JP3010630U - Mechanical pressure gauge - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to measure the maximum boost pressure and normal pressure of a turbocharger with a mechanical pressure gauge. [Structure] The pressure measuring means is composed of a pressure gauge using a Bourdon tube that is deformed by the pressure of a fluid introduced. The switching means switches between introducing the fluid as it is into the pressure measuring means or introducing it via a one-way valve. When the fluid is introduced into the pressure measuring means as it is, the measured value of the pressure measuring means shows the normal pressure of the fluid which changes from moment to moment. On the other hand, when the fluid is introduced into the pressure measuring means via the one-way valve, the measured value of the pressure measuring means will indicate the maximum pressure of the fluid. Therefore, by switching the fluid introduction path by the switching means, the pressure measuring means can be operated as a normal pressure gauge or a maximum pressure gauge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanical pressure gauge for measuring fluid pressure, and more particularly to a mechanical pressure gauge suitable for measuring supercharging pressure of a supercharger of an internal combustion engine.

[0002]

[Prior art]

 Generally, as a technique for improving the output of an internal combustion engine, there is a supercharger (turbocharger) that forcibly increases the amount of air burned in the internal combustion engine (intake air amount). This supercharger has an exhaust bypass pipe that bypasses part of the exhaust gas to the exhaust turbine side of the supercharger, and this exhaust bypass pipe in order to control the boost pressure so that it does not rise excessively. The exhaust bypass valve that controls the amount of exhaust gas that passes through the exhaust bypass valve and the intake bypass pressure on the downstream side of the intake compressor of the supercharger (that is, the supercharging pressure of the supercharger) that is introduced into the pressure chamber through the pressure guiding pipe. A supercharging pressure control device including an actuator for driving is provided.

The actuator adjusts the opening degree of the exhaust bypass valve according to the magnitude of the supercharging pressure introduced into the pressure chamber via the pressure guiding pipe. That is, when the supercharging pressure introduced into the pressure chamber becomes larger than the target value, the actuator increases the opening degree of the exhaust bypass valve to reduce the amount of exhaust gas acting on the exhaust turbine. On the contrary, when the boost pressure is smaller than the target value, the actuator reduces the opening of the exhaust bypass valve to increase the amount of exhaust acting on the exhaust turbine. As described above, the adjustment of the opening degree of the exhaust bypass valve depends on the magnitude of the supercharging pressure introduced into the pressure chamber of the actuator. Therefore, conventionally, the magnitude of the supercharging pressure introduced into the pressure chamber of the actuator is adjusted. Therefore, a pressure reducing valve is branched and connected in the middle of the pressure guiding pipe, and the opening of this pressure reducing valve is adjusted to reduce the supercharging pressure introduced into the pressure chamber of the actuator by a predetermined amount. The supercharging pressure was controlled so that it would not exceed a target value.

On the other hand, when the target supercharging pressure of the supercharger is raised for the purpose of improving the output and characteristics of the engine, the opening of the pressure reducing valve is increased to further increase the pressure introduced into the pressure chamber of the actuator. Reduce pressure to increase supercharging pressure. In such a case, the supercharging pressure of the turbocharger can be adjusted to the target supercharging pressure by actually measuring the maximum supercharging pressure using a pressure gauge and adjusting the opening of the pressure reducing valve according to the measured value. I was trying to get pressure. Usually, in order to measure the maximum supercharging pressure of the supercharger, it was necessary to drive the vehicle with the accelerator fully opened and measure the maximum value of the supercharging pressure while the vehicle was running. However, it was dangerous and very difficult for the driver to check the pressure value while driving. Therefore, in such a case, a pressure gauge that can confirm the maximum value of the supercharging pressure after traveling was necessary.

Conventionally, as a pressure gauge for measuring the supercharging pressure of such a supercharger, an electric pressure gauge composed of a semiconductor pressure sensor or the like is commercially available. According to this electric pressure gauge, by storing the maximum output signal from the semiconductor pressure sensor in the memory circuit, it is possible to easily confirm the maximum boost pressure of the supercharger after traveling. it can. In addition, a normal automobile is equipped with an electric pressure gauge that can display the boost pressure value. It is necessary to store the maximum boost pressure value as described above. It is not possible to do so, but it is only possible to measure the normal pressure at each time during operation. Therefore, in order to measure the maximum boost pressure, it was necessary to install a mechanical pressure gauge or an electric pressure gauge that can measure the maximum pressure separately.

[0006]

[Problems to be solved by the device]

 However, since the conventional electric pressure gauge is composed of a semiconductor pressure sensor and an electronic circuit for processing the output of the semiconductor pressure sensor, there is a problem that it is more expensive than an ordinary mechanical pressure gauge. There was also a problem that the electric pressure gauge had to be complicatedly wired regardless of whether it was installed in the engine room or inside the meter.

The present invention has been made in view of the above points, and is capable of measuring the maximum pressure and normal pressure of the supercharging pressure of a supercharger, is inexpensive, and does not require complicated wiring. An object of the present invention is to provide a mechanical pressure gauge that can be easily attached.

[0008]

[Means for Solving the Problems]

 The mechanical pressure gauge according to the present invention switches between pressure measuring means for mechanically measuring the pressure of a fluid and whether the fluid is directly introduced into the pressure measuring means or introduced through a one-way valve. It is provided with a switching means.

[0009]

[Action]

 In this invention, the pressure measuring means is composed of a pressure gauge using a Bourdon tube which is deformed by the pressure of the introduced fluid. When the fluid is introduced into the pressure measuring means as it is, the measured value of the pressure measuring means shows the normal pressure of the fluid which changes from moment to moment. On the other hand, when the fluid is introduced into the pressure measuring means via the one-way valve, the measured value of the pressure measuring means indicates the maximum pressure of the fluid. Therefore, the pressure measuring means should operate as a normal pressure gauge or a maximum pressure gauge by appropriately switching with the switching means whether the fluid is directly introduced into the pressure measuring means or is introduced through the one-way valve. become.

As described in claim 2, the switching means is connected to the first pipe for introducing the fluid into the pressure measuring means through the one-way valve, and the portion including the one-way valve of the first pipe. On the other hand, it is preferable that the second pipe is provided in parallel with the second pipe for introducing the fluid into the pressure measuring means through the opening / closing cock, and the fluid introduction path is switched depending on the open / close state of the opening / closing cock. Since the fluid is not introduced through the second pipe when the opening / closing cock is closed, the pressure measuring means uses the first pipe, that is, the one-way valve after the opening / closing cock is closed. It operates as a pressure gauge for measuring the maximum value, which measures only the fluid pressure introduced. On the other hand, when the opening / closing cock is open, the fluid is introduced through the second pipe, so the pressure means can measure the pressure of the fluid pressure which changes moment by moment. Operates as a pressure gauge for measurement.

Further, as described in claim 4, the switching means is constituted by one-way and two-way switching valves provided in the middle of the pipe for introducing the fluid into the pressure measuring means, and the position of the switching valve It is advisable to switch the introduction route of the fluid according to the above. Since the one-way and two-way switching valve is installed in the pipe part that introduces the fluid pressure to the pressure measuring means, if you want to operate the pressure measuring means as a pressure gauge for measuring the maximum value, switch between one-way and two-way. The valve may be switched to the one-way valve side, or may be switched to the two-way valve side when operating as a pressure gauge for normal pressure measurement. Therefore, when the one-way and two-way switching valve is switched to the one-way valve side, it operates as a pressure gauge for measuring the maximum value that measures only the fluid pressure introduced through the one-way valve. On the other hand, when switching to the two-way valve side, the fluid pressure is introduced via the two-way valve, so the pressure means can measure the pressure that changes momentarily of the fluid pressure for normal pressure measurement. Operates as a pressure gauge. As described above, the pressure measuring means can be operated for maximum value measurement and normal pressure measurement only by providing the one-way and two-way switching valve in the piping portion. Furthermore, by using the mechanical pressure gauge according to the present invention for measuring the supercharging pressure of the supercharger of the internal combustion engine as described in claim 3 or 5, Maximum pressure and normal pressure can be easily measured without requiring complicated wiring.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing a configuration example of a mechanical pressure gauge according to the first invention. The pressure gauge 1 is an elastic pressure gauge using a Bourdon tube. Switching means 2 is connected to the pressure gauge 1 via a pipe 3. A supercharging pressure from a supercharger is introduced into the switching means 2 via a pipe 4.

The switching means 2 appropriately switches the measuring method, whether the pressure gauge 1 measures the maximum pressure of the supercharging pressure or the normal pressure. The switching means 2 comprises a one-way valve 21, a branch pipe 22 and an opening / closing cock 23. The one-way valve 21 is connected between the pipe 3 and the pipe 4. The branch pipe 22 is provided in parallel with the one-way portion 21, and connects the pipe 3 and the pipe 4 via the opening / closing cock 23. The opening / closing cock 23 is provided inside the branch pipe 22 and controls the connection state between the pipe 3 and the pipe 4.

That is, when the opening / closing cock 23 is opened as shown in FIG. 1 (A), the pipe 3 and the pipe 4 are bidirectionally connected in terms of pressure, and the change in the supercharging pressure of the pipe 4 remains unchanged. It will be transmitted to the pipe 3 side. Therefore, when the opening / closing cock 23 is opened as shown in FIG. 1 (A), the pressure gauge 1 operates as a normal pressure gauge that measures the pressure of the supercharging pressure moment by moment.

On the other hand, when the opening / closing cock 23 is closed as shown in FIG. 1 (B), the branch pipe 22 is in a pressure disconnection state, so that the pipe 3 and the pipe 4 are pressurized only via the one-way valve 21. Will be connected to each other. However, the one-way valve 21 makes the pressure in the pipe 3 equal to the pressure in the pipe 4 only when the pressure in the pipe 4 is higher than the pressure in the pipe 3, but the pressure in the pipe 4 is higher than that in the pipe 3. If it is smaller, the pipe 3 and the pipe 4 are pressure disconnected. Therefore, when the opening / closing cock 23 is closed as shown in FIG. 1 (B), the pressure gauge 1 becomes a maximum pressure gauge for measuring the maximum pressure of the boost pressure. As described above, in the mechanical pressure gauge according to the embodiment of FIG. 1, by controlling the opening / closing state of the opening / closing cock 23 by the switching means 2, the maximum value of the supercharging pressure is displayed on the pressure gauge 1 or The pressure can be displayed.

FIG. 2 is a diagram showing another configuration example of the mechanical pressure gauge according to the present invention. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The embodiment of FIG. 2 differs from that of FIG. 1 in that a one-way and two-way switching valve 5 is provided between the pipe 3 and the pipe 4.

The one-way and two-way switching valve 5 has the same function as that of the switching means 2 shown in FIG. That is, whether the pressure gauge 1 measures the maximum pressure of the supercharging pressure or the normal pressure is selected and the measuring method is appropriately switched. The one-way and two-way switching valve 5 is composed of a spool 51, a one-way valve 52 and a two-way valve 53 connected to the spool 51, and connects the pipe 3 and the pipe 4 according to the moving position of the spool 51. The one-way valve 52 or the two-way valve 53 makes a pressure connection.

That is, when the spool 51 is in the position as shown in FIG. 2A, the pipe 3 and the pipe 4 are pressure-directionally connected by the two-way valve 53, and the boost pressure of the pipe 4 is reduced. The change is directly transmitted to the pipe 3 side. Therefore, when the spool 51 is in the position as shown in FIG. 2A, the pressure gauge 1 operates as a normal pressure gauge for measuring the supercharging pressure at every moment.

On the other hand, when the spool 51 is in the position as shown in FIG. 2B, the pipe 3 and the pipe 4 are pressure-connected via the one-way valve 53. The one-way valve 53 is connected so that the pressure in the pipe 3 becomes equal to the pressure in the pipe 4 only when the pressure in the pipe 4 is larger than the pressure in the pipe 3, like the one-way valve 21 in FIG. If the pressure in the pipe 4 is lower than the pressure in the pipe 3, the pipe 3 and the pipe 4 are pressure-disconnected. Therefore, when the spool 51 is in the position as shown in FIG. 2B, the pressure gauge 1 operates as a maximum pressure gauge for measuring the maximum pressure of the supercharging pressure. As described above, in the mechanical pressure gauge according to the embodiment shown in FIG. 2, the maximum value of the boost pressure is displayed on the pressure gauge 1 by appropriately controlling the position of the spool 51 of the one-way and two-way switching valve 5. , Normal pressure can be displayed.

In the above-described embodiment, the case where the switching means 2 is provided between the pipe 3 and the pipe 4 of the pressure gauge for normal pressure measurement has been described, but the pressure for pressure measurement for maximum value pressure having a one-way valve is described. For the force meter, the branch pipe 22 and the opening / closing cock 23 may be provided in parallel with the one-way valve. Further, in the above-described embodiment, the case where the direction of the one-way valve 21 is from the pipe 4 to the pipe 3 has been described. May be. In this case, if the one-way and two-way switching valve shown in FIG. 2 is composed of a two-way valve and two one-way valves each having a different direction, it is possible to switch the direction of the one-way valve. It becomes possible to measure pressure and negative pressure.

[0021]

[Effect of device]

 As described above, according to the present invention, it is possible to easily measure the maximum pressure and the normal pressure by using a normal mechanical pressure gauge by simply changing the piping of the mechanical pressure gauge. There is. Further, the mechanical pressure gauge of the present invention does not require complicated wiring, so that it can be easily attached.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a mechanical pressure gauge according to the present invention.

FIG. 2 is a diagram showing another configuration example of the mechanical pressure gauge according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure gauge 2 Switching means 21 One-way valve 22 Branch pipe 23 Opening / closing cock 3 Piping 4 Piping 5 One-way and two-way switching valve 51 Spool 52 Two-way valve 53 One-way valve

Claims (5)

[Scope of utility model registration request] 1. A pressure measuring means for mechanically measuring the pressure of a fluid, and a switching means for switching between introducing the fluid as it is into the pressure measuring means or introducing it through a one-way valve. A mechanical pressure gauge that is characterized. 2. The switching means includes a first pipe for introducing the fluid into the pressure measuring means through a one-way valve, and a first pipe in parallel with a portion including the one-way valve. A second pipe that is provided and that introduces the fluid into the pressure measuring means via an opening / closing cock, and switches the introduction path of the fluid according to the open / closed state of the opening / closing cock. The mechanical pressure gauge described. 3. The mechanical pressure gauge according to claim 2, wherein a supercharging pressure of a supercharger of an internal combustion engine is measured as the pressure of the fluid. 4. The switching means comprises one-way and two-way switching valves provided in the middle of a pipe for introducing the fluid into the pressure measuring means, and the introduction of the fluid depending on the position of the switching valve. The mechanical pressure gauge according to claim 1, wherein the path is switched. 5. The mechanical pressure gauge according to claim 4, wherein a supercharging pressure of a supercharger of an internal combustion engine is measured as the pressure of the fluid.