JP6541371B2 - Gas supply device - Google Patents

Description

  The present invention relates to a gas supply device.

  Gas supply systems used in the field requiring gas may have multiple cylinders connected in order to secure a sufficient amount of gas. A pressure reducer is disposed at the connection from each cylinder, and the pressure of each cylinder is used after it has once been reduced to some pressure. In addition, especially in the medical field, there is a possibility that a serious situation may occur if the supply of gas is interrupted. Therefore, in the portion where the gas from each cylinder merges, by adopting a form of merging via a check valve. , The flow from the source with the highest pressure is automatically selected and consumed. Therefore, even if the pressure of one cylinder drops and it can not withstand use, it is possible to automatically supply gas continuously from the other cylinders.

  However, there are cases where it is desirable to preferentially consume the gas contained in any one of a plurality of cylinders. For example, in general, when one of the cylinders has just been replaced, it is desirable to preferentially consume the gas of another cylinder over the cylinder immediately after the replacement.

  In such a case, if the gas from the desired cylinder has the highest pressure by changing the set value of the pressure reducer provided corresponding to each cylinder, the gas from the cylinder is It can be made to be consumed preferentially.

  An example of such a switch is "Medical Gas Security Management Engineer Continued Workshop Text" (issued in 2012 Revised, editor / issuer Medical Device Center Foundation) pages 166 to 169 (non-patent document 1) Have been described.

"Medical Gas Security Management Engineer Continuing Course Text" (issued in 2012 Revised, editor / issuer Medical Device Center) pages 166 to 169

  Generally, to change the set value of the pressure reducer, a strong force is required, and to change the magnitude relation of the pressure of the gas from the plurality of cylinders, the set value of the plurality of pressure reducers must be changed In addition, it was burdensome for the user. Non-Patent Document 1 describes a device capable of collectively switching the set values of a plurality of pressure reducers and reversing the magnitude relationship of pressure by rotating one handle. However, since the rotation of the steering wheel is linked to the adjustment of the set value of the pressure reducing device, such operation of the steering wheel itself requires a strong force, which is a burden to the user.

  Therefore, an object of the present invention is to provide a gas supply device capable of easily selecting which cylinder of the plurality of cylinders should preferentially consume gas.

  In order to achieve the above object, a gas supply device according to the present invention comprises a first cylinder connection receiving a first cylinder, a second cylinder connection receiving a second cylinder, and a gas obtained from the first cylinder connection. From the first pressure reducing device to the first pressure, a second pressure reducing device reducing the pressure of the gas obtained from the second cylinder connection portion to the second pressure lower than the first pressure, and the The switching valve capable of switching the outflow destination of the inflowing gas to the first path and the second path by an external operation, and the pressure of the flowing gas in the middle of the second path being lower than the second pressure A third pressure reducer for reducing pressure to a pressure, a first merging portion for merging the gas obtained from the first path and the gas flowing from the second path through the third decompressor, and the first merging portion The first inflow check valve Through a third path leading to a second junction, a fourth path through which a gas flowing from the second decompressor is merged with the second junction through a second check valve, and flowing from the second junction A fourth pressure reducer that reduces the pressure of the gas to a fourth pressure lower than the third pressure, and a gas outlet that sends out the gas obtained from the fourth pressure reducer to the outside.

  According to the present invention, it is possible to easily select which cylinder of the plurality of cylinders should be preferentially consumed.

It is a conceptual diagram of the gas supply apparatus in Embodiment 1 based on this invention. It is a conceptual diagram of the gas supply apparatus in Embodiment 2 based on this invention. It is a conceptual diagram of the gas supply apparatus in Embodiment 3 based on this invention. It is a conceptual diagram of the gas supply apparatus in Embodiment 4 based on this invention. It is a front view of the gas supply apparatus in Embodiment 5 based on this invention. It is a side view of the gas supply apparatus in Embodiment 5 based on this invention. It is a top view of the gas supply apparatus in Embodiment 5 based on this invention.

Embodiment 1
(Constitution)
A gas supply apparatus according to a first embodiment of the present invention will be described with reference to FIG.

  The gas supply device 101 according to the present embodiment includes a first cylinder connector 11 that receives the first cylinder 31, a second cylinder connector 12 that receives the second cylinder 32, and a gas obtained from the first cylinder connector 11. A first pressure reducer 13 for reducing pressure to a first pressure, a second pressure reducer 14 for reducing pressure of a gas obtained from the second cylinder connection 12 to a second pressure lower than the first pressure, and a first pressure reducer 13 The pressure of the flowing gas is set to the second pressure in the middle of the switching passage 10 which can switch the outflow destination of the gas flowing in from the first passage 81 to the second passage 82 by the operation from the outside, and the second passage 82 A third pressure reducer 15 for reducing the pressure to a lower third pressure; a first junction 17 for combining the gas obtained from the first path 81 and the gas flowing from the second path 82 through the third pressure reducer 15; , First junction 7, the third path 83 for guiding the gas flowing in from the first check valve 21 to the second junction 22 and the gas flowing in from the second pressure reducer 14 via the second check valve 22 to the second junction 18 And the fourth pressure reducing device 16 for reducing the pressure of the gas flowing in from the second mixing portion 18 to a fourth pressure lower than the third pressure, and the gas obtained from the fourth pressure reducing device 16 And a gas outlet 9 for delivering the

  Assuming that the first pressure to the fourth pressure are P1, P2, P3 and P4, respectively, P1> P2> P3> P4. For example, P1 = 0.75 MPa. For example, P2 = 0.6 MPa. For example, P3 = 0.5 MPa. For example, P4 = 0.38 MPa. It is conceivable that the fourth pressure is a value determined by a standard or the like as a pressure at the time of use.

  The first cylinder 31 and the second cylinder 32 are connected or attached to the gas supply device 101, but are not part of the gas supply device 101.

(Operation)
For convenience of description, let the gas pressure of the first cylinder 31 be PX, and let the gas pressure of the second cylinder 32 be PY. In the state of a new first cylinder 31, PX> P1. When the second cylinder 32 is new, PY> P2. As the residual amount of gas in each cylinder decreases, PX and PY decrease. Depending on the type of gas, some may decrease gradually, and some may decrease rapidly at some stage along the way.

(If you want to give priority to the gas of the first cylinder)
When it is desired to use the gas of the first cylinder 31 in preference to the gas of the second cylinder 32, the switching valve 10 is previously operated to select the first passage 81 among the first passage 81 and the second passage 82. You may set it. When set in this manner, the gas of the first cylinder 31 is reduced from the pressure PX to the first pressure P1 by the first pressure reducer 13, and the pressure P1 remains unchanged at the pressure P1 through the first path 81 to the first junction 17 and then to the first check valve 21. On the other hand, the gas of the second cylinder 32 is decompressed from the pressure PY to the second pressure P2 by the second decompressor 14 and reaches the second check valve 22 through the fourth path 84 while maintaining the pressure P2. Since the first pressure P1 upstream of the first check valve 21 is greater than the second pressure P2 upstream of the second check valve 22, the second junction 18 receives the first cylinder 31 from the first cylinder 31. Gas flows in at the first pressure P1, and the gas from the second cylinder 32 does not flow. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. In this state, the gas of the first cylinder 31 continues to be consumed.

  When the pressure PX is reduced due to the decrease of the remaining amount of the first cylinder 31 and P2 <PX <P1, the following occurs. Since PX <P1, the gas from the first cylinder 31 is not reduced in pressure by the first pressure reducer 13 and reaches the first check valve 21 with the pressure PX as it is. Since PX> P2, the gas from the first cylinder 31 flows into the second junction 18 at the pressure PX, and the gas from the second cylinder 32 does not flow. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. In this state, the gas of the first cylinder 31 continues to be consumed.

  When it becomes PX <P2 by the further reduction of the remaining amount of the first cylinder 31, it becomes as follows. Since PX <P2, the gas from the first cylinder 31 does not flow into the second junction 18, but instead the gas from the second cylinder 32 starts to flow at the second pressure P2. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. After this, the gas of the second cylinder 32 continues to be consumed.

  When the pressure PY decreases due to the decrease of the remaining amount of the second cylinder 32 and PY <P2, the following occurs. Since PY <P2, the gas from the second cylinder 32 is not reduced in pressure by the second decompressor 14 and reaches the second check valve 22 with the pressure PY as it is. Since the pressure is PX on the upstream side of the first check valve 21 and the pressure PY is on the upstream side of the second check valve 22, the functions of the first check valve 21 and the second check valve 22 Thus, the higher gas of PX and PY is automatically selected and flows into the second junction 18. Thereafter, the gases in the first cylinder 31 and the second cylinder 32 continue to be consumed until both the pressures PX and PY have dropped below the fourth pressure P4.

(If you want to give priority to the gas of the second cylinder)
When it is desired to use the gas of the second cylinder 32 in preference to the gas of the first cylinder 31, the switching valve 10 is operated in advance to select the second passage 82 among the first passage 81 and the second passage 82. You may set it. When set in this manner, the gas of the first cylinder 31 is decompressed from the pressure PX to the first pressure P1 by the first decompressor 13, and flows into the second path 82 as the pressure P1. Since the third pressure reducer 15 is located in the middle of the second path 82 and P1> P3, the pressure is reduced from P1 to P3. This gas reaches the first junction 17 at pressure P 3 and further reaches the first check valve 21. On the other hand, the gas of the second cylinder 32 is decompressed from the pressure PY to the second pressure P2 by the second decompressor 14 and reaches the second check valve 22 through the fourth path 84 while maintaining the pressure P2. Since the second pressure P2 on the upstream side of the second check valve 22 is larger than the first pressure P3 on the upstream side of the first check valve 21, the second merging portion 18 receives the second pressure P 2 from the second cylinder 32. Gas flows in at the second pressure P2, and the gas from the first cylinder 31 does not flow. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. In this state, the gas of the second cylinder 32 continues to be consumed.

  When the pressure PY decreases due to the decrease of the remaining amount of the second cylinder 32 and P3 <PY <P2, the following occurs. Since PY <P2, the gas from the second cylinder 32 is not reduced in pressure by the second decompressor 14 and reaches the second check valve 22 with the pressure PY as it is. Since PY> P3, the gas from the second cylinder 32 flows into the second junction 18 at a pressure PY, and the gas from the first cylinder 31 does not flow. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. In this state, the gas of the second cylinder 32 continues to be consumed.

  If PY <P3 due to a further reduction of the remaining amount of the second cylinder 32, the following occurs. Since PY <P3, the gas from the second cylinder 32 does not flow into the second junction 18, but instead the gas from the first cylinder 31 starts to flow at the third pressure P3. The gas is then depressurized to the fourth pressure P4 by the fourth pressure reducer 16. The gas at the fourth pressure P4 can be taken out from the gas outlet 9. After this, the gas of the first cylinder 31 continues to be consumed.

  In the case where the pressure PX decreases due to the decrease of the remaining amount of the first cylinder 31 and becomes PX <P3, the following occurs. Since PX <P3 <P1, the gas from the first cylinder 31 is not reduced in pressure not only in the first pressure reducer but also in the third pressure reducer 15, and reaches the first check valve 21 with the pressure PX as it is. Since the pressure is PX on the upstream side of the first check valve 21 and the pressure PY is on the upstream side of the second check valve 22, the functions of the first check valve 21 and the second check valve 22 Thus, the higher gas of PX and PY is automatically selected and flows into the second junction 18. Thereafter, the gases in the first cylinder 31 and the second cylinder 32 continue to be consumed until both the pressures PX and PY have dropped below the fourth pressure P4.

(Action / effect)
According to the present embodiment, which of the two cylinders is to be used preferentially can be determined depending on which of the two paths is selected by the operation of the switching valve 10. If you first select the cylinder you want to use preferentially, as the gas pressure from the cylinder decreases with the use of gas, the supply source to the cylinder that was not selected from the selected cylinders is selected. Switching is performed automatically.

  In the present embodiment, the selection of the cylinder can be performed not by adjusting the set value of the pressure reducer, but by selecting the flow path of the gas, so the target to be operated by the user is not the adjusting screw of the pressure reducer. It is a switch of a switching valve. Therefore, it can be easily operated without requiring a strong force. Therefore, in the gas supply device in the present embodiment, it is possible to easily select which cylinder of the plurality of cylinders should be preferentially consumed.

  In addition, although the pressure of the first cylinder 31 and the pressure of the second cylinder 32 both have been reduced to less than the fourth pressure P4 for convenience of explanation here, in reality, for the sake of safety, It is preferable to finish the gas use operation earlier. Alternatively, if it is necessary to continue the gas use operation for a longer time, it is desirable to replace any of the cylinders at an appropriate timing.

Second Embodiment
(Constitution)
A gas supply apparatus according to a second embodiment of the present invention will be described with reference to FIG. The gas supply device 102 in the present embodiment is similar to the gas supply device 101 described in the first embodiment in terms of the basic configuration, but differs in the following points.

  The gas supply device 102 in the present embodiment includes a pressure gauge 8 between the fourth pressure reducer 16 and the gas outlet 9.

(Action / effect)
Also in the present embodiment, the effects described in the first embodiment can be obtained. Furthermore, since the gas supply device 102 in the present embodiment is provided with the pressure gauge 8 at a position downstream of the fourth pressure reducer 16 that performs final pressure reduction and upstream of the gas outlet 9, it is currently taken out from the gas outlet 9. The pressure of the gas can be clearly grasped. Therefore, the user can use the gas at ease.

Third Embodiment
(Constitution)
A gas supply apparatus according to a third embodiment of the present invention will be described with reference to FIG. The gas supply device 103 in the present embodiment is similar to the gas supply device 101 described in the first embodiment in terms of the basic configuration, but differs in the following points.

  In the gas supply device 103 according to the present embodiment, the pressure detected by the first pressure switch 23 disposed between the first pressure reducer 13 and the switching valve 10 and the first pressure switch 23 is lower than a predetermined reference. And a first alarm device 25 for emitting an alarm.

(Action / effect)
It is preferable that the “fixed reference” for the first alarm device 25 to issue an alarm be a pressure slightly higher than the second pressure P2. With this setting, when the pressure of the gas from the first cylinder 31 decreases and approaches the second pressure P2, the first alarm device 25 can issue an alarm, and this alarm causes the user to Can know that the first cylinder 31 should be replaced.

  According to the present embodiment, the user can accurately grasp the time to replace the first cylinder 31. When the first cylinder 31 is removed for replacement, the gas from the second cylinder 32 continues to flow into the second junction 18 because of the functions of the first check valve 21 and the second check valve 22. The supply of gas from the gas outlet 9 to the outside never ceases.

  The gas supply device 103 according to the present embodiment issues an alarm when the pressure detected by the second pressure switch 24 disposed in the middle of the fourth path 84 and the second pressure switch 24 is lower than a certain reference. Preferably, a second alarm device 26 is provided.

  Under the present circumstances, it is preferable to make "the fixed reference | standard" for the 2nd alarm apparatus 26 to raise an alarm a pressure somewhat higher than 3rd pressure P3. With this setting, when the pressure of the gas from the second cylinder 32 decreases and approaches the third pressure P3, the second alarm device 26 can issue an alarm, and this alarm causes the user to Can know that the second cylinder 32 should be replaced.

  As in the gas supply device 103 shown in FIG. 3, it is preferable that all of the first pressure switch 23, the first alarm device 25, the second pressure switch 24, and the second alarm device 26 be provided. With this configuration, it is possible to know the timing of replacement of each cylinder by using an alarm even when any cylinder is used with priority.

  The "alarm" referred to here is preferably a notification to the user by sound, light, or both. As shown in FIG. 3, the first alarm device 25 preferably comprises a first alarm lamp 25a. The second alarm device 26 preferably comprises a second alarm lamp 26a. The alarm device may visually notify the user by means other than the lamp. The alarm device may notify the user by an electrical signal, digital information, radio waves, vibration or the like.

Embodiment 4
(Constitution)
A gas supply apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. The gas supply device 104 in the present embodiment is similar to the gas supply device 103 described in the third embodiment in terms of the basic configuration, but differs in the following points.

  The gas supply device 104 in the present embodiment includes the first load sensor 28 that detects the weight of the first cylinder 31, and the first alarm device 25 detects the weight of the first cylinder 31 detected by the first load sensor 28. Issues an alert when the lightness falls below a certain standard.

(Action / effect)
In the present embodiment, not only the pressure detected by the first pressure switch 23 but also the first cylinder 31 detected by the first load sensor 28 when detecting that the remaining amount of the first cylinder 31 has decreased. Since the weight of the first cylinder 31 is also monitored, it can be detected more reliably if the remaining amount of the first cylinder 31 is reduced to a certain extent or more.

  Although the weight of the first cylinder 31 may also be monitored only by the detection by the first load sensor 28 without detection by the first pressure switch 23, the first pressure switch 23 and the first load sensor 28 It is more preferable to monitor the remaining amount of the first cylinder 31 by using both of them.

  In addition, as shown in FIG. 4, the gas supply device 104 in the present embodiment includes a second load sensor 29 that detects the weight of the second cylinder 32, and the second alarm device 26 is a second load sensor 29. Preferably, an alarm is issued when the weight of the second cylinder 32 detected by the sensor is less than a certain standard. The monitoring of the remaining amount of the second cylinder 32 can also be similar to the monitoring of the remaining amount of the first cylinder 31. That is, the weight of the second cylinder 32 may also be monitored only by the detection by the second load sensor 29 without the detection by the second pressure switch 24. However, the second pressure switch 24 and the second load sensor 29 may be used. More preferably, the remaining amount of the second cylinder 32 is monitored by using both of them together.

  In addition, although it can be said common to several embodiment described so far, it is preferable that the 1st cylinder 31 and the 2nd cylinder 32 are both cylinders of medical gas. Examples of the medical gas include oxygen, carbon dioxide, and laughing gas. The first cylinder 31 and the second cylinder 32 are preferably stored in a liquid state in a cylinder and used at a work site. When the gas contained in the cylinder is in a liquid state, the rate of decrease of the pressure of the gas in the process of decreasing the remaining amount of the cylinder along with the use of the gas is not constant. When the liquid state gas in the cylinder runs out, the pressure tends to begin to fall sharply. Therefore, it is important to specify the priority order of the cylinders and to grasp the time to be replaced, and the benefits of the effects described in the above embodiments become remarkable. For example, in the case of carbon dioxide or laughing gas, it is contained in a cylinder in a liquid state and used at a work site, so when the first cylinder 31 and the second cylinder 32 are cylinders of carbon dioxide or laughing gas The benefits of the effects described in the above embodiments become significant.

Fifth Embodiment
(Constitution)
A gas supply apparatus according to a fifth embodiment of the present invention will be described with reference to FIGS. 5 to 7. The front view, the side view, and the top view of the gas supply device 105 in the present embodiment are respectively shown in FIGS. The gas supply device 105 in the present embodiment is similar to the gas supply device 103 described in the third embodiment in terms of the basic configuration, but differs in the following points.

  The gas supply device 105 in the present embodiment includes a cylinder holding unit 1 for holding the first cylinder and the second cylinder, and a caster 2 capable of integrally moving the cylinder holding unit 1 and the gas outlet 9.

  As shown in FIG. 5, the front plate 3 is disposed on the front side so that the cylinder can not be seen from the front. The display unit 5 is provided on the upper side of the front plate 3 as a flat portion facing obliquely upward. In the display unit 5, a pressure gauge 8, a first alarm lamp 25a, and a second alarm lamp 26a are disposed. A changeover switch 6 and a gas outlet 9 are disposed in the front plate 3. The changeover switch 6 is included in the changeover valve 10. The changeover switch 6 is a switch for operating the changeover valve 10. The first alarm lamp 25 a is included in the first alarm device 25. The second alarm lamp 26 a is included in the second alarm device 26. For example, when an alarm is issued by each alarm device, each alarm lamp blinks and a sound is emitted. Each of the first alarm lamp 25a and the second alarm lamp 26a may double as a release button. In the case where the first alarm lamp 25a and the second alarm lamp 26a also serve as the release button, it may be in a lighting state after being pressed as the release button. The first alarm lamp 25a and the second alarm lamp 26a may be constantly lit, for example, during normal operation before the alarm is issued. By constantly turning on in this manner during normal operation, it is possible to indicate to the user that the alarm device is functioning properly.

  As shown in FIGS. 6 and 7, the gas supply device 105 includes a device body 27. The device body 27 is disposed to occupy a forward position in the entire gas supply device 105. The display unit 5, the changeover switch 6 and the gas outlet 9 are provided in the apparatus main body 27.

  6 and 7 show the gas supply device 105 in a state where no cylinder is attached. The first cylinder connection portion 11 and the second cylinder connection portion 12 are connected to the apparatus main body 27 by a gas pipe 19. The gas pipe 19 is flexible, and in a state in which the gas cylinder 19 is not attached, the first cylinder connection portion 11 and the second cylinder connection portion 12 actually hang down from the upper portion of the apparatus main body 27. However, in FIG. 6 and FIG. 7, the 1st cylinder connection part 11 and the 2nd cylinder connection part 12 are displayed on the position at the time of mounting | wearing with a cylinder, for the facilities of description.

  As shown in FIGS. 6 and 7, the two cylinders are attached to the cylinder holder 1 so as to be seen from the upper side and the side. Frames 4 are disposed on the left and right so as to sandwich the cylinder holding portion 1 to protect the cylinder. A power cable 7 extends rearward from the device body 27.

  The casters 2 are provided at the four corners of the lower surface in this example, and the entire gas supply device 105 can be smoothly moved by the casters 2.

(Action / effect)
In the present embodiment, since the cylinder holding portion 1 and the gas outlet 9 can be integrally moved, the caster 2 can be moved easily by the user at the time of use. Therefore, it can be set as the gas supply apparatus excellent in portability.

  Here, the four casters 2 on the lower surface of one gas supply device 105 are provided, but the number of places where the casters 2 are provided may be other than four. Although one caster 2 is displayed as including two wheels in FIG. 5, this is merely an example, and the structure of the caster 2 is not limited thereto.

  The appearance of the gas supply device 105 described in the present embodiment is merely an example, and the present invention is not limited thereto.

  It should be noted that the gas outlet 9 is preferably provided with a so-called gas-specific connector, which is common to the embodiments described above. In other words, the gas outlet 9 preferably comprises a connector having a shape corresponding to the type of gas. The “shape corresponding to the type of gas” mentioned here is a shape which is predetermined so as to correspond to the type of gas on a one-to-one basis. The “shape corresponding to the type of gas” is such that connectors for different types of gas can not be geometrically connected even if they are connected, but can only be connected if they are connectors for the same type of gas It is a shape that has been taken into consideration. By adopting this configuration, connection errors can be prevented at the gas use site.

  Although it is assumed that the gas supply apparatus shown by said each embodiment is used as a supply apparatus for medical gas, it is also possible to use for gas other than medical gas. Although the gas supply device shown in the above-mentioned each embodiment is suitable for being used at a medical site, it may be used outside the medical site.

Note that a plurality of the above embodiments may be appropriately combined and adopted.
In addition, the said embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is indicated not by the above description but by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

  DESCRIPTION OF SYMBOLS 1 cylinder holding part, 2 castors, 3 front plate, 4 frame, 5 display part, 6 change-over switch, 7 power supply cable, 8 pressure gauge, 9 gas outlet, 10 change-over valve, 11 1st cylinder connection part, 12 2nd cylinder Connection portion, 13 first pressure reducer, 14 second pressure reducer, 15 third pressure reducer, 16 fourth pressure reducer, 17 first merge portion, 18 second merge portion, 19 gas pipe, 21 first check valve, 22 second check valve, 23 first pressure switch, 24 second pressure switch, 25 first alarm device, 25a first alarm lamp, 26 second alarm device, 26a first alarm lamp, 27 device main body, 28 first Load sensor, 29 second load sensor, 31 first cylinder, 32 second cylinder, 81 first path, 82 second path, 83 third path, 84 fourth path, 101, 102, 103, 104, 105 Supply device.

Claims (9)

A first cylinder connection receiving the first cylinder;
A second cylinder connection receiving the second cylinder;
A first decompressor for decompressing the gas obtained from the first cylinder connection to a first pressure;
A second decompressor for decompressing the gas obtained from the second cylinder connection to a second pressure lower than the first pressure;
A switching valve capable of switching an outflow destination of the gas flowing in from the first pressure reducer to a first path and a second path by an operation from the outside;
A third pressure reducer configured to reduce the pressure of the flowing gas to a third pressure lower than the second pressure in the middle of the second path;
A first joining portion for joining the gas obtained from the first path and the gas flowing from the second path through the third pressure reducer;
A third path for guiding the gas flowing in from the first junction through the first check valve to the second junction;
A fourth path for merging the gas flowing in from the second pressure reducer via the second check valve into the second merging portion;
A fourth decompressor configured to decompress the gas flowing in from the second junction to a fourth pressure lower than the third pressure;
A gas outlet for sending out the gas obtained from the fourth pressure reducer to the outside.   The gas supply device according to claim 1, further comprising a pressure gauge between the fourth pressure reducer and the gas outlet. A first pressure switch disposed between the first pressure reducer and the switching valve;
The gas supply device according to claim 1 or 2, further comprising: a first alarm device that issues an alarm when the pressure detected by the first pressure switch is lower than a predetermined reference. A second pressure switch disposed in the middle of the fourth path;
The gas supply device according to any one of claims 1 to 3, further comprising: a second alarm device that issues an alarm when the pressure detected by the second pressure switch is lower than a predetermined reference. A first load sensor for detecting the weight of the first cylinder is provided, and the first alarm device generates an alarm when the weight of the first cylinder detected by the first load sensor becomes lighter than a certain reference. The gas supply apparatus according to claim 3, which emits gas. A second load sensor for detecting the weight of the second cylinder is provided, and the second alarm device generates an alarm when the weight of the second cylinder detected by the second load sensor becomes lighter than a certain reference. The gas supply apparatus according to claim 4, which emits gas.   The gas supply device according to any one of claims 1 to 6, wherein each of the first cylinder and the second cylinder is a cylinder for medical gas. A cylinder holding unit for holding the first cylinder and the second cylinder;
The gas supply apparatus according to any one of claims 1 to 7, further comprising a caster capable of integrally moving the cylinder holding portion and the gas outlet.   The gas supply device according to any one of claims 1 to 8, wherein the gas outlet comprises a connector having a shape corresponding to the type of gas.

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