JPH05280652A - Method and device for regulating control pressure of pressure control valve - Google Patents

Abstract

PURPOSE:To adjust a control pressure by using air without using fuel. CONSTITUTION:A method is for adjusting a control pressure of a pressure control valve 10 divided into a control valve chamber 16 and an atmospheric chamber 20 by a diaphragm 12 and formed with a fuel introducing path 14 and a fuel discharge path 15 in the control valve chamber 16 to mount a valve unit 13 to the fuel discharge path 15 and a spring 25 into the atmospheric chamber 20. Here is introduced air into the control valve chamber 16, while detecting a pressure therein, to contract the spring 25 by crushing the atmospheric chamber 20 by a servo motor. Here is detected the pressure in the control valve chamber 16 by a pressure gage, to stop driving the servomotor when this detected pressure reaches a preset value. Since a relation of elastic force of the spring 25 to an air pressure value of the control valve chamber 16 is adjusted to a preset relation, by providing the air pressure value left as correlated to a control pressure value of the pressure control valve 10, the control pressure can be adjusted by using air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control pressure adjusting method and device for a pressure control valve, and more particularly to adjusting a pressure to be controlled by the pressure control valve by adjusting an elastic force of a spring in the pressure control valve. The present invention relates to a technology effectively used for manufacturing a fuel pressure control valve for controlling a fuel supply amount according to a fuel pressure.

[0002]

2. Description of the Related Art Generally, in a vehicle such as an automobile, a fuel pressure control valve for controlling a fuel supply amount according to a fuel pressure is provided in a fuel supply passage for supplying fuel in a fuel tank to an engine. It is set up.

Such a fuel pressure control valve has a housing, a diaphragm dividing the inside of the housing into a control valve chamber and an atmosphere chamber, a fuel introduction passage and a fuel discharge passage which communicate with the control valve chamber of the housing, respectively. A valve body mounted on the inlet side of the fuel discharge passage and a return spring provided in the atmosphere chamber for urging the diaphragm toward the control valve chamber are provided, and the valve body opens and closes the fuel discharge passage. Thus, the fuel supply amount is controlled according to the fuel pressure.

In the manufacturing process of such a fuel pressure control valve, after the fuel pressure control valve is assembled, the elastic force of the return spring is adjusted so that the fuel pressure control valve operates at a preset control pressure. The work to do is being carried out.

Conventionally, as a method for performing the control pressure adjusting work of the fuel pressure control valve, the fuel is actually circulated through the assembled fuel pressure control valve to artificially create a situation close to the actual use state. The method of carrying out is adopted.

However, the conventional control pressure adjusting method for the pressure control valve has the following disadvantages.

[0007] Since fuel is used, facilities with chemical resistance specifications are required, which increases the cost of the facilities. In addition, since fuel is used, buildings must also comply with the Fire Service Act.

When a part of the fuel remains in the fuel pressure control valve, dust or the like adheres to the residual liquid, and the dust or the like causes malfunction of the fuel pressure control valve.

[0009] In such a fuel pressure control valve, a pipe is connected to the outlet side of the fuel discharge passage, but when the pipe is connected, an ultraviolet curable resin may be applied to the fuel discharge passage. In this case, if the pressure adjustment method that uses fuel is carried out when the resin is uncured, part of the resin will melt into the fuel (gasoline, shellulose), and the pressure control valve after adjustment will leak. It may be defective.

Therefore, a structure in which a pipe is press-fitted into the fuel discharge passage without using resin can be considered. However, in the structure in which the pipe is press-fitted in this way, when the specifications of the pipe are changed, the jigs in all the steps of the control valve manufacturing process are changed without exception.

When shellulose is used as a fuel when the pressure adjusting operation of the pressure control valve is performed, the worker's hands become rough and an irritating odor is produced, which may affect the human body. is there.

An object of the present invention is to provide a control pressure adjusting method and device for a pressure control valve, which can perform an adjusting operation by air without using fuel.

[0013]

According to a control pressure adjusting method for a pressure control valve of the present invention, a housing is divided into a control valve chamber and an atmospheric chamber by a diaphragm, and a fluid introducing into the housing is connected to the control valve chamber. The flow path and the fluid discharge path are formed, and the spherical valve body mounting part is mounted on the inlet side of the fluid discharge path, and the spherical valve body that is interlocked with the diaphragm is formed.The diaphragm is controlled by the spring mounted in the atmosphere chamber. In the control pressure adjusting method for the pressure control valve biased to the valve chamber side, air is introduced into the control valve chamber from the fluid introduction passage of the pressure control valve to detect the pressure in the control valve chamber, and in this state The elastic force of the spring is adjusted, and when the detected pressure value reaches a set pressure value, the adjustment of the elastic force of the spring is stopped.

[0014]

According to the above-mentioned means, the elastic force of the spring is adjusted while holding the pressure control valve and monitoring the pressure in the control valve chamber by introducing air from the fluid introduction passage into the control valve chamber, When the pressure value in the control valve chamber reaches a preset pressure value, the adjustment work of the spring is stopped. Therefore, the pressure adjustment work in the control valve chamber can be performed by air without using liquid such as fuel.

[0015]

1 is a circuit diagram showing a control pressure adjusting device for a fuel pressure control valve according to an embodiment of the present invention, FIG. 2 is a partially omitted front view thereof, and FIG. 3 is a partially omitted side view thereof. 4 is a vertical sectional view showing a fuel pressure control valve.

In the present embodiment, the control pressure adjusting device according to the present invention is configured to perform an adjusting operation for the control pressure at which the fuel pressure control valve provided in the fuel supply passage of the automobile is operated. There is.

In the present embodiment, the fuel pressure control valve 10, which is an object of the control pressure adjusting method, is provided with a die-cast housing 11, a diaphragm 12, and a spherical valve body 13, and the housing 11 has a fuel introduction passage. 14 and a fuel discharge passage 15 are opened, and a control valve chamber 16 is formed between the passages 14 and 15. A pipe connection port 15a is formed on the outlet side of the fuel discharge path 15, and a return pipe 17 connected to a fuel tank is connected to the pipe connection port 15a.

A valve spring 18, which is a coil spring, is fitted in the middle portion of the fuel discharge passage 15, and a spherical valve body 13 is inserted on the inlet side. The spherical valve body 13 is configured by using a steel ball (sometimes referred to as a ball), and is configured to be seated on and separated from the valve seat surface 26 having a concave spherical surface.

The diaphragm 12 constitutes a part of the wall surface of the control valve chamber 16, and is fixed to the flange portion 19 of the housing 11 together with the case 21 constituting the atmosphere chamber 20.
A holding hole 22 is formed in the center of the diaphragm 12, and a receiving tool 23 is mounted in the holding hole 22. One end of the receiver 23 is in contact with the spherical valve body 13, and the other end of the receiver 23 is fixed to a support plate 24 in contact with the diaphragm 12.

A return spring 25, which is a coil spring, is interposed between the support plate 24 and the end surface wall of the case 21 in a stored state. The spherical valve body 13 is constantly pushed by the biasing force of the return spring 25 in the direction of closing the inlet side of the fuel discharge passage 15.

When fuel is supplied into the control valve chamber 16 and the pressure in the control valve chamber 16 increases, the diaphragm 12 moves toward the atmosphere chamber 20 side against the urging force of the return spring 25. Is becoming At this time, the spherical valve body 13 is moved to the diaphragm 12 side by the urging force of the valve spring 18 and is separated from the valve seat surface 26.
The inlet side of the fuel discharge passage 15 is opened. That is, the fuel introduction path 14 and the fuel discharge path 15 are in a valve open state in which they are communicated with each other via the control valve chamber 16. By this valve opening operation, the fuel pressure is controlled to be constant.

Next, the structure of the control pressure adjusting device according to this embodiment, which is used for adjusting the control pressure of the fuel pressure control valve 10 thus constructed, will be described.

A control pressure adjusting device 30 for a fuel pressure control valve according to this embodiment includes a box-shaped main body 31 (only a part of which is shown), and the main body 31 is provided at the bottom thereof. Wheels (not shown) are mounted and configured to be movable. Various measuring instruments and the like (not shown) are housed in the main body 31.

A flat plate-shaped base 32 is provided on the upper part of the main body 31, and a holding device 33 is installed on the base 32. The holding device 33 is configured to be capable of detachably holding the fuel pressure control valve (hereinafter, referred to as a control valve) 10. That is, the holding device 33 includes a clamping device 34 composed of an air cylinder device or the like, and the clamping device 34 clamps the control valve 10 as a work.

Near the holding device 33, one end of a pipe 35 as an air feeding path is provided.
Is the fuel introduction path 1 of the control valve 10 held by the holding device 33.
4 is detachably fluidly connected.
With this pipe 35, air is introduced into the control chamber 16 of the control valve 10 from the fuel introduction passage 14 through the pipe 35.

The pipe 35 is constructed by using a relatively long rubber hose, and the elastic force of the rubber hose absorbs the pulsation in a specific frequency band generated during the pressure adjusting work by air which will be described later. ..

A pressure gauge 36 as a pressure detector is connected to the pipe 35. The pressure gauge 36 is connected to the pipe 3.
By measuring the pressure of 5, the control chamber 1 of the control valve 10
The pressure in 6 is substantially detected.

A controller, which will be described later, is connected to the output terminal of the pressure gauge 36, and the pressure gauge 36 measures the control room 1
The pressure value in 6 is transmitted to the controller 37 in real time.

On the other hand, the other end of the pipe 35 is connected to an air feeding circuit 37 as an air feeding device. The air supply circuit 37 includes an air pipe 38.
A variable flow rate control valve 39, a variable volume flow rate control valve 40, an air pressure pilot type switching valve 41, a micro mist filter 42, an air filter 43, a digital pressure sensor 44, a precision pressure control valve 45 in the middle of the pipeline of 8. , Air tank 46,
A pressure gauge 47, a pressure control valve 48, and a filter 49 are provided. The air pipe 38 is connected to the factory air supply source.

The air pressure pilot type switching valve 41 is always closed and is configured to open when the pilot air circuit 50 is switched. The pilot circuit 50 of the switching valve 41 includes a pipe 51, a solenoid valve 52, a pressure gauge 5
3, equipped with a pressure adjusting valve 54 and a filter 55,
It is designed to be connected to the factory air supply. The solenoid valve 52 normally turns off the switching valve 41, and when the solenoid is excited by a command from a controller described later or a switch operation of an operator, the solenoid valve 52 is switched to turn on the switching valve 41. It is configured.

An air circuit 56 for driving the clamping device 34 in the holding device 33 is branched from the pilot air circuit 50. This air circuit 5
6 is connected to a cylinder device as the clamping device 34, and an electromagnetic valve 57 is interposed in the middle thereof. This solenoid valve 57 is normally used for the clamping device 34.
Is retracted, and when the solenoid is excited by a command from a controller which will be described later or a switch operation by an operator, the switching operation is performed to operate the clamping device 34.

On the other hand, the main body 31 is equipped with a spring force adjusting device 60. The spring force adjusting device 60 includes a servo motor 61 such as a stepping motor, and the servo motor 61 is disposed right above the holding device 33 in the vertical direction and supported by the main body 31. Although detailed description and illustration are omitted, the servo motor 61 is configured to move the push rod 63 up and down via a conversion device 62 that converts rotational motion into linear motion.

A crushing head 64 is connected to the lower end of the push rod 63, and the crushing head 64 is configured to crush the control valve 10 as a work through a jig 65 as the push rod 63 descends. Has been done. As a result, the ceiling wall of the case 21 of the control valve 10 is crushed.
When the ceiling wall is crushed, the axial length of the return spring 25 is shortened, so that the elastic force of the return spring 25 is increased. That is, the spring force adjusting device 60 substantially adjusts the elastic force of the return spring 25 by crushing the case 21 of the control valve 10.

A controller 66 is connected to a drive control circuit (not shown) of the servo motor 61. The controller 66 is composed of a microcomputer and the like, and software is programmed in the controller 66 so as to realize the sequence and operation described later. Further, the controller 66 is provided with a reference value setting unit 67 including a memory, a comparing unit 68, and a command unit 69, and these operations are realized.

The servo motor 61 has an encoder 7
0 is installed, and the encoder 70 is the servo motor 6
The operation stroke of 1 is detected and transmitted to the controller 66.

Next, a method for adjusting the control pressure of the pressure control valve, which is an embodiment of the present invention, will be described for the case where the control pressure adjusting device for the pressure control valve having the above-mentioned configuration is used.

First, the control valve 10 to be adjusted is set in the holding device 33 and held by the clamping device 34. At this time, the solenoid valve 57 is switched and air is supplied to the clamping device 34 by the air circuit 56.

When the operating pressure of the control valve 10 is adjusted to a preset pressure, the solenoid valve 52 is excited and switched. By this switching operation, the pilot type switching valve 41 is switched. At this time, the flow rate of the air sent from the pipe 35 to the control valve 10 is controlled by the flow rate control valves 39, 40.
Is controlled to be constant.

The air flowing into the control valve 10 receives the fuel exhaust passage 1
5 is released into the atmosphere. Then, the air pressure in the control valve 10 is measured by the pressure gauge 36, and the measured value is transmitted to the controller 66 in real time.

On the other hand, when the control valve 10 as a work is held by the holding device 33, for example, the servo motor 61 is operated by the sequence control by the controller 66, and the push rod 63 is moved forward by a preset stroke. , Retreated again. At this time, the stroke of the servo motor 61 is monitored by the encoder 70, and the feedback control of the servo motor 61 is performed.

By this forward / backward movement, the ceiling wall of the case 21 in the control valve 10 is crushed and is appropriately pressed by the head 64. By this operation, the spherical valve element 13 of the control valve 10 is set to the regular position.

Next, the servo motor 61 is operated again, and the push rod 63 is gradually moved forward. With this forward movement, the ceiling wall of the case 21 in the control valve 10 is gradually crushed by the crushing head 64 via the crushing jig 65.

When the case 21 is crushed, the return spring 25 is shortened, so that the elastic force of the return spring 25 is increased. When the elastic force of the return spring 25 is increased, the force that pushes back the diaphragm 12 against the air pressure in the control chamber 16 increases. As a result, the air pressure in the control chamber 16 rises relatively,
The rising air pressure is measured by the pressure gauge 36. The measurement value of the pressure gauge 36 is transmitted to the controller 66 in real time.

The controller 66 is
The current air pressure value transmitted from the pressure gauge 36 is compared with a predetermined control pressure value preset in the memory 67, and when the current air pressure value matches the control pressure value, a predetermined control is performed. Generate a signal.

When a predetermined control signal is generated from the comparison section 68, the command section 69 sends a backward operation command to the servo motor 61. The servo motor 61 stops forward movement and retreats according to this command.

With the above operation, the return spring 2
The resilience of No. 5 is set so that the relationship with the air pressure value of the control chamber 16 has a preset relationship. And
By setting the air pressure value of the control chamber 16 so as to be related to the control pressure value of the control valve 10, the control pressure value of the control valve 10 can be set.

According to the above embodiment, the following effects can be obtained. Since the pressure adjustment work of the fuel pressure control valve can be adjusted by using air without using fuel, it is not necessary to configure the control pressure adjustment device of the pressure control valve to chemical resistant specifications, and the Fire Defense Law Need not be taken into consideration, and can be configured similarly to general equipment.

Since no fuel is used, the pressure adjusting work can be performed without adversely affecting the human body when performing the control pressure adjusting method of the fuel pressure control valve.

Since dust and the like due to residual liquid do not adhere to the fuel pressure control valve, it is possible to prevent malfunction of fuel pressure control due to dust and the like.

Since the control valve 10 can be configured so that the pipe 17 is press-fitted into the fuel discharge path 15 last, even if the specifications of the pipe 17 are changed, only the jig for press-fitting the pipe is required. be able to.

The pipe 3 connected to the fuel introduction passage 14
By configuring 2 with a rubber tube, the pipe 35 can absorb the pulsation according to the vibration frequency of the ball 13, for example, the frequency of 400 Hz, so that the air is pumped to the control valve 10. At this time, even if the ball 13 vibrates, the pulsation due to this vibration is generated in the pipe 35.
It is possible to prevent the sound from being generated due to the pulsation.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, in the above-mentioned embodiment, the case where the pressure adjusting method is automatically executed by the controller is explained. However, even if the operator monitors the pressure value of the pressure gauge and adjusts the spring force, Good.

The adjustment of the spring force is not limited to the case where the case 21 of the control valve 10 is deformed, but may be performed by advancing and retracting the adjusting bolt.

[0055]

As described above, according to the present invention,
The adjustment work of the control pressure of the pressure control valve can be adjusted by using air without using fuel.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a control pressure adjusting device for a fuel pressure control valve that is an embodiment of the present invention.

FIG. 2 is a partially omitted front view thereof.

FIG. 3 is a partially omitted side view thereof.

FIG. 4 is a vertical sectional view showing a fuel pressure control valve.

[Explanation of symbols]

10 ... Fuel pressure control valve, 11 ... Housing, 12 ... Diaphragm, 13 ... Spherical valve body (steel ball, ball), 14 ... Fuel introduction passage, 15 ... Fuel discharge passage, 15a ... Pipe pressure inlet,
16 ... Control valve chamber, 17 ... Return pipe, 18 ... Valve spring, 19 ... Flange portion, 20 ... Atmosphere chamber, 21 ...
Case, 22 ... holding hole, 23 ... receiving member, 24 ... support plate,
25 ... Return spring, 26 ... Seating surface, 30 ... Fuel pressure control valve setting pressure adjusting device, 31 ... Main body, 32 ... Base, 33 ... Holding device, 34 ... Clamping device, 35 ...
Pipe, 36 ... Pressure gauge, 37 ... Air feeding circuit (air feeding device), 38 ... Air piping, 39 ... Variable flow control valve, 40
... minute variable flow rate control valve, 41 ... air pressure pilot type switching valve 42 ... micro mist filter, 43 ... air filter, 44 ... digital pressure sensor, 45 ... precision pressure control valve, 46 ... air tank, 47 ... pressure gauge, 48 ... Pressure control valve, 49 ... Filter, 50 ... Pilot air circuit, 51
... Pipe, 52 ... Electromagnetic valve, 53 ... Pressure gauge, 54 ... Pressure control valve, 55 ... Filter, 56 ... Air circuit, 57 ... Electromagnetic valve, 60 ... Spring force adjusting device, 61 ... Servo motor, 62 ... Motion conversion device , 63 ... Push rod, 64
... crushing head, 65 ... crushing jig, 66 ... controller,
67 ... Memory, 68 ... Comparison section, 69 ... Command section, 70 ...
Encoder.

Claims (3)

[Claims] 1. A housing is divided into a control valve chamber and an atmosphere chamber by a diaphragm, and a fluid introducing passage and a fluid discharging passage communicating with the control valve chamber are formed in the housing, and an inlet side of the fluid discharging passage is formed. In the control pressure adjusting method of the pressure control valve, the spherical valve body mounting portion in which the spherical valve body interlocking with the diaphragm is mounted is formed, and the diaphragm is biased toward the control valve chamber side by the spring mounted in the atmosphere chamber. , The pressure in the control valve chamber is detected by introducing air from the fluid introducing passage of the pressure control valve into the control valve chamber, and in this state, the elastic force of the spring is adjusted so that the detected pressure value is the set pressure. Method for adjusting the control pressure of the pressure control valve, characterized in that the adjustment of the elastic force of the spring is stopped when the value is reached. 2. A housing is divided into a control valve chamber and an atmosphere chamber by a diaphragm, and a fluid introduction passage and a fluid discharge passage communicating with the control valve chamber are formed in the housing, and an inlet side of the fluid discharge passage is formed. In a control pressure adjusting device for a pressure control valve, a spherical valve body mounting portion in which a spherical valve body interlocking with a diaphragm is mounted is formed, and the diaphragm is urged toward the control valve chamber side by a spring mounted in the atmosphere chamber. An air feeding device that feeds air from the fluid introduction path to the control valve chamber, a pressure detector that detects the pressure of air in the control valve chamber, a holding device that holds the pressure control valve, and a holding device. Compare the detected pressure value of the pressure detector with the set value, and adjust the spring force when the detected pressure value reaches the set value. Control pressure adjustment device of the pressure control valve, characterized in that a controller for stopping the adjustment of the device. 3. The pressure control valve according to claim 2, wherein pulsation absorbing means for absorbing pulsation of a specific frequency component is inserted between the fluid introduction passage and the air feeding device. Control pressure regulator.