JP7393232B2 - tank car - Google Patents

Description

The present invention relates to a tank car equipped with a tank for loading liquid.

Patent Document 1 discloses a tank truck capable of sucking liquid water into a tank, loading the tank, and discharging the loaded water. This tank car is equipped with three switching valves for switching between discharging water from a tank loaded with water and sucking water into the tank.

The switching valve has three ports to which three pipes are connected to the valve body, and a valve body provided inside the valve body rotates to open and close the three ports, thereby switching the flow path. The system switches between discharging water from the tank and sucking water into the tank.

In the switching valve configured as described above, all the ports may communicate with each other while the valve body is rotating. When this state of communication occurs, the water in the tank may leak out through the pipes from an unintended location, and early improvement is desired.

Japanese Patent Application Publication No. 2008-7994

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tank car that can prevent fluid from flowing out from an unintended location during switching.

The tank car of the present invention is a tank car equipped with a tank for loading liquid, and includes a first flow path for discharging the liquid in the tank or sucking the liquid into the tank, and a first flow path for discharging the liquid in the tank or sucking the liquid into the tank. a second channel that guides the liquid from the channel to the discharge section that discharges it; a third channel that sucks the liquid stored in a storage section other than the tank; and the first channel. a switching valve to which the second flow path and the third flow path are connected; and a switching valve that connects the first flow path and the second flow path so that the liquid in the tank moves to the discharge part. a control unit that switches the switching valve between a state in which the third flow path and the first flow path communicate with each other so that the liquid in the storage section is in communication with the third flow path and the liquid in the storage section is transferred to the tank; The invention is characterized in that a second on-off valve that can be opened and closed is provided in the second flow path, and a third on-off valve that can be opened and closed is provided in the third flow path.

According to the present invention, if the second on-off valve provided in the second channel and the third on-off valve provided in the third channel are closed before switching the switching valve, the switching valve can be Even if all the ports communicate at the time of switching, the liquid in the tank can be prevented from flowing out to the second flow path and the third flow path via the first flow path. This can prevent fluid from flowing out from an unintended location during switching. After switching, the first flow path and the second flow path communicate with each other, so that the liquid in the tank is guided from the first flow path to the discharge part via the second flow path to the outside. It can be discharged. Further, by communicating the third flow path and the first flow path, the liquid from the third flow path can be sucked into the tank via the first flow path.

Further, in the tank car of the present invention, when the control unit receives a suction command signal to suck liquid into the tank, the control unit closes the second on-off valve and then connects the third flow path with the control unit. The configuration may be such that the switching valve is switched so as to communicate with the first flow path.

As described above, when the control unit receives a suction command signal to suck liquid into the tank, it closes the second on-off valve and then switches the switching valve. Even if all the ports communicate, it is possible to prevent the fluid from the first flow path from flowing into the second flow path and flowing out to the outside through the discharge portion.

Further, in the tank car of the present invention, when the control unit receives a discharge command signal for discharging the liquid in the tank to the discharge unit, the control unit closes the third on-off valve and then closes the third on-off valve. The switching valve may be switched so that the flow path and the second flow path communicate with each other.

According to the above configuration, when the control unit receives a discharge command signal for discharging the liquid in the tank to the discharge unit, the control unit closes the third on-off valve and then switches the switching valve so that all Even if the openings of the first and second channels are communicated, it is possible to prevent the fluid from the first channel from flowing into the third channel and flowing out to the outside.

Further, in the tank car of the present invention, the tank includes a priming liquid storage section for supplying liquid as a priming liquid to the third flow path, and the first flow path is connected to the priming liquid storage section. a fourth flow path that sucks the liquid into the tank by supplying liquid from the tank to the third flow path or sucking the liquid into the priming liquid storage part, and a downstream side of the fourth flow path; a fifth channel for discharging the liquid in the tank from a discharge port provided in the tank; a fourth on-off valve that can be opened and closed is provided in the fourth channel; A fifth on-off valve that can be opened and closed is provided in the fifth flow path, and when the control unit receives a suction command signal for sucking liquid into the tank, the control unit controls the second on-off valve and the fifth on-off valve. After closing the valve, the switching valve is switched so that the third flow path and the fourth flow path communicate with each other, and the third on-off valve and the fourth on-off valve are opened. It's okay.

According to the above configuration, when receiving the priming liquid supply command signal for supplying priming liquid, the control unit closes the second on-off valve and the fifth on-off valve, and then switches the switching valve and closes the third on-off valve. By opening the valve and the fourth on-off valve, even if all the ports are in communication, the liquid in the tank can be prevented from flowing out from the second channel through the discharge part.

Further, in the tank car of the present invention, when the control section receives a discharge command signal to discharge the liquid in the tank to the discharge section, the third on-off valve and the fourth on-off valve are closed. Alternatively, the switching valve may be switched so that the fifth flow path and the second flow path communicate with each other.

According to the above configuration, when the control unit receives the discharge command signal to discharge the liquid in the tank to the discharge unit, the control unit closes the third on-off valve and the fourth on-off valve, and then performs the switching operation on the switching valve. By doing so, even if all the ports are in communication, the fluid in the tank can be prevented from flowing out from the fifth flow path through the switching valve and the second flow path to the outside.

Further, the tank car of the present invention includes an operation switch that opens and closes the second on-off valve, and the control unit outputs a discharge command signal for discharging the liquid in the tank to the discharge unit, and switches the switching valve. The second on-off valve may be controlled to be opened and closed by the operation switch when the completion signal is received.

According to the above configuration, when the control unit receives the discharge command signal for discharging the liquid in the tank to the discharge unit and the switching completion signal of the switching valve, the control unit performs an operation to open the second on-off valve using the operation switch, The fluid in the tank is discharged to the outside through the opened second on-off valve.

Further, the tank car of the present invention includes an operation switch that opens and closes the second on-off valve, and when the control unit receives a suction command signal for sucking liquid into the tank, the control unit controls the operation of the operation switch to operate the operation switch. The configuration may be such that the control is performed so as to ignore the opening/closing operation of the second opening/closing valve.

According to the above configuration, when the control unit receives the suction command signal to suck liquid into the tank, the control unit ignores the opening/closing operation of the second on-off valve by the operation switch, so that the second on-off valve is not opened. The liquid sucked into the tank can be prevented from flowing out through the second flow path.

The present invention prevents fluid from flowing out from unintended locations during switching by closing on-off valves provided in each of the second flow path and the third flow path before switching the changeover valve. It is possible to provide a tank car that can prevent this.

It is an overall side view of a tank car. It is a piping diagram to a tank. FIG. 2 is a block diagram showing a control configuration of the present invention. It is an explanatory view showing an operation state when performing automatic priming. It is an explanatory view showing an operation state when performing automatic priming. It is an explanatory view showing an operation state when performing automatic priming. It is an explanatory view showing an operation state when performing automatic priming. FIG. 6 is an explanatory diagram showing an operating state when water is sucked into the tank. FIG. 6 is an explanatory diagram showing an operating state when water is sucked into the tank. FIG. 6 is an explanatory diagram showing an operating state when water is sucked into the tank. FIG. 3 is an explanatory diagram showing an operating state when stopping. FIG. 3 is an explanatory diagram showing an operating state when stopping. FIG. 3 is an explanatory diagram showing an operating state when discharging water. FIG. 3 is an explanatory diagram showing an operating state when discharging water. FIG. 3 is an explanatory diagram showing an operating state when discharging water. FIG. 3 is an explanatory diagram showing an operating state when discharging water.

EMBODIMENT OF THE INVENTION Hereinafter, the water sprinkler truck 1 as a tank truck based on one Embodiment of this invention is demonstrated based on FIG. The water sprinkler truck 1 includes a driver's cab 3 in which an engine 2, which is a drive source for running, is mounted at the bottom, a tank 5 mounted on a frame 4 and long in the front and back direction and loaded with water for spraying water, and a tank 5 that is long in the front and back direction and carries water for discharging water. A switching valve (four-way valve in this embodiment) 9 (see FIG. 2) for changing the flow path to discharge or draw water into the tank 5, and a switching valve 9 connected to the switching valve 9 to forcefully feed water. A front water discharging nozzle 7 and a rear water discharging nozzle 8 are provided for discharging water under pressure through piping when the pump 6 is driven. The pump 6 is driven using the power of the engine 2, and is configured such that the higher the rotational speed of the engine 2, the greater the driving force of the pump 6. Note that the rotation speed of the engine 2 changes depending on the amount of depression of the accelerator pedal, and also changes according to the rotational position of a rotary engine speed setting switch (not shown) provided on the vehicle body.

As shown in FIG. 2, the tank 5 includes a priming chamber 10 for storing priming water. The tank 5 also includes a full water sensor 11 as a detection means for detecting that the inflow amount of water has reached a set amount (full water). The priming chamber 10 is located at the bottom of the tank 5 in front of the tank car. In addition, the priming chamber 10 is connected to a fourth flow path R4, which will be described later, and a discharge port 5A, which will be described later, formed in the tank 5 is connected to a fifth flow path R5, which is different from the fourth flow path R4, which will be described later. Even if all the water in the tank 5 is used up, the water in the priming chamber 10 remains without being drained. Furthermore, by filling the pipe with water from the priming chamber 10, air in the pipe is removed. This allows water to flow quickly. The fourth flow path R4 and the fifth flow path R5 constitute a first flow path R1 for discharging the liquid in the tank 5 or sucking the liquid into the tank 5.

Further, a discharge port 5A is formed at the bottom of the tank 5 to discharge the water in the tank 5 downward from the front bottom of the tank 5, and one end of the first tank pipe 12 is connected to the discharge port 5A. ing. Also, one end of the priming pipe 13 is connected to a priming port 5B formed at the bottom of the priming chamber 10 provided in the tank 5, and the other end of the priming pipe 13 is connected to the first tank pipe 12 on the downstream side. It is connected to the. The first tank pipe 12 is provided with a tank valve 14 that is a fifth on-off valve that can be opened and closed, and the priming pipe 13 is provided with a priming valve 15 that is a fourth on-off valve that can be opened and closed. One end of the merging pipe 16 is connected to the merging part of the first tank piping 12 and the priming water piping 13, and the other end (downstream end) of the merging pipe 16 is connected to one mouth (port) 9A of the switching valve 9. It is connected to the. As described above, the lower end (downstream end) of the first tank pipe 12 and the lower end (downstream end) of the priming water pipe 13 are joined by one merging pipe 16 .

Further, a second tank pipe 17 for discharging water in the tank 5 downward from the rear bottom of the tank 5 is connected. The second tank piping 17 is provided with a rear water discharge valve 18 that is a sixth on-off valve that can be opened and closed. Further, two branch pipes 19 and 20 are connected to the downstream end of the second tank pipe 17, and each of the branch pipes 19 and 20 is provided with a manually operated valve 21. Rear water discharge nozzles 8, 8 are connected to the downstream ends of 21, 21.

The switching valve 9 includes a valve body (not shown) having four ports 9A, 9B, 9C, and 9D, and a valve body (not shown) rotatably disposed inside the valve body. It consists of a general-purpose four-way valve. The four ports 9A, 9B, 9C, and 9D provided on the valve body serve as a priming port 5B for discharging water in the priming chamber 10 or sucking water into the tank 5 by sucking water into the priming chamber 10. A first port 9A is connected to a discharge port 5A for discharging water from the tank 5, and a second port 9B is connected to a suction port of the pump 6 via a piping 6A. A third port 9C connected via piping 6B to a discharge port for discharging water from the tank 5 serves as a discharge port for discharging water from the tank 5 and a suction port for supplying water from a water storage tank 31, which will be described later. This is the fourth opening 9D. A relief valve 22 is provided in the flow path on the side where the fluid is fed under pressure from the pump 6 .

A pipe 23 connected to the fourth port 9D is branched into two branch pipes 24 and 25 at the downstream end. One branch pipe 24 is provided with a front water discharge valve 26 which is a second on-off valve, and two branch pipes 27 and 28 are connected to the downstream end of one branch pipe 24. A manually operated valve 29 is provided in each of the branch pipes 27 and 28, and front water discharge nozzles 7 and 7 are connected to downstream ends of the manually operated valves 29 and 29, respectively. These front water discharge nozzles 7 constitute a discharge section that discharges water to the outside. The other branch pipe 25 is provided with a water intake valve 30 that is a third on-off valve, and the downstream end of the other branch pipe 25 is provided with a strainer that is poured into the water W in a water storage tank 31 that is a storage section. It is equipped with 32. The water storage tank 31 may be a pond, a river, or a container, tank, or the like that can store water. Further, a water discharge pipe 33 is branched and connected to the middle of the pipe 23 connected to the fourth port 9D. The water discharge pipe 33 is provided with a water discharge valve 35 that can open and close the water discharge port 34 by manual operation.

The fifth flow path R5 is a flow path formed by the first tank pipe 12 and the confluence pipe 16 between the bottom of the tank 5 and the first port 9A of the switching valve 9. Further, the fourth flow path R4 is a flow path formed between the bottom of the priming chamber 10 of the tank 5 and the first port 9A of the switching valve 9 by the priming pipe 13 and the merging pipe 16. In addition, a second flow path R2 is formed between the branch pipes 27, 28 and the fourth port 9D of the switching valve 9 by the pipe (merging pipe where the branch pipes 24, 25 join together) 23 and one pipe 24. be done. Further, a third flow path R3 is formed between the strainer 32 and the fourth port 9D of the switching valve 9 by the pipe 23 and the other pipe 25.

FIG. 3 is a block diagram showing the control configuration of the present invention. An ON-OFF signal from the water discharge button 36 to prepare for water discharge, and a front operation switch 37 that opens and closes the second on-off valve 26 to discharge water after the water discharge button 36 is pressed and preparations for water discharge are completed. an open/close signal from the rear operation switch 38 that opens and closes the rear water discharge valve 18 which is the sixth on-off valve, an ON-OFF signal from the priming button 39, an ON-OFF signal from the suction button 40. , a control section S to which the full water signal from the full water sensor 11 is input, and the control section S controls the second on-off valve to the sixth on-off valve 26, 30, 15, 14, according to the input signal. Opening/closing operations of the pump 18, driving and stopping operations of the pump 6, and switching operations of the switching valve 9 are performed.

The water spray button 36 is a push button for starting or ending water spray. The front operation switch 37 is a switch that is turned on when starting water discharge from the front water discharge nozzle 7, and the operation of the front operation switch 37 switches the front water discharge valve 26 into an open or closed state. The rear operation switch 38 is a switch that is turned on when starting water discharge from the rear water discharge nozzle 8, and the operation of the rear operation switch 38 switches the rear water discharge valve 18 into an open or closed state. Note that when the rear side operation switch 38 is turned on to discharge water, the water in the tank 5 is caused to fall under its own weight, and water is discharged from the rear water discharge nozzle 8 instead of the water being pumped from the pump 6. Note that the water pump 6 may be configured to discharge water from the rear water discharge nozzle 8. Although a front operation switch 37 and a rear operation switch 38 are provided here, a single operation switch that can start discharging water at the same time may be used.

The priming button 39 is a push button for causing water from the priming chamber 10 to flow from the fourth flow path R4 to the third flow path R3. The suction button 40 is a push button for starting suction of water into the tank 5.

A description will be given of how the control unit S automatically drives and controls the on-off valves 26, 30, 15, 14, and 18 and the switching valve 9 by operating the push button or switch described above. First, the engine and pump 6 are connected by operating a PTO switch (not shown) in the driver's seat, and the pump 6 is started.

[Priming operation]
When the priming button 39 is turned on, the control unit S closes the three valves, the tank valve 14, the front water discharge valve 26, and the rear water discharge valve 18 (see FIG. 4A), and then closes the priming valve 15 in the closed state and the water intake in the closed state. While opening the valve 30, the switching valve 9 is switched so that the fourth flow path R4 and the third flow path R3 communicate with each other (see FIG. 4B). By switching in this manner, even if all the ports 9A to 9D communicate with each other when switching the switching valve 9, water can be prevented from leaking from the front water discharge nozzle 7. In addition, it is more preferable to switch the switching valve 9 before opening the priming valve 15 in the closed state and the water intake valve 30 in the closed state. Furthermore, since the rear water discharge valve 18 is closed, water can be prevented from leaking from the rear water discharge nozzle 8. In this state, the priming water flows from the priming chamber 10 to the fourth flow path R4, and then flows to the third flow path R3 through the switching valve 9 (see FIG. 4C). As a result, by filling the water in the priming chamber 10 into the four pipes 13, 16, 23, and 25, the air in the four pipes 13, 16, 23, and 25 is vented, and the water can flow quickly. That's what I do.
The control unit S waits until a predetermined period of time has elapsed from the opening of the priming valve 15 and the water intake valve 30 and the completion of switching the switching valve 9, and then draws the priming water toward the pump 6 (by connecting the fourth port 9D to the second opening). The switching valve 9 is switched so that the third port communicates with the first port 9B and the third port communicates with the first port 9A, respectively. By driving the pump 6, the front pipes 13, 16, 6A, 6B, 23, and 25 are filled with water (see FIG. 4D). By continuing to drive the pump 6, water from the water tank 31 passes through the third flow path R3, the switching valve 9, the pump 6, the fourth flow path R4, and enters the tank 5 via the priming chamber 10. water is inhaled (see Figure 5C). When the control section S receives a full water signal from the full water sensor 11 by sucking water into the tank 5, the controller S shifts to a stop operation (described later).
After the predetermined time (for example, 20 seconds) has elapsed as described above, the control unit S determines that the four pipes 13, 16, 23, and 25 are filled with water.

[Water absorption operation]
Next, when the suction button 40 is pressed, a suction command signal for sucking water into the tank 5 is output. When the control unit S receives this suction command signal, as described above, after closing the tank valve 14, front water discharge valve 26, and rear water discharge valve 18 (see FIG. 5A), the priming valve 15 is in the closed state, and the priming valve 15 is in the closed state. At the same time, the water intake valve 30 of The switching valves 9 are switched so that the ports 9C and the first ports 9A are respectively communicated with each other (see FIG. 5B). By switching in this manner, even if all the ports 9A to 9D communicate with each other when switching the switching valve 9, water can be prevented from leaking from the front water discharge nozzle 7. In addition, it is more preferable to switch the switching valve 9 before opening the priming valve 15 in the closed state and the water intake valve 30 in the closed state. Furthermore, since the rear water discharge valve 18 is closed, water can be prevented from leaking from the rear water discharge nozzle 8. When the switching of the switching valve 9 is completed, water from the water tank 31 is driven to the priming chamber 10 by driving the pump 6 through the third flow path R3, the switching valve 9, the pump 6, and the fourth flow path R4. Water is drawn into the tank 5 through the tank 5 (see FIG. 5C). When the control unit S receives a full water signal from the full water sensor 11 by sucking water into the tank 5, it shifts to a stop operation.

[Stopping operation]
When the inhalation is completed, the control section S shifts to a stop operation. Specifically, as shown in FIG. 6A, the control unit S closes all the valves, which are the tank valve 14, the priming valve 15, the front water discharge valve 26, the water intake valve 30, and the rear water discharge valve 18. Thereafter, the switching valve 9 is switched to the stop position (see FIG. 6B), and the stop operation is completed. Also in this case, since all the valves (tank valve 14, priming valve 15, front water discharge valve 26, water intake valve 30, rear water discharge valve 18) are closed, when switching the switching valve 9, all ports 9A to 9D are closed. Even if there is communication, fluid (water) can be prevented from flowing out from an unintended location during switching.

Note that a stop button may be further provided, and the stop operation may be executed when the stop button is operated from preparation for inhalation to before detection by the full water sensor 11.
The control unit S controls the operation of the second opening/closing valve ( If the configuration is such that the opening/closing operation of the front water discharge valve 26) is ignored, the second opening/closing valve (front water discharge valve 26) is opened and the liquid sucked into the tank 5 flows through the second flow path R2 (see FIG. 2). ) is guided to the discharge part (front water discharge nozzle 7) and can be prevented from flowing out to the outside.

[Water spray operation]
Next, the water spraying operation will be explained. First, when the water spraying button 36 is pressed, preparations for water spraying are started. That is, when the control section S receives an ON signal from the water discharge button 36, that is, a discharge command signal to discharge water in the tank 5 to the discharge section (front water discharge nozzles 7, 7), as shown in FIG. 7A, the control section S closes three valves, the priming valve 15, the tank valve 14, and the water intake valve 30, and then opens the closed tank valve 14 (see FIG. 7B), and also opens the first port 9A and the second port 9A. The switching valve 9 is switched so that the opening 9B communicates with the third opening 9C and the fourth opening 9D communicates with each other. As a result, even if all the ports 9A to 9D communicate with each other when switching the switching valve 9, water in the tank 5 is not discharged to the discharge portion (front water discharge nozzles 7, 7) through the second flow path R2. In addition, it is more preferable to switch the switching valve 9 before opening the closed tank valve 14.Then, the water from the fifth flow path R5 passes through the switching valve 9 and the pump 6 to the second (See FIG. 7C).

At this time, if the control unit S is configured to open and close the front operation switch 37 when it receives the switching completion signal of the switching valve 9, the front operation switch 37 can be operated after the switching valve 9 is switched. By turning on the switch 37, water can be sprayed from the front water spray nozzle 7, but the front operation switch 37 may be configured to be open/closed at all times. Further, by turning on the rear operation switch 38, water can also be sprayed from the rear water spray nozzle 8. The operator may be informed whether the operations of the front operation switch 37 and the rear operation switch 38 are valid or invalid by means of a lamp or sound. Note that FIGS. 7A to 7D show a case where the front operation switch 37 and the rear operation switch 38 are valid.

For example, when the water truck 1 is in a stopped state with the parking brake turned ON, the water discharge valve 35 of the water discharge pipe 33 can be manually opened to discharge water from the water discharge pipe 33, as shown in FIG. 7D. It shows the case. When discharging water, it is possible to change the amount of water discharged by adjusting the output of the pump 6 by operating the engine rotation speed setting switch.

The present invention can be modified in various ways without departing from its spirit. In addition, the specific configuration of each part is not limited to the above embodiment. For example, tank trucks include not only water sprinklers but also tank trucks that can load liquids such as gasoline, diesel oil, and kerosene, and the present invention can be applied to various tank trucks equipped with tanks for loading liquids. .

In the embodiment described above, the pump 6 is driven by the output of the engine 2 which is the driving source for driving, but the pump 6 may be driven by an engine or an electric motor other than the engine 2 which is the driving source for driving.

Further, in the above embodiment, the spiral pump 6 is used as a mechanism for discharging the liquid in the tank 5 or sucking the liquid into the tank 5, but various types such as a diaphragm type, gear type, vane type, etc. It may also be a pump.

Further, in the above embodiment, the pipes are used both for water absorption and water discharge, but the tank 5 may be provided with pipes dedicated to water absorption and water discharge, respectively.

Further, in the above embodiment, a four-way valve is used, but a three-way valve, a five-way valve or more switching valve may be used.

Further, in the above embodiment, the second on-off valve 26 and the third on-off valve 30 are opened and closed by the control unit S, but they may be opened and closed manually.

Further, in the embodiment described above, the pump 6 provided in the vehicle sucks in and discharges the liquid, but it is also possible to suck in and discharge the liquid by using another pump 6 not provided in the vehicle. Alternatively, the pump may be omitted and the liquid in the tank may be discharged by its own weight.

1... Water truck, 2... Engine, 3... Cab, 4... Frame, 5... Tank, 5A... Discharge port, 5B... Priming port, 6... Pump, 6A, 6B... Piping, 7... Front water nozzle, 8... Rear water discharge nozzle, 9...Switching valve (4-way valve), 9A...1st port, 9B...2nd port, 9C...3rd port, 9D...4th port, 10...priming chamber, 11...full water Sensor, 12... First tank piping, 13... Priming water piping, 14... Tank valve (fifth on-off valve), 15... Priming valve (fourth on-off valve), 16... Merging piping, 17... Second tank piping, 18... Rear water discharge valve (sixth opening/closing valve), 19, 20... Branch pipe, 21... Manual operation valve, 22... Relief valve, 23... Piping (merging pipe), 24, 25... Branch pipe, 26... Front water discharge Valve (second on-off valve), 27, 28... Branch pipe, 29... Manual operation valve, 30... Water intake valve (third on-off valve), 31... Water tank (storage part), 32... Strainer, 33... Water discharge Piping, 34... Water discharge port, 35... Water discharge valve, 36... Water discharge button, 37... Front side operation switch, 38... Rear side operation switch, 39... Priming button, 40... Suction button, R1... First flow path, R2...Second channel, R3...Third channel, R4...Fourth channel, R5...Fifth channel, S...Control unit, W...Water

Claims (7)

A tank car equipped with a tank for loading liquid,
a first channel for discharging the liquid in the tank or sucking the liquid into the tank;
a second flow path that guides the liquid from the first flow path to a discharge section that discharges the liquid;
a third flow path that sucks liquid stored in a storage section separate from the tank;
a switching valve to which the first flow path, the second flow path, and the third flow path are connected;
The first channel and the second channel communicate with each other so that the liquid in the tank moves to the discharge section, and the third channel communicates with each other so that the liquid in the storage section moves to the tank. a control unit that switches the switching valve to a state where the flow path and the first flow path communicate,
A second on-off valve that can be opened and closed is provided in the second flow path, and a third on-off valve that can be opened and closed is provided in the third flow path ,
When the control unit receives a suction command signal to suck liquid into the tank, the control unit closes the second on-off valve and then connects the third flow path and the first flow path. A tank car characterized in that the switching valve is operated to switch so as to perform a switching operation . The second flow path is composed of a pipe connected to the switching valve and one branch pipe of two branch pipes branched at a downstream end of the pipe,
The third flow path is composed of the piping and the other branch piping of the two branch pipings,
The tank car according to claim 1 , wherein the second on-off valve is provided on the one branch pipe, and the third on-off valve is provided on the other branch pipe . When the control unit receives a discharge command signal for discharging the liquid in the tank to the discharge unit, the control unit closes the third on-off valve, and then closes the third on-off valve and then closes the third on-off valve. The tank car according to claim 1 or 2, wherein the switching valve is operated to switch so that the tank car communicates with the road. The tank includes a priming liquid storage section for supplying a liquid as a priming liquid to the third flow path, and the first flow path supplies the liquid from the priming liquid storage section to the third flow path. a fourth flow path for sucking liquid into the tank by supplying the liquid to the priming liquid storage section or sucking the liquid into the priming liquid storage section; and a fourth flow path that joins the fourth flow path on the downstream side and is provided in the tank a fifth channel for discharging the liquid in the tank from the discharge port, a fourth on-off valve that can be opened and closed in the fourth channel, and a fourth on-off valve that can be opened and closed in the fifth channel; A fifth on-off valve is provided, and the control unit closes the second on-off valve and the fifth on-off valve when receiving a suction command signal to suck liquid into the tank, and then closes the third on-off valve. The switching valve is switched so that the flow path and the fourth flow path communicate with each other, and the third on-off valve and the fourth on-off valve are opened. The tank car described in any one of the above. When the control unit receives a discharge command signal to discharge the liquid in the tank to the discharge unit, the control unit closes the third on-off valve and the fourth on-off valve, and then closes the third on-off valve and the fifth flow path. 5. The tank car according to claim 4, wherein the switching valve is operated to communicate with the second flow path. The control unit includes an operation switch that opens and closes the second on-off valve, and the control unit performs the operation when receiving a discharge command signal for discharging the liquid in the tank to the discharge unit and a switching completion signal of the switching valve. The tank car according to any one of claims 1 to 5, wherein the tank car is controlled so that the second on-off valve can be opened and closed by a switch. The controller includes an operation switch that opens and closes the second on-off valve, and the control unit controls the operation switch to open and close the second on-off valve when receiving a suction command signal to suck liquid into the tank. The tank car according to any one of claims 1 to 5, characterized in that the tank car is controlled to be ignored.