Gas conveying pipeline assembly of glass kiln burning gun

Abstract

The utility model discloses a gas conveying pipeline assembly of a glass kiln burning gun, which comprises a first conveying pipeline used for conveying natural gas to the burning gun; the first conveying pipeline is divided into a first pressure stabilizing section used for balancing and adjusting gas pressure and a first detection section used for detecting the gas conveying condition. The first conveying pipeline can communicate with the space outside the furnace through the pressure relief channel; the pressure relief channel is connected between the first pressure stabilizing section and the first detection section and / or in the direction of one end, far away from the first pressure stabilizing section, of the first detection section; the pressure relief channel can discharge gas in the first conveying pipeline to the space outside the furnace so as to assist the first pressure stabilizing section in releasing the pressure in the first pressure stabilizing section. Natural gas in part of pipe sections of the first conveying pipeline passing through the pressure adjusting devices and the detecting devices is rapidly discharged to the space outside the furnace, the effects of the pressure adjusting devices and the detecting devices are protected by rapidly reducing the air pressure in the first conveying pipeline, and the safety degree of the pipeline is improved; and an emergency means can be provided under the condition that an accident is about to occur.

Description

Technical Field

[0001] The present application discloses the technical field of kiln burners, and in particular, to a gas pipeline assembly for a glass kiln burner. Background Art

[0002] During the operation of the glass kiln, the stability and safety of the gas control system used to adjust the burner power are particularly important, which is directly related to the safe use of the kiln and the continuous supply of the furnace combustion medium, and will also affect the melting quality of the raw materials.

[0003] The gas transmission pipeline in the prior art is generally composed of two pipelines for transporting natural gas and oxygen. Since the pressure value inside the pipeline needs to be controlled, it is necessary to install pressure-stabilizing valves, pressure gauges, stop valves and other devices that can be scientifically regulated and detected on the pipeline to ensure stability and safety during the transportation process.

[0004] However, the existing gas pipeline structure does not have the function of handling emergencies. For example, when an accident is predicted to occur, the natural gas pipeline cannot be rapidly depressurized, and the accident cannot be avoided or reduced in severity. The continuous damage to the pressure regulating and detecting devices caused by high-pressure gas that exceeds the device's tolerance cannot be quickly resolved. Utility Model Content

[0005] The present application discloses a gas pipeline assembly for a glass kiln burner to solve a technical problem of providing one or two pressure relief channels on a first transmission pipeline for transmitting natural gas so that the channels can be opened when the gas pressure needs to be urgently reduced, thereby achieving the effect of the natural gas transmission pipeline being able to quickly reduce the internal gas pressure, so that when the control device and the detection device are damaged due to excessive gas pressure, the damage can be stopped in time.

[0006] In order to solve the above technical problems, the embodiment disclosed in the present application provides a gas pipeline assembly for a burner of a glass kiln, which mainly includes: a first delivery pipeline, which is used to transport natural gas to the burner; the first delivery pipeline is divided into a first pressure stabilizing section for balancing and adjusting the gas pressure and a first detection section for detecting the gas delivery situation; and a pressure relief channel, which can connect the first delivery pipeline with the space outside the furnace; the pressure relief channel is connected between the first pressure stabilizing section and the first detection section and / or the first detection section is away from the first pressure stabilizing section.

[0007] The pressure relief channel can discharge the gas in the first delivery pipeline to the space outside the furnace to assist the first pressure stabilizing section in releasing the pressure inside it.

[0008] In some embodiments, the invention further comprises: a second delivery pipeline for delivering oxygen to the burner; the second delivery pipeline is divided into a second pressure stabilizing section for balancing and regulating the pressure of the gas and a second detection section for detecting the gas delivery condition;

[0009] The first voltage stabilizing section and the second voltage stabilizing section are both provided with pressure control mechanisms, and the first detection section and the second detection section are both provided with pressure detection mechanisms.

[0010] In some embodiments, the pressure control mechanism includes a pressure stabilizing valve, a filter, two pressure gauges, and a first stop valve provided on the two pressure gauges, which are sequentially arranged on the first pressure stabilizing section or the second pressure stabilizing section.

[0011] In some embodiments, a second stop valve for backup is provided between the two pressure gauges.

[0012] In some embodiments, an end of the first pressure stabilizing section close to the pressure stabilizing valve is set as an air inlet end for connecting to an air source; the pressure relief channel is connected to the side of the two pressure gauges on the first pressure stabilizing section away from the air inlet end.

[0013] In some embodiments, the pressure detection mechanism includes a temperature sensor, a pressure sensor, an electromagnetic opening and closing valve, and a flow regulating component which are sequentially arranged on the first detection section or the second detection section.

[0014] In some embodiments, one end of the first detection section close to the temperature sensor is connected to the first pressure stabilizing section; and the pressure relief channel is connected to a side of the flow regulating component away from the first pressure stabilizing section.

[0015] In some embodiments, the flow regulating component is composed of a flow meter and a flow control valve, which is used to detect and adjust the flow ratio of the gas.

[0016] In some embodiments, a lower pressure limit detection component is further provided between the pressure sensor and the electromagnetic opening and closing valve, and the lower pressure limit detection component is communicatively connected with the electromagnetic opening and closing valve so as to be able to send a closing command signal to the electromagnetic opening and closing valve.

[0017] In some embodiments, a relief valve for controlling the opening and closing of the pressure relief channel is configured on the pressure relief channel. The relief valve is communicatively connected to the pressure gauge on the first pressure stabilizing section and / or the pressure sensor on the first detection section, so that the relief valve controls the opening and closing state by detecting the gas pressure value in the first delivery pipeline.

[0018] Through the above technical scheme, the gas pipeline assembly of the glass kiln burner gun disclosed in the present application is achieved by connecting a pressure relief channel that can communicate with the space outside the furnace to the first transmission pipeline for transmitting natural gas. Specifically, the pressure relief channel is connected to the side of each pressure regulating device and each detection device away from the gas source, so as to quickly discharge the natural gas in the partial pipe section of the first transmission pipeline passing through each pressure regulating device and each detection device to the safe space outside the furnace, thereby achieving the effect of protecting the pressure regulating device and the detection device by quickly reducing the air pressure in the first transmission pipeline, effectively improving the stability and safety of the gas pipeline assembly of the glass kiln burner gun, and being able to provide emergency measures in the event of an impending accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments disclosed in the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments disclosed in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of the gas pipeline assembly of the glass kiln burner disclosed in the embodiment disclosed in the present application.

[0021] Description of reference numerals:

[0022] 11. first delivery pipeline; 11a. first pressure stabilization section; 11b. first detection section;

[0023] 12. second delivery pipeline; 12a. second pressure stabilization section; 12b. second detection section;

[0024] 13. Pressure relief channel; 131. Release valve;

[0025] 101, pressure regulating valve; 102, filter; 103, pressure gauge; 104a, first stop valve; 104b, second stop valve; 105, temperature sensor; 106, pressure sensor; 107, electromagnetic opening and closing valve; 108a, flow meter; 108b, flow control valve; 109, lower pressure limit detection element;

[0026] 20. Burn the gun. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the embodiments disclosed in the present application in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles disclosed in the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0028] The present application discloses and provides these embodiments in order to make the present application disclosed thoroughly and completely, and to fully express the scope disclosed in the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0029] It should be noted that, in the description disclosed in this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the disclosure of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the disclosure of this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] In addition, the words "first", "second" and similar words used in the disclosure of this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0031] It should also be noted that in the description disclosed in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the disclosure of this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0032] All terms used in this application disclosure have the same meanings as those understood by those of ordinary skill in the art to which this application disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as those in general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] At present, from the perspective of market development, the development of electronic equipment and automobile fields is becoming more and more extensive, and the demand for the quality and output of glass products is also increasing. Glass is generally made by melting raw materials in a glass kiln and then going through various processes. Among them, the burner is one of the most important parts for melting glass or raw materials.

[0035] The inventors of the present application discovered that the pipeline for supplying the combustion medium to the burner is generally equipped with devices such as a pressure-stabilizing valve, a pressure gauge and a stop valve in order to make the combustion medium supplied to the burner more stable and safe. However, the design of the existing delivery pipeline cannot provide emergency measures or emergency responses for emergency situations, thereby avoiding major accidents. When the gas pressure in the pipeline exceeds the bearing range of each valve component, it is easy for the pipeline to lose control due to damage to the device. When the pipeline gas leaks irregularly, it is easy to cause operational accidents.

[0036] The disclosed embodiment of the present application provides a gas pipeline assembly for a glass kiln burner, which mainly includes: a first delivery pipeline 11, which is used to transport natural gas to the burner 20; the first delivery pipeline 11 is divided into a first pressure stabilizing section 11a for balancing and adjusting the gas pressure and a first detection section 11b for detecting the gas delivery situation; and a pressure relief channel 13, which can connect the first delivery pipeline 11 with the space outside the furnace; the pressure relief channel 13 is connected between the first pressure stabilizing section 11a and the first detection section 11b and / or the first detection section 11b away from the first pressure stabilizing section 11a.

[0037] The pressure relief channel 13 can discharge the gas in the first delivery pipeline 11 to the space outside the furnace to assist the first pressure stabilizing section 11a in releasing the pressure inside it.

[0038] In some embodiments, it further comprises: a second delivery pipeline 12 for delivering oxygen to the burner; the second delivery pipeline 12 is divided into a second pressure stabilizing section 12a for balancing and regulating the pressure of the gas and a second detection section 12b for detecting the gas delivery condition;

[0039] The first voltage stabilizing section 11a and the second voltage stabilizing section 12a are both provided with a pressure control mechanism, and the first detection section 11b and the second detection section 12b are both provided with a pressure detection mechanism.

[0040] In the preferred embodiment of the present application, if the gas pipeline assembly of the glass furnace burner adopts mixed gas as the combustion medium, it is at least composed of two pipelines for conveying natural gas and oxygen respectively. In the embodiment, for the convenience of reference, the pipeline for conveying natural gas is defined as the first conveying pipeline 11, and the pipeline for conveying oxygen is defined as the second conveying pipeline 12; when the functional understanding is adopted, the first conveying pipeline 11 and the second conveying pipeline 12 can be divided into two functional sections respectively, wherein the first conveying pipeline 11 is divided into the first pressure stabilizing section 11a and the first detection section 11b, and the second conveying pipeline 12 is divided into the second pressure stabilizing section 12a and the second detection section 12b; the two pressure stabilizing sections convey the pressure-balanced gas to the corresponding detection section through devices such as pressure regulation and pressure detection, and the two detection sections monitor the gas delivery situation and adjust the gas mixing ratio in the burner 20 in real time through devices such as sensors, flow detection and flow regulation. The technical point of the present application is that a pressure relief channel that can be connected to the safe space outside the furnace is connected to the first conveying pipeline 11, so as to quickly reduce the pressure when an emergency occurs or the pressure exceeds the carrying range of the regulating device.

[0041] As a second embodiment of the first transmission pipeline 11: the pressure relief channel 13 can be connected between the first pressure stabilizing section 11a and the first detection section 11b. Since the natural gas in the present application needs to pass through the first pressure stabilizing section 11a before entering the first detection section 11b, the pressure relief channel 13 can discharge the gas in the first pressure stabilizing section 11a in a targeted manner, and can give priority to protecting the devices on the first pressure stabilizing section 11a.

[0042] As a second embodiment of the first transmission pipeline 11: the pressure relief channel 13 can be connected to the side of the first detection section 11b away from the first pressure stabilizing section 11a. Since the natural gas in the present application needs to pass through the first pressure stabilizing section 11a before entering the first detection section 11b, the pressure relief channel 13 can discharge the gas in the first detection section 11b in a targeted manner, and can give priority to protecting the devices on the first detection section.

[0043] As a third embodiment of the first delivery pipeline 11: two pressure relief channels 13 can be connected to the first delivery pipeline 11. The third embodiment is a combination of the first embodiment and the second embodiment, so its structural features will not be described in detail. After using two pressure relief channels 13, the corresponding pressure relief channels 13 can be opened for the device position to be protected to avoid wasting too much natural gas. When an emergency is found, the two pressure relief channels 13 are opened at the same time to discharge the natural gas in the first delivery channel 11, which can also solve the problem caused by gas pressure more quickly.

[0044] In some embodiments, the pressure control mechanism includes a pressure stabilizing valve 101 , a filter 102 , two pressure gauges 103 , and a first stop valve 104 a disposed on the two pressure gauges 103 , which are sequentially arranged on the first pressure stabilizing section 11 a or the second pressure stabilizing section 12 a .

[0045] By adopting the above structure, a pressure-stabilizing valve 101 for reducing the gas pressure, a filter 102 capable of filtering impurities to prevent pipeline blockage, and two pressure gauges 103 for detecting the gas pressure can be arranged on the first pressure-stabilizing section 11a and the second pressure-stabilizing section 12a. In order to prevent gas exceeding the pressure range from passing through the first pressure-stabilizing section 11a or the second pressure-stabilizing section 12a, a first stop valve 104a for sealing the first pressure-stabilizing section 11a or the second pressure-stabilizing section 12a is also arranged between the two pressure gauges 103, so as to block the gas from entering the first detection section 11b or the second detection section 12b before the gas pressure is adjusted.

[0046] In some embodiments, a second stop valve 104 b is provided between the two pressure gauges 103 for backup.

[0047] By adopting the above structure, when the first stop valve 104a is damaged, the second stop valve 104b can replace the first stop valve 104a to block the first pressure stabilizing section 11a or the second pressure stabilizing section 12a.

[0048] In some embodiments, an end of the first pressure stabilizing section 11a close to the pressure stabilizing valve 101 is set as an air inlet end for connecting to an air source; the pressure relief channel 13 is connected to the side of the two pressure gauges 103 on the first pressure stabilizing section 11a away from the air inlet end.

[0049] By adopting the above structure, the natural gas in the first pressure stabilizing section 11a can be preferentially discharged through the pressure relief channel 13 to release its pressure, thereby preferentially protecting the pressure stabilizing valve 101, the filter 102, the pressure gauge 103 and the stop valve and other devices on the first pressure stabilizing section 11a to reduce the damage to the devices caused by the gas pressure, saving costs while also improving the safety of the gas transportation process.

[0050] In some embodiments, the pressure detection mechanism includes a temperature sensor 105, a pressure sensor 106, an electromagnetic on-off valve 107, and a flow regulating component which are sequentially arranged on the first detection section 11b or the second detection section 12b.

[0051] By adopting the above structure, a temperature sensor 105, a pressure sensor 106, an electromagnetic opening and closing valve 107 and a flow regulating component can be configured on the first detection section 11b or the second detection section 12b; and when receiving the gas after the pressure regulation is completed, the temperature, pressure and flow can be detected and adjusted again to ensure that the pressure and flow of the gas delivered to the burner 20 are accurate enough to improve the stability of the kiln burner control power.

[0052] It should be noted that the above-mentioned devices configured on the first delivery pipeline 11 and the second delivery pipeline 12 can be connected to a distributed control system (DCS) so as to be able to perform favorable intelligent adjustments according to factors such as pressure, ratio or temperature actually required. Since the distributed control system (DCS) belongs to the prior art and is not the core improvement point of this application, and the distributed control system (DCS) is not used as a partial improvement in this application, please understand that the distributed control system will not be described in detail.

[0053] In some embodiments, one end of the first detection section 11b close to the temperature sensor is connected to the first pressure stabilizing section 11a; and the pressure relief channel 13 is connected to a side of the flow regulating component away from the first pressure stabilizing section 11a.

[0054] By adopting the above structure, the natural gas in the first detection section 11b can be preferentially discharged through the pressure relief channel 13 to release its pressure, so that the temperature sensor 105, the pressure sensor 106, the electromagnetic opening and closing valve 107 and the flow regulating component on the first detection section 11b can be preferentially protected to reduce the damage to the components caused by the gas pressure, thereby saving costs and improving the safety of the gas transportation process.

[0055] In some embodiments, the flow regulating component is composed of a flow meter 108a and a flow control valve 108b, which are used to detect and adjust the flow ratio of the gas.

[0056] With the above structure, the flow information of the gas in the corresponding first detection section 11b or the second detection section 12b can be detected by the flow meter 108a, and the flow control valve 108b adjusts the ratio of the mixed gas delivered to the burner according to the flow information.

[0057] In some embodiments, a lower pressure limit detector 109 is further provided between the pressure sensor 106 and the electromagnetic opening and closing valve 107 . The lower pressure limit detector 109 is communicatively connected with the electromagnetic opening and closing valve 107 so as to be able to send a closing command signal to the electromagnetic opening and closing valve 107 .

[0058] With the above structure, after detecting that each device on the first delivery pipeline 11 or the second delivery pipeline 12 is powered on, the electromagnetic opening and closing valve 107 opens the corresponding first detection section 11b or the second detection section 12b, and the lower pressure limit detection element 109 is a pressure gauge for detecting the minimum gas pressure value. When it is detected that the first detection section 11b and the second detection section 12b have reached the minimum gas pressure value, the information is transmitted to the distributed control system, and the distributed control system issues an alarm to prompt the operator to perform maintenance, and at the same time closes the electromagnetic opening and closing valve 107 to avoid backfire caused by insufficient gas pressure.

[0059] In some embodiments, the pressure relief channel 13 is provided with a relief valve 131 for controlling the opening and closing of the channel. The relief valve 131 is communicatively connected with the pressure gauge 103 on the first pressure stabilizing section 11a and / or the pressure sensor 106 on the first detection section 11b, so that the relief valve 131 controls the opening and closing state by detecting the gas pressure value in the first delivery pipeline 11.

[0060] By adopting the above structure, the gas pressure in the first delivery pipeline 11 can be detected by the pressure gauge 103 on the first pressure stabilizing section 11a and / or the pressure sensor 106 on the first detection section 11b, and the pressure numerical information can be transmitted to the distributed control system. The distributed control system controls the opening and closing state of the relief valve 131 through the pressure numerical information, so that the gas pipeline assembly of the glass kiln burner provided in the present application can autonomously discharge some risks to prevent major accidents.

[0061] So far, the various embodiments disclosed in the present application have been described in detail. In order to avoid obscuring the concept disclosed in the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0062] Although some specific embodiments disclosed in the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration, and are not intended to limit the scope disclosed in the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit disclosed in the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A gas pipeline assembly for a glass furnace burner, characterized in that: include: A first delivery pipeline (11) for transporting natural gas to the burner (20); The first delivery pipeline (11) is divided into a first pressure stabilizing section (11a) for evenly regulating gas pressure and a first detection section (11b) for detecting gas delivery conditions; and A pressure relief channel (13) capable of connecting the first delivery pipeline (11) with a space outside the furnace; The pressure relief channel (13) is connected between the first pressure stabilizing section (11a) and the first detection section (11b) and / or in a direction of an end of the first detection section (11b) away from the first pressure stabilizing section (11a); The pressure relief channel (13) is capable of discharging the gas in the first delivery pipeline (11) to the space outside the furnace, so as to assist the first pressure stabilizing section (11a) in releasing the pressure inside it.

2. The gas pipeline assembly for the glass furnace burner according to claim 1 is characterized in that: Also includes: A second delivery pipeline (12) for delivering oxygen to the burner; The second delivery pipeline (12) is divided into a second pressure stabilizing section (12a) for balancing and regulating the pressure of the gas and a second detection section (12b) for detecting the gas delivery condition; The first voltage stabilizing section (11a) and the second voltage stabilizing section (12a) are both provided with a pressure control mechanism, and the first detection section (11b) and the second detection section (12b) are both provided with a pressure detection mechanism.

3. The gas pipeline assembly for the glass furnace burner according to claim 2 is characterized in that: The pressure control mechanism comprises a pressure stabilizing valve (101), a filter (102), two pressure gauges (103), and a first stop valve (104a) arranged in sequence on the first pressure stabilizing section (11a) or the second pressure stabilizing section (12a).

4. The gas pipeline assembly for the glass furnace burner according to claim 3 is characterized in that: A second stop valve (104b) for backup is also provided between the two pressure gauges (103).

5. The gas pipeline assembly for the glass furnace burner according to claim 3 or 4, characterized in that: An end of the first pressure stabilizing section (11a) close to the pressure stabilizing valve (101) is arranged as an air inlet end for connecting to an air source; the pressure relief channel (13) is connected to a side of the two pressure gauges (103) on the first pressure stabilizing section (11a) away from the air inlet end.

6. The gas pipeline assembly for the glass furnace burner according to claim 2, characterized in that: The pressure detection mechanism comprises a temperature sensor (105), a pressure sensor (106), an electromagnetic opening and closing valve (107) and a flow regulating component which are sequentially arranged on the first detection section (11b) or the second detection section (12b).

7. The gas pipeline assembly for the glass furnace burner according to claim 6, characterized in that: One end of the first detection section (11b) close to the temperature sensor is connected to the first pressure stabilizing section (11a); and the pressure relief channel (13) is connected to a side of the flow regulating component away from the first pressure stabilizing section (11a).

8. The gas pipeline assembly for the glass furnace burner according to claim 6, characterized in that: The flow regulating component is composed of a flow meter (108a) and a flow control valve (108b), and is used to detect and adjust the flow ratio of the gas.

9. The gas pipeline assembly for the glass furnace burner according to claim 6, characterized in that: A lower pressure limit detection component (109) is also provided between the pressure sensor (106) and the electromagnetic opening and closing valve (107). The lower pressure limit detection component (109) is communicatively connected with the electromagnetic opening and closing valve (107) so as to be able to send a closing instruction signal to the electromagnetic opening and closing valve (107).

10. The gas pipeline assembly for the glass furnace burner according to claim 1, characterized in that: The pressure relief channel (13) is provided with a relief valve (131) for controlling the opening and closing of the channel. The relief valve (131) is communicatively connected with the pressure gauge (103) on the first pressure stabilizing section (11a) and / or the pressure sensor (106) on the first detection section (11b), so that the relief valve (131) controls the opening and closing state by detecting the gas pressure value in the first delivery pipeline (11).

Images