Pressure Gauges and Fluid Pressure Systems

Abstract

To change the direction of the display surface in accordance with a use method of a user when a pressure gauge is attached to fluid pressure equipment.SOLUTION: A fluid pressure system includes: fluid pressure equipment; and a pressure gauge 14 attached to the fluid pressure equipment. The pressure gauge 14 includes: a measurement part 28; a case 32; a display part 30; and an adapter 24. The adapter 24 includes a mounting hole 88. The case 32 includes a mounting protrusion 69 which can be fitted into the mounting hole 88. The display part 30 has a display surface 37 facing in the direction intersecting with an axis of the mounting protrusion 69. The mounting protrusion 69 and the mounting hole 88 have a fitting structure capable of changing a relative position between the mounting protrusion 69 and the adapter 24 in the circumferential direction around the axis of the mounting protrusion 69.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to pressure gauges and fluid pressure systems. [Background technology]

[0002] For example, Patent Document 1 discloses a pressure gauge that can be attached to a fluid pressure device. This pressure gauge includes a case that houses a measuring unit that measures the pressure of the fluid, and a display unit that is attached to the case. The case is fixed to the fluid pressure device by a screw member. The display unit has a display surface that faces in the axial direction of the screw member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-206262 Summary of the Invention [Problem to be solved by the invention]

[0004] In the pressure gauge described above, the orientation of the display surface cannot be changed when the pressure gauge is attached to a fluid pressure device. Therefore, depending on how the user uses the pressure gauge, the display surface of the pressure gauge may be oriented in a direction that makes it difficult to view.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] One aspect of the present invention is a pressure gauge comprising a case that houses a measuring unit that measures the pressure of a fluid, a display unit that is provided in the case and displays the pressure measured by the measuring unit, and an adapter that is attached to a fluid pressure device, wherein the adapter includes a mounting hole, the case has a mounting protrusion that can be fitted into the mounting hole, the display unit has a display surface that faces in a direction that intersects with the axis of the mounting protrusion, and the mounting protrusion and the mounting hole have an engagement structure that can change the relative position of the mounting protrusion and the adapter in a circumferential direction centered on the axis of the mounting protrusion.

[0007] Another aspect of the present invention is a fluid pressure system including a fluid pressure device and a pressure gauge attached to the fluid pressure device, wherein the pressure gauge is the pressure gauge described above. [Effects of the Invention]

[0008] According to the present invention, the display surface faces in a direction intersecting the axis of the mounting protrusion. Furthermore, the mounting protrusion and the mounting hole have a fitting structure that allows the relative position of the mounting protrusion and the adapter to be changed in the circumferential direction centered on the axis of the mounting protrusion. Therefore, the orientation of the display surface can be easily changed. Therefore, the display surface can be oriented in a direction that is easy to view, depending on the user's usage method. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a fluid pressure system according to one embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the pressure gauge of FIG. [Figure 3] FIG. 3 is a longitudinal cross-sectional view of the pressure gauge of FIG. [Figure 4] FIG. 4 is a vertical cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a front view of the pressure gauge body of FIG. [Figure 6] FIG. 6 is a bottom view of the pressure gauge body of FIG. [Figure 7]7 is a cross-sectional view of the adapter of FIG. 2. FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] Fig. 9A is a perspective view of a fluid pressure system according to a first example in which the orientation of the display surface of the pressure gauge in Fig. 1 is changed. Fig. 9B is a perspective view of a fluid pressure system according to a second example in which the orientation of the display surface of the pressure gauge in Fig. 1 is changed. [Figure 10] FIG. 10 is an exploded perspective view of a pressure gauge according to a modified example. [Figure 11] FIG. 11 is a front view of the pressure gauge body of FIG. [Figure 12] FIG. 12 is a bottom view of the pressure gauge body of FIG. [Figure 13] FIG. 13 is a cross-sectional view of the pressure gauge of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1, a fluid pressure system 10 according to one embodiment of the present invention includes a fluid pressure device 12 and a pressure gauge 14 attached to 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.

[0011] The valve body 16 is formed in a rectangular parallelepiped shape. A rotatable handle 18 is attached to the valve body 16. The valve body 16 has a plurality of ports 20 through which fluid flows. The plurality of ports 20 include an input port and an output port. A pressure gauge 14 is attached to the outer surface of the valve body 16 facing in a direction perpendicular to the axial direction of the handle 18. The handle 18 adjusts the set pressure of the fluid delivered from the fluid pressure device 12. The fluid pressure device 12 to which the pressure gauge 14 is attached is not limited to a regulator.

[0012] 2, the pressure gauge 14 includes a pressure gauge main body 22, an adapter 24, and a retaining member 26. The pressure gauge main body 22 has a measuring unit 28, a display unit 30, and a case 32. The measuring unit 28 measures the pressure of the fluid. The display unit 30 displays the pressure measured by the measuring unit 28.

[0013] 2 and 3, the display unit 30 includes a display main body 34 and a cover 36. The display main body 34 is a square plate-like portion. A display surface 37 is provided on one surface of the display main body 34. A scale (not shown) is provided on the display surface 37. A rotatable pointer 38 is attached to the center of the display surface 37. A measuring unit 28 is attached to the other surface of the display main body 34.

[0014] 2, the display main body 34 has two insertion holes 40. The two insertion holes 40 are located at diagonally opposite corners of the display main body 34. A bolt 41 for attaching the display main body 34 to the case 32 is inserted through each insertion hole 40.

[0015] The cover 36 is attached to one surface of the display body 34. The cover 36 includes a frame portion 42 that covers the outer periphery of the display surface 37 of the display body 34, and a transparent portion 44 that covers the display surface 37.

[0016] 2 to 4, the case 32 is a one-piece molded product made of a resin material. The case 32 has a hollow case body 46, a fluid introduction portion 48, and a plurality of reinforcing ribs 52. The case body 46 includes a rectangular cylindrical peripheral wall portion 54 and end wall portions 56 (see FIG. 3). The peripheral wall portion 54 extends in one direction.

[0017] In the following description, the extension direction of the peripheral wall portion 54 will be referred to as the arrow X direction, the width direction of the peripheral wall portion 54 will be referred to as the arrow Y direction, and the height direction of the peripheral wall portion 54 will be referred to as the arrow Z direction. The arrow Z direction is along the thickness direction of the plate-shaped adapter 24.

[0018] The cross-sectional shape of the outer surface of the peripheral wall portion 54 is approximately square (see FIG. 4). In FIGS. 2 and 3, one end (the end in the direction of arrow X1) of the peripheral wall portion 54 has a mounting surface 58 to which the display unit 30 is attached. The mounting surface 58 is a flat surface facing the direction of arrow X1. The outer shape of the mounting surface 58 is square. In other words, the outer shape of the mounting surface 58 is the same as the outer shape of the display main body 34. Furthermore, the outer size of the mounting surface 58 is the same as the outer size of the display main body 34. A hole 60 is formed in the mounting surface 58 for inserting the measurement unit 28 into the internal space S of the peripheral wall portion 54.

[0019] 4, each of the four corners of the inner surface of the peripheral wall portion 54 includes a bulge portion 62 that bulges inward of the peripheral wall portion 54. A nut 64 onto which a bolt 41 for fixing the display unit 30 to the case body 46 is threaded is insert-molded into each bulge portion 62.

[0020] 2, the display unit 30 is attached to the case 32 by threading two bolts 41 inserted into two insertion holes 40 of the display main body 34 onto two nuts 64. The display unit 30 can be attached to the case 32 so that the relative position between the display unit 30 and the peripheral wall portion 54 in the circumferential direction centered on the rotation axis of the pointer 38 can be changed. In other words, the display unit 30 can be attached to the case 32 so that the orientation of the upper end surface 35 of the display main body 34 can be changed.

[0021] Specifically, the display unit 30 can be attached to the case 32 so that the top surface 35 of the display main body 34 faces in the direction of arrow Z2. The display unit 30 can also be attached to the case 32 so that the top surface 35 of the display main body 34 faces in the direction of arrow Y1. The display unit 30 can also be attached to the case 32 so that the top surface 35 of the display main body 34 faces in the direction of arrow Z1. The display unit 30 can also be attached to the case 32 so that the top surface 35 of the display main body 34 faces in the direction of arrow Y2. This allows the orientation of the top surface 35 of the display main body 34 to be changed depending on how the user intends to use the display unit 30 when attaching it to the case 32.

[0022] 3, the end wall portion 56 is located at the other end (in the direction of the arrow X2) of the peripheral wall portion 54. The end wall portion 56 covers the internal space S of the peripheral wall portion 54 from the direction of the arrow X2.

[0023] 3 and 4, the fluid introduction section 48 has an introduction flow path 66 formed therein for introducing the fluid from the fluid pressure device 12 to the measuring section 28. The fluid introduction section 48 includes an attachment protrusion 69, a first introduction pipe section 70, a second introduction pipe section 72, and a connection pipe section 74. The attachment protrusion 69 protrudes outward (in the direction of arrow Z1) from a support wall section 68 located on the peripheral wall section 54 in a direction perpendicular to the rotation axis of the pointer 38 (in the direction of arrow Z1).

[0024] The first introduction pipe portion 70 extends in the direction of arrow Z1 from the protruding end face of the mounting protrusion 69. The extending end portion of the first introduction pipe portion 70 is inserted into the valve body 16 with the pressure gauge 14 attached to the fluid pressure device 12.

[0025] The second introduction pipe 72 extends from the support wall 68 in the opposite direction (the direction of arrow Z2) to the extension direction of the first introduction pipe 70. The second introduction pipe 72 extends into the internal space S of the peripheral wall 54. The inner hole of the second introduction pipe 72 communicates with the inner hole of the first introduction pipe 70. The second introduction pipe 72 is connected to the inner surface of the end wall 56 (see FIG. 3).

[0026] The connecting pipe 74 protrudes in the direction of arrow X1 from the inner surface of the end wall 56 towards the measuring unit 28. The extending end of the second introduction pipe 72 is connected to the connecting pipe 74. The inner hole of the connecting pipe 74 communicates with the inner hole of the second introduction pipe 72. The protruding end of the connecting pipe 74 is airtightly connected to the measuring unit 28.

[0027] 3, the display surface 37 of the display unit 30 faces in a direction intersecting the axis Ax of the mounting protrusion 69. In other words, the display surface 37 of the display unit 30 faces in a direction perpendicular to the axis Ax of the mounting protrusion 69. An introduction flow path 66 is provided in the mounting protrusion 69 (see FIGS. 3 and 4).

[0028] As shown in FIG. 6, the mounting protrusion 69 has a polygonal outer mounting surface 76. In other words, the mounting protrusion 69 has an octagonal outer mounting surface 76. Specifically, the outer mounting surface 76 is formed in a regular octagonal shape when viewed from the direction of arrow Z1. That is, the outer mounting surface 76 has eight flat surfaces 77. The mounting protrusion 69 has a shape rotationally symmetrical at 45° about the axis Ax of the mounting protrusion 69. An annular groove 78 extending in the circumferential direction centered on the axis Ax of the mounting protrusion 69 is formed in the middle part of the outer mounting surface 76 in the direction of arrow Z (see FIGS. 3 to 5).

[0029] The multiple reinforcing ribs 52 extend from the protruding end surface of the mounting protrusion 69 toward the extending end of the first introduction pipe portion 70. In this embodiment, the case 32 has eight reinforcing ribs 52. These reinforcing ribs 52 are connected to multiple corners of the mounting outer surface 76, respectively. 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 set as appropriate.

[0030] As shown in FIG. 2, the adapter 24 includes a rectangular plate-shaped adapter body 79 and a protrusion 81. Specifically, the adapter body 79 is formed in a square shape. The adapter body 79 has a first side surface 80a, a second side surface 80b, a third side surface 80c, and a fourth side surface 80d. The first side surface 80a and the second side surface 80b extend in the same direction. The third side surface 80c and the fourth side surface 80d extend in a direction perpendicular to the extension direction of the first side surface 80a and the second side surface 80b.

[0031] The adapter body 79 has four insertion holes 84. The four insertion holes 84 are located at four corners of the adapter body 79. When viewed in the thickness direction, the adapter body 79 has a shape that is rotationally symmetrical by 90° about the center line of the adapter body 79. Bolts 86 for attaching the adapter 24 to the fluid pressure device 12 are inserted into two of the four insertion holes 84 that are located at diagonal corners.

[0032] The protrusion 81 protrudes in the thickness direction from one surface of the adapter body 79. The protrusion 81 extends in an annular shape.

[0033] 7 and 8, a mounting hole 88 into which the mounting protrusion 69 can be fitted is formed in the center of the adapter body 79. The adapter body 79 includes an inner mounting surface 90 that surrounds the mounting hole 88. The inner mounting surface 90 is formed in a polygonal shape. When the mounting protrusion 69 is fitted into the mounting hole 88, the inner mounting surface 90 is in close proximity to or in contact with the outer mounting surface 76 so as to restrict rotation of the mounting protrusion 69 about the axis Ax (see FIG. 8). The inner mounting surface 90 has two first flat surfaces 92, two second flat surfaces 94, and four connecting surfaces 96.

[0034] Each first flat surface 92 extends along the extension direction of the first side surface 80a and the second side surface 80b of the adapter 24. The two first flat surfaces 92 are positioned to face each other. The length of each first flat surface 92 along the extension direction is longer than the width of each flat surface 77 of the outer mounting surface 76. The lengths of the two first flat surfaces 92 along the extension direction are the same.

[0035] Each second flat surface 94 extends along the extension direction of the third side surface 80c and the fourth side surface 80d of the adapter 24. In other words, each second flat surface 94 extends in a direction perpendicular to the extension direction of each first flat surface 92. The two second flat surfaces 94 are positioned opposite each other. The length of each second flat surface 94 along the extension direction is shorter than the length of each first flat surface 92 along the extension direction. The lengths of the two second flat surfaces 94 along the extension direction are the same.

[0036] The four connecting surfaces 96 connect the end of the first flat surface 92 to the end of the second flat surface 94. Each connecting surface 96 has a first connecting flat surface 98 and a second connecting flat surface 100. The first connecting flat surface 98 extends from the end of the first flat surface 92 toward the mounting hole 88. The first connecting flat surface 98 extends in the same direction as the second flat surface 94.

[0037] The second connecting plane 100 extends from the extending 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 direction of the first plane 92 and the extending direction of the second plane 94. The length of the second connecting plane 100 along the extending direction is shorter than the length of the second plane 94 along the extending direction. The length of the second connecting plane 100 along the extending direction is shorter than the width of each plane 77 of the outer mounting surface 76 (see FIG. 8).

[0038] 8, in the fitted state where the mounting protrusion 69 is fitted into the mounting hole 88, the eight flat surfaces 77 of the mounting protrusion 69 face two first flat surfaces 92, two second flat surfaces 94, and four second connecting flat surfaces 100. In other words, in the fitted state, the four first connecting flat surfaces 98 are spaced apart from the outer mounting surface 76.

[0039] In the following description, of the four second connecting planes 100, two second connecting planes 100 extending from the second plane 94 toward the first side surface 80a may be referred to as "second connecting planes 100a." Furthermore, of the four second connecting planes 100, two second connecting planes 100 extending from the second plane 94 toward the second side surface 80b may be referred to as "second connecting planes 100b."

[0040] The adapter 24 is formed with an insertion hole 102 into which the retaining member 26 is inserted. The insertion hole 102 includes two first holes 104, two second holes 106, and a communication hole 108. The two first holes 104 extend linearly from the first side surface 80a to the two second connecting flat surfaces 100a along the extension 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 opens to the first side surface 80a. Each first hole 104 has a first opening 110 that opens to the second connecting flat surface 100a.

[0041] The two second holes 106 extend linearly from the second side surface 80b to the two second connecting planes 100b along the extension direction of the third side surface 80c and the fourth side surface 80d. 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 to the second side surface 80b. Each second hole 106 has a second opening 112 that opens to the second connecting plane 100b. Each second connecting plane 100b is inclined with respect to the extension direction of the second holes 106. Therefore, the opening area of ​​the second opening 112 is larger than the cross-sectional area of ​​the intermediate portion of the second hole 106.

[0042] One of the second holes 106 extends on an extension of one of the first holes 104. The other second hole 106 extends on an extension of the other of the first holes 104. The first opening 110 faces the second opening 112. The communication hole 108 connects the ends of the two first holes 104 to each other. The communication hole 108 opens to the first side surface 80a.

[0043] 2 and 8, the retaining member 26 extends linearly. Specifically, the retaining member 26 is a clip formed in a U-shape. The retaining member 26 is formed by bending a metal rod into a U-shape. When the retaining member 26 is inserted into the insertion hole 102, it prevents the mounting protrusion 69 from coming out of the mounting hole 88.

[0044] The retaining member 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 positioned so as to straddle the first hole 104, the annular groove 78, and the second hole 106. The connecting portion 116 is positioned in the communicating hole 108.

[0045] Next, the procedure for attaching the pressure gauge 14 to the fluid pressure device 12 will be described. First, the user attaches the adapter 24 to the fluid pressure device 12 with the two bolts 86. In this case, if the adapter 24 is attached to the fluid pressure device 12 so that the first side surface 80a faces the direction of gravity, there is a possibility that the retaining member 26 will fall off. In this embodiment, the four insertion holes 84 are provided at each corner of the adapter body 79, so the user can attach the adapter 24 to the fluid pressure device 12 so that the first side surface 80a does not face the direction of gravity.

[0046] Thereafter, the mounting protrusion 69 is fitted into the mounting hole 88. Specifically, the mounting protrusion 69 and the mounting hole 88 have a fitting structure that allows the relative position of the mounting protrusion 69 and the adapter 24 to be changed in the circumferential direction centered on the axis Ax of the mounting protrusion 69. Specifically, the orientation of the display surface 37 when the mounting protrusion 69 is fitted into the mounting hole 88 can be changed in 45° intervals in the circumferential direction centered on the axis Ax of the mounting protrusion 69.

[0047] That is, for example, as shown in Fig. 1, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 facing in the direction in which the handle 18 protrudes from the valve body 16. Also, for example, as shown in Fig. 9A, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 facing in a direction tilted at 45° in the circumferential direction about the axis Ax of the mounting protrusion 69 with respect to the direction in which the handle 18 protrudes from the valve body 16. Furthermore, for example, as shown in Fig. 9B, the mounting protrusion 69 can be fitted into the mounting hole 88 with the display surface 37 facing in a direction tilted at 90° in the circumferential direction about the axis Ax of the mounting protrusion 69 with respect to the direction in which the handle 18 protrudes from the valve body 16. That is, the orientation of the display surface 37 can be easily changed to suit the user's usage method.

[0048] After the mounting protrusion 69 is fitted into the mounting hole 88, the retaining member 26 is inserted into the insertion hole 102 of the adapter 24. Specifically, as shown in FIG. 8 , the two locking portions 114 of the retaining member 26 are passed through the two first holes 104 and into the annular groove 78. Then, the tip end of each locking portion 114 is inserted into the second opening 112. In this case, because 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 insertion of the retaining member 26 into the insertion hole 102 is complete, the attachment of the pressure gauge 14 to the fluid pressure device 12 is complete.

[0049] The pressure gauge 14 according to this embodiment has the following advantages.

[0050] According to this embodiment, the display surface 37 faces in 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 the relative position of the mounting protrusion 69 and the adapter 24 to be changed in the circumferential direction centered on the axis Ax of the mounting protrusion 69. This makes it possible to easily change the orientation of the display surface 37. Therefore, the display surface 37 can be oriented in a direction that is easy to view, depending on the user's usage method.

[0051] The adapter 24 has an inner mounting surface 90 that surrounds the mounting hole 88. The mounting protrusion 69 has a polygonal outer mounting surface 76. The inner mounting surface 90 restricts rotation of the mounting protrusion 69 relative to the adapter 24 about the axis Ax when the mounting protrusion 69 is fitted into the mounting hole 88.

[0052] With this configuration, even if the user unintentionally touches the pressure gauge 14, it is possible to prevent the orientation of the display surface 37 from changing.

[0053] The inner mounting surface 90 is formed in a polygonal shape.

[0054] According to this configuration, the mounting projection 69 can be restricted from rotating relative to the adapter 24 in the fitted state with a simple structure.

[0055] The mounting protrusion 69 has a shape that is rotationally symmetrical at 45° about the axis Ax of the mounting protrusion 69 .

[0056] With this configuration, the orientation of the display surface 37 can be changed at intervals of 45° in the circumferential direction around the axis Ax of the mounting protrusion 69.

[0057] The outer mounting surface 76 is formed in an octagonal shape. The inner mounting surface 90 has a plurality of flat surfaces that face the plurality of flat surfaces 77 of the outer mounting surface 76 in a mating state.

[0058] According to this simple configuration, the orientation of the display surface 37 can be changed at intervals of 45° in the circumferential direction around the axis Ax of the mounting protrusion 69.

[0059] The pressure gauge 14 is provided with a linear retaining member 26 for preventing the mounting protrusion 69 from slipping out of the mounting hole 88. The outer mounting 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 that communicates with the annular groove 78 in a fitted state. The retaining member 26 is inserted so as to straddle the insertion hole 102 and the annular groove 78.

[0060] According to this configuration, the mounting projection 69 can be prevented from slipping out of the mounting hole 88 with a simple configuration.

[0061] The adapter 24 has a first hole 104 and a second hole 106. The first hole 104 extends linearly from the first side surface 80a of the adapter 24 to the inner mounting surface 90. The second hole 106 is located on an extension line of the first hole 104 and extends linearly from the inner mounting surface 90. The second hole 106 opens into a second connecting plane 100b of the inner mounting surface 90 that extends in a direction inclined with the extension direction of the second hole 106. The retaining member 26 is inserted so as to straddle the first hole 104, the annular groove 78, and the second hole 106.

[0062] With this configuration, the opening area of ​​the second opening 112 of the second hole 106 that opens into the second connecting plane 100b can be made larger than the cross-sectional area of ​​the second hole 106. As a result, after the retaining member 26 has been passed through the first hole 104 and into the annular groove 78, the tip of the retaining member 26 can be smoothly inserted into the second opening 112. Furthermore, because the opening area of ​​the second opening 112 can be made larger without chamfering the edge of the second opening 112, the manufacturing costs of the adapter 24 can be reduced.

[0063] The fluid pressure system 10 may include a pressure gauge 120 according to a modified example shown in Fig. 10 instead of the pressure gauge 14 described above. In the modified example, the same reference numerals as those in the above-described embodiment indicate the same components. Furthermore, in the modified example, the same components as those in the above-described embodiment will not be described again.

[0064] As shown in Fig. 10, the pressure gauge 120 includes a pressure gauge main body 122, an adapter 124, and a retaining member 26. The pressure gauge main body 122 has a measuring section 28, a display section 30, and a case 126. As shown in Figs. 10 to 12, the fluid introduction section 127 of the case 126 has a mounting protrusion 128. The mounting protrusion 128 includes a circular (perfectly circular) outer mounting surface 130. An annular groove 78 is formed in the outer mounting surface 130.

[0065] 10 and 13, an attachment hole 132 into which the attachment protrusion 128 can be fitted is formed in the adapter body 125 of the adapter 124. The adapter 124 includes an attachment inner surface 134 that surrounds the attachment hole 132. The attachment inner surface 134 is formed in a circular shape (a perfect circle). In a fitted state in which the attachment protrusion 128 is fitted into the attachment hole 132, the attachment inner surface 134 faces the attachment outer surface 130. In a fitted state, the attachment inner surface 134 is in proximity to or in contact with the attachment outer surface 130 so as to be rotatable about the axis Ax of the attachment protrusion 128.

[0066] In this modification, the adapter 124 has a circular inner mounting surface 134 that surrounds the mounting hole 132. The mounting protrusion 128 has a circular outer mounting surface 130. When the mounting protrusion 128 is fitted into the mounting hole 132, the outer mounting surface 130 and the inner mounting surface 134 face each other.

[0067] With this configuration, the orientation of the display surface 37 can be continuously changed in the circumferential direction around the axis Ax of the mounting protrusion 128. Therefore, the display surface 37 can be oriented in a direction that is easier to view depending on the user's usage method.

[0068] The mounting protrusion 128 is rotatable relative to the adapter 124 around the axis Ax of the mounting protrusion 128 in the fitted state.

[0069] With this configuration, the orientation of the display surface 37 can be adjusted when the mounting protrusion 128 is fitted into the mounting hole 132 .

[0070] The present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

[0071] This embodiment discloses the following.

[0072] The above embodiment discloses a pressure gauge (14, 120) comprising a case (32, 126) that houses a measuring unit (28) that measures the pressure of a fluid, a display unit (30) that is provided in the case and that displays the pressure measured by the measuring unit, and an adapter (24, 124) that is attached to a fluid pressure device (12), wherein the adapter includes a mounting hole (88, 132), the case has a mounting protrusion (69, 128) that can be fitted into the mounting hole, the display unit has a display surface (37) that faces a direction that intersects with an axis (Ax) of the mounting protrusion, and the mounting protrusion and the mounting hole have an engagement structure that can change the relative position of the mounting protrusion and the adapter in the circumferential direction centered on the axis of the mounting protrusion.

[0073] In the above pressure gauge, the adapter may have an inner mounting surface (90) surrounding the mounting hole, and the mounting convex portion may have a polygonal outer mounting surface (76), and the inner mounting surface may restrict rotation of the mounting convex portion relative to the adapter about the axis when the mounting convex portion is fitted into the mounting hole.

[0074] In the above pressure gauge, the mounting inner surface may be formed in a polygonal shape.

[0075] In the above pressure gauge, the mounting protrusion may have a shape that is rotationally symmetric at 45° about the axis of the mounting protrusion.

[0076] In the above pressure gauge, the outer mounting surface may be formed in an octagonal shape, and the inner mounting surface may have a plurality of flat surfaces that face the plurality of flat surfaces (77) of the outer mounting surface in the fitted state.

[0077] In the above pressure gauge, the adapter may have a circular mounting inner surface (134) surrounding the mounting hole, and the mounting protrusion may have a circular mounting outer surface (130), and the mounting inner surface may face the mounting outer surface when the mounting protrusion is fitted into the mounting hole.

[0078] In the above pressure gauge, the mounting protrusion may be rotatable with respect to the adapter around the axis of the mounting protrusion in the fitted state.

[0079] In the above pressure gauge, the pressure gauge is provided with a linear anti-slip member (26) for preventing the mounting protrusion from slipping out of the mounting hole, the mounting outer surface has an annular groove (78) extending circumferentially around the axis of the mounting protrusion, the adapter has an insertion hole (102) communicating with the annular groove in the fitted state, and the anti-slip member may be inserted so as to straddle the insertion hole and the annular groove.

[0080] In the above pressure gauge, the pressure gauge is provided with a linear anti-slip member for preventing the mounting protrusion from slipping out of the mounting hole, the outer mounting surface has an annular groove extending circumferentially around the axis of the mounting protrusion, the adapter has a first hole (104) extending linearly from the outer surface (80a) of the adapter to the inner mounting surface, and a second hole (106) located on an extension of the first hole and extending linearly from the inner mounting surface, the second hole opening into a plane (100b) of the inner mounting surface extending in a direction inclined to the extension direction of the second hole, and the anti-slip member may be inserted so as to straddle the first hole, the annular groove, and the second hole.

[0081] The above embodiment discloses a fluid pressure system (10) including a fluid pressure device and a pressure gauge attached to the fluid pressure device, wherein the pressure gauge is the pressure gauge described above. [Explanation of symbols]

[0082] 10...Fluid pressure system 12...Fluid pressure equipment 14, 120... Pressure gauge 24, 124... Adapter 26...Prevention member 28...Measuring instrument 30...Display unit 32...Case 37...Display surface 69, 128...Mounting protrusions 76, 130...Outer mounting surface 77...Flat surface 78...Annular groove 88, 132...Mounting holes 90, 134...Inner mounting surface 102...Insertion hole 104...1st hole 106...2nd hole Ax…Axis line

Claims

1. A pressure gauge comprising: a case that houses a measuring unit that measures the pressure of a fluid; a display unit that is provided in the case and that displays the pressure measured by the measuring unit; and an adapter that is attached to a fluid pressure device, the adapter includes a mounting hole; the case includes a mounting protrusion that can be fitted into the mounting hole, the display portion has a display surface facing a direction intersecting an axis of the mounting protrusion, the mounting protrusion and the mounting hole have a fitting structure that allows a relative position between the mounting protrusion and the adapter to be changed in a circumferential direction about the axis of the mounting protrusion, The orientation of the display surface when the mounting protrusion is attached to the adapter can be changed in the circumferential direction, The adapter has an inner mounting surface surrounding the mounting hole, The mounting protrusion has a polygonal outer mounting surface, The mounting inner surface restricts rotation of the mounting protrusion about the axis relative to the adapter when the mounting protrusion is fitted into the mounting hole.

2. 2. The pressure gauge according to claim 1, The pressure gauge, wherein the mounting inner surface is formed in a polygonal shape.

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

4. 4. The pressure gauge according to claim 3, The outer mounting surface is formed in an octagonal shape, The pressure gauge, wherein the mounting inner surface has a plurality of flat surfaces that face the plurality of flat surfaces of the mounting outer surface in the fitted state.

5. A pressure meter comprising: a case that houses a measuring unit that measures the pressure of a fluid; a display unit that is provided in the case and displays the pressure measured by the measuring unit; and an adapter that can be attached to a fluid pressure device, the adapter includes a mounting hole; the case includes a mounting protrusion that can be fitted into the mounting hole, the display portion has a display surface facing a direction intersecting an axis of the mounting protrusion, the mounting protrusion and the mounting hole have a fitting structure that allows a relative position between the mounting protrusion and the adapter to be changed in a circumferential direction about the axis of the mounting protrusion, The adapter has a circular mounting inner surface surrounding the mounting hole, The mounting protrusion has a circular outer mounting surface, the inner mounting surface faces the outer mounting surface in a fitted state in which the mounting protrusion is fitted into the mounting hole, the pressure gauge includes a linear retaining member for preventing the mounting protrusion from coming out of the mounting hole; the outer mounting surface has an annular groove extending in a circumferential direction of the axis of the mounting protrusion, the adapter has an insertion hole that communicates with the annular groove in the fitted state, The retaining member is inserted so as to straddle the insertion hole and the annular groove.

6. 6. The pressure gauge according to claim 5, The mounting protrusion is rotatable relative to the adapter around the axis of the mounting protrusion in the fitted state.

7. The pressure gauge according to any one of claims 1 to 4, the pressure gauge includes a linear retaining member for preventing the mounting protrusion from coming out of the mounting hole; the outer mounting surface has an annular groove extending in a circumferential direction of the axis of the mounting protrusion, the adapter has an insertion hole that communicates with the annular groove in the fitted state, The retaining member is inserted so as to straddle the insertion hole and the annular groove.

8. 5. The pressure gauge according to claim 4, the pressure gauge includes a linear retaining member for preventing the mounting protrusion from coming out of the mounting hole; the outer mounting surface has an annular groove extending in a circumferential direction of the axis of the mounting protrusion, The adapter is a first hole extending linearly from an outer surface of the adapter to the mounting inner surface; a second hole positioned on an extension line of the first hole and extending linearly from the mounting inner surface, the second hole opens onto a plane of the mounting inner surface that extends in a direction inclined with respect to the extension direction of the second hole, The retaining member is inserted so as to straddle the first hole, the annular groove, and the second hole.

9. a fluid pressure device; A fluid pressure system comprising: a pressure gauge attached to the fluid pressure device, A fluid pressure system, wherein the pressure gauge is a pressure gauge according to any one of claims 1 to 8.

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