JP4288508B2 - Internal pressure explosion-proof terminal - Google Patents

Description

  The present invention relates to an internal pressure explosion-proof terminal installed in a place where flammable gas drifts in a gas filling station such as LP gas, hydrogen gas, and natural gas.

Since gases such as LP gas, hydrogen gas, and natural gas are highly flammable and dangerous, internal pressure explosion-proof types are used for terminals installed in places where these gases are handled.
The internal pressure explosion-proof terminal is a device in which air in a non-hazardous area is sent into the housing of the terminal to increase the pressure in the housing so that surrounding combustible gas does not flow into the housing.

In order to reduce the running cost of such an internal pressure explosion-proof terminal, the housing is made airtight to reduce the amount of air leakage, but the air from the card reader's card insertion port and the printer's slip discharge port is reduced. The amount of leakage is large.
The present applicant has proposed a terminal that sends air into the housing only when issuing a slip, stops air supply after issuing the slip, and suppresses running costs (Patent Document 1). Although this is effective, it is not effective in a terminal that is frequently used, and the card reader is provided with a hand scan type explosion-proof structure outside the terminal.

A hand-scan type card reader is prone to read errors depending on the scanning speed, and is provided outside the housing, so that it is deteriorated by dust and raindrops, and reading errors are likely to occur.
JP-A-6-100098

  The present invention has been made in view of the above, and an object of the present invention is to provide an internal pressure explosion-proof terminal that can reduce the amount of air leakage as much as possible and keep running costs low.

  The present invention relates to an internal pressure explosion-proof terminal (1) in which air sent from a non-hazardous area is introduced into the housing (2) and the pressure in the housing (2) is increased to form an explosion-proof structure. 2) A card reader main body (13) is provided in the inside, a card insertion opening (18) is provided in the housing (2) on the front surface of the card reader main body (13), and a card guide (21) is provided in the card insertion opening (18). An airtight holding means (20) constituted by a hollow packing (22) is provided, the card guide (21) is fixed to the lower plate (24), and the hollow packing (22) is formed with a cylindrical hollow portion (22a). It consists of a hook-shaped clamp part (22b), the hollow part (22a) faces the card guide (21), the clamp part (22b) is fixed to the upper plate (25), and the lower plate (24) is a housing ( 2) fixed and above (25) is attached to the lower plate (24) with an adjusting screw (27), and the upper plate (25) is airtightly and slidably attached to an upper plate insertion groove (28) provided in the housing (2). Yes.

(1) Since the air leakage is minimized by the airtight holding means, the running cost can be reduced.
(2) Since the card reader main body is provided in the housing of the terminal, the durability of the card reader is increased and reading errors are reduced.
(3) Since the pressing force to the card guide of the hollow packing can be adjusted with the adjusting screw, it is easy to ensure airtightness.
(4) A card is smoothly inserted by sticking a low friction film to the cylindrical hollow portion of the hollow packing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an internal pressure explosion-proof terminal. A housing 2 of the terminal 1 is made airtight, and a card reader 3, a printer 4, and a touch panel 5 are provided in the housing 2.

  The housing 2 is connected to a compressor 7 via a pipe 6, and a pressure reducing valve 8 is interposed in the pipe 6. The card reader 3, the printer 4, and the touch panel 5 are connected to a controller 9, and the controller 9 is connected to a control device 11 and a gas filling device 12 through a signal line 10.

  The compressor 7 and the control device 11 are provided in a safe place where no flammable gas exists.

FIG. 2 is a cross-sectional view of a portion of the card reader 3, and FIG. 3 is a perspective view of an airtight holding means of the card reader 3.
As shown in FIG. 2, the card reader body 13 of the card reader 3 is provided in the housing 2, the housing 2 on the front surface of the card reader body 13 is formed with a recess 14 inside, and the upper end of the recess 14 is pivotally supported 15. A lid 16 is provided.

An opening 17 is opened in the recess 14, the opening 17 is closed by a seal plate 19 having a card insertion slot 18, and an airtight holding means 20 is provided inside the card insertion slot 18.
As shown in FIG. 3, the airtight holding means 20 includes a card guide 21 and a hollow packing 22.

  The card guide 21 is made of a resin that is slippery. The width H1 is 40 mm to 50 mm longer than the width H2 of the card 23 in order to keep the seal at both ends of the inserted card 23, and the width H3 is 15 mm to prevent the card 23 from warping. 30 mm. The card guide 21 is fixed to the lower plate 24.

  The hollow packing 22 is made of a flexible resin or rubber, and includes a cylindrical hollow portion 22a and a hook-shaped clamp portion 22b. The hollow portion 22a faces the card guide 21, and an upper plate 25 is provided on the clamp portion 22b. Has been inserted. The clamp portion 22b is formed with teeth 22c facing inward so as not to be detached from the upper plate 25.

Similar to the card guide 21, the hollow packing 22 has a width that is 40 mm to 50 mm longer than the width of the card 23 in order to maintain the seal at both ends of the card 23 to be inserted.
A low friction film 26 is affixed to the hollow portion 22a to improve the sliding of the card 23 to be inserted. As this low friction film 26, an ultra-high molecular weight polyethylene film (Scotch Mark Ultra Tape manufactured by Sumitomo 3M Limited) can be suitably used.

The hollow portion 22a is kept in close contact with the card guide 21 and is kept airtight. When the card 23 is inserted, the hollow portion 22a is bent in close contact with the card 23 and kept airtight.
The upper plate 25 is attached to the lower plate 24 with screws 27. By adjusting the screws 27, the pressing force of the hollow portion 22a to the card guide 21 is adjusted, so that optimum airtightness can be secured.

The lower plate 24 of the airtight holding means 21 is fixed to the housing 2, and the upper plate 25 is airtightly and slidably inserted into an upper plate insertion groove 28 provided in the housing 2. The hollow portion 22a is in close contact with the seal plate 19 and is kept airtight.
FIG. 4 is a cross-sectional view of a portion of the printer 4. The printer main body 30 is provided in the housing 2. The housing 2 on the front surface of the printer main body 30 is formed with a concave portion 31 on the inner side. A lid 33 is provided.

A slip discharge port 34 is opened in the recess 31, and a slip guide 35 is provided inside the slip discharge port 34. The slip guide 35 is formed in a letter C shape, and the space at the narrow end of the tip is slightly higher than two slips. During standby, the tip of the next slip 36 to be printed is positioned slightly out of the slip discharge port 34, and the amount of air leaking from the slip discharge port 34 is kept small.
The printer main body 30 is provided with a roll-shaped slip 36, a printing machine 37, and a cutter 38.

The internal pressure explosion-proof terminal 1 configured in this way is installed in a place where there is a possibility that a combustible gas such as hydrogen gas or natural gas may drift. The air sent from the compressor 7 is reduced to an appropriate pressure by the pressure reducing valve 8 and flows into the housing 2 to keep the inside of the housing 2 at a predetermined pressure or higher, and there is no possibility that flammable gas flows into the housing 2. .
When the pressure in the housing 2 increases, air tends to flow out from the card insertion port 18 and the slip discharge port 34. The card insertion port 18 is hermetically sealed by the airtight holding means 20, and the slip discharge port 34 is sealed by the slip 36. Since it is sealed, the outflow of air is small.

  To read the card 23 with the card reader 3, the lid 16 is rotated upward and the card 23 is inserted from the card insertion slot 18. When the card 23 is pushed against the pressing force of the hollow packing 22 and the tip of the card 23 slightly enters the card reader main body 13, the card 23 is drawn into the card reader main body 23 and is discharged after reading.

  When discharged, the card 23 is sandwiched between the card guide 21 and the hollow packing 22 and does not fall down. Then, the card 23 is pulled out against the pressing force of the hollow packing 22 and the lid 16 is closed.

  When there is no card 23 in the card insertion slot 18, the hollow part 22a of the hollow packing 22 is in close contact with the card guide 21 to prevent air leakage. When the card 23 is in the card insertion slot 18, the hollow part 22a of the hollow packing 22 is provided. Is in close contact with the card 23, and the card 23 is in close contact with the card guide 21 to prevent air leakage.

  The card data read by the card reader 3 is sent to the control device 11 via the controller 9. Then, desired gas filling data is input on the touch panel 5, gas is filled into the automobile by the gas filling device 12, and the filling data is printed on a slip by the printer 4.

  As shown in FIG. 4, the slip discharge port 34 of the waiting printer 4 is closed by the tip of the slip 36, and the amount of air leakage is suppressed. When printing is started by the printer 37, the slip 36 is gradually discharged from the slip discharge port 34, and when the printing is finished, the slip 36 is cut by the cutter 38.

  As shown in FIG. 5, the rear side of the slip 36 a remains inside the slip discharge port 34 with the current slip 36 a being cut. Then, the next slip 36b is sent, and stops at a position where the tip of the slip 36b slightly exits from the slip discharge port 34.

Thus, since the next slip 36b is sent to the slip discharge port 34 while the current slip 36a is present, the next slip 36b is guided to the current slip 36a and can move to the slip discharge port 34, so that the slip discharge is performed. There is no risk of slipping at the exit 34.
Then, the lid 33 is opened and the slip 36a is taken out. Since the next slip 36b closes the slip discharge port 34 when the slip 36a is taken out, the amount of air leakage is suppressed.

  Even if a card reader is incorporated in an internal pressure explosion-proof terminal, the amount of air leakage is small and the running cost can be kept low, so that the use of internal pressure explosion-proof terminals can be promoted.

Sectional drawing of the internal pressure explosion-proof terminal of this invention. Sectional drawing of the card reader part of an internal pressure explosion-proof terminal. The perspective view of the airtight holding means of a card reader. Sectional drawing of the printer part of the internal pressure explosion-proof terminal. Sectional drawing explaining operation | movement of a printer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Terminal device 2 ... Housing 3 ... Card reader 4 ... Printer 5 ... Touch panel 6 ... Piping 7 ... Compressor 8 ... Depressurizer 9 ... Controller 10. ..Signal line 11... Control device 12... Gas filling device 13... Card reader body 14 and 31... Recessed portion 15 and 32. Opening 18 ... Card insertion slot 19 ... Seal plate 20 ... Airtight holding means 21 ... Card guide 22 ... Hollow packing 22a ... Hollow part 22b ... Clamp part 22c ... Tooth 23 ... Card 24 ... Lower plate 25 ... Upper plate 26 ... Low friction film 27 ... Adjustment screw 28 ... Upper plate insertion groove 30 ... Printer body 34 ... Slip out Exit 35 ... slip guide 36 ...・ Voucher 37 ... Printer 38 ... Cutter

Claims (1)

In an internal pressure explosion-proof terminal that introduces air sent from a non-hazardous area into the housing and increases the pressure in the housing to make it an explosion-proof structure, a card reader body is provided in the housing, A card insertion opening is provided in the housing, and an airtight holding means composed of a card guide and a hollow packing is provided in the card insertion opening, the card guide is fixed to the lower plate, and the hollow packing has a cylindrical hollow portion and a hook shape. The clamp is fixed to the upper plate, the lower plate is fixed to the housing, the upper plate is attached to the lower plate with adjusting screws, and the upper plate is attached to the housing. An internal pressure explosion-proof terminal device that is airtight and slidably attached to an upper plate insertion groove provided.

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