Physical quantity measuring device

Abstract

To provide a physical quantity measuring device capable of improving sealing properties of a case member.SOLUTION: A physical quantity measuring device includes: a fluid introduction member formed with a fluid introduction hole for introducing fluid to be measured; a measuring part for measuring a physical quantity of the fluid to be measured which is introduced through the fluid introduction member; a case member 4 that is formed in a cylinder with a bottom for storing the measuring part; a lid member 5 that covers an opening of the case member 4; and a sealing member 6 that is interposed between the case member 4 and the lid member 5 for sealing between the case member 4 and the lid member 5. The sealing member 6 has a cylindrical sealing member main body 61 a first projection 62 and a second projection 63 each protruding from an outer peripheral surface of the sealing member main body 61 facing the case member 4 toward the case member 4.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a physical quantity measuring device. [Background technology]

[0002] Conventionally, pressure gauges equipped with a Bourdon tube are known (for example, Patent Document 1, etc.). In Patent Document 1, a glycerin liquid is sealed inside a case that houses the Bourdon tube. The shape of the damper cup attached to the pinion gear shaft is designed so that the tip widens in the counterclockwise direction. As a result, in Patent Document 1, when the pinion gear shaft rotates counterclockwise during decompression, the resistance of the damper cup to the sealed glycerin liquid increases, which reduces the movement of the indicator needle and makes it easier to read the indicator needle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Public Disclosure of Practical Use No. 1978-96878 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a screw cap is screwed onto a case, and a window glass and a ring packing are attached to seal the inside of the case, which contains glycerin liquid. In this structure, the seal between the case and the window glass is ensured by the force pressing the window glass and the ring packing against the case, such as when the screw cap is screwed in. Therefore, if the screw cap is not screwed in completely due to low manufacturing precision of the case, or if the screw cap becomes loose, the force pressing the window glass against the case weakens, which can lead to a problem of reduced seal between the case and the window glass.

[0005] An object of the present invention is to provide a physical quantity measuring device capable of improving the sealing performance of a case member. [Means for solving the problem]

[0006] The physical quantity measuring device of the present invention comprises a fluid introduction member having a fluid introduction hole through which a fluid to be measured is introduced, a measuring unit that measures the physical quantity of the fluid to be measured introduced through the fluid introduction member, a case member formed in a cylindrical shape with a bottom and that houses the measuring unit, a lid member that covers an opening of the case member, and a sealing member interposed between the case member and the lid member and that seals the space between the case member and the lid member, wherein the sealing member has a ring-shaped sealing member main body and a plurality of protrusions that protrude from an outer peripheral surface of the sealing member main body that faces the case member or the lid member toward the case member or the lid member.

[0007] In the present invention, a sealing member interposed between a case member housing a measuring unit that measures a physical quantity of a fluid to be measured and a lid member that covers an opening of the case member has a plurality of protrusions that protrude toward the case member or the lid member from the outer peripheral surface of the annular sealing member main body that faces the case member or the lid member. As a result, the sealing member seals the gap between the case member and the lid member with the plurality of protrusions, so even if the sealing by one protrusion is incomplete, it can be covered by the sealing by the other protrusions. Therefore, even if the manufacturing precision of the case member is low, the sealing performance between the case member and the lid member can be improved. Furthermore, in the present invention, the protruding portion protrudes toward the case member or lid member from the outer peripheral surface of the sealing member main body that faces the case member or lid member, i.e., the protruding portion abuts against the inner peripheral surface of the case member or lid member to form a seal, so that the sealing member is not affected by the pressing force of the lid member. Therefore, even if the lid member becomes loose relative to the case member, a decrease in sealing performance can be suppressed.

[0008] In the physical quantity measuring device of the present invention, it is preferable that the case member or the cover member has a housing groove for housing the sealing member main body. In this configuration, the case member or the lid member is provided with a storage groove for storing the sealing member main body, so that the sealing member main body can be stored in the storage groove, thereby preventing the sealing member from shifting position and thereby reducing the deterioration of sealing performance.

[0009] In the physical quantity measuring device of the present invention, it is preferable that the protrusion portion has a first protrusion portion and a second protrusion portion, and that the first protrusion portion and the second protrusion portion have the same dimensions in the direction protruding from the outer peripheral surface of the sealing member main body portion toward the case member or the lid member. In this configuration, the first protrusion portion and the second protrusion portion have the same dimensions in the protruding direction, so that it is possible to prevent the sealing ability of the first protrusion portion or the second protrusion portion from being reduced due to differences in dimensions.

[0010] In the physical quantity measuring device of the present invention, it is preferable that, when viewed from the side, a bottom surface portion is formed on the outer peripheral surface of the sealing member main body between the first protrusion portion and the second protrusion portion, along a direction perpendicular to the direction in which the first protrusion portion and the second protrusion portion protrude. In this configuration, the outer peripheral surface of the sealing member main body has a bottom surface that extends in a direction perpendicular to the direction in which the first and second protruding portions protrude, so that when the sealing member is interposed between the case member and the lid member, the first or second protruding portion can bend in a direction perpendicular to the direction in which the first or second protruding portion protrudes, toward the bottom surface of the sealing member main body. Therefore, the first or second protruding portion is interposed between the case member and the lid member in a bent state, i.e., no gap is created between the first or second protruding portion and the case member or the lid member, thereby improving the sealing performance between the case member and the lid member.

[0011] In the physical quantity measuring device of the present invention, a dimension between a tip end of the first protrusion and a tip end of the second protrusion in a direction perpendicular to a direction in which the first protrusion and the second protrusion are protruding is larger than a dimension of the first protrusion and the second protrusion in a direction in which the first protrusion and the second protrusion are protruding from an outer peripheral surface of the sealing member main body toward the case member or the lid member, as viewed from a side. Characterized by . In this configuration, the dimension between the tip of the first protrusion and the tip of the second protrusion in a direction perpendicular to the direction in which the first protrusion and the second protrusion on the bottom surface are greater than the dimension in the direction in which the first protrusion and the second protrusion are formed, so that when the first protrusion or the second protrusion is bent and inserted between the case member and the cover member, the dimension in which the first protrusion or the second protrusion is bent can be ensured, thereby preventing the first protrusion and the second protrusion from interfering with each other and reducing the sealing performance. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing an outline of a physical quantity measuring device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view showing an outline of the physical quantity measuring device according to the embodiment. [Figure 3] FIG. 2 is an enlarged cross-sectional view showing a main part of the physical quantity measuring device according to the embodiment. [Figure 4] FIG. 4 is a side view showing an outline of a sealing member. [Figure 5] FIG. 3 is a perspective view showing an outline of a sealing member. [Figure 6] FIG. 4 is an enlarged side view showing an outline of a main part of the sealing member. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Embodiment] A physical quantity measuring device 1 according to one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an outline of a physical quantity measuring device 1 of this embodiment, Fig. 2 is a cross-sectional view showing an outline of the physical quantity measuring device 1, and Fig. 3 is an enlarged cross-sectional view showing a main part of the physical quantity measuring device 1. The physical quantity measuring device 1 of the present invention is configured as a Bourdon tube type pressure measuring device. As shown in FIGS. 1 to 3, the physical quantity measuring device 1 includes a fluid introducing member 2, a measuring section 3, a case member 4, a cover member 5, a sealing member 6, a pointer 7, and a scale plate 8.

[0014] [Fluid introduction member 2] The fluid introducing member 2 is a so-called coupling member that is attached to a mounting portion such as a pipe (not shown) and is made of a metal material such as brass, stainless steel, steel, etc. The fluid introducing member 2 includes a main body 21 and a male thread portion 22 provided at the tip of the main body 21. A fluid introduction hole 211 through which the fluid to be measured is introduced from the attached portion is formed inside the main body portion 21. The male thread portion 22 is screwed into the attached portion.

[0015] [Measurement section 3] The measuring unit 3 is configured to measure the pressure, which is a physical quantity, of the fluid to be measured introduced through the fluid introducing member 2. In this embodiment, the measuring unit 3 has a Bourdon tube 31 and a pointer transmission mechanism 32. The Bourdon tube 31 is made of metal, and its tip is displaced in response to the pressure of the fluid to be measured introduced inside. The physical quantity measuring device 1 of this embodiment is configured to be able to measure the pressure of the fluid to be measured by transmitting the amount of displacement of the Bourdon tube 31 to the pointer 7 via the pointer transmission mechanism 32.

[0016] The pointer transmission mechanism 32 is configured to amplify the displacement of the tip of the Bourdon tube 31 and transmit it to the pointer 7. In this embodiment, the pointer transmission mechanism 32 is configured to have a so-called internal mechanism that has a sector, a rod, etc.

[0017] [Case component 4] The case member 4 is formed in a cylindrical shape with a bottom, and is configured to house the measuring unit 3, the sealing member 6, the pointer 7, the scale plate 8, etc. In this embodiment, the case member 4 is made of a metal such as stainless steel. An internal thread is formed on the outer circumferential surface of the case member 4, into which a cover member main body 51 of the cover member 5, which will be described later, is screwed.

[0018] [Cover part 5] The lid member 5 is disposed so as to cover the opening of the case member 4, and is configured to be detachable from the case member 4. In this embodiment, the lid member 5 has a lid member main body portion 51 and a window portion 52. The lid member main body 51 is made of metal and formed in a cylindrical shape. In this embodiment, a male thread is formed on the inner peripheral surface of the lid member main body 51, and is configured to be able to threadably engage with a female thread formed on the outer peripheral surface of the case member 4. That is, in this embodiment, the lid member 5 is detachably attached to the case member 4 by threading the lid member main body 51 into the case member 4.

[0019] The window portion 52 is attached to the opening of the lid member main body portion 51. In this embodiment, the window portion 52 has a transparent plate portion 521 and an attachment portion 522. Transparent plate portion 521 is formed in a disk shape from transparent resin and is arranged so as to cover the opening of case member 4. This allows the user to view pointer 7 and scale plate 8 housed in case member 4 through transparent plate portion 521.

[0020] The mounting portion 522 extends from the transparent plate portion 521 in a direction perpendicular to the transparent plate portion 521. That is, the window portion 52 is formed in a bottomed cylindrical shape with the transparent plate portion 521 as its bottom. The mounting portion 522 has a storage groove 523 formed on its outer peripheral surface facing the inner peripheral surface of the case member 4, in which the sealing member 6 is stored. In this embodiment, the storage groove 523 is formed so that its depth is the same as the thickness of a sealing member main body 61 of the sealing member 6, which will be described later. That is, in this embodiment, the storage groove 523 is formed so that the sealing member main body 61 of the sealing member 6 can be stored therein. Note that the configuration of the storage groove 523 is not limited to the above. For example, the depth may be greater than the thickness of the sealing member main body 61, or the depth may be smaller than the thickness of the sealing member main body 61, as long as the storage groove 523 is configured to be able to store at least a portion of the sealing member main body 61.

[0021] [Sealing member 6] 4 is a side view showing an outline of the sealing member 6, FIG. 5 is a perspective view showing an outline of the sealing member 6, and FIG. 6 is an enlarged side view showing an outline of the main part of the sealing member 6. As shown in FIG. 2 to 6, the sealing member 6 is made of rubber and is interposed between the case member 4 and the lid member 5 to seal the gap between the case member 4 and the lid member 5. In this embodiment, the sealing member 6 has a sealing member main body 61, a first protruding portion 62, and a second protruding portion 63.

[0022] The sealing member main body 61 is annular, and is housed in the housing groove 523 formed in the attachment portion 522 of the lid member 5 as described above. This makes it possible to prevent the sealing member main body 61 from being displaced, for example, when assembling the physical quantity measuring device 1. Therefore, it is possible to prevent the sealing performance between the case member 4 and the lid member 5 from being reduced due to the displacement of the sealing member main body 61.

[0023] In this embodiment, the outer circumferential surface of the sealing member main body 61 is formed with a bottom surface 611 that extends in a direction perpendicular to the direction in which the first protrusion 62 and the second protrusion 63 protrude.

[0024] The first protrusion 62 and the second protrusion 63 are formed to protrude toward the case member 4 from the outer peripheral surface of the sealing member main body 61 that faces the case member 4. In this embodiment, the first protrusion 62 and the second protrusion 63 are formed integrally with the sealing member main body 61 so as to have a generally triangular shape that narrows from the base end toward the tip end in a side view. In this embodiment, the first protrusion 62 and the second protrusion 63 are formed so as to have the same dimension V in the direction in which they protrude from the outer peripheral surface of the sealing member main body 61 toward the case member 4. This makes it possible to prevent the sealing performance of the first protrusion 62 or the second protrusion 63 from being reduced due to differences in dimension.

[0025] In this embodiment, when the first protrusion 62 and the second protrusion 63 are interposed between the case member 4 and the lid member 5, they are bent toward the bottom surface 611 of the sealing member main body 61 in a direction perpendicular to the protruding direction of the first protrusion 62 and the second protrusion 63 and are configured to abut against the case member 4. That is, the first protrusion 62 and the second protrusion 63 are formed so that the dimension V in the protruding direction is larger than the dimension S between the inner circumferential surface of the case member 4 and the outer circumferential surface of the mounting portion 522 of the lid member 5. This allows the first protrusion 62 and the second protrusion 63 to reliably abut against the case member 4 and the lid member 5 when they are interposed between the case member 4 and the lid member 5 while being housed in the housing groove 523 formed in the mounting portion 522 of the lid member 5. Therefore, the first protrusion 62 and the second protrusion 63 can reliably seal the gap between the case member 4 and the lid member 5.

[0026] In this case, in this embodiment, since the sealing member 6 has two protrusions 62, 63, the first protrusion 62 and the second protrusion 63, even if the sealing by one of the protrusions 62, 63 is incomplete, it can be covered by the sealing by the other protrusions 62, 63. Therefore, even if the manufacturing precision of the case member 4 is low, the sealing performance between the case member 4 and the cover member 5 can be improved.

[0027] Furthermore, in this embodiment, the first protrusion 62 and the second protrusion 63 protrude from the outer peripheral surface of the sealing member main body 61 that faces the case member 4 toward the inner peripheral surface of the case member 4; that is, the first protrusion 62 and the second protrusion 63 abut against the inner peripheral surface of the case member 4 to form a seal. As a result, even if the lid member main body 51 is loosened from the case member 4, the direction in which the lid member main body 51 is screwed into the case member 4 is different from the direction in which the first protrusion 62 and the second protrusion 63 protrude (the direction in which the lid member 5 presses the sealing member 6 against the case member 4), so there is no effect. Therefore, even if the lid member main body 51 of the lid member 5 is loosened from the case member 4, a decrease in sealing performance can be suppressed.

[0028] In this embodiment, in a side view, dimension H between the tip of the first protruding portion 62 and the tip of the second protruding portion 63 in a direction perpendicular to the direction in which the first protruding portion 62 and the second protruding portion 63 protrude is configured to be larger than dimension V of the first protruding portion 62 and the second protruding portion 63 in a direction in which the first protruding portion 62 and the second protruding portion 63 protrude from the outer circumferential surface of the sealing member main body 61 toward the case member 4. This ensures a dimension for the first protruding portion 62 to bend when the first protruding portion 62 is bent and interposed between the case member 4 and the cover member 5. This prevents the first protruding portion 62 and the second protruding portion 63 from interfering with each other, which would result in a decrease in sealing performance.

[0029] [Guideline 7] The pointer 7 is a member that indicates the pressure of the fluid to be measured detected by the Bourdon tube 31, and has a pointer body 71 and a shaft portion 72. The pointer body 71 rotates about the shaft 72 as the rotation axis, thereby indicating a scale 81 displayed on the dial plate 8 in accordance with the pressure of the fluid to be measured detected by the Bourdon tube 31. The shaft 72 passes through a shaft insertion hole 82 formed in the center of the dial plate 8 and is connected to the pointer transmission mechanism 32. This allows the displacement of the tip of the Bourdon tube 31 caused by the pressure of the fluid to be measured to be transmitted to the pointer body 71 via the pointer transmission mechanism 32.

[0030] [Scale plate 8] The scale plate 8 is disposed so as to face the transparent plate portion 521 of the cover member 5, and has a scale 81 displayed on its surface. As a result, the physical quantity measuring device 1 is configured to be able to display the pressure of the fluid to be measured by causing the pointer body 71 to point to the scale 81. Further, a shaft insertion hole 82 penetrating from the front surface to the back surface is formed in the scale plate 8. The shaft 72 described above is inserted into the shaft insertion hole 82.

[0031] The present embodiment as described above can achieve the following effects. (1) In this embodiment, the sealing member 6 interposed between the case member 4, which houses the measuring unit 3 that measures the pressure of the fluid to be measured, and the lid member 5 that covers the opening of the case member 4, has a first protrusion 62 and a second protrusion 63 that protrude toward the case member 4 from the outer peripheral surface of the annular sealing member main body 61 that faces the case member 4. As a result, the sealing member 6 seals the gap between the case member 4 and the lid member 5 with the multiple protrusions 62, 63. Therefore, even if the sealing by one of the protrusions 62, 63 is incomplete, this can be covered by the sealing by the other protrusions 62, 63. Therefore, even if the manufacturing precision of the case member 4 is low, the sealing performance between the case member 4 and the lid member 5 can be improved. Furthermore, in this embodiment, the first protrusion 62 and the second protrusion 63 protrude toward the case member 4 from the outer peripheral surface of the sealing member main body 61 that faces the case member 4. In other words, the first protrusion 62 and the second protrusion 63 abut against the inner peripheral surface of the case member 4 to form a seal, and are therefore not affected by the pressing force of the lid member 5. Therefore, even if the lid member 5 becomes loose relative to the case member 4, it is possible to prevent a decrease in sealing performance.

[0032] (2) In this embodiment, the mounting portion 522 of the cover member 5 is provided with the storage groove 523 for storing the sealing member main body 61, so that the sealing member main body 61 can be stored in the storage groove 523. Therefore, it is possible to prevent the sealing member 6 from being misaligned and the sealing performance from being deteriorated.

[0033] (3) In this embodiment, the first protrusion portion 62 and the second protrusion portion 63 have the same dimension V in the protruding direction, so that it is possible to prevent the sealing ability of the first protrusion portion 62 or the second protrusion portion 63 from being reduced due to differences in dimensions.

[0034] (4) In this embodiment, the outer peripheral surface of the sealing member main body 61 is formed with a bottom surface 611 that extends in a direction perpendicular to the direction in which the first protrusion 62 and the second protrusion 63 protrude. Therefore, when the sealing member 6 is interposed between the case member 4 and the lid member 5, the first protrusion 62 can bend in a direction perpendicular to the direction in which the first protrusion 62 protrudes, toward the bottom surface 611 of the sealing member main body 61. Therefore, the first protrusion 62 is interposed between the case member 4 and the lid member 5 in a bent state. In other words, no gap is created between the first protrusion 62 and the case member 4, thereby improving the sealing performance between the case member 4 and the lid member 5.

[0035] (5) In the present embodiment, the dimension H between the tip of the first protrusion 62 and the tip of the second protrusion 63 in the direction perpendicular to the direction in which the first protrusion 62 and the second protrusion 63 protrude on the bottom surface 611 is larger than the dimension V in the direction in which the first protrusion 62 and the second protrusion 63 protrude. Therefore, when the first protrusion 62 is bent and interposed between the case member 4 and the cover member 5, a dimension for bending the first protrusion 62 can be ensured. Therefore, it is possible to prevent the first protrusion 62 and the second protrusion 63 from interfering with each other and reducing the sealing performance.

[0036] [Variations] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention.

[0037] In the embodiment described above, the storage groove 523 for storing the sealing member main body 61 is formed in the attachment portion 522 of the cover member 5, but this is not limiting. For example, the storage groove for storing the sealing member main body 61 may be formed on the inner circumferential surface of the case member. That is, the first protrusion and the second protrusion may be configured to protrude toward the outer circumferential surface of the cover member and abut against the outer circumferential surface of the cover member.

[0038] In the above embodiment, the sealing member 6 is formed with two protrusions, the first protrusion 62 and the second protrusion 63, but this is not limiting. For example, the sealing member may be formed with three or more protrusions, as long as a plurality of protrusions are formed.

[0039] In the above embodiment, the fluid introducing member 2 is configured to include the male thread portion 22, but is not limited to this. For example, the fluid introducing member may be configured to include a female thread portion, or may be configured to be joined to the attached portion by welding, as long as it is configured to be attachable to the attached portion.

[0040] In the above embodiment, the case member 4 is made of metal, but this is not limiting. For example, the case member 4 may be made of resin. In the above embodiment, the case member 4 is formed in a cylindrical shape with a bottom, but is not limited to this. For example, the case member may be formed in a square cylindrical shape with a bottom, as long as it is configured to be able to accommodate a Bourdon tube, a pointer, a pointer transmission mechanism, a scale plate, etc. Furthermore, the inside of the case member may be filled with a fluid such as glycerin liquid.

[0041] In the above embodiment, the physical quantity measuring device 1 is configured to be able to detect the pressure of the fluid to be measured, but is not limited to this. For example, the physical quantity measuring device may be configured to be able to detect the temperature, differential pressure, etc. of the fluid to be measured, as long as it is configured to be able to measure the physical quantity of the fluid to be measured. [Explanation of symbols]

[0042] 1...physical quantity measuring device, 2...fluid introduction member, 3...measuring section, 4...case member, 5...lid member, 6...sealing member, 7...pointer, 8...scale plate, 21...main body, 22...male thread portion, 31...Bourdon tube, 32...pointer transmission mechanism, 51...lid member main body, 52...window portion, 61...sealing member main body, 62...first protrusion portion, 63...second protrusion portion, 71...pointer main body, 72...shaft portion, 81...scale, 82...shaft insertion hole, 211...fluid introduction hole, 521...transparent plate portion, 522...mounting portion, 523...storage groove, 611...bottom portion.

Claims

1. a fluid introducing member having a fluid introducing hole formed therein through which a fluid to be measured is introduced; a measuring unit that measures a physical quantity of the fluid to be measured introduced through the fluid introduction member; a case member formed in a bottomed cylindrical shape and accommodating the measuring unit; a cover member for covering an opening of the case member; a sealing member interposed between the case member and the lid member to seal the gap between the case member and the lid member, the sealing member has an annular sealing member main body and a plurality of protruding portions protruding from an outer peripheral surface of the sealing member main body facing the case member or the lid member toward the case member or the lid member, The protrusion has a first protrusion and a second protrusion, a bottom surface portion is formed on an outer peripheral surface of the sealing member main body between the first protrusion and the second protrusion in a direction perpendicular to a direction in which the first protrusion and the second protrusion are protruding, when viewed from a side; In a side view, a dimension between a tip end of the first protrusion and a tip end of the second protrusion in a direction perpendicular to a direction in which the first protrusion and the second protrusion are protruding is larger than a dimension of the first protrusion and the second protrusion in a direction in which the first protrusion and the second protrusion are protruding from an outer peripheral surface of the sealing member main body toward the case member or the lid member. A physical quantity measuring device characterized by:

2. 2. The physical quantity measuring device according to claim 1, The case member or the cover member has a storage groove for storing the sealing member main body. A physical quantity measuring device characterized by:

3. 3. The physical quantity measuring device according to claim 1, The first protrusion and the second protrusion have the same dimension in a direction protruding from the outer circumferential surface of the sealing member main body toward the case member or the lid member. A physical quantity measuring device characterized by:

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