outlet 55 of the nozzle 50, and the nozzle stopper closes the gas outlet 55. Supply stops. When the gas is consumed in this state and the gas pressure in the secondary pressure chamber 100 decreases, the nozzle stopper 45 is detached from the gas outlet 55 and the high pressure gas is supplied to the secondary pressure chamber 100 again. In normal times, the above operation is repeated and a gas having a predetermined pressure is supplied.

However, if the nozzle stopper 45 is damaged for some reason, for example, the pressure in the secondary pressure chamber 100 may rise abnormally. In such a case, as described above, first, the nozzle stopper 45 is sandwiched between the upper member 33 of the inner loose fitting 30 and the gas outlet 55 of the nozzle 50, and the inner loose fitting 30 is fixed to the nozzle. Therefore, it can no longer move downward. Therefore , the outer loose fitting body 40 is pushed by the outer airtight seal 61 and moves downward along the guide 38 of the inner loose fitting body 30. When the outer airtight seal 61 moves downward by a predetermined amount against the pressure adjusting spring 65 together with the outer loose fitting body 40 , the outer airtight seal 61 reaches the discharge hole 17, and the gas in the secondary pressure chamber 100 is discharged. Released into the atmosphere. When the gas is released and the gas pressure in the secondary pressure chamber decreases, the outer loosely fitted body 40 is urged by the pressure regulating spring 65 and rises. By the above operation, the gas pressure in the secondary pressure chamber 100 is maintained within an allowable value, and safety is ensured.

This pressure reducing valve by the above-described configuration, the pressure regulating spring 65 becomes Rukoto enough only one, the overall size of the pressure reducing valve can be made compact. Further, since the inner loose fitting body 30 and the outer loose fitting body 40 do not receive a high primary pressure, it can be easily made of a resin having a relatively low strength and can constitute an inexpensive pressure reducing valve. it can.

  Although the present invention has been described above, the inner loosely fitted body 30 is preferably provided with a support portion 37 on the head 31 as shown in FIG. Thereby, the inclination of the inner loosely fitting body 30 in the outer cylinder 12 can be prevented and the sliding thereof can be made smooth. The support portion 37 may be provided on the guide 38. As shown in FIG. 5, the nozzle stopper 45 can be integrated with the inner loosely fitting body 30 by screw connection to the head 31. The case 11 may be composed of an outer cylinder 12 and a cap 22 screwed into the opening of the outer cylinder as shown in FIG. 6, and the nozzle 50 may be screwed into the cap 22 and fixed to the case 11. Good. The connection between the pressure reducing valve and the gas cylinder 80 may be performed by using the cylinder case 85 and screwing the cylinder case 85 containing the gas cylinder 80 with the pressure reducing valve.

  Moreover, this pressure-reduction valve can be used other than the gas cylinder used for a beer server, and can also be used by connecting to high pressure gas supply means other than a gas cylinder. When used by connecting to a high-pressure gas supply means other than the gas cylinder, the structure of the connection port 25 of the case 11 and the cut nozzle 52 is configured so as to suit the means.

  Further, as shown in FIG. 7, the support portion 42 of the outer loose fitting 40 that presses the inner loose fitting 30 includes a protrusion 43 provided on the outer loose fitting 40 and a groove into which this slides. 39 may be provided on the inner loose fitting body 30.

  The nozzle 50 may be integrally formed as shown in FIG. 1, but may be divided into a cut nozzle 52 and a core nozzle 51 as shown in FIG. In this case, a filter 70 for supplying clean gas can be easily provided in the gas flow path 54. Further, the backup member 75 of the nozzle seal 63 provided between the core nozzle 51 and the cut nozzle 52 may be made of, for example, a so-called thermosoftening material that suddenly softens when a predetermined temperature is exceeded or a material that buckles with a predetermined stress. Thus, a safety device that prevents an abnormal increase in gas cylinder pressure can be easily and inexpensively configured.

  The gas supply port 16 can also be provided in a direction perpendicular to the axis of the case 11 as shown in FIG. The gas supply port 16 may be provided at a convenient position for communicating with the secondary pressure chamber 100 and guiding the gas to the gas device. As shown in FIG. 1, when the gas supply port 16 is provided in the axial direction of the case 11, there is an advantage that the entire pressure reducing valve including the piping to the gas equipment can be compactly integrated.

In the example shown in FIG. 1, the gas discharge hole 17 is provided in the side wall portion of the outer cylinder 12 and communicates the atmospheric pressure chamber 110 to the outside of the outer cylinder 12, but the gas pressure in the secondary pressure chamber 100 is abnormal. Other means may be used as long as it has a function of releasing gas into the atmosphere when it rises. FIG. 10 shows a partial cross-sectional view of a pressure reducing valve having a mechanism for guiding the gas pressure in the secondary pressure chamber 100 to the atmospheric pressure chamber 110 and releasing it to the outside of the outer cylinder 12 as an example of such a case. . In this example, the gas passage 170 that communicates with the atmospheric pressure chamber 110 in the guide 38 of the inner loosely fitting body 30 on which the outer airtight seal 61 slides is positioned within the movable range of the outer airtight seal 61. Is provided. Further, the gas discharge portion 18 is constituted by a gas discharge hole 170 provided in the guide 38 of the inner loose fitting body 30, and a groove 171 and a groove 172 provided in the end portion and the screw portion of the outer cylinder 12, respectively. In this case, the groove 172 can be omitted if the gas can be sufficiently discharged from the gap formed in the screw coupling portion between the outer cylinder 12 and the cap 22.

It is front sectional drawing of the pressure-reduction valve with a safety device which concerns on this invention. It is AA sectional drawing of FIG. It is an expanded sectional view of an inner loose fitting part. It is front sectional drawing which shows the state which connected the gas cylinder to the pressure-reduction valve with a safety device of FIG. It is a fragmentary sectional view of other examples of a nozzle stopper attachment part. It is a fragmentary sectional view of other examples of a cap part containing a nozzle. It is a perspective view of the other Example of the support part of the outward loosely fitting body which pushes an inward loosely fitting body in the urging | biasing direction of a pressure regulation spring. It is a fragmentary sectional view of other examples of a nozzle part. It is a fragmentary sectional view of other examples of a gas supply mouth part. It is a fragmentary sectional view of other examples of a gas exhaust hole part.

Explanation of symbols

11 cases
12 outer cylinder
16 Gas supply port
17 Gas exhaust hole
18 Gas exhaust section
22 cap
25 connection port
30 Inner loose fit
31 heads
32 Nozzle stopper mounting
33 Upper member
34 Lower member
37 Support section
38 Guide
39 groove
40 Outside loose fit
41 Flange
42 Bearing
43 ridges
45 Nozzle stopper
46 Flange
50 nozzles
51 core nozzle
52 Cut nozzle
53 Flange
54 Gas flow path
55 Gas outlet
60 Inner airtight seal
61 Outer airtight seal
62 cylinder seal
63 Nozzle seal
65 Pressure spring
70 Filter
75 Backup material
80 Gas cylinder
81 sealing plate
85 cylinder case
100 Secondary pressure chamber
110 Atmospheric pressure chamber
170 Gas exhaust hole
171, 172

Claims (5)

A case having a connection port to a high-pressure gas supply source at one end and a gas supply port to a gas device at the other end, a nozzle fixed to the case and extending in the longitudinal direction thereof, and an inner airtight seal to the nozzle An inner loosely fitted body that is movably attached via the inner loosely fitted body, an outer airtight seal that is between the inner loosely fitted body and the case and slides between the case and the inner loosely fitted body, and the outer airtightly sealed body. An outer loosely fitted body that supports a seal and is movable relative to the inner loosely fitted body, and a pressure adjusting spring that biases the outer loosely fitted body toward the gas supply port side of the case. For pressure reducing valve with safety device,
The nozzle is connected to a high pressure gas supply source and provided with a gas outlet at the tip.
The inner loose fit body is provided with a nozzle stopper that faces the gas ejection port,
The outer loosely fitting body is provided with a support portion that pushes the inner loosely fitting body in the biasing direction of the pressure adjusting spring, and
The pressure reducing valve with a safety device, wherein the case is provided with a gas discharge portion communicating with the outside of the case within a sliding range of the outer airtight seal . A case having a connection port to a high-pressure gas supply source at one end and a gas supply port to a gas device at the other end, a nozzle fixed to the case and extending in the longitudinal direction thereof, and an inner airtight seal to the nozzle An inner loosely fitted body that is movably attached via the inner loosely fitted body, an outer airtight seal that is between the inner loosely fitted body and the case and slides between the case and the inner loosely fitted body, and the outer airtightly sealed body. An outer loosely fitted body that supports a seal and is movable relative to the inner loosely fitted body, and a pressure adjusting spring that biases the outer loosely fitted body toward the gas supply port side of the case. For pressure reducing valve with safety device,
The nozzle is connected to a high pressure gas supply source and provided with a gas outlet at the tip.
The inner loose fit body is provided with a nozzle stopper that faces the gas ejection port,
The outer loosely fitting body is provided with a support portion that pushes the inner loosely fitting body in the biasing direction of the pressure adjusting spring, and
A gas passage leading to the atmospheric pressure chamber is provided in a movable range of the outer airtight seal in the side wall of the inner loosely fitting body that is in contact with the outer airtight seal, and the atmospheric pressure chamber and the outside of the case are passed through the case. A pressure reducing valve with a safety device, comprising a gas passage.   3. The safety according to claim 2, wherein the case is configured such that an outer cylinder and a cap are screwed together, and a gas passage through the atmospheric pressure chamber and the outside of the case is provided in the screw coupling portion. Pressure reducing valve with device.   The pressure-reducing valve with a safety device according to any one of claims 1 to 3, wherein the nozzle stopper is supported by the inner loosely fitting body so as to be movable up and down and left and right. The nozzle includes a cut nozzle on the high-pressure gas supply source side, a core nozzle on the gas ejection port side, a nozzle seal provided at a joint between the cut nozzle and the core nozzle, and a backup member that supports the nozzle seal,
The pressure-reducing valve with a safety device according to any one of claims 1 to 4, wherein the backup member is made of a material that is thermally softened or buckled by a predetermined stress.

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