JP4191519B2 - Bourdon tube vibration-proof measuring instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a Bourdon tube type vibration-proof measuring device, and more particularly, to a structure of a measuring device such as a pressure gauge configured to convert a displacement of a Bourdon tube into a rotational movement of a pointer via a transmission mechanism.
[0002]
[Prior art]
Generally, in a Bourdon tube type pressure gauge, the tip of a Bourdon tube connected to a base is connected to a transmission mechanism, and a pointer is connected to a rotary drive shaft provided in the transmission mechanism. The displacement of the Bourdon tube according to the change in the internal pressure rotates the rotary drive shaft through the transmission mechanism, so that the pointer connected to the rotary drive shaft indicates a predetermined measurement value.
[0003]
In the Bourdon tube type pressure gauge as described above, conventionally, an oil-filled pressure gauge in which oil (or glycerin) is sealed in the case body is commercially available in order to prevent the movement of the pointer. However, this oil-sealed pressure gauge increases the manufacturing cost because it is necessary to enhance the sealing performance of the case body, and all the operation of the internal mechanism is braked by the oil sealing, so that vibration can be sufficiently prevented. When oil (glycerin) having a viscosity of 1 is used, there is a problem that the indicated value of the pointer becomes inaccurate.
[0004]
Therefore, the applicant of the present application firstly connects the brake body, in which the fluid is accommodated inside the case body in which the impeller is disposed, to the rotation drive shaft, thereby reliably preventing the needle from swinging. A pipe-type anti-vibration measuring device was devised (see Patent Document 1 below).
[0005]
[Patent Document 1]
Japanese Patent No. 2648835
[Problems to be solved by the invention]
However, the above-mentioned conventional Bourdon tube type vibration-proof measuring instrument is attached to a transmission mechanism called a so-called suspension type internal unit. In the case of a conventional type of installation type internal unit, it is an extension of the base. Since the transmission mechanism is supported by the support portion, the extension support portion becomes an obstacle, and there is a problem that an attachment structure similar to that of the suspension type internal unit cannot be configured. In addition, if the braking body is housed inside the transmission mechanism, it can be applied to a stationary internal machine, but the conventional transmission mechanism cannot be used as it is, and the thickness of the transmission mechanism also increases. There is a problem that the entire design of the vessel must be redone.
[0007]
Therefore, the present invention solves the above-mentioned problems, and the problem is that in a Bourdon tube type measuring instrument having an installation type internal unit structure in which a transmission mechanism is supported by an extension support portion of a base, It is an object of the present invention to provide a configuration that can easily apply a braking means for preventing the above-described problem.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a Bourdon tube vibration-proof measuring instrument of the present invention is configured to transmit a displacement of a Bourdon tube to a display means through a transmission mechanism, and has a pressure detection pipe line connected to the Bourdon tube. In a Bourdon tube type vibration-proof measuring instrument having an installation type internal structure in which the transmission mechanism is supported on the front side of an extension support part integrally provided on a base constituted by a caster provided, a braking case A braking body configured to impart rotational resistance to the transmission mechanism by the viscous resistance of the fluid between the rotating resistance shaft and the rotational resistance shaft, and the braking case is disposed on the side, A lid that closes the opening of the case body opposite to the extension support portion, the extension support portion being provided on a distal end side to support the transmission mechanism, and the support region Than the base end side Part region and is provided, said braking body is arranged on the rear side of the extension support unit, the fixed onto the mounting surface portion is a rear surface of the support region, said base region back than the support area Configured to be higher toward the side, and configured such that the height of the base fixing surface portion which is the surface on the back side of the base region is equal to or higher than the height of the braking body fixed on the mounting surface portion, A base fixing surface portion is attached to the measuring instrument case, the case body includes a through shaft support portion that penetrates the extension support portion, and the rotation resistance shaft is inserted into the through shaft support portion and configured by the through shaft support portion. The bearing structure is rotatably supported by the bearing structure , penetrates the extension support portion, and is connected to the transmission mechanism.
[0009]
According to this invention, the brake body is disposed on the back side of the extension support portion of the base, the brake case is fixed to the extension support portion, and the rotation resistance shaft passes through the extension support portion and is connected to the transmission mechanism. Thus, the brake body can be securely attached without any change to the basic support structure of the installation type internal unit. Therefore, since the braking body can be attached to the existing installation type internal machine at low cost, the measuring instrument can be supplied to the market at a low cost. In addition, since the braking body is fixed to the extension support portion of the base, the fixing accuracy of the braking body can be increased.
[0010]
Further, in the present invention, a base having a height equal to or higher than a height of the braking body on a surface on a back side of the extension supporting part with respect to a mounting surface part to which the braking body is attached in the extension supporting part. Accordingly to the arc fixing surface is provided, because even attach the brake body to the mounting surface of the extension support unit, the height of the braking body is less the height of the base fixing surface, the outer size of the instrument It can be configured without changing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a Bourdon tube type vibration-proof measuring device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view (a) and a right side view (b) showing the internal structure of a measuring instrument (pressure gauge) 100 according to the present invention, and FIG. 2 is a rear view showing the internal structure of the measuring instrument 100.
[0012]
The measuring instrument 100 includes a base 101 having a pressure detection pipe line therein, and a Bourdon pipe 102 communicating with the pressure detection pipe line and having a base end portion 102 a connected and fixed to the base 101. Base 101 is constructed usually cast product thus as a connection unit that connects the like to the joint. The base 101 is provided with an extended support portion 103 that is integrally formed. A back support plate 104 is connected and fixed to the extended support portion 103. The back side support plate 104 is connected and fixed to the front side support plate 106 via a connecting member 105.
[0013]
A transmission mechanism 110 is configured between the back support plate 104 and the front support plate 106. The transmission mechanism 110 is provided with a connection link 111 that is connected to the distal end portion 102 b of the Bourdon tube 102. The connecting link 111 is rotatably connected to a drive link 112 that is rotatably supported with respect to the support shaft 105a. More specifically, the connecting link 111 is slidably engaged with a long hole provided at the end of the drive link 112. A rotation drive shaft 113 is rotatably supported on the transmission mechanism 110 (the central portion thereof). The drive link 112 meshes with a pulley 114 attached to the rotary drive shaft 113. Further, the rotational drive shaft 113 receives a restoring force by the spring spring 115 or the like. More specifically, the center end of the mainspring spring 115 is connected and fixed to the rotation drive shaft 113, and the outer peripheral end of the mainspring spring 115 is connected and fixed to the connecting member 105. The rotation drive shaft 113 is connected to a pointer 117 which is a display means through a display plate 116.
[0014]
A braking body 120 is attached to the back side of the extension support portion 103. The brake body 120 is connected to the rotation drive shaft 113 through the extension support portion 103. The extended support portion 103 includes a support region 103A provided on the distal end side and supporting the transmission mechanism, and a base region 103B provided on the base side of the support region 103A. The transmission mechanism 110 is supported via the back side support plate 104 with respect to the support region 103A. The brake body 120 is fixed on the mounting surface portion 103a of the support region 103A. The base region 103B is configured to be higher (thick in the illustrated example) toward the back side than the support region 103A. The height h2 of the base fixing surface portion 103b of the base region 103B is configured to be equal to or higher than the height h1 of the braking body 120 fixed on the mounting surface portion 103a of the support region 103A.
[0015]
FIG. 3 shows an enlarged internal structure of the braking body 120. The brake body 120 is provided with a case body 121 and a lid body 122 fitted to the case body 121. The case body 121 and the lid body 122 constitute a braking case. The case body 121 is provided with a through shaft support portion 121a that penetrates the extended support portion 103 (the support region 103A thereof) and a main body portion 121b that has a braking space therein. The through shaft support portion 121 a is fixed inside a through hole provided in the extension support portion 103. For example, the through shaft support portion 121a of the case body 121 is press-fitted into the through hole of the extension support portion 103, or is inserted into the through hole and then fixed by appropriate means such as caulking or welding. For example, when caulking is performed, the illustrated tool A or B is applied to the end portion 121 c of the through shaft support portion 121 a and the through shaft support portion 121 a is fixed to the extension support portion 103. Here, it is desirable to use the tool A when the extension support portion 103 is relatively thick, and the tool B when the thickness is relatively thin.
[0016]
A rotation resistance shaft 123 is inserted into the through shaft support portion 121a, and is rotatably supported by a bearing structure (sliding bearing in the illustrated example) constituted by the through shaft support portion 121a. The rotation resistance shaft 123 may be integrated with the rotation drive shaft 113. A resistance member 124 is fixed to the tip of the rotation resistance shaft 123. More specifically, the member to be resisted 124 is press-fitted and fixed to the rotation resistance shaft 123. It is preferable that the outer peripheral portion 124b of the member to be resisted 124 has a shape that generates an appropriate resistance such as a gear shape. The member to be resisted 124 is accommodated in the braking space. A fluid 125 having viscous resistance such as silicone oil is accommodated in the braking space. The amount of the fluid 125 is preferably about 1/3 to 2/3 of the entire volume of the braking space defined by the braking case. For example, in the illustrated example, the fluid 125 has a volume about half that of the braking space. This is to prevent the fluid 125 from leaking even when the internal pressure of the braking space increases due to a temperature change or the like.
[0017]
In the present embodiment described above, for example, when the pressure in the pressure detection pipe configured inside the base 101 rises, the Bourdon tube 102 is deformed to rotate the connection link 111 and the drive link 112, and the pulley 114. When the rotary drive shaft 113 is rotationally driven via the, the pointer 117 is rotated. At this time, the rotational resistance shaft 123 of the braking body 120 fixed to the extension support portion 103 also rotates. However, when the resistance member 124 receives the viscous resistance of the fluid 125, the rotational resistance shaft 123, that is, the rotational drive shaft. Since 113 also receives a predetermined braking effect, the vibration of the pointer 117 is restricted.
[0018]
In the present embodiment, the brake body 120 is fixed to the back side of the extension support part 103 (that is, the side opposite to the transmission mechanism 110) with respect to the extension support part 103 of the base 101. A good braking effect can be obtained without any change. That is, the back side of the extension support portion 103 is a place that has not been used in the past, so that the braking means can be provided only by providing a penetrating structure in the extension support portion 103 without changing the overall configuration of the measuring instrument. Can be easily installed.
[0019]
Further, the extension support portion 103 is provided with a mounting surface portion 103a to which the braking body 120 is attached and a base fixing surface portion 103b configured to be higher toward the back side than the mounting surface portion 103a. Since the height is equal to or higher than the height of the braking body 120 on the mounting surface portion 103a, even when the internal unit is attached to the measuring instrument case 150 indicated by a two-dot chain line in FIG. There is no obstacle. That is, the above configuration has an advantage that the braking body 120 can be attached without changing the external dimensions of the measuring instrument (the shape dimension of the measuring instrument case 150).
[0020]
The Bourdon tube type vibration-proof measuring instrument of the present invention is not limited to the above-described illustrated examples, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, an example of configuring a normal pressure gauge has been described. However, the present invention is not limited to a simple pressure gauge, and a measurement configured to detect a pressure value or a pressure change using a Bourdon tube. Any device such as a flow meter, an anemometer, or a water depth meter may be used.
[Brief description of the drawings]
FIG. 1 is a schematic front view (a) and a schematic right side view (b) showing an internal structure of an embodiment of a Bourdon tube type vibration-proof measuring instrument according to the present invention.
FIG. 2 is a schematic rear view showing the internal unit structure of the embodiment.
FIG. 3 is a schematic cross-sectional view showing the internal structure of the braking body according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Measuring device, 101 ... Base, 103 ... Extension support part, 103A ... Support area, 103a ... Mounting surface part, 103B ... Base area, 103b ... Base fixing surface part, 110 ... Transmission mechanism, 120 ... Braking body, 121 ... Case body, 122 ... Cover body, 123 ... Rotation resistance shaft, 124 ... Resistant member, 125 ... Fluid body

Claims (2)

An extension support unit integrally provided on a base configured by a casting having a pressure detection pipe line connected to the Bourdon tube and configured to transmit the displacement of the Bourdon tube to a display means via a transmission mechanism In a Bourdon tube type vibration-proof measuring instrument having an installation type internal structure in which the transmission mechanism is supported on the front side thereof,
A braking body configured to give rotational resistance to the transmission mechanism by the viscous resistance of the fluid between the braking case and the rotational resistance shaft is provided,
The brake case has a case body arranged on the extension support part side, and a lid body for closing an opening on the opposite side of the extension support part of the case body,
The extension support portion is provided with a support region that is provided on the distal end side and supports the transmission mechanism, and a base region that is provided on the proximal end side with respect to the support region,
The braking body is disposed on the back side of the extended support part, and is fixed on a mounting surface part that is a back side surface of the support region,
The base region is configured to be higher toward the back side than the support region, and the height of the braking body in which the height of the base fixing surface portion, which is the back side surface of the base region, is fixed on the mounting surface portion. Configured to be more than
The base fixing surface part is attached to the measuring instrument case,
The case body includes a through shaft support portion that penetrates the extension support portion, and the rotation resistance shaft is rotatably supported by a bearing structure that is inserted into the through shaft support portion and configured by the through shaft support portion , A Bourdon tube type vibration-proof measuring instrument which is connected to the transmission mechanism through the extended support portion. 2. The Bourdon tube type vibration-proof measuring instrument according to claim 1, wherein the through-shaft support portion is fixed inside a through-hole provided in the extension support portion .

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