JPH0276975A - Pressure regulating valve - Google Patents

Abstract

PURPOSE:To improve pressure feed performance and actuation reliability through stabilization of a pressure on the pressure feed pipe side as well as ensurance and stabilization of a pressure on the pressure chamber side by a method wherein, in a pressure regulating valve applicable to a pressure feed device, a fluctuation in a pressure is prevented from propagation by means of a valve for discharging an over pressure and a valve for feeding a pressure. CONSTITUTION:Through a relation action between a valve 5 for feeding a pressure and a valve 3 for discharging an over pressure, a specified pressure in a pressure feed pipe A is automatically fed to a pressure chamber B to ensure a desired minimum pressure in the pressure chamber B. An over pressure exceeding a set pressure in the pressure chamber B is automatically discharged to a discharge system to set a desired maximum pressure in the pressure chamber B. A pressure Pb in the pressure chamber is automatically controlled in a given range, and a fluctuation in a pressure in the pressure chamber is not propagated in a pressure feed chamber. A maximum pressure control range in the pressure chamber is regulated through the energizing forces of springs 4 and 6.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pressure regulating valve applied to a pressure supply device of a compression pressure generating device in an air spring device or the like that drives an exhaust valve of a diesel engine. .

(Prior Art) A conventional example of the compression pressure generating device will be explained with reference to FIG. 3. It has a compression chamber (pressure chamber) (B) in which the pressure repeatedly fluctuates, and the compression chamber (B) has a constant pressure. Pressure supply pipe (A) Connected via K orifice, pressure supply pipe (A)
A constant pressure is applied from the orifice (q) to the compression chamber (
B) Equipped with a pressure supply device supplied with K.

(Problems to be Solved by the Invention) In the conventional pressure supply device, the pressure supply pipe and the pressure chamber (compression chamber) are connected via an orifice, so that pressure fluctuations on the pressure chamber side affect the pressure supply. It is transmitted to the tube and causes pulsation,
When the temperature of the pressure supply pipe increases and liquid such as oil enters the pressure chamber from the outside, the compression pressure inside the pressure chamber increases excessively, causing the compression piston's operating mode to change or the compression amount pressure to increase. This causes problems such as the strength of the pressure chamber.

The present invention was developed to address the above-mentioned problems, and its purpose is to automatically supply constant pressure to the pressure chamber on the pressure supply pipe side, and to prevent overpressure on the pressure chamber side. automatic discharge and propagation of pressure fluctuations to the pressure supply pipe side? It is an object of the present invention to provide a pressure supply valve that prevents the above problems, secures and stabilizes the pressure on the pressure chamber side, and also stabilizes the pressure on the pressure supply pipe side, thereby improving pressure supply performance and operational reliability.

(Means for Solving the Problems) The present invention is a pressure regulating valve that is interposed and connected between a pressure supply pipe that supplies a constant pressure and a pressure chamber that repeatedly fluctuates in pressure. A housing that has a connection port on the pipe side, a connection port on the pressure chamber side, and a discharge port on the discharge system side, and a housing that is placed inside the housing and resists the spring bias when the pressure on the pressure chamber side becomes overpressure above the set pressure. An overpressure discharge valve that slides to open an overpressure discharge path between the pressure chamber side connection port and the discharge port, and an overpressure discharge valve that is arranged inside the overpressure discharge valve so that the pressure on the pressure chamber side is connected to the pressure supply pipe side. The structure is characterized by a pressure supply valve that opens the pressure supply path between the two connection ports by sliding against the spring bias in the opposite direction when the pressure becomes lower than the pressure. The overpressure discharge valve is activated by the pressure drop on the pressure chamber side to open the pressure supply path and supply constant pressure to the pressure chamber to ensure the desired minimum pressure. The pressure inside the pressure chamber is automatically controlled within the desired range by opening the circuit and discharging the nuclear overpressure into the exhaust system, and both valves prevent pressure fluctuations on the pressure chamber side from propagating to the pressure supply pipe side.

(Function) When the pressure on the pressure chamber side becomes lower than the constant pressure on the pressure supply pipe, the pressure supply bulk is actuated against the spring bias to open the pressure supply passage, and the pressure on the pressure supply pipe side is Pressure is supplied to the pressure chamber through the pressure supply path to ensure the desired minimum pressure in the pressure chamber, and when the pressure chamber becomes overpressure higher than the set pressure, the overpressure discharge valve resists the spring bias. When activated, the overpressure discharge path is opened, and the overpressure is discharged to the discharge system through the discharge port, and the pressure within the pressure chamber is automatically controlled within the desired range. The pressure inside the pressure chamber is corrected and stabilized without being transmitted to the supply pipe side, and the pressure inside the pressure supply pipe is also stabilized.

(Example) An example of the present invention is shown in FIGS. 1 and 2, and (
la, b) are the housing members (1a) and (1b) screwed together and connected (thus, the housing formed), (2a) is the pressure supply pipe (A) protruding from the housing member (1a) side
(1111 connection port, (211+) is the housing member (
lb) Pressure chamber (B) @ connection port in contact with @, (described)
is a discharge system (
D) N discharge port, (3) is housing member (la) (
lb) inside (slidably arranged 9 overpressure discharge/signals,
(4) is the spring biasing (
4a) t, nine springs (4) and (5) are overpressure discharge valves (
3) a pressure supply valve slidably arranged in (6);
) closes the pressure supply valve (5) @ (spring biased (6b)
A pressure regulating valve a1 is a spring on the opposite side of the upper side, and is interposed and connected between a pressure supply pipe (g) that supplies a constant pressure and a pressure chamber (of a pressure chamber that repeatedly fluctuates), Pressure supply W
A housing (Ia, b) having a connection port (2a) on the (A) side, a connection port (21) of the pressure chamber (B) @), and a discharge port (2d) of the discharge system (D)l; , N
When the pressure on the pressure chamber (Bl side) becomes overpressure above the set pressure, it slides against the spring bias (4a) and opens the pressure chamber (Bl).
) side connection port (2b) and the overpressure discharge path (
7) When the overpressure discharge valve (3) opens and the pressure in the pressure chamber (B) @ located inside the overpressure discharge valve (3) becomes 4 lower than the pressure in the pressure supply pipe (AIN), the reverse direction Both connection ports (2a) (Zt
)) The pressure regulating valve α0 is equipped with a pressure supply valve (5) that opens the pressure supply path (8a, b, c) between the two.

The overpressure discharge valve (3) is slidably disposed in the cavity of the trap housing member (1a) as shown in the figure, and the interior of the inner cavity of the connection port (2a) is sealed by the seal member button, and the housing is closed. An overpressure discharge path (7) that is opened and closed between the connection port (2b) and the discharge port (2A) is formed between the inner wall of the member (1b), and the pressure supply mellow (5) is configured to discharge overpressure. It is slidably arranged in the cavity of the discharge valve (3) to seal the cavity from the sealing member 9, and is inserted into the central hole (8a) penetrated through the center of the overpressure discharge valve (3). Pressure supply paths (8a, b) are provided opposite to each other, and are capable of communicating with the connection port (2b) via the passageway (8C) by providing an opening/closing path (8b) between the overpressure discharge valve (3) and the inner wall of the cavity. , c), and the spring (4) is interposed between the housing member (1a) and the overpressure discharge valve (3) and biases the valve (3) in the direction of the arrow (4a).
) to close the overpressure outlet (force), and the spring (6)
A pressure supply path (8a, b, c) are closed, and the spring (6) is pressed against the spring bias (4a) of the spring (4).
) is adjusted to a moderately small spring bias (6b) in the opposite direction.

Therefore, when the fluctuating pressure (Pb) on the pressure chamber (B) side becomes lower than the constant pressure (Pa) of the pressure supply pipe (A), the pressure supply valve (5) is activated by the spring bias (6b) K. The opening/closing path (8b) is closed by moving to the left in the figure, and the pressure (Pa) on the pressure supply pipe (A) side is transferred from the connection port (2a) to the pressure supply paths (13a, b).

C), is supplied to the pressure chamber (B) via the connection port (2b),
The overpressure discharge valve (3) closes the overpressure discharge path (7), and the desired minimum pressure (Pa) is ensured.

When the pressure (Pb) in the pressure chamber (B) increases against a constant pressure (Pa ) of the pressure supply W The supply valve (5) is moved to the right as shown to keep the pressure supply paths (8a, b, c) closed, and the overpressure discharge valve (3) is moved to the right as shown against the spring bias (3a) to release the overpressure. The discharge path (7) is closed, and the overpressure in the pressure chamber (B) is discharged from the connection port (2b) through the overpressure discharge path (7) and the discharge port (2i) to the discharge system (D), and the pressure chamber Overpressure in (B) is automatically eliminated.

When the pressure (Pb) in the pressure chamber (Bl) decreases below the set value, the overpressure discharge valve (3) is activated and the pressure supply valve (5) is activated due to the balance of the spring bias (4a) (41)). As shown in Figure 1, the overpressure discharge path (7) and pressure supply path (8a) are restored.

b, a) are automatically closed and the pressure in the pressure chamber (Bl (
Pb), +! 1″-The internal pressure within the desired range is automatically controlled.

The pressure supply valve (5) and the overpressure discharge valve (3)
Due to the related operation, a constant pressure of the pressure supply pipe (A) is automatically supplied to the pressure chamber (B), and the desired minimum pressure in the pressure chamber (B) is secured, and the set pressure in the pressure chamber (B) is exceeded. The overpressure in the pressure chamber is automatically discharged to the discharge system, and the desired liquid level in the pressure chamber (B) is set, and the pressure in the pressure chamber (Pb) is automatically controlled within a predetermined range, and the pressure fluctuation in the pressure chamber is adjusted to the pressure supply. It doesn't get transmitted indoors. The maximum pressure control range in the pressure chamber is determined by the spring (4
) and (6) are adjusted by the biasing force.

(Effects of the Invention) The present invention has the above-described configuration, and when the pressure on the pressure chamber side decreases, the pressure supply valve is operated and the pressure supply path is closed, and a certain level of pressure on the pressure supply pipe side is maintained. Pressure is automatically supplied into the pressure chamber to ensure the desired minimum pressure, and when the pressure on the pressure chamber side becomes overpressure above the set pressure, the overpressure discharge valve is activated and the overpressure discharge path is closed. , the overpressure in the pressure chamber side is discharged from the discharge port to the discharge system, the pressure in the pressure chamber is automatically controlled within the desired range, and the pressure in the pressure chamber above the desired minimum pressure is released to the pressure supply pipe side by both valves. This prevents pulsation and temperature rise on the pressure supply pipe side, prevents overpressure on the pressure chamber side, corrects and stabilizes the pressure on the pressure chamber side, and stabilizes the pressure on the pressure supply pipe side. The pressure supply performance and operational reliability have been significantly improved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a layout diagram of the present invention, and FIG. 3 is a mechanical diagram of a conventional example. A: Pressure supply pipe B: Pressure chamber la, t+: Housing 2a, 2b: Connection port 2d:
Discharge port 3: Overpressure supply valve 5: Pressure supply valve 4a, 6b: Spring biased 7: Overpressure discharge path
ga, b, c: Royal power supply route agent: Patent attorney: Shige Okamoto, 2 other persons

Claims (1)

[Claims] A pressure regulating valve that is interposed and connected between a pressure supply pipe that supplies a constant pressure and a pressure chamber that repeatedly fluctuates in pressure, and that has a connection port on the pressure supply pipe side, a connection port on the pressure chamber side, and A housing that has a discharge port on the discharge system side, and a connection port and a discharge port on the pressure chamber side that are placed inside the housing and slide against the spring bias when the pressure on the pressure chamber side becomes overpressure above the set pressure. An overpressure discharge valve that opens an overpressure discharge passage between A pressure regulating valve comprising a pressure supply valve that slides to open a pressure supply path between the two connection ports.