JP3014331U - Pressure gauge - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a pressure gauge for measuring a momentary maximum pressure in addition to a steady pressure in engine performance tests of an internal combustion engine or the like. [Constitution] In the present invention, a pressure detection Breton tube 2 for measuring a measurement pressure, a display needle 4 for displaying a measurement value of the pressure detection Breton tube 2, an inlet 5 for introducing the detection pressure, and a pressure detection Between the Breton tube 2 and the inlet 5, a check valve 6 for supplying the inspection pressure only to the pressure detecting Breton tube 2,
It is characterized in that the check valve 6 has a built-in bypass valve 7 capable of short-circuiting both ends.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure gauge capable of accurately measuring not only steady pressure of an internal combustion engine but also instantaneous maximum pressure.

[0002]

[Prior art]

 Conventionally, it was not significant to measure the instantaneous maximum peak pressure in a pressure gauge, and there was no pressure gauge that measures such an instantaneous maximum peak pressure. However, some barometers used in meteorological observation, which is one field of pressure measurement, can measure the highest or lowest barometers. In particular, as a pressure gauge that does not use a liquid column, it is generally called an aneroid pressure gauge.This pressure gauge indicates the amount of atmospheric pressure displacement due to the pressure receiving part such as a Breton tube or bellows in terms of the rotation angle of the display needle. The barometer is configured to display, and in the barometer, a highest pressure hand indicating the highest pressure and the lowest pressure, or a lowest pressure hand is provided coaxially with the display needle.

The maximum or minimum atmospheric pressure display mechanism for each needle of the maximum atmospheric pressure needle or the minimum atmospheric pressure needle is such that the maximum atmospheric pressure needle is in the maximum atmospheric pressure direction and the minimum atmospheric pressure needle is in the minimum atmospheric pressure direction. When the indicator needle is provided and the display needle moves to the highest pressure side, the latching protrusion of the highest pressure needle contacts the indicator needle and only the highest pressure needle moves with the indicator needle. On the contrary, when the display needle is swung in the direction of the lowest pressure, the latching protrusion of the lowest pressure needle comes into contact with the display needle and moves only the lowest pressure needle. A spring is provided on each of the highest pressure needle and the lowest pressure needle to hold the moving position of the needle.

[0004]

[Problems to be solved by the device]

 However, in performance tests of internal combustion engines such as engines, there was a request to measure the maximum pressure, but the maximum pressure of these devices was instantaneous. Therefore, the structure of the conventional barometer is not suitable for a pressure gauge for instantaneous maximum pressure measurement. That is, in the measurement of the internal pressure of the engine of the internal combustion engine, the pressure changes rapidly, and the display needle also changes rapidly. Therefore, if the maximum pressure indicator needle mechanism used in conventional barometers is used as is, the maximum pressure indicator needle will follow the instantaneous pressure change of the display needle, but the maximum pressure indicator needle will follow. If the spring for holding the needle is strengthened, it will not be possible to follow the instantaneous pressure fluctuation and accurate pressure display will not be possible. If the pressure is extremely large and instantaneous, the maximum pressure indicator needle will be broken. Conversely, if the spring for holding the maximum pressure indicator needle is weakened, when the maximum pressure indicator needle momentarily moves, it will move more than necessary due to inertial force and correct display cannot be performed. In addition, when the pressure gauge is vibrated, the maximum pressure display will move due to the vibration, and accurate display cannot be performed.

In addition, a digital pressure gauge can detect the maximum pressure by detecting it with a pressure sensor, but when the operator needs to make a momentary judgment in numerical display, an analog display is more preferable. Work efficiency may be good. Therefore, the present invention is to provide a pressure gauge that is an analog pressure gauge and that can accurately measure the maximum pressure even if there is an instantaneous pressure change.

[0006]

[Means for Solving the Problems]

 In the present invention, the pressure receiving measurement unit that measures the measured pressure, the display member that displays the pressure measurement amount of the pressure receiving measurement unit, the inlet that introduces the detected pressure, and the pressure receiving unit between the pressure receiving measurement unit and the inlet. A pressure gauge comprising a check valve for supplying an inspection pressure only to the measuring section and a bypass valve capable of short-circuiting both ends of the check valve.

[0007]

[Action]

 In the present invention, a check valve is provided in the pressure measuring unit between the pressure measuring unit and the inlet connected to the pressure source, and the inspection pressure supplied from the inlet is supplied to the Breton tube via the check valve. To be done. Only when the inspection pressure is higher than the pressure in the pressure measuring unit, the check valve opens and the pressure is supplied to the pressure measuring unit to change the maximum pressure. When the pressure is less than the maximum pressure, the check valve is closed, so the pressure inside the pressure receiving measurement unit always maintains the maximum pressure. Therefore, even if vibration or the like is applied to the pressure gauge, the display is not changed and the display can be maintained. Further, when the pressure is released from the pressure receiving measurement unit, the bypass valve is opened, and the compressed gas contained in the pressure receiving measurement unit is returned to the introduction port via the bypass valve and can be in a steady state. When displaying the normal pressure, if the bypass valve is opened, the check valve does not operate and the pressure gauge operates normally.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are views showing a pressure gauge according to the present invention, FIG. 1 is an overall sectional view, FIG. 2 is an explanatory view showing a check valve, FIG. 3 is an explanatory view showing a bypass valve, and FIG. 4 is a bypass valve. FIG. 7 is an explanatory view showing the relationship between the positioning body and the guide groove. In the present invention, for example, a pressure receiving and measuring unit including a pressure detecting Breton tube 2 is provided in a housing 1. The amount of pressure displacement of the pressure detecting Breton tube 2 is displayed on a display member by a display needle 4 rotatably mounted on a dial 3 provided on the upper surface of the housing 1, for example.

An introduction port 5 for connecting to a pressure source to be inspected is provided on the bottom surface of the housing 1. Between the pressure detection Breton pipe 2 and the introduction port 5, the pressure detection Breton pipe 2 is provided. A check valve 6 is provided to supply the test pressure only to the. The check valve 6 is provided with a bypass valve 7 capable of short-circuiting both ends of the valve portion.

FIG. 2 is an enlarged sectional view showing an example of the check valve. The check valve 6 includes a check valve main body 60, a connecting body 62 sealed inside the main body by an O-ring 61, a valve body 63 at the tip of the connecting body 62, and a valve body 63 connected to the connecting body 62. It consists of a pressing spring 64.

The connection body 62 is provided with a passage 65 communicating with the introduction port 5, a bypass valve inlet side branch passage 81 leading to the bypass valve 7 is provided in the middle of the passage 65, and the tip of the passage 65 is It can be brought into close contact with the lower surface of the valve body 63.

The valve body 63 is inserted movably up and down inside the check valve body 60. The shape of the valve body 63 is such that the upper surface is opened, and a hole 66 is formed in the vicinity of the bottom up to the outer peripheral surface with a slightly reduced diameter. Has been drilled. A spring 64 provided between the bottom of the valve body 63 and the inner surface of the upper portion of the check valve body 60 urges the valve body 63 against the upper end surface of the connecting body 62.

Further, inside the check valve body 60, a bypass valve outlet side branch passage 82 leading to the bypass valve 7 and a passage 67 connecting to the pressure detecting Breton pipe 2 are provided at a portion where the valve body 63 is not closed by movement. It is provided.

The bypass valve 7 is a normal valve body, and in the embodiment, as shown in FIG. 3, a bypass passage main body 70 is provided with a passage 71 having a smaller diameter in two stages. A valve element 72 having an O-ring 76 at its tip is provided in the passage so that it can be inserted into this small diameter portion and the smaller passage 71 can be closed.

A support rod 73 is integrally provided at the rear end of the valve body 72, a positioning body 74 is provided in the middle of the support rod 73, and a guide provided in the circumferential direction of the passage 71. It is movably inserted in the groove 75.

As shown in FIG. 4, the guide groove 75 has a shape in which the depth of the groove is different so that the position of the groove becomes up and down every 90 degrees, for example, and the positioning rod 74 is shown in FIG. When it is inserted into the shallow guide groove 75 by rotating as shown by the arrow, the position of the support rod 73 is lowered, and the O-ring 76 at the tip of the valve body 72 is located in the small diameter portion of the passage 71. Is inserted, and the bypass valve 7 is closed. On the contrary, when the support rod 73 is inserted into the deep inner groove 75, the position of the support rod 73 is raised, and the O-ring 76 at the tip of the valve body 72 is located in the large diameter portion of the passage 71 to close the passage 71. The bypass valve 7 is released.

Further, an opening of a bypass valve inlet side branch passage 81 communicating with the check valve 6 is provided at the bottom of the passage 71, and a spring 78 for pushing up the valve body 72 is provided. It is provided. On the other hand, the bypass valve outlet side branch passage 82 is opened at a position where the passage 71 is not closed by the valve body 72 when the valve body 72 moves upward in the portion where the diameter of the passage 71 increases. A knob 77 is provided at the rear end of the support rod 73 so that the rotation operability of the support rod 73 is good. Reference numeral 79 in the figure is an O-ring provided to maintain the airtightness of the inside 71 of the passage.

The present embodiment is configured as described above, and the inlet port 5 is connected to an inspection pressure source such as an internal combustion engine with the knob 77 rotated and the bypass valve 7 closed. Then, when the pressure of the pressure source increases, the measured pressure pushes up the valve body 63 via the inlet port 7 and the passage 65 of the connection body 62 of the check valve 6, and as shown by the dotted line in FIG. The body 63 is pushed up to form a gap between the connecting body 62 and the valve body 63, and the gas to be measured is supplied to the pressure detecting Breton tube 2 through the hole 66 and the passage 67 through the gap.

When the pressure to be inspected decreases, the valve body 63 is connected to the upper end surface of the connecting body 62 by a spring 64 provided between the bottom of the valve body 63 and the upper inner surface of the check valve body 60. Then, the valve element 63 is closed and the pressure inside the pressure detecting Breton tube 2 is maintained at the maximum pressure. When the pressure to be inspected is higher than the pressure in the pressure detecting Breton tube 2, the check valve 6 is released and the pressure is supplied to the pressure detecting Breton tube 2 in the same manner as above.

Next, when the pressure inside the pressure detection Breton tube 2 is released, the knob 77 is rotated, and the positioning body 74 provided on the support rod 73 moves in the guide groove 75. However, the guide groove 75 is formed in two kinds of depth in the circumferential direction. When the guide groove 75 is rotated 90 degrees, the guide groove 75 is located in the deep guide groove, and the positioning body 75 moves upward. Along with this, the support rod 73 is pulled upward, and the closing of the valve body 72 and the passage 71 provided at the tip of the support rod is released. Therefore, the gas to be detected in the pressure detecting Breton tube 2 passes through the passage 67, the bypass valve outlet side branch passage 82, the passage 71, the bypass valve inlet side branch passage 81, and the inside of the connecting body 62 of the check valve 6. It is discharged to the outside from the inlet 5 via the passage 65.

Needless to say, when it is not necessary to display the maximum pressure, the bypass valve 7 can be opened to use as a normal pressure gauge. The check valve and bypass valve described above are merely examples of the present invention, and other check valves and bypass valves may be used.

[0022]

[Effect of device]

 The present invention is configured as described above and has a check valve for supplying the test pressure only to the pressure measuring unit for measuring the measured pressure. Even if there is an increase, the increased amount of gas passes through the check valve and is supplied to the pressure receiving measurement unit, so that maximum pressure can be detected. Also, the gas to be measured once supplied to the pressure receiving measurement unit does not return to the pressure supply source due to the check valve, the maximum pressure can be maintained and the worker can work with peace of mind. You can Furthermore, by providing a bypass valve in parallel with the check valve, if the residual gas to be detected in the pressure receiving measurement unit is released at any time, the maximum pressure can be measured again by recirculation, and the bypass valve is open. Then, it can be used as a normal pressure gauge. In addition, the pressure display has an analog structure, which is different from the pressure gauge that digitally displays the numerical value, and the worker can instantly and easily recognize the maximum value, resulting in high work efficiency and a simple and inexpensive structure. It has an excellent effect that it can be manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view of a pressure gauge according to the present invention.

FIG. 2 is an enlarged sectional view showing a check valve used in the present invention.

FIG. 3 is an enlarged sectional view showing a bypass valve used in the present invention.

FIG. 4 is an explanatory view showing a relationship between a positioning body of a bypass valve used in the present invention and a guide groove.

[Explanation of symbols]

 1 Enclosure 2 Breton tube for pressure detection 3 Dial 4 Indicator needle 5 Inlet port 6 Check valve 60 Check valve body 61 O-ring 62 Connection body 63 Valve body 64 Spring 65 Passage 66 Hole 67 Passage 7 Bypass valve 71 Passage 72 Valve Body 73 Support rod 74 Positioning body 75 Guide groove 76 O-ring 77 Knob 78 Spring 79 O-ring 81 Bypass valve inlet side branch passage 82 Bypass valve outlet side branch passage

Claims (1)

[Scope of utility model registration request] 1. A pressure receiving / measuring unit for measuring a measured pressure, a display member for displaying a pressure measurement amount of the pressure receiving / measuring unit, an introducing port for introducing a detected pressure, and a pressure receiving unit between the pressure receiving / measuring unit and the introducing port. A pressure gauge comprising a check valve for supplying an inspection pressure only to a measuring section and a bypass valve capable of short-circuiting both ends of the check valve.