JP2010030622A - Vapor recovery system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vapor recovery system capable of preventing a liquid oil from being sucked into a vapor recovery pump even if a large quantity of the liquid oil is sucked in a vapor suction line. <P>SOLUTION: A vapor suction passage 34 on the suction side of the vapor recovery pump 37 is provided with a liquid oil suction preventing mechanism 40 that has a liquid oil storage chamber 42 capable of temporarily storing the liquid oil sucked in the vapor suction line 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vapor recovery system that recovers vapor generated in a tank when oil is replenished using an oil supply nozzle so as not to leak out from an oil supply port to the outside of the tank.

  In a refueling device installed at a gas station or the like that replenishes oil to the fuel tank of a vehicle, this occurred in the tank when refueling using a refueling nozzle from the safety and environmental perspectives. There is an increasing demand for an oil supply device equipped with a vapor recovery system for recovering vapor (oil vapor) from the oil supply port so as not to leak out of the tank.

  Normally, the vapor recovery system recovers vapor generated in the tank when the oil liquid is replenished by using the oil supply nozzle at or near the discharge pipe of the oil supply nozzle inserted into the oil supply port to be refueled. Therefore, the opening (suction port) on one end side of the vapor suction line is faced, and the atmosphere around the discharge pipe is sucked through the vapor suction line by the operation of the vapor recovery pump provided on the other end side of the vapor suction line. The vapor contained in the suction atmosphere is collected in the oil storage tank.

  In the vapor recovery system having such a configuration, a filter for removing foreign matters such as dust contained in the atmosphere sucked through the vapor suction line is provided on the suction side of the vapor recovery pump. Yes.

JP-A-6-342999

  By the way, in the case of the vapor recovery system of the oil supply device from the above-described configuration, even if the oil liquid is sucked from the opening (suction port) on one end side of the vapor suction line, the sucked oil liquid is A small amount can be removed with a filter, and the sucked oil liquid does not reach the suction side of the vapor recovery pump.

  However, due to the diversification of vehicle tank placement positions of recent fuel tanks and the complicated shape of the extension of the introduction pipe extending from the fuel filler port to the fuel tank, the oil liquid such as gasoline is replenished depending on the vehicle type. During the process, the number of vehicles in which the liquid level in the fuel filler port suddenly rises tends to increase.

  In such a refueling operation for a vehicle, there is an automatic refueling stop function provided in a refueling nozzle that automatically stops the discharge of oil liquid by detecting that the liquid level has reached the tip of a discharge pipe inserted into a refueling port. Even if it operates, the liquid level tends to reach the vicinity of the opening end of the upper surface in the fuel filler port.

  In the case of a so-called full-service gas station where the gas station workers perform refueling work, the type of vehicle in which the liquid level in the fuel filler port of the fuel tank rises rapidly is known in advance among the gas station workers. Although the oil can be replenished while adjusting the operation of the oiling nozzle so that the oil is not sucked into the vapor suction line, the customer himself can perform the refueling work under the direction of the gas station administrator. In service-type gas stations, attention is often not paid to such a rapid rise in the liquid level in the fuel filler port.

  For this reason, as the refueling operation is performed, the opportunity for sucking the oil into the vapor suction line and the amount of the sucked oil are increasing.

  As a result, the oil liquid that has been sucked into the vapor suction line during the refueling operation can reach the vapor recovery pump, which could be removed with a filter, and the vapor recovery pump and thus the vapor recovery system. It was the cause of failure.

  The present invention has been made in consideration of such problems, and even if a large amount of oil is sucked into the vapor suction line, the oil is not allowed to enter the vapor recovery pump. An object of the present invention is to provide a vapor recovery system capable of preventing suction.

  In addition, the present invention further provides a vapor recovery system that allows a large amount of oil liquid sucked into the vapor suction line to be safely and reliably discharged from the vapor suction line before reaching the vapor recovery pump. The purpose is to do.

  In order to solve the above-described problems, the present invention provides a space component (chamber) that can temporarily store the oil liquid sucked into the vapor suction line in the vapor suction path on the suction side of the vapor recovery pump. ) Is installed.

  Further, the present invention is characterized in that the chamber is provided with a discharge mechanism for automatically returning the stored oil liquid to the suction side of the pump.

  According to the present invention, the chamber for temporarily storing the oil liquid sucked into the vapor suction line is disposed in the vapor suction line on the suction side of the vapor recovery pump, so that the oil liquid into the vapor recovery pump can be obtained. Suction can be prevented, and the failure of the vapor recovery pump and hence the vapor recovery system can be reduced.

  Further, according to the present invention, the chamber is provided with a discharge mechanism for automatically returning the stored oil liquid to the suction side of the pump, so that a large amount of oil liquid is sucked into the chamber. However, the reliability of preventing the oil liquid from being sucked into the vapor recovery pump is improved, and the stored oil liquid is automatically returned to the suction side of the pump, so that the performance can be improved in terms of safety and environment.

A vapor recovery system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of an example of a fueling apparatus to which a vapor recovery system according to an embodiment of the present invention is applied.

  The oil supply device 1 is led out from the device main body 2 and includes an oil supply nozzle 3 at the tip, and an oil supply hose 5 with a safety joint 4 interposed in the middle. The base end of the oil supply hose 5 is connected to the outflow side of the flow meter 6 provided in the apparatus main body 2 via a pipe or the like in order to measure the amount of oil supplied from the oil supply nozzle 3 to the tank to be supplied with oil. ing. A flow rate pulse transmitter 7 that outputs a flow rate pulse signal corresponding to each unit flow rate is attached to the flow meter 6. The inflow side of the flow meter 6 is also provided in the apparatus main body 2 and communicates with the discharge side of the pump 8 that supplies oil to the oil supply nozzle 3 by the operation of the pump drive motor 9. The suction side of the pump 8 communicates with an underground tank (oil storage tank) (not shown) via a pipe. The pump 8 pumps up an oil liquid of a predetermined oil type stored in the underground tank and supplies it to the oil supply nozzle 3. To do.

  The wall surface of the apparatus main body 2 is provided with a nozzle hook (nozzle storage portion) 11 for storing the fuel supply nozzle 3 during standby when the fuel supply operation is not performed. The nozzle hook 11 is provided with a nozzle switch 12 for detecting the storage state / non-storage state of the fuel supply nozzle 3 with respect to the nozzle hook 11. The detection signal of the storage state / non-storage state of the fuel supply nozzle 3 by the nozzle switch 12 is supplied to the fuel supply control device 20.

  The oil supply control device 20 controls the drive / stop of the pump drive motor 9 based on the non-accommodated / accommodated state detection signal output from the nozzle switch 11 to supply / supply oil to the oil supply nozzle 3. Control the stop. Further, the oil supply control device 20 calculates the oil supply amount based on the flow rate pulse signal output from the flow rate pulse transmitter 7 at the time of performing the oil supply operation using the oil supply nozzle 3, and the calculated oil supply The oil supply data including the amount is displayed and controlled on an oil supply amount display (not shown). Further, the fuel supply control device 20 also functions as a vapor recovery control device, and drives / stops the vapor recovery pump 37 of the vapor recovery system 30 in accordance with the non-storage state / storage state detection signal output from the nozzle switch 11. Also comes to control.

  Next, an embodiment of the vapor recovery system 30 provided corresponding to each oil supply system 21 provided with the oil supply nozzle 3 and the oil supply hose 5 of the oil supply device 1 will be described.

  At the base end side portion of the discharge pipe 3b extending from the nozzle body 3a of the oil supply nozzle 3, which is inserted into the oil supply target oil supply port, the front end side of the discharge pipe 3b is inserted into the oil supply target oil supply port. A lid (so-called vapor collector) 31 is provided so as to cover the opening. The lid member 31 prevents splashing of the oil liquid bounced from the fuel filler port and leakage to the outside of the vapor as the fueling operation is performed.

  In the oil supply hose 5, a vapor suction line 32 as a vapor collection passage is extended in the length direction of the oil supply hose 5 so as to be integrated with the oil supply hose 5 independently of the oil liquid passage. Yes. The front end side of the vapor suction line 32 reaches the lid member 31 portion of the discharge pipe 3b through the nozzle body 3a, and opens to the lid member 31 or the discharge pipe 3b portion on the cylinder tip side in the vicinity thereof. The opening on the front end side of the vapor suction line 32 faces the inside of the oil supply port in a state where the discharge pipe 3b is inserted into the oil supply port and the oil supply port is covered with the lid member 31. Further, a vapor suction valve 33 that opens upon receiving the hydraulic pressure of the oil supplied to the oil supply nozzle 3 by driving the pump 8 is provided in the nozzle main body 3a of the vapor suction line 32, for example. The vapor suction valve 33 communicates / blocks the vapor suction line 32 in response to the refueling operation being performed / standby (not being performed), and the atmosphere around the discharge pipe 3b portion from the front end side opening of the vapor suction line 32 Allow / stop the suction.

  On the other hand, the base end side of the vapor suction line 32 is led out from the base end side of the oil supply hose 5 and communicates with the inlet side of the filter 35 through the connection passage 34. The filter 35 removes dust and the like contained in the atmosphere sucked from the opening on the front end side of the vapor suction line 32, and prevents the vapor collection pump 37 from sucking inappropriate foreign matters other than the vapor. The outlet side of the filter 35 is communicated with the suction side of the vapor recovery pump 37 via the suction passage 36, and the discharge side of the vapor recovery pump 37 is connected via the return passage 38 with the suction side of the pump 8 described above via a pipe. It communicates with the gas phase of an unillustrated underground tank (oil storage tank) that is communicated with each other.

  In the vapor recovery system 30 of the present embodiment applied to the oil supply apparatus 1 having the above-described configuration, the oil liquid sucked into the vapor suction line 32 is temporarily stored in the chamber, and the vapor is collected. An oil liquid suction preventing mechanism 40 that prevents the recovery pump 37 from sucking oil liquid is provided.

  The oil liquid suction preventing mechanism 40 is disposed in a connection passage 34 portion where the base end side of the vapor suction line 32 communicates with the inlet side of the filter 35, and the oil liquid sucked into the vapor suction line 32 during the oil supply operation. It has the structure which has the chamber 42 which stores temporarily.

FIG. 2 is a configuration diagram of an oil liquid suction preventing mechanism provided in the vapor recovery system.
In the illustrated example, the oil liquid suction prevention mechanism 40 includes an oil liquid storage chamber 42 and a valve mechanism storage chamber 43 that are defined in a vertical direction in a casing 41. A vapor suction side connection port 42 a and a vapor discharge side connection port 42 b are formed at the upper position of the oil liquid storage chamber 42. The vapor suction side connection 42a is connected to the upstream side connection pipe portion 34a of the connection pipe 34 shown in FIG. 1 connected to the base end side of the vapor suction line 32 via the joint 44, and the vapor discharge side connection port 42b. Is connected to the downstream connection piping part 34 b connected to the suction side of the vapor recovery pump 37 via a joint 44. The chamber suction surfaces of the vapor suction side connection port 42a and the vapor discharge side connection port 42b are opened downward, for example, on the ceiling surface of the oil storage chamber 42 so as not to face each other. As a result, the oil liquid accidentally sucked through the vapor suction line 32 is prevented from flowing directly from the vapor suction side connection port 42a into the vapor discharge side connection port 42b, and once into the oil liquid storage chamber 42. It is configured to be stored.

  The oil liquid storage chamber 42 and the valve mechanism storage chamber 43 that are defined with each other are communicated by a valve passage 45. An opening edge of the valve passage 45 on the valve mechanism storage chamber 43 side is a valve seat portion 47 on which a valve body 46 stored in the valve mechanism storage chamber 43 is seated. The valve body 46 is connected to a diaphragm 49 that defines the valve mechanism housing chamber 43 into a discharge chamber 43 a and a hydraulic chamber 43 b, and the valve shaft portion is connected to the flexible displacement of the diaphragm 49, so that the valve seat 47 It is held in the discharge chamber 43a so as to be separable from the seat. The valve body 46 is provided with an urging means 48 constituted by, for example, a coil spring that constantly urges the valve body 46 in a direction in which the valve body 46 is separated from the valve seat portion 47.

  In the valve mechanism storage chamber 43, an oil liquid discharge port 50 is opened in a discharge chamber 43a defined by a diaphragm 49, and a hydraulic pressure introduction port 51 is opened in a hydraulic pressure chamber 43b. A return pipe 52 is connected to the oil discharge port 50 via a joint 44, and the hydraulic chamber 43 b is communicated with the underground tank by the return pipe 52. In the illustrated example, the return pipe 52 communicates with a return passage 38 that communicates with an underground tank in the apparatus main body 2 as shown in FIG. In the valve mechanism storage chamber 43, a hydraulic pressure inlet 50 is opened in the hydraulic chamber 43 defined by the diaphragm 49. A hydraulic pressure introduction pipe 53 is connected to the hydraulic pressure introduction port 50 via a joint 44, and is communicated with the liquid passage on the discharge side of the pump 8 by this hydraulic pressure introduction pipe 53. In the illustrated example, the hydraulic pressure introduction pipe 53 communicates with an oil liquid passage for communicating between the discharge side of the pump 8 and the inflow side of the flow meter 6 in the apparatus main body 2. As a result, during the driving of the pump 8, the discharge pressure of the oil discharged from the pump 8 acts on the hydraulic pressure chamber 43 b via the hydraulic pressure introduction port 50, and the pump 8 is being driven while the pump 8 is stopped. A liquid pressure lower than the discharge pressure of the liquid acting on the pressure (for example, a valve opening pressure of a relief valve provided in a relief passage that connects the discharge side and the suction side of the pump 8 not shown) acts. ing.

  Accordingly, the urging force of the urging means 48 that constantly urges the valve body 46 away from the valve seat portion 47 is such that the oil liquid discharged from the pump 8 acts on the diaphragm 49 while the pump 8 is driven. The pressure is set in advance so that the oil pressure on the discharge side of the pump 8 is larger than the pressure acting on the diaphragm 49 while the pump 8 is stopped.

  As a result, when the hydraulic pressure on the discharge side of the pump 8 is acting on the diaphragm 49 during the operation of the pump 8, the diaphragm 49 resists the urging force of the urging means 48 so that the valve body 46 is moved to the valve seat 46. As shown in FIG. 2, the fluid displacement chamber 42 and the discharge chamber 43 a of the valve mechanism storage chamber 43 are disconnected from each other. Further, when the hydraulic pressure on the discharge side of the pump 8 is acting on the diaphragm 49 while the pump 8 is stopped, the diaphragm 49 separates the valve body 46 from the valve seat portion 47 by the urging force of the urging means 48. As shown in FIG. 3, the fluid displacement chamber 42 and the discharge mechanism 43a of the valve mechanism storage chamber 43 are in communication with each other.

  Each component configuration including the valve mechanism storage chamber 43 added to the valve mechanism storage chamber 43 constitutes a return valve mechanism for returning the oil stored in the oil storage chamber 42 to the underground tank. To do.

FIG. 3 is a diagram showing another state that is a pair of states of the oil liquid suction preventing mechanism shown in FIG.
Next, the operation of the fueling apparatus 1 to which the vapor recovery system 30 of the present embodiment configured as described above is applied will be described.

  For example, in a self-service fueling station, when an operator performs a refueling operation using the refueling device 1, a worker operates a refueling work terminal (not shown) to perform a necessary refueling operation using the refueling device 1. Enter the condition. When the refueling operation conditions using the refueling device 1 are properly input, a refueling operation start permission is supplied from the refueling work terminal to the refueling control device 20 of the refueling device 1 via a communication line (not shown). Thus, the oil supply device 1 can be operated based on the operation of the oil supply nozzle 3.

  Then, when the operator takes out the fuel supply nozzle 3 from the nozzle housing portion 11 to perform the fuel supply operation, and the detection signal of the non-storage state is supplied from the nozzle switch 12 to the fuel supply control device 20, the fuel supply control device 20 The pump drive motor 9 is activated to drive the pump 8 and the vapor recovery pump 37 of the vapor recovery system 30 is also driven.

  Therefore, the operator can insert the discharge pipe 3b of the fueling nozzle 3 into the fueling port to be lubricated, and the valve mechanism in the nozzle body 3a can be operated by opening the operation lever provided in the nozzle body 3a. By opening the valve 9 and driving the pump drive motor 9, the oil supplied from the pump 8 to the oil supply nozzle 3 can be replenished from the discharge pipe 3b to the oil supply target.

  When the oil is supplied from the pump 8 to the oil supply nozzle 3 by driving the pump drive motor 9, the oil supply nozzle 3 has a nozzle body 3 a in the nozzle body 3 a regardless of the valve opening operation. The discharge pressure of the oil discharged from the pump 8 acts on the oil passage on the discharge side of the pump 8 including the oil supply hose 5 upstream of the valve mechanism.

  As a result, the vapor suction valve 33 that operates by receiving the hydraulic pressure of the oil supplied to the oil supply nozzle 3 by driving the pump 8 in the vapor suction line 32 is opened, and the vapor suction line 32 communicates with the vapor. The suction of the atmosphere around the discharge pipe 3b portion from the opening on the front end side of the vapor suction line 32 by the drive of the recovery pump 37 is started together with the removal from the nozzle storage portion 11 of the fuel supply nozzle 3.

  At this time, the liquid suction preventing mechanism 40 communicated with the vapor suction line 32 is configured so that the internal pressure of the hydraulic pressure chamber 43 b of the valve mechanism housing chamber 43 is also the hydraulic pressure on the discharge side of the pump 8 that is operating via the hydraulic pressure introducing pipe 53. It has become. Thereby, the diaphragm 49 is in a state where the hydraulic pressure on the discharge side of the pump 8 in operation is acting, and is in the state shown in FIG. That is, the diaphragm 49 is flexibly displaced so that the valve body 46 is seated on the valve seat portion 47 against the urging force of the urging means 48, and the oil liquid storage chamber 42 and the discharge chambers of the valve mechanism storage chamber 43. 43a is in a disconnected state. Therefore, the vapor recovery pump 37 can exclusively suck the atmosphere around the front end side opening of the vapor suction line 32 from the vapor suction side connection port 42a through the oil / liquid storage chamber 42 of the liquid suction prevention mechanism 40. It is ready for use. As a result, the suction performance of the vapor recovery pump 37 can be fully utilized for the suction of the atmosphere around the tip side opening of the vapor suction line 32 without impairing the suction capability of the vapor recovery pump 37.

  The operator inserts the discharge pipe 3b of the fueling nozzle 3 into the fueling port to be lubricated, and opens the operation lever of the nozzle body 3a to replenish the fluid to be lubricated. As the refueling progresses, the vapor that tends to overflow to the outside from the refueling target is sucked back by the vapor recovery pump 37 via the vapor suction line 32, the oil liquid suction preventing mechanism 40, and the filter 35. It returns to the gas phase of the underground tank via the passage 38. Thereby, it is possible to prevent the vapor overflowing from the oil supply target to be refueled from leaking to the outside along with the replenishment operation of the oil liquid.

  After that, when the liquid level reaches the tip of the discharge pipe inserted into the filler port, the automatic lubrication stop function provided in the filler nozzle detects this and automatically closes the valve mechanism in the nozzle body 3a. The so-called full tank refueling can be safely terminated without the operator's operation of closing the operation lever of the fuel supply nozzle 3.

  At that time, even if the automatic refueling stop function is activated, if the liquid level reaches the vicinity of the open end of the upper surface in the oil filler port, the oil is sucked into the vapor suction line 32 from the front end side opening. There is a time to end.

  Even in such a case, when the oil sucked into the vapor suction line 32 flows into the oil sucking prevention mechanism 40 located on the upstream side with respect to the filter 35 and the vapor recovery pump 37, the vapor suction is performed. At the stage of flowing into the oil liquid storage chamber 42 from the side connection port 42a, the oil liquid and the vapor are separated, and the oil liquid is temporarily stored in the oil liquid storage chamber 42. Therefore, the oil liquid sucked into the vapor suction line 32 does not reach the downstream filter 35 and the vapor recovery pump 37 from the vapor discharge side connection port 42 b of the oil liquid storage chamber 42. Thereby, the suction of the oil liquid into the vapor recovery pump 37 can be prevented, and the failure of the vapor recovery pump 37 and the vapor recovery system 30 can be reduced.

  On the other hand, when the operator who has finished the refueling operation closes the operation lever and then stores the refueling nozzle 3 back in the nozzle storage portion 11, the oil supply control is performed from the nozzle switch 12 attached to the nozzle storage portion 11. The device 20 is supplied with a detection signal of the storage state. The oil supply control device 20 stops the pump drive motor 9 by stopping the pump drive motor 9 and stops driving the vapor collection pump 37 of the vapor collection system 30 in response to the input of the storage state detection signal. The refueling control device 20 transmits refueling result information such as the refueling amount associated with the current refueling work to a refueling work terminal (not shown) via a communication line, and then waits for the next refueling work. It becomes a state.

  In the vapor recovery system 30 of the present embodiment, when the pump 8 is in a standby state where the driving is stopped, the oil liquid stored in the oil liquid storage chamber 42 of the oil liquid suction preventing mechanism 40 by the immediately preceding oil supply operation is The oil is automatically discharged from the oil storage chamber 42 and returned to the underground tank via the return pipe 52 without passing through the vapor recovery pump 37. The operation of the oil liquid suction preventing mechanism 40 in this case is as follows.

  That is, when the driving of the pump 8 is stopped, the hydraulic fluid suction preventing mechanism 40 causes the hydraulic pressure on the discharge side of the pump 8 during operation to not act on the hydraulic pressure chamber 43b of the valve mechanism storage chamber 43, and the internal pressure of the hydraulic pressure chamber 43b. Is lower than when the pump 8 is driven. As a result, the fluid pressure on the discharge side of the pump 8 in operation does not act on the diaphragm 49, and the state shown in FIG. 2 is changed to the state shown in FIG. That is, the diaphragm 49 is flexibly displaced by the urging force of the urging means 48 so that the valve body 46 is separated from the valve seat portion 47, and the oil liquid storage chamber 42 and the valve mechanism storage chamber 43 are discharged. Communication with the chamber 43a is established. Therefore, the oil liquid stored in the oil liquid storage chamber 42 in the immediately preceding oil supply operation is underground through the return pipe 52 from the vapor discharge side connection port 42b through the discharge chamber 43a in a communicating state. Returned to the tank.

  Therefore, according to the vapor recovery system 30 of the present embodiment, the error on the discharge side of the pump 8 that is driven / stopped in accordance with the operating state of the fueling device (the state of oiling work) / standby state (the state of non-oiling work). Since the change in atmospheric pressure is used to open and close the valve body 46 that communicates / blocks between the oil liquid storage chamber 42 of the oil liquid suction prevention mechanism 40 and the discharge chamber 43a of the valve mechanism storage chamber 43. Every time the refueling operation is completed, the oil stored in the oil storage chamber 42 in the immediately preceding refueling operation is automatically discharged to the underground tank via the return pipe 52. As a result, even if a large amount of oil liquid is sucked into the oil liquid storage chamber 42 via the vapor suction line 32 in one oil supply operation, the oil liquid storage chamber 42 is not used for the start of the next oil supply operation. Therefore, it is possible to more reliably prevent the oil liquid from being sucked into the vapor recovery pump 37.

  As described above, the vapor recovery system 30 of the present embodiment is configured, but various changes can be made to the specific configuration of each part.

  For example, in the configuration of the oil / liquid suction prevention mechanism 40 shown in FIGS. 1 and 2, the introduction of the hydraulic pressure on the discharge side of the pump 8 into the hydraulic chamber 43b is abolished, and the hydraulic chamber 43b is kept in a constant pressure state ( For example, instead of the urging means 48 for urging the valve body 46 against the valve seat portion 47 in the separation direction while maintaining the atmospheric pressure state), the valve body 46 is separated from the valve seat portion 47 in the separation direction. Even if an urging means 46 ′ (not shown) for urging the diaphragm 49 is provided in the hydraulic pressure chamber 43 b or a large amount of oil is sucked in through the vapor suction line 32 in the oil supply operation, the oil liquid The oil liquid temporarily stored in the storage chamber 42 and stored in the oil liquid storage chamber 42 can be automatically discharged to the underground tank.

  In this case, the relationship between the urging force of the urging means 46 ′ that urges the diaphragm 49 in the seating direction of the valve body 46 with respect to the valve seat 47 is temporarily stored in the oil liquid storage chamber 42. Set with. That is, when only a small amount of oil is acting on the diaphragm 49, the valve body 46 is against the weight of the small amount of oil acting on the diaphragm 49 by the urging force of the urging means 46 '. When the valve is closed, the amount of the oil liquid temporarily stored in the oil liquid storage chamber 42 becomes a predetermined amount, and the weight of the oil liquid acting on the diaphragm 49 becomes a predetermined amount, the urging force of the urging means 46 'is resisted. Thus, the valve body 46 is opened.

  According to such a configuration of the oil liquid suction preventing mechanism 40, the oil liquid exceeding a predetermined amount stored in the oil liquid storage chamber 42 is automatically discharged to the underground tank at any time. It is possible to prevent the oil liquid from being sucked into the inside.

  Further, the vapor recovery system according to the embodiment of the present invention can also be applied to a vapor recovery system in which a vapor recovery pump 37 is shared for each of the vapor suction lines 32 provided corresponding to the plurality of oil supply systems 21. It is.

1 is an external view of a fueling device to which a vapor recovery system according to an embodiment of the present invention is applied. It is a block diagram of one Example of the oil-liquid suction prevention mechanism provided in the vapor collection system. It is the figure which showed another state used as a pair of the state of the oil-liquid suction prevention mechanism shown in FIG.

Explanation of symbols

1 Oiling device, 2 Device body, 3 Oiling nozzle, 3a Nozzle body,
3b Discharge pipe, 4 Safety joint, 5 Oil hose, 6 Flow meter,
7 Flow rate pulse generator, 8 pump, 9 pump drive motor,
11 Nozzle hook (nozzle storage), 12 Nozzle switch,
20 oil supply control device, 21 oil supply system, 30 vapor recovery system,
31 lid material, 32 vapor suction line, 33 vapor suction valve,
34 connection passage, 34a upstream connection piping section, 34b downstream connection piping section,
35 filter, 36 suction passage, 37 vapor recovery pump,
38 return passage, 40 oil liquid suction prevention mechanism, 41 housing,
42 oil storage chamber, 42a vapor suction side connection port,
42b vapor discharge side connection port, 43 valve mechanism storage chamber, 43a discharge chamber,
43b Hydraulic chamber, 44 joint, 45 valve passage, 46 valve body, 47 valve seat,
48 urging means, 49 diaphragm, 50 oil discharge port, 51 hydraulic pressure inlet,
52 return piping, 53 hydraulic pressure introduction piping

Claims (2)

A vapor suction line for sucking the vapor generated on the oil supply nozzle side from the opening on the tip side;
A vapor recovery system comprising a vapor recovery pump in which a base end side and a suction side of the vapor suction line communicate with each other, and recovers the vapor generated on the oil supply nozzle side during refueling work,
Oil that temporarily stores oil that has been sucked into the vapor suction line from the opening on the distal end side in a connection passage that connects the proximal end side of the vapor suction line and the suction side of the vapor recovery pump A vapor recovery system characterized in that an oil liquid suction prevention mechanism including a liquid storage chamber is disposed so that the sucked oil liquid does not reach the vapor recovery pump.   The oil liquid suction prevention mechanism includes a return valve mechanism that communicates / blocks the oil liquid storage chamber with respect to a return flow path for returning the oil liquid storage chamber to the oil storage tank that stores the oil liquid supplied to the oil supply nozzle. The vapor recovery system according to claim 1.

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