JPH0743235A - Pressure gauge with simple recorder - Google Patents

Abstract

PURPOSE:To provide a pressure gauge with a simple recorder which does not require much labor and time in installing a pressure sensor and recorder and, at the same time, the size of which does not become larger. CONSTITUTION:A pressure leading-out tube connected with the pressure gauge of a compressor is usually connected to the pressure leading-in port 5 of a pressure gauge provided with a simple recorder through a connecting pipe 17. A pressure from the pressure leading-out pipe acts on a pressurizing section 13 from the port 5 and moves a piston 6 to the position corresponding to the pressure against the pressing force of a spring 7 and contracting bellows 9. Therefore, a pointer 12 also moves together with the piston 6 and indicates a pressure indicating value. When the pointer 12 indicates the value, a take-up roller 15 is driven by means of a take-up motor 16 and winds rolledrecording paper 14. A recording pen 12a at the front end of the pointer 12 records pressure changes in a continuous line on the recording paper 14 wound around the roller 15 driven by the motor 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure gauge with a simple recorder used in a pressure detecting device such as a refrigerating device.

[0002]

2. Description of the Related Art Generally, in a refrigeration system, suction pressure and discharge pressure of a compressor are measured by a pressure gauge using a Bourdon tube. Then, the operator measures every predetermined time and records the suction pressure, the discharge pressure and the like of the compressor in the record book.

In addition, investigation and repair of the operating state of the refrigeration system,
At the time of adjustment, as shown in FIG. 4, a piezoelectric conversion type pressure sensor 22 is connected to the pressure extraction pipe 21 to which the pressure gauge 21a of the compressor 20 is connected, and the pressure sensor 22 is further connected to the recorder 23. It is connected to the A / D converter 24. Therefore, the pressure signal (analog signal) detected by the pressure sensor 22 is A /
The digital signal is converted into a digital signal by the D converter 24, the digital signal is counted by the recording unit 25, and is printed in dots on the recording paper by the recording unit 25 at every predetermined time (for example, every one minute). As a result, the printed points are drawn linearly with the passage of time, and as a result, a linear graph is drawn.
The pressure gauge 21a is not limited to the Bourdon tube type, but other types are used.

[0004]

However, the pressure sensor 22 should be connected to the pressure take-out pipe 21 and the recorder 23 should be connected to the pressure sensor 22 when investigating, repairing, or adjusting the operating state of the refrigeration system. However, there is a problem that the labor is troublesome. Further, the recorder 23 is considerably larger than the pressure gauge 21a, and it is difficult to secure a space for placing the recorder 23 in the non-vibration area.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to omit the labor for installing a pressure sensor and a recorder and to provide a simple recorder with which the size of the apparatus does not increase. It is intended to provide a pressure gauge.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a pressure gauge with a simplified recorder according to the present invention includes a detection unit for detecting pressure and a pointer for indicating the detected pressure. Inside the case main body, there are pressure detecting means having the above, a recording pen arranged on the pointer, and recording paper winding means for winding a roll-shaped recording paper in a direction substantially perpendicular to the moving direction of the recording pen. It is characterized in that the pressure change is recorded on the recording paper by being stored in a recording pen.

[0007]

According to the above-mentioned structure, the pressure gauge with a simplified recorder according to the present invention detects the pressure by the detecting portion of the pressure detecting means and displays the pressure detected by the pointer. Then, the pressure is recorded on the roll-shaped recording paper wound by the recording paper winding means by the recording pen arranged on the pointer.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a pressure gauge with a simplified recorder according to the present invention, (a) is a top view, (b) is a front view, and FIG. 2 is a part showing its main part. FIG.

The pressure gauge with a simplified recorder has a case body 1 which is approximately the same size as a conventional pressure gauge.
In the case body 1, a detection unit 2 that detects pressure and a recording unit 3 that records the pressure are arranged. The detection unit 2 has a cylindrical detection unit main body 4, the lower end of which is open to form a pressure intake port 5.
Further, a piston 6 is inserted in the detection unit main body 4, a spring 7 for urging the piston 6 downward is connected to the upper end of the piston 6, and a spring 7 is provided above the spring 7.
An adjusting screw 8 is provided for adjusting the urging force of the pointer, that is, for adjusting the zero point of the pointer 12.

A bellows 9 is arranged on the piston 6, and a stopper 10 for restricting the upward movement of the bellows 9 is arranged inside the detecting portion main body 4. Further, the pointer 12 is provided on the piston 6 via the rod 11.
Is provided, and the tip of the pointer 12 is composed of a recording pen 12a such as a stylus pen that does not require ink or the like. A pressure instruction value (0 to 25K) 13a indicated by the pointer 12 is drawn on the surface of the case body 1.
Note that reference numeral 13 is a pressurizing unit composed of the detecting unit main body 4 and the piston 6. The bellows 9 has a bellows shape having a plurality of pleats, and is made of phosphor bronze, brass, beryllium copper, copper-nickel alloy, or the like.

Further, the recording unit 3 includes a roll-shaped recording paper 14
A take-up roller 15 for taking up the recording paper, a take-up motor 16 that is connected to the shaft of the take-up roller 15 via a speed change mechanism 17, and drives the take-up roller 15 to rotate, and drives the motor 16. Power source such as a battery (not shown). The recording paper 14
Uses stylus paper that does not require ink or the like that can draw a graph when contacted.

Next, the operation of this embodiment will be described.

As shown in FIG. 3, normally, a pressure take-out pipe 21 to which a pressure gauge 21a of a compressor 20 is connected and a pressure intake port 5 of a pressure gauge with a simplified recorder are connected to a connecting pipe 1.
Connect by 7. It is also possible to directly connect the pressure intake port 5 to the pressure extraction pipe 21 without using the connection pipe 18.

The pressure from the pressure take-out pipe 21 acts on the pressurizing portion 13 from the pressure intake port 5, resists the urging force of the spring 7 and expands and contracts the bellows 9 to move it to a position corresponding to the pressure. To do. As a result, the pointer 12 also moves integrally with the piston 6, and the pointer 12 indicates the pressure instruction value 13a.

At this time, the winding roller 16 is driven to rotate by the winding motor 16 to wind the roll-shaped recording paper 14. Then, the recording pen 12a at the tip of the pointer 12
Records the pressure change on the roll-shaped recording paper 14 wound by the winding roller 15 driven by the winding motor 16 by continuous lines. As described above, according to the pressure gauge with a simplified recorder of the present embodiment, the operator only has to collect the recording paper 14 on which the pressure change is recorded regularly, and therefore the visual measurement value is regularly recorded on the recording book. You can omit the trouble of putting on.

In the above embodiment, the recording paper 14
Although the stylus paper is used for the recording pen 12a and the stylus pen is used for the recording pen 12a, the invention is not limited to this.
A pen drawn with ink may be used for a.

Further, in the above-mentioned embodiment, the example in which the bellows 9 is used for the detecting section 2 has been described, but the present invention is not limited to this, and it goes without saying that a detecting section using a diaphragm, a chamber or the like may be used.

Further, in the above embodiment, the roll-shaped recording paper 14 is wound by the take-up roller 15 driven by the take-up motor 16, but the present invention is not limited to this and the motor is driven. The leading end side of the recording paper 14 may be carried out of the case body 1 by a roller.

[0020]

As described above, according to the pressure gauge with a simple recorder according to the present invention, the pressure is detected by the detecting portion of the pressure detecting means, the pressure detected by the pointer is displayed, and the pressure is displayed on the pointer. Since the pressure is recorded on the roll-shaped recording paper wound by the recording paper winding means by the recording pen provided, it is possible to omit the labor for installing the pressure sensor and the recorder. In addition, the pressure gauge with a simple recorder has a detection unit and a recording unit housed in a case body that is about the same size as a conventional pressure gauge, so the device does not become large and can be installed anywhere. It is possible to

[Brief description of drawings]

FIG. 1 is a diagram showing a pressure gauge with a simplified recorder according to the present invention, in which (a) is a top view and (b) is a front view.

FIG. 2 is a broken cross-sectional view showing a main part of a pressure gauge with a simplified recorder according to the present invention.

FIG. 3 is a diagram for explaining the operation of the present invention.

FIG. 4 is a diagram showing a conventional pressure recording method.

[Explanation of symbols]

 1 Case Main Body 2 Detecting Section 3 Recording Section 5 Pressure Inlet 9 Bellows 12 Pointer 12a Recording Pen 13 Pressurizing Section 13a Pressure Indication 14 Recording Paper 15 Winding Roller 16 Winding Motor

Claims (1)

[Claims] 1. A pressure detecting means having a detecting portion for detecting pressure and a pointer for indicating the detected pressure, a recording pen arranged on the pointer, and a coplanar surface with respect to a moving direction of the recording pen. A pressure gauge with a simplified recorder, characterized in that a recording paper winding means for winding a roll of recording paper in a substantially right angle direction and a recording paper winding means are housed in a case body, and a pressure change is recorded on the recording paper by the recording pen. .