Pressure gauge and fluid pressure system

Abstract

A pressure gauge and a fluid pressure system are provided. A pressure gauge (14) of a fluid pressure system (10) has a measuring portion (28), a housing (32), a display portion (30), and an adapter (24). The adapter (24) includes a mounting hole (88). The housing (32) has a mounting protrusion (69) that is capable of being fitted with the mounting hole (88). The display portion (30) has a display surface (37) that faces in a direction that intersects with an axis (Ax) of the mounting protrusion (69). The mounting protrusion (69) and the mounting hole (88) have a fitting configuration that is capable of changing a relative position of the mounting protrusion (69) and the adapter (24) in a circumferential direction that is centered on the axis (Ax) of the mounting protrusion (69).

Description

Technical Field

[0001] This invention relates to pressure gauges and fluid pressure systems. Background Technology

[0002] For example, Japanese Patent Application Publication No. 10-206262 discloses a pressure gauge installed in a fluid pressure device. This pressure gauge includes: a housing housing a measuring part for measuring the pressure of a fluid; and a display part disposed within the housing. The housing is fixed to the fluid pressure device by a threaded member. The display part has a display surface facing the axial direction of the threaded member. Summary of the Invention

[0003] In pressure gauges like the one described above, the orientation of the display face cannot be changed when the gauge is installed in a fluid pressure device. Therefore, depending on the user's method of use, the pressure gauge display face may sometimes face a direction that is difficult to visually discern.

[0004] The purpose of this invention is to solve the above-mentioned problems.

[0005] One aspect of the present invention is a pressure gauge comprising: a housing housing a measuring portion for measuring the pressure of a fluid; a display portion disposed in the housing and displaying the pressure measured by the measuring portion; and an adapter mounted on a fluid pressure device, the adapter including a mounting hole, the housing having a mounting protrusion capable of engaging with the mounting hole, the display portion having a display surface facing a direction intersecting an axis of the mounting protrusion, and the mounting protrusion and the mounting hole having a fitting configuration capable of changing the relative position of the mounting protrusion and the adapter in the circumferential direction centered on the axis of the mounting protrusion.

[0006] Another aspect of the present invention is a fluid pressure system comprising a fluid pressure device and a pressure gauge installed on the fluid pressure device, wherein the pressure gauge is the aforementioned pressure gauge.

[0007] According to the present invention, the display surface is oriented in a direction intersecting the axis of the mounting protrusion. Furthermore, the mounting protrusion and mounting hole have a fitting structure that allows for changing the relative position of the mounting protrusion and the adapter in the circumferential direction centered on the axis of the mounting protrusion. Therefore, the orientation of the display surface can be easily changed. Thus, the display surface can be oriented in a direction easily visible to the eye, matching the user's usage method.

[0008] The above-mentioned objects, features, and advantages can be easily understood from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a perspective view of a fluid pressure system according to one embodiment of the present invention.

[0010] Figure 2 yes Figure 1 An exploded 3D view of a pressure gauge.

[0011] Figure 3 yes Figure 2 A longitudinal sectional view of the pressure gauge.

[0012] Figure 4 It is along Figure 3 A longitudinal sectional view of line IV-IV.

[0013] Figure 5 yes Figure 2 Front view of the pressure gauge body.

[0014] Figure 6 yes Figure 2 A bottom view of the pressure gauge body.

[0015] Figure 7 yes Figure 2 A cross-sectional view of the adapter.

[0016] Figure 8 It is along Figure 3 A cross-sectional view of line VIII-VIII.

[0017] Figure 9A It has been changed. Figure 1 A three-dimensional view of a first example of a fluid pressure system, showing the orientation of the pressure gauge's display surface. Figure 9B It has been changed. Figure 1 A perspective view of a second example of a fluid pressure system, showing the orientation of the pressure gauge's display surface.

[0018] Figure 10 This is an exploded perspective view of a modified pressure gauge.

[0019] Figure 11 yes Figure 10 Front view of the pressure gauge body.

[0020] Figure 12 yes Figure 10 A bottom view of the pressure gauge body.

[0021] Figure 13 yes Figure 10 A cross-sectional view of the pressure gauge. Detailed Implementation

[0022] like Figure 1 As shown, a fluid pressure system 10 according to one embodiment of the present invention includes a fluid pressure device 12 and a pressure gauge 14 mounted on the fluid pressure device 12. The fluid pressure device 12 is, for example, a regulator (pressure regulator) for adjusting the pressure of a fluid. The regulator includes a valve body 16 and a handle 18.

[0023] The valve body 16 is formed in a cuboid shape. A rotatable handle 18 is mounted on the valve body 16. The valve body 16 has multiple ports 20 for fluid flow. The multiple ports 20 include an inlet port and an outlet port. A pressure gauge 14 is mounted on the outer surface of the valve body 16 in a direction orthogonal to the axis of the handle 18. The handle 18 adjusts the set pressure of the fluid supplied from the fluid pressure device 12. The fluid pressure device 12, on which the pressure gauge 14 is mounted, is not limited to a regulator.

[0024] like Figure 2 As shown, the pressure gauge 14 includes a pressure gauge body 22, an adapter 24, and an anti-disengagement component 26. The pressure gauge body 22 has a measuring section 28, a display section 30, and a housing 32. The measuring section 28 measures the pressure of the fluid. The display section 30 displays the pressure measured by the measuring section 28.

[0025] exist Figure 2 and Figure 3 In this display unit 30, there are a display body 34 and a cover 36. The display body 34 is a square plate-shaped part. A display surface 37 is provided on one side of the display body 34. A scale (not shown) is attached to the display surface 37. In addition, a pointer 38 is rotatably mounted in the center of the display surface 37. A measuring part 28 is mounted on the other side of the display body 34.

[0026] like Figure 2 As shown, the display body 34 has two through holes 40. The two through holes 40 are located at opposite corners of the display body 34. Bolts 41 for mounting the display body 34 to the housing 32 are inserted into each through hole 40.

[0027] The cover 36 is mounted on one side of the display body 34. The cover 36 includes a frame-shaped portion 42 that covers the outer periphery of the display surface 37 in the display body 34 and a transparent portion 44 that covers the display surface 37.

[0028] like Figures 2-4 As shown, the housing 32 is a one-piece molded product made of resin material. The housing 32 has a hollow housing body 46, a fluid inlet 48, and multiple reinforcing ribs 52. The housing body 46 includes a quadrangular cylindrical peripheral wall portion 54 and an end wall portion 56 (see reference). Figure 3 The peripheral wall portion 54 extends in one direction.

[0029] In the following description, the extending direction of the peripheral wall portion 54 is sometimes referred to as the arrow X direction, the width direction of the peripheral wall portion 54 is referred to as the arrow Y direction, and the height direction of the peripheral wall portion 54 is referred to as the arrow Z direction. The arrow Z direction is along the thickness direction of the plate-shaped adapter 24.

[0030] The cross-sectional shape of the outer surface of the peripheral wall 54 is approximately square (see reference). Figure 4 ).exist Figure 2 and Figure 3 In the peripheral wall portion 54, one end (the end in the direction of arrow X1) has a mounting surface 58 for mounting the display unit 30. The mounting surface 58 is a plane facing the direction of arrow X1. The mounting surface 58 has a square shape. In other words, the shape of the mounting surface 58 is the same as the shape of the display body 34. In addition, the size of the mounting surface 58 is the same as the size of the display body 34. A hole 60 for inserting the measuring unit 28 into the internal space S of the peripheral wall portion 54 is formed in the mounting surface 58.

[0031] exist Figure 4 In the middle, each of the four corners of the inner surface of the peripheral wall portion 54 includes a bulge portion 62 that bulges inward toward the inner side of the peripheral wall portion 54. In each bulge portion 62, a nut 64 is embedded for screwing into the bolt 41 for fixing the display portion 30 to the housing body 46.

[0032] like Figure 2 As shown, the display unit 30 is mounted to the housing 32 by screwing two bolts 41, which are inserted into two through holes 40 of the display body 34, and two nuts 64. The display unit 30 can be mounted to the housing 32 such that the relative position of the display unit 30 and the peripheral wall portion 54 is circumferentially centered on the axis of rotation of the pointer 38. In other words, the display unit 30 can be mounted to the housing 32 such that the orientation of the upper end face 35 of the display body 34 is changed.

[0033] Specifically, the display unit 30 can be mounted on the housing 32 with the upper end surface 35 of the display body 34 facing the direction of arrow Z2. Additionally, the display unit 30 can be mounted on the housing 32 with the upper end surface 35 of the display body 34 facing the direction of arrow Y1. Furthermore, the display unit 30 can be mounted on the housing 32 with the upper end surface 35 of the display body 34 facing the direction of arrow Z1. Additionally, the display unit 30 can be mounted on the housing 32 with the upper end surface 35 of the display body 34 facing the direction of arrow Y2. Therefore, when the display unit 30 is mounted on the housing 32, the orientation of the upper end surface 35 of the display body 34 can be changed to match the user's usage method.

[0034] exist Figure 3 In the middle, the end wall portion 56 is located at the other end of the peripheral wall portion 54 (in the direction of arrow X2). The end wall portion 56 covers the internal space S of the peripheral wall portion 54 from the direction of arrow X2.

[0035] like Figure 3 and Figure 4As shown, an inlet flow path 66 for guiding fluid from the fluid pressure device 12 to the measuring section 28 is formed in the fluid inlet section 48. The fluid inlet section 48 includes a mounting protrusion 69, a first inlet pipe section 70, a second inlet pipe section 72, and a connecting pipe section 74. The mounting protrusion 69 protrudes outward from the support wall section 68 in the peripheral wall section 54 in a direction orthogonal to the rotation axis of the pointer 38 (arrow Z1 direction) toward the outside of the peripheral wall section 54 (arrow Z1 direction).

[0036] The first inlet tube 70 extends from the protruding end face of the mounting protrusion 69 toward the direction of arrow Z1. The extended end of the first inlet tube 70 is inserted into the valve body 16 with the pressure gauge 14 installed in the fluid pressure device 12.

[0037] The second inlet tube 72 extends from the support wall 68 in the opposite direction to the extending direction of the first inlet tube 70 (arrow Z2 direction). The second inlet tube 72 extends into the internal space S of the peripheral wall 54. The inner hole of the second inlet tube 72 communicates with the inner hole of the first inlet tube 70. The second inlet tube 72 is connected to the inner surface of the end wall 56 (see reference). Figure 3 ).

[0038] The connecting tube 74 protrudes from the inner surface of the end wall 56 toward the measuring part 28 in the direction of arrow X1. The extended end of the second inlet tube 72 is connected to the connecting tube 74. The inner hole of the connecting tube 74 communicates with the inner hole of the second inlet tube 72. The measuring part 28 is hermetically connected to the protruding end of the connecting tube 74.

[0039] like Figure 3 As shown, the display surface 37 of the display unit 30 faces a direction intersecting the axis Ax of the mounting protrusion 69. In other words, the display surface 37 of the display unit 30 faces a direction orthogonal to the axis Ax of the mounting protrusion 69. A flow path 66 is provided in the mounting protrusion 69 (see reference). Figure 3 and Figure 4 ).

[0040] like Figure 6 As shown, the mounting protrusion 69 has a polygonal mounting outer surface 76. In other words, the mounting protrusion 69 has an octagonal mounting outer surface 76. Specifically, the mounting outer surface 76 is formed as a regular octagon when viewed from the direction of arrow Z1. That is, the mounting outer surface 76 has eight planes 77. The mounting protrusion 69 has a rotationally symmetric shape of 45° centered on the axis Ax of the mounting protrusion 69. In the middle portion of the mounting outer surface 76 in the direction of arrow Z, an annular groove 78 extending circumferentially centered on the axis Ax of the mounting protrusion 69 is formed (see reference). Figures 3-5 ).

[0041] Multiple reinforcing ribs 52 extend from the protruding end face of the mounting protrusion 69 toward the extended end of the first inlet tube 70. In this embodiment, the housing 32 has eight reinforcing ribs 52. These reinforcing ribs 52 are respectively connected to multiple corners of the mounting outer surface 76. The multiple reinforcing ribs 52 are arranged at equal intervals in the circumferential direction centered on the axis Ax of the mounting protrusion 69. The shape, size, number, etc. of the reinforcing ribs 52 can be appropriately set.

[0042] like Figure 2 As shown, the adapter 24 has a square-shaped adapter body 79 and a protrusion 81. Specifically, the adapter body 79 is formed into a square. The adapter body 79 has a first side 80a, a second side 80b, a third side 80c, and a fourth side 80d. The first side 80a and the second side 80b extend in the same direction as each other. The third side 80c and the fourth side 80d extend in a direction orthogonal to the extending directions of the first side 80a and the second side 80b.

[0043] The adapter body 79 has four through holes 84. The four through holes 84 are located at the four corners of the adapter body 79. The adapter body 79 has a rotationally symmetrical shape of 90° about the center line of the adapter body 79 when viewed from the thickness direction. Bolts 86 for mounting the adapter 24 to the fluid pressure device 12 are inserted into the two diagonally opposite through holes 84.

[0044] The protrusion 81 protrudes from one side of the adapter body 79 in the thickness direction. The protrusion 81 extends in a ring shape.

[0045] exist Figure 7 as well as Figure 8 In the adapter body 79, a mounting hole 88 is formed in the central portion for the mounting protrusion 69 to engage. The adapter body 79 includes a mounting inner surface 90 surrounding the mounting hole 88. The mounting inner surface 90 is polygonal. When the mounting protrusion 69 is engaged in the mounting hole 88, the mounting inner surface 90 approaches or contacts the mounting outer surface 76 in a manner that restricts rotation about the axis Ax of the mounting protrusion 69 as the center (see reference). Figure 8 The mounting inner surface 90 has two first planes 92, two second planes 94, and four connecting surfaces 96.

[0046] Each first plane 92 extends along the extending direction of the first side 80a and the second side 80b of the adapter 24. The two first planes 92 are arranged opposite to each other. The length of each first plane 92 along the extending direction is longer than the width of each plane 77 of the mounting outer surface 76. The lengths of the two first planes 92 along the extending direction are the same.

[0047] Each second plane 94 extends along the extending direction of the third side 80c and the fourth side 80d of the adapter 24. In other words, each second plane 94 extends in a direction orthogonal to the extending direction of each first plane 92. The two second planes 94 are arranged opposite each other. The length of each second plane 94 along its extending direction is shorter than the length of each first plane 92 along its extending direction. The lengths of the two second planes 94 along their extending directions are the same.

[0048] Four connecting surfaces 96 connect the ends of the first plane 92 and the ends of the second plane 94 to each other. Each connecting surface 96 has a first connecting plane 98 and a second connecting plane 100. The first connecting plane 98 extends from the end of the first plane 92 toward the mounting hole 88. The first connecting plane 98 extends along the extension direction of the second plane 94.

[0049] The second connecting plane 100 extends from the extended end of the first connecting plane 98 to the end of the second plane 94. The second connecting plane 100 extends in a direction intersecting the extending directions of the first plane 92 and the second plane 94. The length of the second connecting plane 100 along its extending direction is shorter than the length of the second plane 94 along its extending direction. The length of the second connecting plane 100 along its extending direction is shorter than the width of each plane 77 of the mounting outer surface 76 (see reference). Figure 8 ).

[0050] exist Figure 8 In the fitted state, with the mounting protrusion 69 engaged in the mounting hole 88, the eight planes 77 of the mounting protrusion 69 face the two first planes 92, the two second planes 94, and the four second connecting planes 100. In other words, in the fitted state, the four first connecting planes 98 are disengaged from the mounting outer surface 76.

[0051] In the following description, the two second connecting planes 100 that extend from the second plane 94 toward the first side 80a are sometimes referred to as "second connecting plane 100a". In addition, the two second connecting planes 100 that extend from the second plane 94 toward the second side 80b are sometimes referred to as "second connecting plane 100b".

[0052] The adapter 24 has an insertion hole 102 for inserting the anti-disengagement member 26. The insertion hole 102 includes two first holes 104, two second holes 106, and a connecting hole 108. The two first holes 104 extend linearly from the first side surface 80a to the two second connecting planes 100a along the extending direction of the third side surface 80c and the fourth side surface 80d. The two first holes 104 extend parallel to each other. Each first hole 104 is open on the first side surface 80a. Each first hole 104 has a first opening portion 110 that opens into the second connecting plane 100a.

[0053] Two second holes 106 extend linearly along the extension directions of the third side surface 80c and the fourth side surface 80d from the second side surface 80b to the two second connecting planes 100b. The two second holes 106 extend parallel to each other. The cross-sectional shape of each second hole 106 is the same as the cross-sectional shape of each first hole 104. Each second hole 106 opens on the second side surface 80b. Each second hole 106 has a second opening portion 112 that opens onto the second connecting plane 100b. Each second connecting plane 100b is inclined relative to the extension direction of the second hole 106. Therefore, the opening area of ​​the second opening portion 112 is larger than the cross-sectional area of ​​the middle portion of the second hole 106.

[0054] A second hole 106 on one side extends along the extension line of a first hole 104 on the other side. A second hole 106 on the other side extends along the extension line of a first hole 104 on the other side. A first opening 110 faces a second opening 112. A connecting hole 108 connects the ends of the two first holes 104 to each other. The connecting hole 108 opens on a first side surface 80a.

[0055] exist Figure 2 and Figure 8 In this design, the anti-detachment member 26 extends in a linear shape. Specifically, the anti-detachment member 26 is a U-shaped clamp. The anti-detachment member 26 is formed by bending a metal rod into a U-shape. The anti-detachment member 26 prevents the mounting protrusion 69 from disengaging from the mounting hole 88 by being inserted into the insertion hole 102.

[0056] The anti-detachment component 26 includes two locking portions 114 and a connecting portion 116. The two locking portions 114 extend parallel to each other. The connecting portion 116 connects the ends of the two locking portions 114 to each other. Each locking portion 114 is arranged to span the first hole 104, the annular groove 78, and the second hole 106. The connecting portion 116 is located in the connecting hole 108.

[0057] Next, the installation sequence of the pressure gauge 14 to the fluid pressure device 12 will be explained. First, the user installs the adapter 24 onto the fluid pressure device 12 using two bolts 86. In this case, if the adapter 24 is installed onto the fluid pressure device 12 with its first side 80a facing the direction of gravity, the anti-detachment member 26 may fall off. In this embodiment, four through holes 84 are provided at each corner of the adapter body 79, so the user can install the adapter 24 onto the fluid pressure device 12 with its first side 80a not facing the direction of gravity.

[0058] Next, the mounting protrusion 69 is engaged with the mounting hole 88. Specifically, the mounting protrusion 69 and the mounting hole 88 have an engagement structure that allows the relative position of the mounting protrusion 69 and the adapter 24 in the circumferential direction centered on the axis Ax of the mounting protrusion 69 to be changed. Specifically, the orientation of the display surface 37, in which the mounting protrusion 69 is engaged with the mounting hole 88, can be changed at 45° intervals in the circumferential direction centered on the axis Ax of the mounting protrusion 69.

[0059] In other words, for example, such as Figure 1 As shown, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 facing the handle 18 in the protruding direction from the valve body 16. Additionally, for example, as... Figure 9A As shown, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 tilted at 45° relative to the direction in which the handle 18 protrudes from the valve body 16 in the circumferential direction centered on the axis Ax of the mounting protrusion 69. Furthermore, for example, as... Figure 9B As shown, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 tilted 90° relative to the direction in which the handle 18 protrudes from the valve body 16 in the circumferential direction centered on the axis Ax of the mounting protrusion 69. That is, the orientation of the display surface 37 can be easily changed to match the user's usage method.

[0060] After the mounting protrusion 69 is engaged with the mounting hole 88, the anti-detachment member 26 is inserted into the insertion hole 102 of the adapter 24. Specifically, as follows: Figure 8 As shown, the two locking portions 114 of the anti-detachment member 26 pass through the annular grooves 78 from the two first holes 104. Then, the front end of each locking portion 114 is inserted into the second opening 112. In this case, since the opening area of ​​the second opening 112 is larger than the cross-sectional area of ​​the second hole 106, each locking portion 114 is smoothly inserted into the second opening 112. Once the anti-detachment member 26 is inserted into the insertion hole 102, the installation of the pressure gauge 14 into the fluid pressure device 12 is complete.

[0061] The pressure gauge 14 in this embodiment has the following effects.

[0062] According to this embodiment, the display surface 37 faces a direction intersecting the axis Ax of the mounting protrusion 69. Furthermore, the mounting protrusion 69 and the mounting hole 88 have a fitting structure that allows for changing the relative position of the mounting protrusion 69 and the adapter 24 in the circumferential direction centered on the axis Ax of the mounting protrusion 69. Therefore, the orientation of the display surface 37 can be easily changed. Thus, the display surface 37 can be oriented in a direction easily visible to the eye, matching the user's usage method.

[0063] The adapter 24 has an inner mounting surface 90 surrounding the mounting hole 88. The mounting protrusion 69 has a polygonal outer mounting surface 76. The inner mounting surface 90 restricts the rotation of the mounting protrusion 69 relative to the adapter 24 about the axis Ax when the mounting protrusion 69 is engaged with the mounting hole 88.

[0064] With this structure, the orientation of the display surface 37 can be suppressed in the event that the user accidentally touches the pressure gauge 14.

[0065] The inner surface 90 is formed into a polygon.

[0066] Based on this structure, the rotation of the mounting protrusion 69 relative to the adapter 24 can be restricted in the mating state through a simple design.

[0067] The mounting protrusion 69 has a rotationally symmetric shape of 45° centered on the axis Ax of the mounting protrusion 69.

[0068] With this structure, the orientation of the display surface 37 can be changed at 45° intervals in the circumferential direction centered on the axis Ax of the mounting protrusion 69.

[0069] The mounting outer surface 76 is formed into an octagon. The mounting inner surface 90 has multiple planes that are opposite to the multiple planes 77 of the mounting outer surface 76 in the mating state.

[0070] Based on this structure, the orientation of the display surface 37 can be changed at 45° intervals in the circumferential direction centered on the axis Ax of the mounting protrusion 69 through a simple design.

[0071] The pressure gauge 14 includes a linear anti-disengagement member 26 to prevent the mounting protrusion 69 from disengaging from the mounting hole 88. The mounting outer surface 76 has an annular groove 78 extending circumferentially about the axis Ax of the mounting protrusion 69. The adapter 24 has an insertion hole 102 communicating with the annular groove 78 in the engaged state. The anti-disengagement member 26 is inserted across the insertion hole 102 and the annular groove 78.

[0072] With this structure, the mounting protrusion 69 can be prevented from dislodging from the mounting hole 88 by a simple design.

[0073] The adapter 24 has a first hole 104 and a second hole 106. The first hole 104 extends linearly from a first side 80a of the adapter 24 to a mounting inner surface 90. The second hole 106 is located on the extension line of the first hole 104 and extends linearly from the mounting inner surface 90. The second hole 106 opens into a second connecting plane 100b in the mounting inner surface 90, which extends in a direction inclined relative to the extending direction of the second hole 106. The anti-detachment member 26 is inserted across the first hole 104, the annular groove 78, and the second hole 106.

[0074] With this structure, the opening area of ​​the second opening 112 in the second hole 106, which opens into the second connecting plane 100b, can be larger than the cross-sectional area of ​​the second hole 106. Therefore, after the anti-detachment member 26 passes through the annular groove 78 from the first hole 104, its front end can be smoothly inserted into the second opening 112. Furthermore, even without chamfering the edge of the second opening 112, the opening area of ​​the second opening 112 can be increased, thus reducing the manufacturing cost of the adapter 24.

[0075] The fluid pressure system 10 can also be equipped with Figure 10 The pressure gauge 120 shown in the modified example replaces the pressure gauge 14 described above. In the modified example, the same reference numerals as in the above embodiment indicate the same structure. Furthermore, in the modified example, descriptions of structures identical to those in the above embodiment are omitted.

[0076] like Figure 10 As shown, the pressure gauge 120 includes a pressure gauge body 122, an adapter 124, and an anti-disengagement component 26. The pressure gauge body 122 includes a measuring section 28, a display section 30, and a housing 126. Figures 10-12 As shown, the fluid inlet 127 of the housing 126 has a mounting protrusion 128. The mounting protrusion 128 includes a circular (perfectly circular) mounting outer surface 130. An annular groove 78 is formed on the mounting outer surface 130.

[0077] like Figure 10 as well as Figure 13 As shown, the adapter body 125 of the adapter 124 has a mounting hole 132 for the mounting protrusion 128 to engage. The adapter 124 includes a mounting inner surface 134 surrounding the mounting hole 132. The mounting inner surface 134 is circular (perfectly circular). The mounting inner surface 134 faces the mounting outer surface 130 when the mounting protrusion 128 is engaged in the mounting hole 132. In the engaged state, the mounting inner surface 134 approaches or contacts the mounting outer surface 130 in a manner that allows it to rotate about the axis Ax of the mounting protrusion 128.

[0078] In this modified example, the adapter 124 has a circular inner mounting surface 134 surrounding the mounting hole 132. The mounting protrusion 128 has a circular outer mounting surface 130. When the mounting protrusion 128 is engaged with the mounting hole 132, the outer mounting surface 130 and the inner mounting surface 134 are opposite to each other.

[0079] With this structure, the orientation of the display surface 37 can be continuously changed in the circumferential direction centered on the axis Ax of the mounting protrusion 128. Therefore, the display surface 37 can be oriented in a direction that is easier to visually recognize, in accordance with the user's usage method.

[0080] When the mounting protrusion 128 is in the engaged state, it can rotate relative to the adapter 124 about the axis Ax of the mounting protrusion 128.

[0081] With this structure, the orientation of the display surface 37 can be adjusted when the mounting protrusion 128 is engaged with the mounting hole 132.

[0082] Furthermore, the present invention is not limited to the above-described embodiments, and various structures can be adopted without departing from the spirit of the present invention.

[0083] This embodiment discloses the following content.

[0084] The above embodiments disclose a pressure gauge (14, 120) comprising: a housing (32, 126) housing a measuring part (28) for measuring the pressure of a fluid; a display part (30) disposed in the housing and displaying the pressure measured by the measuring part; and an adapter (24, 124) mounted on a fluid pressure device (12), the adapter including a mounting hole (88, 132), the housing having a mounting protrusion (69, 128) capable of engaging with the mounting hole, the display part having a display surface (37) facing a direction intersecting the axis (Ax) of the mounting protrusion, the mounting protrusion and the mounting hole having an engagement structure capable of changing the relative position of the mounting protrusion and the adapter in the circumferential direction centered on the axis of the mounting protrusion.

[0085] In the pressure gauge described above, the adapter may also have an inner mounting surface (90) surrounding the mounting hole, and the mounting protrusion may have a polygonal outer mounting surface (76). The inner mounting surface restricts the rotation of the mounting protrusion relative to the adapter about the axis when the mounting protrusion is engaged with the mounting hole.

[0086] In the aforementioned pressure gauge, the mounting inner surface may also be formed as a polygon.

[0087] In the aforementioned pressure gauge, the mounting protrusion may also have a rotationally symmetrical shape with the axis of the mounting protrusion at a 45° angle.

[0088] In the pressure gauge described above, the outer mounting surface may be formed as an octagon, and the inner mounting surface may have multiple planes that are opposite to the multiple planes (77) of the outer mounting surface in the fitted state.

[0089] In the pressure gauge described above, the adapter may also have a circular inner mounting surface (134) surrounding the mounting hole, and the mounting protrusion may have a circular outer mounting surface (130), with the inner mounting surface facing the outer mounting surface in the engaged state where the mounting protrusion engages with the mounting hole.

[0090] In the pressure gauge described above, the mounting protrusion may also be able to rotate relative to the adapter about its axis in the engaged state.

[0091] In the aforementioned pressure gauge, the pressure gauge may also include a linear anti-disengagement member (26) for preventing the mounting protrusion from disengaging from the mounting hole, the mounting outer surface having an annular groove (78) extending circumferentially along the axis of the mounting protrusion, the adapter having an insertion hole (102) communicating with the annular groove in the engaged state, and the anti-disengagement member being inserted across the insertion hole and the annular groove.

[0092] In the aforementioned pressure gauge, the pressure gauge may also include a linear anti-disengagement member for preventing the mounting protrusion from disengaging from the mounting hole. The outer mounting surface has an annular groove extending circumferentially along the axis of the mounting protrusion. The adapter has a first hole (104) and a second hole (106). The first hole extends linearly from the outer surface (80a) of the adapter to the inner mounting surface. The second hole is located on the extension line of the first hole and extends linearly from the inner mounting surface. The second hole opens into a plane (100b) in the inner mounting surface that extends in a direction inclined relative to the extension direction of the second hole. The anti-disengagement member is inserted across the first hole, the annular groove, and the second hole.

[0093] The above embodiments disclose a fluid pressure system (10) which includes a fluid pressure device and a pressure gauge installed on the fluid pressure device, wherein the pressure gauge is the aforementioned pressure gauge.

Claims

1. A pressure gauge (14, 120) comprising: a housing (32, 126) housing a measuring section (28) for measuring the pressure of a fluid; a display section (30) disposed in the housing and displaying the pressure measured by the measuring section; and an adapter (24, 124) mounted on a fluid pressure device (12), characterized in that, The adapter includes mounting holes (88, 132). The housing has mounting protrusions (69, 128) that can engage with the mounting holes. The display unit has a display surface (37) facing a direction that intersects the axis (Ax) of the mounting protrusion. The mounting protrusion and the mounting hole have a fitting structure that allows for changing the relative position of the mounting protrusion and the adapter in the circumferential direction centered on the axis of the mounting protrusion. The adapter has a mounting inner surface (90) surrounding the mounting hole. The mounting protrusion has a polygonal mounting outer surface (76). The mounting inner surface restricts the rotation of the mounting protrusion relative to the adapter about the axis when the mounting protrusion is engaged with the mounting hole.

2. The pressure gauge according to claim 1, characterized in that, The mounting inner surface is formed as a polygon.

3. The pressure gauge according to claim 2, characterized in that, The mounting protrusion has a rotationally symmetrical shape of 45° about the axis of the mounting protrusion.

4. The pressure gauge according to claim 3, characterized in that, The mounting outer surface is formed into an octagon. The inner mounting surface has multiple planes that are opposite to multiple planes (77) of the outer mounting surface in the mating state.

5. The pressure gauge according to any one of claims 1 to 4, characterized in that, The pressure gauge includes a linear anti-disengagement member (26) for preventing the mounting protrusion from disengaging from the mounting hole. The mounting outer surface has an annular groove (78) extending circumferentially along the axis of the mounting protrusion. The adapter has an insertion hole (102) that communicates with the annular groove in the engaged state. The anti-detachment component is inserted in a manner that spans the insertion hole and the annular groove.

6. The pressure gauge according to claim 4, characterized in that, The pressure gauge includes a linear anti-detachment member to prevent the mounting protrusion from dislodging from the mounting hole. The mounting outer surface has an annular groove extending circumferentially along the axis of the mounting protrusion. The adapter has a first hole (104) and a second hole (106), the first hole extending linearly from the outer surface (80a) of the adapter to the inner mounting surface, and the second hole located on the extension line of the first hole and extending linearly from the inner mounting surface. The second hole opens into a plane (100b) in the inner surface of the mounting surface in a direction inclined relative to the extension direction of the second hole. The anti-detachment component is inserted in a manner that spans the first hole, the annular groove, and the second hole.

7. A fluid pressure system (10) comprising a fluid pressure device and a pressure gauge mounted on the fluid pressure device, The pressure gauge is the pressure gauge according to any one of claims 1 to 6.

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