JP2018132445A - Ventilation structure for microcomputer meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation structure for a microcomputer meter capable of preventing an illegal operation and also preventing foreign matter from entering.SOLUTION: An outer shell of a microcomputer meter consists of a plurality of casings such as a front cover 12 etc., and a control chamber 51 formed of electronic components is arranged on an inner side of the front cover 12, which is provided with an inner wall face 26 in which a terminal board 52 connected to the control chamber 51 is fitted. A ventilation groove 28 serving as an air flow passage is formed on the inner wall face 26, the ventilation groove 28 is provided with an air vent 32 communicating with the outside and an air vent 35 communicating an inner space such as the control chamber 51 etc., and a sealing body 31 covering the ventilation groove 28 entirely is stuck on the inner wall face 26. The sealing body 31 prevents foreign matter from entering from the ventilation groove 28 even if a terminal board lid 41 falls. Further, the sealing body 31 covers a fastening screw 53, and consequently it becomes difficult to remove the front cover 12 and illegal removal can be grasped thereafter from a trace left on the sealing body 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ventilation structure for a microcomputer meter incorporated in order to make an internal space coincide with atmospheric pressure.

  Gas meters are used to measure gas consumption for each consumer, such as homes and offices. In recent years, in addition to earthquakes, abnormalities in gas supply pressure and usage conditions are detected, and gas is automatically shut off. “Microcomputer meters” with built-in security functions are widely used and contribute to improving safety. In addition, the gas meter needs to ensure safety and fairness, and measures are taken to prevent unauthorized persons from operating the inside illegally.

  The microcomputer meter incorporates a pressure sensor that measures the gas supply pressure. Therefore, it is necessary to make the internal space coincide with the atmospheric pressure, and a vent hole that connects the inside and outside is provided. In order to prevent foreign matter such as rainwater from entering this vent, the location and size of the vent have been carefully examined. In severe conditions, such as storms, sudden temperature changes due to sunset after hot summer weather Will not cause any problems.

  The outer shell of the microcomputer meter has a structure in which a plurality of metal casings are combined. Specifically, it is divided into a main case that houses a diaphragm, etc., an upper case that houses a control room made up of electronic components, a front cover into which the liquid crystal panel is fitted, etc. The structure is sandwiched and sealed. And in order to avoid the arrival of rainwater, the vents are often arranged at the lower back of the front cover. A vent groove for guiding outside air to the internal space is provided at the back of the vent hole, and a vent hole leading to the internal space is provided at an upper portion of the vent groove. Since the ventilation groove extends generally upward, entry of foreign matter can be prevented.

  A terminal block is provided on the front face of the microcomputer meter so that an external device such as a gas leak alarm or a wireless communication device can be connected. The terminal block is fitted into the wall surface of the front cover, and the surface thereof is exposed to the outside. However, exposing the terminal block not only detracts from aesthetics but may also cause mischief, which is usually covered with a terminal block cover. It is desirable that the terminal block lid can be easily removed in consideration of work, and is often attached with screws.

  As for the ventilation structure of the microcomputer meter, technological development has been advanced so far, and an example thereof is Patent Document 1 described later. The gas meter (microcomputer meter) disclosed in this document has a structure in which a vent is provided in a cover body that covers an opening of a housing member, and the vent is covered with a cover portion. It is characterized by being fitted. By fitting the insect-proof cap, it is possible to prevent insects and the like from entering without reducing the opening, and both the air permeability and the insect-proof property are improved. Furthermore, when manufacturing this gas meter, the existing production equipment can be used as it is.

  Further, as an example of countermeasures against fraud of the microcomputer meter, Patent Document 2 described later can be cited. This document relates to a gas meter (microcomputer meter) that controls a shut-off valve with a magnetic switch, and discloses a protective cover device for a gas meter that prevents the shut-off valve from being controlled for an unauthorized purpose. This protective cover device is composed of a protective cover member for preventing the intrusion of a magnetic field and a means for preventing its removal, and the protective cover member is shaped so as to surround the upper casing of the gas meter, and a magnet or the like around the magnetic switch. Secure a space to prevent intrusion. The protective cover member is detachable from the upper casing, and is secured to the gas meter using a detachment prevention means such as a lock.

Japanese Utility Model Publication No. 4-41629 JP 2007-86019 A

  A ventilation groove for taking outside air into the internal space of the microcomputer meter is formed so as to cut the wall surface of the front cover. A terminal block is fitted into the wall surface, and when the terminal block cover is removed, the ventilation groove is also exposed to the outside, and there is a possibility that foreign matters such as rainwater and insects may enter from there. The terminal block lid can be removed with a normal screwdriver so that the wiring work can be carried out smoothly after the installation of the microcomputer meter. Problems such as removal due to mischief and loosening of screws are expected. Therefore, it is necessary to prevent intrusion of foreign matter from the ventilation groove even when the terminal block cover is not correctly attached.

  The front cover into which the liquid crystal panel and the terminal block are fitted should be a part of the casing and should be difficult to remove for security reasons. For this reason, screws that cannot be turned with a normal screwdriver are used and firmly fixed to other adjacent casings. However, it is difficult to completely prevent malicious screw removal. In the unlikely event that unauthorized removal is performed, it is desirable that this can be grasped later.

  The present invention has been developed on the basis of such a situation, and an object of the present invention is to provide a ventilation structure for a microcomputer meter that can prevent unauthorized operation and prevent entry of foreign matter.

  The invention according to claim 1 for solving the above problem is a ventilation structure of a microcomputer meter having a control room made of electronic components, and a front cover which is a part of a casing is provided on the front surface of the microcomputer meter. In addition to disposing the control chamber at the back of the front cover, the front cover is provided with an inner wall surface into which a terminal block connected to the control chamber is fitted. A ventilation groove serving as a flow path is formed, and the ventilation groove is disposed so as to connect a ventilation hole communicating with the outside and a ventilation hole communicating with the internal space in which the control chamber or the like is disposed, A sealing structure for covering the entire ventilation groove is attached to the inner wall surface of the microcomputer meter.

  The present invention is based on the premise that the microcomputer meter has a built-in safety function, etc., and in order for the pressure sensor for measurement to function properly, the internal space must be matched with the atmospheric pressure, and a ventilation structure is provided. is there. Further, the microcomputer meter according to the present invention has a shell formed of a plurality of casings as in the conventional case, and a liquid crystal panel is incorporated on the front side in order to inform gas consumption and the like. Further, a control room serving as a brain part is provided inside the casing.

  The front cover is a component that constitutes one corner of the casing and is located above the front surface of the microcomputer meter. A cutout is provided near the center of the front cover to expose the liquid crystal panel. Further, in order to dispose the terminal block below the cutout, a step is formed so as to sink into the back. The bottom of the step is an upright wall surface, and this surface is hereinafter referred to as an inner wall surface. A cutout is provided near the center of the inner wall surface to expose the terminal block. A terminal block cover is attached to the front cover to protect the terminal block.

  The ventilation groove is a channel for taking outside air into the internal space, and is formed so as to cut the surface of the inner wall surface, and normally extends in the vertical direction in order to prevent entry of foreign matter. However, as long as the object can be achieved, the specific path and configuration of the ventilation groove are free and are not limited to a straight line, and may be bent. In order to avoid complication of the manufacturing process, the ventilation groove is not a tunnel shape with the entire circumference closed, but a groove shape exposed on the inner wall surface.

  The vent is a flow path provided in the front cover for taking in outside air, and is arranged at the lower part of the front cover to prevent entry of foreign matter, and is opened to the outside on the back surface of the front cover. The control room side of the vent is connected to the vent groove. Accordingly, the vent extends from the outside air side toward the front of the front cover and reaches the ventilation groove. In addition, a filter is often fitted in the vent in order to prevent foreign matter from entering.

  The ventilation hole is a flow path for sending outside air that has flowed into the ventilation groove into the internal space, and connects the back surface of the front cover and the ventilation groove. Outside air that has flowed in through the vents passes through the ventilation groove, but even if moisture is mixed in, it falls in the process, and outside air that has lost moisture reaches the vents and flows into the internal space from there. . In addition, since the foreign material has already been removed, the air vent is not required to have a filter or the like, and is configured with only a simple hole.

  The sealing body is a thin plate having flexibility, with an adhesive attached on one side (generally called a seal), and is attached to the inner wall surface of the front cover and used to completely block the ventilation groove. . The ventilation groove is formed so as to cut the surface of the inner wall surface as described above, and the ventilation groove is necessarily exposed to the inner wall surface. Therefore, a sealing body is attached to completely close the opening of the ventilation groove to prevent foreign matter from entering from the ventilation groove.

  Since the inner wall surface to which the sealing body is affixed is usually covered with a terminal block cover, even if the sealing body is not affixed, foreign matter does not enter from the ventilation groove. However, the terminal block cover may be removed intentionally, and a screw for attaching the terminal block cover may loosen to create a gap. Therefore, a sealing body is affixed to prevent foreign matter from entering from the ventilation groove regardless of the state of the terminal block lid.

  Thus, the front cover that constitutes one corner of the casing of the microcomputer meter is provided with a ventilation groove, and this ventilation groove connects the ventilation hole communicating with the outside and the ventilation hole communicating with the internal space, and further the inner wall surface of the front cover. In this case, by adhering a sealing body that closes the ventilation groove, it is possible to prevent the entry of foreign matter from the ventilation groove without forming the ventilation groove in a tunnel shape.

  The invention according to claim 2 corresponds to an unauthorized operation such as intentionally removing the front cover, and a mounting hole for inserting a fastening screw for fixing the front cover is provided on the bottom surface of the ventilation groove, By accommodating the head of the fastening screw in the ventilation groove, the sealing body needs to be peeled off when removing the fastening screw. Here, the fastening screws are used to attach the front cover to another casing, and a plurality of fastening screws are inserted into the outer edge or the like of the front cover. The “bottom surface of the ventilation groove” refers to a surface corresponding to a valley bottom when the inner wall surface is viewed from the front.

  The mounting hole is a round hole formed in the bottom surface of the ventilation groove for inserting the fastening screw, and has an inner diameter through which the shaft portion of the fastening screw can pass. It is assumed that when the fastening screw is tightened, the entire head is accommodated in the ventilation groove. Therefore, it is necessary to consider the width and depth of the ventilation groove. Of course, the fastening screw is inserted before the sealing body is attached, and after the sealing body is attached, the fastening screw is covered.

  By inserting the fastening screw into the ventilation groove and using a non-translucent sealing body in this way, the presence of the fastening screw is obscured, making it difficult to remove the front cover, leading to illegal activities. It becomes difficult. A plurality of fastening screws are inserted into the outer edge or the like of the front cover, but the front cover cannot be removed unless the fastening screws in the ventilation groove are also removed. Further, when the sealing body is peeled off or when a part thereof is broken, it is difficult to restore the sealing body to its original state after that, and some traces such as wrinkles, misalignments and tears remain. For this reason, it is possible to grasp fraudulent acts when checking the microcomputer meter.

  As in the first aspect of the present invention, a vent groove is provided in the front cover that constitutes one corner of the casing of the microcomputer meter, and the vent groove connects the vent hole communicating with the outside and the vent hole communicating with the internal space. In addition, the air groove is hermetically sealed by attaching a sealing body that closes the air groove on the inner wall surface of the front cover. Therefore, even when the terminal block cover is detached, it is possible to prevent foreign matter from entering the internal space. Further, since the ventilation groove is not in a tunnel shape in which the entire periphery is closed, the manufacturing process can be simplified and the cost is not increased.

  As in the second aspect of the invention, as a structure for inserting the fastening screw into the ventilation groove, the presence of the fastening screw is covered and the front cover is removed by using a non-translucent sealing body. It becomes difficult and it is hard to invite illegal acts. Further, when the sealing body is peeled off or damaged, it is difficult to restore the sealing body to the original state thereafter, and some trace remains. For this reason, it is possible to grasp fraudulent acts when checking the microcomputer meter. The sealed body is premised on durability, but a so-called security seal may be used.

It is a perspective view showing the ventilation structure of the microcomputer meter according to the present invention, but the front cover and its periphery are schematically drawn, and the shape is different from the actual product. FIG. 2 is a perspective view showing a process of attaching a sealing body and attaching a terminal block lid in the microcomputer meter depicted in FIG. 1. It is a front view of the actual microcomputer meter by this invention. In addition, the terminal block cover illustrated in FIG. 1 and the like is removed, and the terminal block is exposed. It is a side view of the microcomputer meter of FIG. In order to explain the structure of the ventilation groove, a part is drawn in a cross section, and further, an enlarged vertical cross section of the ventilation groove and its periphery is drawn in the lower left of the figure. It is the perspective view and longitudinal cross-sectional view which show the example of a measure which prevents the nesting of the ant in a vent hole. It is a perspective view which shows an example of the path | route of a ventilation groove at the time of changing the positional relationship of a vent hole and a vent hole.

  FIG. 1 shows a ventilation structure of a microcomputer meter according to the present invention. The front cover 12 and its periphery are schematically depicted, and the shape is different from the actual product. As shown in this figure, the outer shell of the microcomputer meter is composed of a plurality of metal casings such as the front cover 12 and the upper case 13, and the front cover 12 is located above the front surface, and the liquid crystal panel 54 is located there. It is inserted. A return button 21 that is operated when resuming the gas supply is also incorporated in the front cover 12.

  Behind the front cover 12 is provided a control room 51 composed of electronic components, which is the brain part of the microcomputer meter. The front cover 12 is disposed so as to cover the front surface of the upper case 13, and both are integrated with a fastening screw 53. In order to prevent fraud, the fastening screw 53 is of a type that cannot be rotated by a normal driver.

  A display window 24 cut out in a rectangular shape is provided on the upper front surface of the front cover 12 in order to expose the liquid crystal panel 54. Further, a step 25 that is recessed backward is provided below the display window 24, and the bottom of the step 25 is referred to as an inner wall surface 26. A terminal block 52 connected from the control chamber 51 is fitted into the inner wall surface 26. Therefore, a terminal window 27 cut out in a rectangular shape is provided near the center of the inner wall surface 26. Further, the inner wall surface 26 is provided with a ventilation groove 28 for sending outside air into the internal space of the microcomputer meter.

  The ventilation groove 28 is a groove-like portion in which the inner wall surface 26 is locally retreated. In FIGS. 1 to 5, the ventilation groove 28 extends in the vertical direction and becomes a flow path for taking in outside air. Therefore, a ventilation port 32 connected to the outside is provided at the lower part of the ventilation groove 28, and a ventilation hole 35 connected to the control chamber 51 is provided at the upper part. The vent 32 is open to the outside at the lower back of the front cover 12, from which outside air can be taken. Further, a filter 34 is fitted in the vent hole 32 in order to prevent foreign matter from entering. On the other hand, the vent hole 35 is a simple hole that reaches the internal space where the control chamber 51 is located from the vent groove 28. Since the ventilation groove 28 extends in the vertical direction, even if the outside air mixed with moisture is sucked in, the ventilation groove 28 naturally falls into the ventilation hole 32 and does not reach the ventilation hole 35.

  An attachment hole 33 is provided in the center of the ventilation groove 28 for inserting the fastening screw 53. The mounting hole 33 is for allowing the shaft portion of the fastening screw 53 to pass through, and the tip end portion of the fastening screw 53 is screwed into a female screw (not shown) of the upper case 13. Further, the head of the fastening screw 53 is accommodated in the ventilation groove 28, but does not protrude higher than the inner wall surface 26. In addition, it is necessary to use a plurality of fastening screws 53 other than the ventilation groove 28, and a side ear 22 for inserting the fastening screws 53 is provided on the upper portion of the front cover 12, and a mounting hole 23 is formed there. It is.

  The terminal block 52 is not used except during connection work, and is usually covered with a terminal block cover 41 to improve aesthetics and prevent mischief. The terminal block lid 41 has a shape that fills the step 25 without a gap, and is attached to the front cover 12 with a retaining screw 47. Therefore, a female screw 37 is formed on the inner wall surface 26, and a concave surface 43 is formed on the terminal block lid 41 in order to embed the head of the retaining screw 47. The stop screw 47 is of a type that can be rotated with a normal screwdriver in consideration of convenience during inspection.

  The terminal block cover 41 is reattached to the front cover 12 after completion of the wiring work. At this time, the terminal block cover 41 may be lifted from the front cover 12 due to a tightening failure of the set screw 47 or the like. In addition, the terminal block cover 41 may be intentionally removed. As described above, when the terminal block cover 41 is not properly attached, the vent hole 35 is exposed to the outside, so that the filter 34 and the vent groove 28 cannot perform their original functions, and moisture, ants, etc. Will invade. Therefore, a sealing body 31 that completely covers the ventilation groove 28 is attached to the inner wall surface 26 to eliminate the influence of the terminal block lid 41. If the ventilation groove 28 is formed in a complete tunnel shape when the front cover 12 is manufactured, the sealing body 31 is not necessary, but the manufacturing process becomes complicated and maintenance is difficult.

  The sealing body 31 is made by attaching an adhesive to one surface of a flexible synthetic resin plate, has higher durability than a general seal, and secures a size that covers the ventilation groove 28 with a margin. It is. The fastening screw 53 inserted into the attachment hole 33 is covered and hidden by the sealing body 31, and those who are not familiar with the structure of the microcomputer meter cannot find the fastening screw 53 and can prevent unauthorized modification. Further, after the sealing body 31 is peeled off, it is difficult to restore it to the original state, and if the fastening screw 53 is removed, the fact can be grasped later. Note that a security seal may be used for the sealing body 31. In addition, the sealing body 31 uses a non-light-transmitting thing for the purpose.

  FIG. 2 shows a process of attaching the sealing body 31 and attaching the terminal block lid 41 in the microcomputer meter depicted in FIG. As shown in the upper right of the figure, the ventilation groove 28 is formed so as to locally retreat the inner wall surface 26, and a filter 34 is fitted in the ventilation hole 32 below the ventilation groove 28. A fastening screw 53 is inserted into the mounting hole 33. When the ventilation groove 28 is exposed as described above, the outside air flows into the ventilation hole 35 as it is, and there is a possibility that foreign matter may enter the internal space. However, as illustrated on the left side of the middle of FIG. 2, when the sealing body 31 is attached to the inner wall surface 26 and the ventilation groove 28 is completely closed, only the outside air that has passed through the filter 34 flows into the ventilation hole 35. Further, the sealing screw 31 covers and hides the fastening screw 53 in the ventilation groove 28.

  Then, as shown in the lower right of FIG. 2, when the terminal block cover 41 is attached so as to cover the step 25, the terminal block 52 and the sealing body 31 are covered. Further, since the terminal block cover 41 fills the step 25 without a gap, the terminal block cover 41 has an external appearance integrated with the front cover 12 and is excellent in beauty. The terminal block cover 41 is attached with a retaining screw 47, but its head is accommodated in the concave surface 43 and does not protrude from the surface of the terminal block cover 41.

  FIG. 3 shows the actual microcomputer meter according to the present invention as seen from the front. Note that the terminal block cover 41 illustrated in FIG. 1 and the like is removed, and the terminal block 52 is exposed. The microcomputer meter is composed of three types of casings, a main case 11, an upper case 13, and a front cover 12. The upper case 13 is placed right above the main case 11, and the front cover 12 closes the front side of the upper case 13. It is out. A liquid crystal panel 54 and a return button 21 are arranged on the front upper portion of the front cover 12, and a terminal block 52 is disposed on the inner wall surface 26 below the liquid crystal panel 54 and the return button 21. A sealing body 31 is attached next to the terminal block 52.

  On the back of the sealing body 31, the ventilation groove 28 is covered and hidden. The ventilation groove 28 extends substantially in the vertical direction, and takes in outside air from the lower ventilation hole 32. The vent 32 is not a simple hole but is fitted with a filter 34 for removing foreign matter. Further, the outside air flows into the front cover 12 through the ventilation hole 35 at the top of the ventilation groove 28. A fastening screw 53 for fixing the front cover 12 is inserted in the middle of the ventilation groove 28. A plurality of fastening screws 53 are arranged in addition to the ventilation groove 28. However, when removing the front cover 12, it is necessary to loosen all the fastening screws 53, and work such as breaking the sealing body 31 is also required. .

  FIG. 4 shows a state in which the microcomputer meter of FIG. 3 is viewed from the side. In order to explain the structure of the ventilation groove 28, a part is drawn in a cross section, and further, an enlarged vertical cross section of the ventilation groove 28 and its periphery is drawn in the lower left of the figure. The vent 32 is disposed at the lower back of the front cover 12, and the periphery is shaped like a corridor so as to eliminate inhalation of rainwater. In addition, a filter 34 is fitted in the vent hole 32 to prevent foreign matter from entering. Further, the ventilation groove 28 extends in the vertical direction, where moisture caused by condensation or the like is dropped. Therefore, foreign matter is removed from the upper part of the ventilation groove 28 and flows into the internal space where the control chamber 51 is located from the ventilation hole 35.

  The fastening screw 53 is inserted from the front cover 12 toward the upper case 13, and a packing 15 is sandwiched between the front cover 12 and the upper case 13 to ensure sealing. A packing 15 is also sandwiched between the case 11 and the upper case 13. In addition, the sealing groove 31 affixed to the inner wall surface 26 seals the ventilation groove 28 and covers the fastening screw 53 therein. When the terminal block cover 41 is attached to the front cover 12, the inner wall surface 26 is covered and hidden.

  FIG. 5 shows a countermeasure example for preventing ant nesting at the vent 32. The vent 32 is provided at an intricate place at the lower back of the front cover 12 in order to prevent rainwater and the like from entering. As a result, it is an ideal nesting site for small creatures that does not suffer from rainwater and is easy to escape from external enemies. In particular, ants prefer to nest in the vent 32 because they prefer an environment where light does not reach. However, the vent 32 is blocked by this, and the pressure sensor that measures the gas supply pressure is normal. Stops functioning.

  Therefore, a light transmission region 38 may be provided in a partial range of the sealing body 31 as illustrated in FIG. The sealing body 31 has a role of covering the fastening screw 53 inserted into the ventilation groove 28, and printing is performed on a transparent synthetic resin plate to ensure light shielding properties. However, only in the translucent area 38, printing is not performed, and there is no light shielding property, and light is transmitted. The translucent area 38 is limited to the range facing the filter 34, and the fastening screw 53 is covered and covered as before.

  The terminal block lid 41 attached to the front cover 12 uses an opaque synthetic resin and has translucency although it is not visible. Therefore, the light transmitted through the terminal block lid 41 passes through the filter 34 from the light transmitting region 38 of the sealing body 31 and prevents the vent 32 from becoming dark. As a result, even if ants enter the vent 32, nesting is prevented and the function of the microcomputer meter is not affected.

  FIG. 6 shows an example of the path of the ventilation groove 28 when the positional relationship between the ventilation hole 32 and the ventilation hole 35 is changed. The vent groove 28 extends upward from the vent 32 and is connected to the vent 35 in principle. However, the vent 35 may not be disposed above the vent 32 due to structural reasons. As a countermeasure example, as illustrated in FIG. 6, the ventilation groove 28 may be shaped like “J” is reversed. Also in this shape, the vent hole 32 is provided in the vicinity of the lowermost portion of the vent groove 28, and the attachment hole 33 into which the fastening screw 53 is inserted is provided above the vent hole 32. However, the vent hole 35 is provided at a point slightly below the uppermost portion of the vent groove 28.

  In FIG. 6, a partition wall 29 that inevitably separates the upper portion of the ventilation groove 28 from side to side is formed. By providing the partition wall 29 in this way, even when the vertical distance between the vent hole 32 and the vent hole 35 is short, a vertical distance necessary for removing foreign matter can be secured above the vent hole 32. There is no loss of reliability. In addition, the sealing body 31 has a shape that covers the entire ventilation groove 28.

11 Case (casing)
12 Front cover (casing)
13 Upper case (casing)
15 Packing 21 Return button 22 Side ear 23 Mounting hole (formed on side ear)
24 Display window 25 Step 26 Inner wall surface 27 Terminal window 28 Ventilation groove 29 Partition 31 Sealing body 32 Ventilation hole 33 Mounting hole (formed in the ventilation groove)
34 Filter 35 Ventilation hole 37 Female screw 38 Translucent area 41 Terminal block cover 43 Concave surface 47 Stop screw 51 Control chamber 52 Terminal block 53 Fastening screw 54 Liquid crystal panel

Claims (2)

A ventilation structure of a microcomputer meter having a control room (51) made of electronic components,
A front cover (12) which is a part of the casing is disposed on the front surface of the microcomputer meter.
In addition to disposing the control chamber (51) behind the front cover (12), the front cover (12) has an inner wall surface (52) into which a terminal block (52) connected to the control chamber (51) is fitted. 26)
The inner wall surface (26) is formed with a ventilation groove (28) serving as an air flow path. The ventilation groove (28) includes a ventilation port (32) communicating with the outside, the control chamber (51), and the like. Is arranged so as to connect the vent hole (35) communicating with the internal space where
A ventilation structure for a microcomputer meter, wherein a sealing body (31) for covering the entire ventilation groove (28) is attached to the inner wall surface (26).   An attachment hole (33) for inserting a fastening screw (53) for fixing the front cover (12) is provided on the bottom surface of the ventilation groove (28), and the head of the fastening screw (53) is attached to the head of the fastening groove (53). The ventilation of the microcomputer meter according to claim 1, wherein when the fastening screw (53) is removed by being housed in the ventilation groove (28), the sealing body (31) needs to be peeled off. Construction.

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