JP2011153490A - Meter unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meter unit which can be used in common for water works meters different in nominal diameter, and which enables connection of the water works meters while achieving commonality of a component. <P>SOLUTION: The meter unit keeps primary-side and secondary-side mounting members 3 and 4 for crimp-fixing the water works meter 5 mounted in the longitudinal direction of a base body 2. In this meter unit, a cap member 51 with crimping surfaces 58 different in nominal diameter is connected to the secondary-side mounting member 4 so that a storage chamber 9 for housing a check valve 50 can be formed inside the secondary-side mounting member 4 and the cap member 51, and the check valve 50 is positioned and fixed via a spacer 52 in the storage chamber 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to, for example, a meter unit for installing a water meter for measuring the amount of water used, and particularly relates to a mounting mechanism portion of the water meter.

  Conventionally, a meter unit for mounting a water meter is usually used corresponding to the nominal diameter of the water meter, and as such a meter unit, for example, the water meter unit of Patent Document 1 is known. Yes. As this type of water meter, specifications such as nominal diameters 13A and 20A are used. Of these, water meters with a nominal diameter of 20A are particularly often used, and meter units also support this. Therefore, a nominal diameter of 20A is often adopted.

When pipes are connected before and after this meter unit, the pipe is often set to a nominal diameter 20A corresponding to the meter unit having a nominal diameter 20A. More and more are connected. This is because it is related to the amount of water used in each house where water meters are installed and the water charge system in the area. Select the nominal size of the water meter according to the amount of water used. In this case, it is possible to attach any water meter having a nominal diameter of 13A and a nominal diameter of 20A by connecting a pipe having a nominal diameter of 20A before and after the meter unit.
Thereby, in the area where the water meter with the nominal diameter 13A is adopted, as described above, a joint for converting the nominal diameter 13A to the nominal diameter 20A is connected before and after the meter unit with the nominal diameter 13A. The connection size before and after the meter unit having a nominal diameter of 13A may be the specification of the nominal diameter of 20A.

JP 2007-297910 A

  However, in order to correspond to a water meter with a nominal diameter of 13A, which is rarely used, a meter unit with a nominal diameter of 13A is installed, and a pipe with a nominal diameter of 20A is connected before and after the meter unit. If the connection size is provided in the specification of the nominal diameter 20A, productivity deteriorates, and various parts are required to connect the water meter. In particular, the addition of joints for changing the nominal diameter before and after the meter unit also led to an increase in cost when installing the piping.

  Furthermore, the water meter has various specifications depending on the difference between the dimensions of the surface, and in this case, different meter units corresponding to the different surface dimensions of the water meter having a nominal diameter of 13A are required. Productivity was significantly worse.

  The present invention has been developed in order to solve the above-described problems, and the object of the present invention is a meter unit that can be shared by water meters of different nominal diameters, An object of the present invention is to provide a meter unit to which an industrial meter can be connected.

  In order to achieve the above object, the invention according to claim 1 is provided with a primary side mounting member and a secondary side mounting member for crimping and fixing a water meter in the longitudinal direction of the base body, and the secondary side mounting member is attached to the secondary side mounting member. A cap member having a crimping surface with a different nominal diameter is joined to form a storage chamber for storing a check valve in the secondary mounting member and the cap member, and the check valve is positioned in the storage chamber via a spacer. It is a fixed meter unit.

  According to the second aspect of the present invention, a check valve is mounted inside the cap member, and the holding protruding piece protruding in the outer peripheral direction of the check valve is pushed into the cap member side by a spacer. This is a meter unit with a stop valve positioned.

  The invention according to claim 3 is a meter unit in which a spacer is formed in a cylindrical shape, and a rear side end portion of the spacer is press-fitted into a press-fit portion formed in a secondary side attachment member.

  The invention according to claim 4 is the meter unit in which the outer peripheral end surface on the back side of the spacer is positioned directly below the inspection hole provided in the secondary mounting member.

  According to the first aspect of the invention, the check valve is positioned via the spacer, so that it can be used for water meters with different nominal diameters, pipes with different nominal diameters can be connected, or nominal diameters with different connection sizes. Water meters with different nominal diameters can be connected without changing to the specifications. As a result, extra piping members can be reduced. For example, if a meter unit for a nominal diameter of 20A is installed in advance corresponding to a water meter having a nominal diameter of 20A that is normally used, A check valve with a nominal diameter of 13A can also be installed, and can be shared by water meters with different nominal diameters. Moreover, since parts can be shared, productivity can be improved. Furthermore, it is possible to change the mounting position of the primary side mounting member and the secondary side mounting member in accordance with the inter-surface dimension of the water meter. In this case as well, parts can be shared, and thus productivity is further improved.

  According to the second aspect of the present invention, by attaching the cap member having the check valve mounted therein to the secondary side mounting member, the check valve can be easily placed in the secondary side mounting member simultaneously with the mounting of the cap member. The check valve can be disposed at a predetermined position by positioning while being displaced so that the protruding piece of the check valve is pushed in by a spacer. For this reason, for example, when an inspection is performed using an inspection substitute tube, the check valve provided in the inspection substitute tube is displaced by a release mechanism that releases the check valve in the valve opening direction and is in a predetermined attached state. The valve can be reliably released for inspection.

  According to the invention of claim 3, the check valve corresponding to the nominal diameter of the meter is accommodated in the secondary mounting member by press-fitting a cylindrical spacer into the press-fitting portion, and when the check valve is replaced When the cap member is removed, the spacer remains in the secondary mounting member in a state where the spacer is fitted into the press-fitting portion. Therefore, the operator can replace the check valve by a simple procedure as in the case without the spacer.

  According to the invention which concerns on Claim 4, the back | inner side of a spacer can be visually recognized from the exterior of a secondary side attachment member through an inspection hole, and the presence or absence and mounting state of a spacer can be confirmed easily.

It is sectional drawing which shows one Embodiment of the meter unit of this invention. It is a partially expanded sectional view of FIG. It is an expanded sectional view which shows the state which removed the cap member of FIG. It is an enlarged side view of a spacer. It is a schematic cross section which shows the contact state of a spacer and a non-return valve. It is sectional drawing which shows other embodiment of the meter unit of this invention.

An embodiment of a meter unit in the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the meter unit of the present invention.
In FIG. 1, a meter unit main body 1 has a base body 2, a primary side mounting member 3, and a secondary side mounting member 4, and a primary side mounting member 3 and a secondary side in the longitudinal direction of the base body upper surface 2a. A side attachment member 4 is attached, and a water meter 5 is crimped and fixed between them.

  For example, the base body 2 is formed in a long shape from a metal plate material such as steel by press drawing. The base body 2 is opened downward and has a base portion 12 having a substantially U-shaped cross section having both side lower surfaces 10 and 10 and an upper surface 2a, and flange portions 13 and 13 on both sides of the base portion 12. Yes. The holding band 6 can be placed on both sides of the base portion 12 in the longitudinal direction, that is, on the upper surface 2a. Four insertion holes 15 are formed near both sides of the upper surface 2a, and a notch groove 16 for fixing anchor bolts (not shown) is formed at the center position of the outer end of the flange portion 13.

Of the primary side mounting member 3 and the secondary side mounting member 4, the primary side mounting member 3 is the crimping side, and the secondary side mounting member 4 is the side to be crimped by the primary side mounting member 3. Yes.
1 to 3, the secondary mounting member 4 is formed of an appropriate metal material by casting or the like, and the material before processing and the finished product after processing have the same shape as the size of the nominal diameter 20A, for example. . A perforation hole 63 is formed in the attachment direction of the water meter 5 on the inner peripheral side of the secondary side attachment member 4, and a female screw portion 62 is formed on the primary side of the perforation hole 63. An annular press-fit portion 68 is formed on the secondary side. An inner diameter (not shown) of the press-fit portion 68 is set to be slightly smaller than an outer diameter of a protruding portion 54 of the spacer 52 described later.

  An inspection hole 67 communicates with the press-fit portion 68 from the outside of the secondary side attachment member 4, and a female screw 64 is formed on the opening side of the inspection hole 67. A plug 66 having a sealing O-ring 65 can be screwed onto the female screw 64, and when the plug 66 is removed, the spacer 52 can be removed from the outside of the secondary mounting member 4 through the inspection hole 67. The wearing state becomes visible. Further, the inspection hole 67 is also used for pressure inspection. In this case, by connecting an inspection plug (not shown) to the inspection hole 67, it is possible to inspect the pressure of the internal flow path when the water meter 5 is fixed by crimping. Become. A female screw 40 is provided on the bottom surface side of the secondary mounting member 4, and a fixing bolt 41 can be screwed to the female screw 40.

  A cap member 51 is coupled to the secondary side attachment member 4, and a storage chamber 9 is formed inside the secondary side attachment member 4 and the cap member 51. A check valve 50 can be stored in the storage chamber 9, and the check valve 50 is positioned and fixed in the storage chamber 9 via a spacer 52.

  As shown in FIG. 3, the cap member 51 is formed in a substantially cylindrical shape, and an attachment portion 53 that is a concave portion is formed on the inner peripheral side thereof. Further, following the attachment portion 53, an enlarged diameter insertion portion 59 is formed. Is formed on the secondary side. The inner diameter (not shown) of the insertion portion 59 is set to be larger than the outer diameter formed by the protruding portion 54 of the spacer 52, thereby preventing the spacer 52 from being pressed into the cap member 51.

  A cap screw 51 is provided on the outer periphery on the secondary side of the cap member 51, and a crimping portion 56 is provided on the primary side to be crimped to the water meter 5, and a gasket 27 is attached to the crimping portion 56. A crimping surface 58 to the meter 5 is configured. An annular groove 60 is formed on the outer peripheral side of the cap member 51 in the vicinity of the crimping surface 58, and an O-ring 61 is mounted between the male screw part 55 and the crimping part 56.

  A check valve 50 is mounted on the mounting portion 53 inside the cap member 51, and the cap member 51 is attached to the secondary side by screwing the male screw portion 55 to the female screw portion 62 of the secondary side mounting member 4. A crimping surface 58 having a different nominal diameter is disposed on the water meter 5 side in combination with the member 4.

  The spacer 52 is formed in a cylindrical shape, and the inner side end 52 a of the spacer 52 is press-fitted into the press-fitting portion 68 of the secondary attachment member 4. By using the spacer 52, a check valve having a different nominal diameter, that is, a check valve having a nominal diameter of 13A, which is different from the check valve having a nominal diameter of 20A mounted in the secondary mounting member 4 of the present embodiment. 50 can be positioned and fixed.

  In FIGS. 2 and 3, the spacer 52 is formed of, for example, a resin such as PVC (polyvinyl chloride), and the outer peripheral end surface 52 b on the back side of the spacer is inspected in the secondary-side mounting member 4 after being press-fitted into the press-fit portion 68. It is provided in such a length as to be located immediately below 67. As shown in FIG. 4, a protrusion 54 is formed on the outer peripheral side of the spacer 52. Since the inner diameter of the press-fit portion 68 is slightly smaller than the outer diameter of the protrusion 54 as described above, the spacer 52 Is attached to the secondary support member 4, the spacer 52 is press-fitted into the press-fit portion 68, and the contact area between the projecting portion 54 and the press-fit portion 68 is reduced, so that the press-fit is more firmly performed. Combined.

  As shown in FIG. 5, the inner diameter of the spacer 52 is set to a diameter that can hold the protruding piece 101 for holding the check valve 50, and the spacer 52 pushes the protruding piece 101 toward the cap member 51. In this way, the check valve 50 is positioned.

  The above-described check valve 50 is provided to flow water flowing through the water meter 5 to the secondary side and prevent backflow from the secondary side. The check valve 50 is provided in a cartridge shape that can be attached to and detached from the attachment portion 53 of the cap member 51.

  As shown in FIGS. 2 and 3, the check valve 50 includes a valve box 102 and a disc holder 100, and a seal member 103, a spring 104, and a valve body 105 are included in the check valve 50. The valve body 105 is configured to come into contact with the seal member 103 by an elastic force of the spring 104 in the flow direction of the check valve 50 (the direction from the disk holder 100 toward the valve box 102). The seal member 103 is accommodated between the valve box 102 and the disc holder 100. The protruding piece 101 is formed so as to protrude in the outer peripheral direction on the end side of the disk holder 100.

  The check valve 50 includes, for example, nominal diameters 13A and 20A. FIG. 1 shows an example in which a check valve having a nominal diameter 13A is mounted. This check valve 50 is detachably mounted on a mounting portion 53 (described later) of the cap member 51 via an O-ring 57 and is accommodated in the secondary side mounting member 4 while the disk holder 100 side is positioned by the spacer 52. Is done.

  On the other hand, the primary side attachment member 3 is formed from an appropriate metal material by casting or the like, similarly to the secondary side attachment member 4, and both the raw material before processing and the finished product after processing have, for example, a nominal diameter of 20A. Same shape as size. A female screw portion 36 is formed on the inner peripheral side of the primary side mounting member 3, and the primary side mounting member 3 is provided with a hole-like portion penetrating from the female screw portion 36. The internal thread 37 is formed in communication with the internal thread 37, and a fixing screw 38 is screwed onto the internal thread 37.

A female screw 40 is provided on the bottom surface side of the primary side mounting member 3, and a fixing bolt 41 such as a hexagon socket bolt can be screwed to the female screw 40. A through hole 42 extends from the female screw 40 on the side communicating with the hole-like portion, and a pin 43 can be inserted into the through hole 42.
As shown in FIG. 1, the primary side attachment member 3 is provided with a crimping member 20, a handle 21, and a pipe 23.

  In FIG. 1, the crimping member 20 is formed in a substantially cylindrical shape, and a male screw portion 25 is provided on the outer peripheral side of attachment to the primary side attachment member 3, and a diameter-enlarged crimping portion 26 is provided on the crimping side with the water meter 5. Have. In the same manner as in the case of the pressure-bonding portion 56, the pressure-bonding portion 26 is provided so that a gasket 27 can be attached thereto.

  On the outer peripheral side in the vicinity of the crimping surface 28 of the crimping member 20, a latching portion 30 is formed as a latching groove formed continuously on the outer periphery of the crimping member 20, and the outer periphery of the end of the crimping member 20 on the pipe 23 side is formed. Is attached with an O-ring 31. A handle 21 is integrated on the outer peripheral side of the enlarged diameter portion of the crimping portion 26. By integrating the crimping member 26 and the handle, when the handle 21 is rotated, the crimping member 20 rotates integrally with the handle 21.

  The pipe 23 is provided so as to be connectable to an external flow path (not shown), and includes, for example, an elbow as shown in FIG. An annular groove 45 is formed on the outer periphery of the pipe 23 on the insertion side to the primary attachment member 3. A ball valve 47 is connected to the side of the pipe 23 connected to the external flow path by a tightening nut 46.

  In the above-described primary side mounting member 3, the crimping member 20 is fitted into the pipe 23 while the primary side is sealed by the O-ring 31, and is attached to the primary side mounting member 3 together with the pipe 23. At this time, the male screw portion 25 of the crimping member 20 and the female screw portion 36 of the primary side attachment member 3 are screwed together.

  The pipe 23 is inserted from the primary side of the primary side attachment member 3, and a pin 43 is fitted into the lower side of the annular groove 45 from the through hole 42, and 1 is placed on the upper side of the annular groove 45. A fixing screw 38 that is screwed into the female screw 37 of the secondary attachment member 3 is fitted. With this structure, the pipe 23 is rotatably attached to the primary attachment member 3 while being prevented from being pulled out. The pipe 23 can be rotated with respect to the primary side mounting member 3 by loosening the fixing screw 38, and is simply fixed to the primary side mounting member 3 by tightening the fixing screw 38.

  By adopting a structure in which the crimping member 20 is attached to the primary side attachment member 3 by screwing, when the handle 21 is rotated, the crimping member 20 is rotated while the crimping surface 28 is rotated. It is designed to move forward and backward with respect to the crimping direction.

  Further, a holding band 6 is disposed between the primary side mounting member 3, the secondary side mounting member 4 and the base body 2, and the water meter 5 is prevented from being installed in the holding band 6 in the reverse direction. A projection 75 is provided for this purpose. The holding band 6 is formed in an elongated shape with a width that can be placed on the upper surface 2a of the base body 2 by using an elastic resin such as ABS resin or polyacetal. As shown in FIG. 1, a protrusion 70 that can be inserted into the insertion hole 15 is formed in a downward direction at a position corresponding to the insertion hole 15 in the vicinity of both sides of the holding band 6. A through hole 71 for fixing the fixing bolt 41 is formed corresponding to the insertion hole 15.

  On the inner side of the through holes 71, 71 of the holding band 6, a substantially rectangular parallelepiped rail portion 72 that guides the support member 7 along the shaft core P for attaching the water meter 5 is formed to project on the primary side. Has been. On the other hand, on the secondary side, the meter receiving member 8 is guided along the axis P, and a substantially rectangular parallelepiped rail portion 73 having a different cross-sectional shape from the rail portion 72 is formed to project. Each rail part 72 and 73 is provided in the holding band 6 so that the supporting member 7 and the meter receiving member 8 can be guided along the axis P.

  A protrusion 75 is formed on the distal end side of the secondary rail 73 so as to be displaced from the axis P, and this protrusion 75 is formed on the bottom surface side of the water meter 5 placed in a predetermined direction. By contacting the locking piece 5c, reverse installation of the water meter 5 is prevented. Although not shown, the holding band 6 may have a separate structure.

  The holding band 6 is placed on the base body upper surface 2 a and is integrally fixed to the base body 2 while being interposed between the base body 2 and the primary side mounting member 3 and the secondary side mounting member 4. At this time, the fixing bolt 41 is screwed onto the female screw 40 through the insertion hole 15 and the through hole 71 from the lower side of the base body 2, whereby the base body 2, the holding band 6, and the primary side mounting members 3, 2. The secondary attachment member 4 is integrated.

  In FIG. 1, the support member 7 and the meter receiving member 8 are formed of the same resin material as that of the holding band 6, and are attached to rail portions 72 and 73 from the upper side of the holding band 6. It is arranged at a position corresponding to the distance between the surfaces of the water meter 5 and can receive the side portions 5 a and 5 b on both sides of the water meter 5.

  In the above embodiment, the holding band 6 is provided with the support member 7 and the meter receiving member 8, and the holding band 6 is attached to the base body 2. However, the holding band may be omitted. It is also possible to arrange a support member or a protrusion directly on the upper surface of the body.

Next, the operation of the meter unit of the present invention in the above embodiment will be described.
In the meter unit of the present invention, a primary side mounting member 3 and a secondary side mounting member 4 for crimping and fixing a water meter 5 are mounted in the longitudinal direction of the base body 2, and a nominal diameter is attached to the secondary side mounting member 4. Cap members 51 having different crimping surfaces 58 are combined to form a storage chamber 9 for accommodating the check valve 50 inside the secondary mounting member 4 and the cap member 51, and a spacer 52 is interposed in the storage chamber 9. Since the check valve 50 is positioned and fixed, it is possible to connect the water meter 5 having different nominal diameters without connecting pipes having different nominal diameters or changing the connection sizes to specifications having different nominal diameters.

  Thus, for example, if the primary side mounting member 3, the secondary side mounting member 4, the support member 7, and the meter receiving member 8 are formed so as to be commonly used for the nominal diameters 13A and 20A, the nominal diameter 20A is obtained. It is possible to connect the water meter 5 having a nominal diameter of 13A by accommodating the check valve 50 for the nominal diameter 13A simply by mounting the spacer 52. For this reason, the components of the meter unit main body 1 are connected without connecting joints for conversion to the nominal diameter 13A before and after the meter unit main body 1 or changing the connection size before and after the meter unit main body of the nominal diameter 13A to the nominal diameter 20A. Can be shared, and as a result, productivity can be improved.

  The check valve 50 is mounted in a positioning state at a predetermined position of the mounting portion 53 by having a holding protruding piece 101 formed so as to protrude in the circumferential direction pushed into the cap member 51 side by a spacer 52. Thus, the check valve 50 is attached to the mounting portion 53 of the cap member 51 in a sealed state via the O-ring 53 by being pushed into the cap member 51 side by the spacer 52. The check valve only needs to be positioned with the secondary side end abutted against the end of the spacer on the cap member side, the inner circumferential side of the spacer, etc. Absent. For this reason, although not shown, for example, a rib may be provided on the inner peripheral side of the spacer, and the secondary side end of the check valve 50 may be brought into contact with the rib.

After the check valve 50 is mounted, the outer peripheral end surface 52b on the back side of the spacer 52 is positioned directly below the inspection hole 67. Therefore, the spacer 52 is moved from the outside of the secondary mounting member 3 through the inspection hole 67. It is possible to visually check, and it is possible to easily check whether or not the spacer 52 is mounted and the mounting state.
In addition, since the spacer 52 is positioned on the outer diameter side of the check valve 50, the spacer 52 is prevented from projecting toward the flow path, and the flow area is secured to prevent the flow of water from being hindered. The

  Further, when the cap member 51 is removed from the secondary mounting member 4 when the check valve 50 is replaced, the inner end 52a of the spacer 52 is press-fitted into the press-fit portion 68. The spacer 52 remains in the press-fit portion 68 in the fitted state. For this reason, the operator who replaces should just replace the check valve 50 in the cap member 51, and should install this check valve 50 with the cap member 51 in the original state. Even when the spacer 52 is mounted in this way, the check valve 50 can be replaced in the same manner as in the case of the nominal diameter 20A without mounting the spacer, and the operation is simple.

  Further, by adjusting the position of the support member 7 and the meter receiving member 8 in the direction of the axis P with respect to the holding band 6 via the rail portions 72 and 73, the side of the water meter 5 having different face-to-face dimensions. The parts 5a and 5b are supported by the bearing member 7 and the meter receiving member 8, and the water meter 5 can be fixed by crimping with the crimping member 20 and the cap member 51 in this state.

  When the water meter 5 is attached to the meter unit body 1, the crimping member 20 is rotated by the handle 21 from the state where the water meter 5 is placed. As a result, the crimping member 20 and the support member 7 move in the crimping direction, and the water meter 5 with the side portions 5 a and 5 b of the water meter 5 supported by the crimping member 20 and the support member 7. The water meter 5 is crimped and fixed in a state where the primary side and the secondary side are supported and aligned by the crimping member 20, the supporting member 7, the cap member 51, and the meter receiving member 8. Is done.

  FIG. 6 shows another embodiment of the meter unit of the present invention. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted. The meter unit main body 90 in this embodiment can be attached with a long-type water meter 92 by using a long holding band 91.

The holding band 91 is provided with two through holes 93 and 93 for fixing with the fixing bolts 41 in the vicinity of each side portion, and projecting portions 94 and 94 are formed to protrude inside the through hole 93.
When the long-type meter unit main body 90 is configured using the holding band 91, the protrusion 94 is fitted into the through hole 93 to position the holding band 91 on the base body 2, and in this state, the primary side The mounting member 3 and the secondary side mounting member 4 are mounted on the base body 2, and the fixing bolt 41 is screwed onto the female screw 40 from the lower side of the base body 2 through the insertion hole 15 and the through hole 93. 91 and the base body 2, the primary side attachment member 3, and the secondary side attachment member 4 are integrated.

  Also in the meter unit main body 90 using the long holding band 91 for such a base body 2, the parts of the respective parts are made common in the same manner as described above, and the reverse of the different nominal diameter is provided in the storage chamber 9 via the spacer 52. Since the stop valve 50 can be positioned and fixed, for example, a meter unit for a nominal diameter 20A can be used for a nominal diameter 13A and a water meter 5 having a nominal diameter 13A can be connected, as in the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Meter unit main body 2 Base body 3 Primary side attachment member 4 Secondary side attachment member 5 Water meter 9 Accommodating chamber 50 Check valve 51 Cap member 52 Spacer 52a End part 52b End face 58 Crimp surface 67 Inspection hole 68 Press fit part 101 Protruding piece 111 rib

Claims (4)

  In the longitudinal direction of the base body, a primary side mounting member and a secondary side mounting member for crimping and fixing a water meter are attached, and a cap member having a crimping surface with a different nominal diameter is coupled to the secondary side mounting member. A meter unit characterized in that an accommodation chamber for accommodating a check valve is formed inside the secondary mounting member and the cap member, and the check valve is positioned and fixed in the accommodation chamber via a spacer.   A check valve is mounted inside the cap member, and the check valve is positioned so that a holding protruding piece protruding in the outer peripheral direction of the check valve is pushed into the cap member side by the spacer. The meter unit according to claim 1.   The meter unit according to claim 1, wherein the spacer is formed in a cylindrical shape, and a rear end portion of the spacer is press-fitted into a press-fitting portion formed on a secondary side attachment member.   The meter unit according to any one of claims 1 to 4, wherein an outer peripheral end surface of the back side of the spacer is positioned immediately below an inspection hole provided in the secondary-side mounting member.

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