JP3662083B2 - Pressure gauge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure gauge for measuring a pressure of a medium to be measured (pressure fluid) connected to an object to be measured.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a pressure gauge is known that includes a housing portion having a built-in pressure measurement portion and a joint portion connected to an object to be measured, and an introduction path for introducing a measured medium from the joint portion to the pressure measurement portion.
[0003]
6 and 7 show a pressure gauge 50 of this type. In the figure, reference numeral 51 denotes an integrally formed housing part. The housing part 51 includes a cylindrical peripheral surface part 51s and a back surface part 51c that closes one end of the peripheral surface part 51s, and has an opening 52 at the center of the back surface part 51c. Reference numeral 53 denotes a pressure measuring unit built in the housing unit 51. The pressure measuring unit 53 includes a Bourdon tube 54 curved in a C shape, a joint block 55 in which one end of the Bourdon tube 54 is coupled, and a housing unit. A shaft 57 that is rotatably supported at the center position of 51 and has a pointer 56 at the tip, and a motion conversion mechanism 58 that converts the displacement of the other end of the Bourdon tube 54 into rotation of the shaft 57 are provided. On the other hand, the joint block 55 is integrally provided with a joint portion 59, and an introduction path 60 for introducing a measured medium (pressure fluid) is provided inside the joint portion 59 and the joint block 55. Thereby, the inside of the Bourdon tube 54 communicates with the outside from the tip of the joint portion 59 via the introduction path 60. And the joint block 55 is fixed to the back surface part 51c of the housing part 51 by screwing. Reference numeral 61 denotes a spiral spring, 62 denotes a dial, and 63 denotes a transparent front cover.
[0004]
Therefore, if the joint portion 59 is attached to the object to be measured, the medium to be measured is introduced into the Bourdon tube 54 through the introduction path 60. As a result, the Bourdon tube 54 is deformed so that the curvature increases in accordance with the pressure of the medium to be measured, and the other end of the Bourdon tube 54 is displaced in one direction. This displacement is converted into the rotation of the shaft 57, that is, the deflection of the pointer 56 via the motion conversion mechanism 58.
[0005]
[Problems to be solved by the invention]
However, since the above-described conventional pressure gauge 50 introduces the medium to be measured from the joint portion 59 to the pressure measuring portion 53 through the introduction path 60, the following problems have occurred.
[0006]
First, there are many types of joints 59 corresponding to different objects to be measured. However, since the joint 59 and the pressure measurement unit 53 are integrated, a pressure gauge that adjusts the pressure gauge 50. It is necessary to prepare various types of connection ports for connecting the joint portion 59 on the adjuster side, leading to an increase in cost on the pressure gauge adjuster side and a decrease in workability during adjustment.
[0007]
Second, when the pressure gauge 50 is attached to the object to be measured, the housing part 51 may be held and rotated by hand. In this case, the pressure measuring part 53 including the joint part 59 and the scale plate 62 is used. Thus, in the structure in which the housing part 51 is assembled, geometric distortion occurs at the time of attachment to the object to be measured, and an error occurs in the indication performance.
[0008]
The present invention solves such problems existing in the prior art, and can reduce the cost and improve the workability at the time of adjustment, and eliminates the error in the indication performance that occurs during the attachment to the object to be measured. An object of the present invention is to provide a pressure gauge that can improve reliability.
[0009]
[Means for Solving the Problems and Embodiments]
The present invention includes a housing part 3 having a built-in pressure measuring part 2 and a joint part 4 connected to an object to be measured, and a pressure having an introduction path 5 for introducing a measured medium from the joint part 4 to the pressure measuring part 2. When the total 1 is configured, the housing portion 3 integrally including the cylindrical peripheral surface portion 11 and the back surface portion 12 that closes one end of the peripheral surface portion 11, and the back surface portion 12 are formed integrally with the back surface portion 12. A pressure measuring unit 2 that protrudes perpendicularly from the center of the outer surface and has a threaded portion 4n on the outer periphery, a curved Bourdon tube 22 and is configured as an integrated measuring unit 2u, and the measuring unit 2u And a unit-side introduction path 5u for introducing the fluid to be measured into one end of the Bourdon tube 22 and the inside of the joint portion 4 and the housing portion 3 and the guide portion provided in the radial direction of the back surface portion 12. The housing side introduction path 5h including the path portion 5hb, the concave portion 13 provided in one of the measurement unit 2u or the housing portion 3, the convex portion 14 provided in the other and inserted into the concave portion 13, and the tip of the convex portion 14 A connecting portion 6 for connecting the measuring unit 2u and the housing portion 3 and for connecting the unit side introduction path 5u and the housing side introduction path 5h by having a large diameter portion 14e for preventing the sealing member 15 from being detached. It is characterized by providing.
[0010]
In this case, according to a preferred embodiment, the measuring unit 2u has a base plate portion 16, the pressure measuring portion 2 is mounted on one surface of the base plate portion 16, and the convex portion 14 or the concave portion 13 is provided on the other surface. Can be arranged. The base plate portion 16 can be fixed to the housing portion 3.
[0011]
Thereby, since the pressure gauge 1 is basically constituted by a combination of the measurement unit 2u and the housing part 3 in which the joint part 4 is integrally formed, if the measurement unit 2u is assembled to the housing part 3, the housing The introduction part 5 provided on the part 3 side and the introduction part 5 provided on the measurement unit 2 u side are connected via the connection part 6, and the medium to be measured passes through the introduction part 5 connected by the connection part 6 to measure pressure. Part 2 is introduced. Therefore, since the measurement unit 2u can be used in common even if the type of the joint part 4 in the housing part 3 is different, the connection port provided in the pressure gauge adjuster for adjusting the pressure measurement part 2 is connected to the measurement unit 2u. One kind of connection port corresponding to the part 6 is sufficient. Further, when the pressure gauge 1 is attached to the object to be measured, the housing part 3 and the joint part 4 are integrally formed even if the housing part 3 is held and rotated, so that no geometric distortion occurs.
[0012]
【Example】
Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.
[0013]
First, the configuration of the pressure gauge 1 according to the present embodiment will be described with reference to FIGS.
[0014]
The pressure gauge 1 includes a measurement unit 2 u configured by integrating the pressure measurement unit 2. The measurement unit 2u has a base plate portion 16, the pressure measurement portion 2 is mounted on one surface of the base plate portion 16, and the convex portion 14 is projected on the other surface. That is, the joint block 21 is attached to one surface of the base plate portion 16, a part of the joint block 21 is projected to the other surface through the opening of the base plate portion 16, and this projecting portion is used as the convex portion 14. The convex portion 14 has a cylindrical shape, and a sealing member 15 using an O-ring is attached to the outer peripheral surface. As shown in FIG. 4, the large-diameter portion 14e may be provided at the tip of the convex portion 14 by, for example, opening the tip outward, thereby preventing the sealing member 15 from being detached.
[0015]
Further, one end of a Bourdon tube 22 curved in a C shape is embedded in the joint block 21 and coupled. On the other hand, a unit side introduction path 5u for introducing a medium to be measured (pressure fluid) is formed inside the joint block 21, and thereby the inside of the Bourdon tube 22 is projected through the unit side introduction path 5u. Communicate to the outside from the tip. In this case, the unit-side introduction path 5u is a first introduction path part 5ua provided on the central axis of the convex part 14, and a second introduction path part 5ub that connects the first introduction path part 5ua and one end opening of the Bourdon tube 22. Consists of. Further, a shaft 24 having a pointer 23 at the tip is rotatably disposed at a substantially central position of the measurement unit 2u, and the other end of the Bourdon tube 22 is between the other end of the Bourdon tube 22 and the shaft 24. A motion conversion mechanism 25 for converting the above displacement into the rotation of the shaft 24 is provided. As shown in FIG. 3, the motion converting mechanism 25 is attached to the shaft 24, a sector gear 26 whose middle portion is rotatably supported, a link 27 connecting the rear end of the sector gear 26 and the other end of the Bourdon tube 22, and the shaft 24. Accordingly, a pinion 28 meshing with the front end gear portion 26g of the sector gear 26 and a spiral spring 29 attached to the shaft 24 are provided. In addition, 30 is a scale board.
[0016]
On the other hand, the pressure gauge 1 includes a housing portion 3, and a joint portion 4 is formed integrally with the housing portion 3. The housing part 3 is integrally formed with a cylindrical peripheral surface part 11 and a back surface part 12 that closes one end of the peripheral surface part 11, and a joint part 4 is formed to project at a right angle at the outer surface center of the back surface part 12. The joint portion 4 has a screw portion 4n on the outer periphery. In addition, the housing part 3 which has the joint part 4 integrally can also be formed by cutting like an Example, and may be formed by other methods, such as casting. Furthermore, the case where the joint portion 4 and the housing portion 3 are formed as separate bodies and are integrally coupled by caulking, bonding, welding, or the like is not excluded. Further, a housing side introduction path 5 h is formed inside the joint portion 4 and the housing portion 3. In this case, the housing-side introduction path 5h includes a first introduction path part 5ha provided on the central axis of the joint part 4, a second introduction path part 5hb provided inside the back surface part 12 in the radial direction, and the second introduction path. It consists of the 3rd introduction way part 5hc provided between the middle part of part 5hb, and the inner surface of back part 12, and the peripheral edge part opening of back part 12 generated when forming 2nd introduction way part 5hb is welded after processing, etc. It is closed by the closing member 5hs. Further, a part of the third introduction path portion 5hc opening in the inner surface of the back surface portion 12 is formed as a concave portion 13 having a circular cross section.
[0017]
Thereby, the convex part 14 equipped with the sealing member 15 can be accommodated in the concave part 13. When the convex part 14 is accommodated, it is formed inside the third introduction path part 5 hc inside the concave part 13 and the convex part 14. The first introduction path portion 5ua is connected, and a compressed sealing member 15 is interposed between the inner peripheral surface of the concave portion 13 and the outer peripheral surface of the convex portion 14 to ensure airtightness. In this case, the concave portion 13, the convex portion 14, and the sealing member 15 constitute the connection portion 6, and the unit side introduction path 5 u and the housing side introduction path 5 h constitute the introduction path 5.
[0018]
In addition, in FIG. 5, the example of a change at the time of changing the formation position of the joint part 4 in the housing part 3 is shown. In the modified example, the first introduction path portion 5ha and the second introduction path portion 5hb are formed on the same axis with respect to the embodiment shown in FIG. . In addition, the position and shape of the recess 13 and other configurations are the same as those of the recess 13 of the embodiment shown in FIG. Therefore, in FIG. 5, the same parts as those in FIG. On the other hand, 31 is a transparent front cover, which is attached to the front end of the housing part 3.
[0019]
Next, a method for assembling the pressure gauge 1 according to the present embodiment will be described in detail with reference to FIGS.
[0020]
First, the measurement unit 2u is manufactured. As shown in FIG. 1, the measurement unit 2 u includes a base plate portion 16, a joint block 21, a convex portion 14, a sealing member 15, a Bourdon tube 22, a pointer 23, a shaft 24, a motion conversion mechanism 25, and a scale plate 30. . Moreover, since the measurement unit 2u includes the pressure measurement unit 2 having a pressure measurement function, the pressure measurement unit 2 is adjusted (calibrated) at the stage where the measurement unit 2u is manufactured. That is, the convex portion 14 with the sealing member 15 attached is connected to the connection port of the pressure gauge adjuster to adjust the pressure measuring unit 2. Since such a measurement unit 2u can be used in common even when the types of the housing parts 3 as shown in FIG. 5 are different, the connection port of the pressure gauge adjuster connecting the measurement unit 2u is connected to the measurement unit 2u. One type of connection port corresponding to the 2u convex portion 14 is sufficient, and the cost on the pressure gauge adjuster side can be reduced.
[0021]
On the other hand, the measurement unit 2 u is accommodated in the housing part 3 and attached to the housing part 3. At this time, as shown in FIG. 2, the convex portion 14 fitted with the sealing member 15 is accommodated in the concave portion 13. As a result, the third introduction path 5hc inside the recess 13 and the first introduction path 5ua formed inside the projection 14 are connected, and between the inner peripheral surface of the recess 13 and the outer periphery of the projection 14. The sealing member 15 in a compressed state is interposed to ensure airtightness. 1, since the base plate portion 16 overlaps the inner surface of the back surface portion 12, the base plate portion 16 and the back surface portion 12 are joined by rivets 33 (see FIG. 3). Other fastening members such as screws may be used instead of rivets. And as shown in FIG. 2, if the front cover 31 is attached to the front end of the housing part 3, the assembly of the pressure gauge 1 will be complete | finished.
[0022]
Next, the function of the pressure gauge 1 according to the present embodiment and the usage method will be described with reference to the drawings.
[0023]
First, in use, the joint portion 4 of the pressure gauge 1 is attached to the object to be measured. In this case, the joint portion 4 is screwed into the screw hole on the measurement object side. When mounting, the housing part 3 may be turned by hand, but in this case, since the housing part 3 and the joint part 4 are integrally formed, geometric distortion does not occur. Based on the indication performance error does not occur.
[0024]
Thereby, the measured medium of the measurement target object is the first introduction path portion 5ha, the second introduction path portion 5hb, the third introduction path portion 5hc (concave portion 13), the first introduction path portion 5ua (convex portion 14), It is introduced into the inside of the Bourdon tube 22 through the second introduction path portion 5ub. As a result, the Bourdon tube 22 is deformed so as to have a larger curvature corresponding to the pressure of the medium to be measured, and the other end of the Bourdon tube 22 is displaced in one direction. This displacement is converted into a rotational displacement of the sector gear 26 via the motion conversion mechanism 25, that is, the link 27, and the front end gear portion 26 g of the sector gear 26 rotates the pinion 28. As a result, the shaft 24 rotates and the pointer 23 swings at an angle corresponding to the magnitude of the pressure.
[0025]
The embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, and the like are arbitrarily set within the scope of the present invention. Can change.
[0026]
For example, although the housing part showed the case where a peripheral surface part and a back surface part were integrally formed, the case where it forms separately is not excluded. In configuring the connecting portion, the concave portion may be provided in the measurement unit and the convex portion may be provided in the housing portion, and the connecting portion is not necessarily limited to the configuration of the concave portion and the convex portion.
[0027]
【The invention's effect】
As described above, the pressure gauge according to the present invention includes a housing portion integrally including a cylindrical peripheral surface portion and a back surface portion that closes one end of the peripheral surface portion, and an outer surface of the back surface portion formed integrally with the back surface portion. A joint part that protrudes at a right angle from the center and has a threaded part on the outer periphery, a pressure measuring part that has a curved Bourdon tube and is configured as an integrated measuring unit, and one end of the Bourdon tube that is provided in this measuring unit A unit-side introduction path for introducing a fluid to be measured into the housing, a housing-side introduction path that is formed inside the joint portion and the housing portion, and includes an introduction passage portion provided inside the radial direction of the back surface portion, and a measurement unit or a housing portion A concave portion provided on one side and a convex portion provided on the other side and inserted into the concave portion, and a large-diameter portion for preventing separation of the sealing member at the tip of the convex portion. To provide a connecting portion for connecting the door and the housing portion, and connecting the unit-side introduction path and the housing-side introduction path, a marked effect as follows.
[0028]
(1) The pressure gauge adjuster can be adjusted at the stage of the measurement unit, and even if the type of joint is different, the measurement unit can be used in common. In addition to the basic effect that the mouth is only one type of connection port corresponding to the measurement unit, cost reduction and workability improvement at the time of adjustment can be achieved, the housing part and the joint part are integrally formed, When attaching the pressure gauge to the object to be measured, even if the housing part is turned by hand, geometric distortion does not occur, and it is possible to eliminate errors in indication performance based on this and to improve reliability. Can be increased.
[0029]
(2) A housing-side introduction path is formed inside the joint part and the housing part, and a part of the introduction path part (second introduction path part) included in the housing-side introduction path is radially inside of the back surface part of the housing part. Therefore, the Bourdon tube can be deformed so as to have a large curvature corresponding to the pressure of the medium to be measured.
[0030]
(3) According to a preferred embodiment, the connecting portion is constituted by a concave portion provided in one of the measurement unit or the housing portion, a convex portion provided in the other and inserted into the concave portion, and a sealing member interposed between the concave portion and the convex portion. In this case, the assembly can be facilitated.
[0031]
(4) According to a preferred embodiment, if a large-diameter portion is provided at the tip of the convex portion, the separation of the sealing member can be prevented.
[0032]
(5) According to a preferred embodiment, the measurement unit is provided with a base plate portion, the pressure measurement portion is mounted on one surface of the base plate portion, and a convex portion or a concave portion is disposed on the other surface. If it is fixed to the housing portion, further assembly can be facilitated.
[Brief description of the drawings]
FIG. 1 is a partially sectional side view showing a state in which a main part of a pressure gauge according to the present embodiment is disassembled,
FIG. 2 is a partial cross-sectional side view of the pressure gauge,
FIG. 3 is a partial cross-sectional front view of the pressure gauge,
FIG. 4 is a cross-sectional view showing a modification example of a convex portion in a connection portion of the pressure gauge,
FIG. 5 is a partial cross-sectional side view showing a modified example of a housing portion having a joint portion of the pressure gauge;
FIG. 6 is a partial cross-sectional side view of a pressure gauge according to a conventional technique;
FIG. 7 is a partial sectional front view of the pressure gauge,
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressure gauge 2 Pressure measuring part 2u Measuring unit 3 Housing part 4 Joint part 4n Screw part 5 Introducing path 5u Unit side introducing path 5hb Introducing path part 5h Housing side introducing path 6 Connection part 11 Peripheral surface part 12 Back surface part 13 Concave part 14 Convex part 15 Sealing member 16 Base plate part 22 Bourdon tube

Claims (3)

  In a pressure gauge having a housing portion having a built-in pressure measurement portion and a joint portion connected to an object to be measured, and having an introduction path for introducing a measurement medium from the joint portion to the pressure measurement portion, a cylindrical peripheral surface portion And a housing part integrally having a back surface part closing one end of the peripheral surface part, a joint part projecting at a right angle from the center of the outer surface of the back surface part by being formed integrally with the back surface part, and having a screw part on the outer periphery; A pressure measuring unit having a curved Bourdon tube and configured as an integrated measurement unit, a unit side introduction path provided in the measurement unit and introducing a fluid to be measured into one end of the Bourdon tube, and the joint And a housing-side introduction path including an introduction path portion provided in the radial direction inside the back surface portion, and the measurement unit or the housing. The measuring portion includes a concave portion provided on one side of the groove portion and a convex portion provided on the other side and inserted into the concave portion, and a large-diameter portion for preventing separation of the sealing member at the tip of the convex portion. A pressure gauge comprising: a unit and the housing part; and a connecting part for connecting the unit side introduction path and the housing side introduction path.   2. The pressure according to claim 1, wherein the measurement unit has a base plate portion, the pressure measurement portion is mounted on one surface of the base plate portion, and the convex portion or the concave portion is arranged on the other surface. Total.   The pressure gauge according to claim 2, wherein the base plate portion is fixed to the housing portion.

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