JPH0678673U - Pressure control valve - Google Patents

Abstract

(57) [Summary] [Purpose] The first chamber R1 is operated by the action of the diaphragm 23.
In the pressure regulating valve that maintains the hydraulic pressure in the inside at a predetermined value,
The liquid tightness between the inside of the chamber R1 and the outside through the outflow pipe 25 is improved at low cost. [Structure] A cylindrical short tube 26 is press-fitted and brazed on the inner circumference of the upper end of the outflow pipe 25. A cylindrical valve seat member 27 is press-fitted and fixed on the inner circumference of the short pipe 26, and the valve action of the valve seat member 27 and the valve body 32 fixed to the central portion of the diaphragm 23 causes the pressure in the first chamber R1 to rise. Is adjusted. The short tube 26 is a pressed product produced by drawing a flat plate and then cutting the flat plate. Even if the flat plate does not have a good surface roughness, the short tube 26 has a good surface roughness during press working. It Therefore, both the liquid tightness between the short pipe 26 and the outflow pipe 25 and the liquid tightness between the short pipe 26 and the valve seat member 27 become good.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention keeps the pressure of a fluid pumped from a pump and supplied to another device constant, for example, the fuel pressure used for an electronically controlled fuel injection device of an automobile is kept constant at the fuel injection valve. Regarding pressure control valve.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as shown in FIG. 2, a pressure regulating valve of this type has first and second shells 11 and 12 which are cup-shaped and are overlapped with each other so that their openings face each other to form a space inside. , A diaphragm 13 fixed at the peripheral portion between the first and second shells 11 and 12 to divide the space into the first and second chambers R1 and R2, and a first portion assembled to the side portion of the first shell 11 A cylindrical bush 14 that opens toward the chamber R1 and forms an inlet, and is assembled to the bottom of the first shell 11 and projects toward the diaphragm 13 in the first chamber R1 to form an outlet. The outflow pipe 15, a cylindrical valve seat member 16 having an opening surface pressed into the upper portion of the outflow pipe 15 and directed toward the center of the diaphragm 13, and the diaphragm 13 so as to face the opening surface of the valve seat member 16. Inside the second chamber R2, there is a valve body 17 that is assembled in the central portion and that opens and closes a flow path formed between the bush 14 and the outflow pipe 15 according to the displacement of the diaphragm 13 in cooperation with the valve seat member 16. And a spring 18 supported by the bottom surface of the second shell 12 at one end and supported by the diaphragm 13 at the other end. The pressure inside the device communicating with the first chamber R1 and the bush 14 is The pressure is maintained at a predetermined level according to the biasing force.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional apparatus, the valve seat member 16 is usually made of stainless steel, and when the member 16 is brazed to the outflow pipe 15, the valve is subjected to heat treatment (about 1000 ° C) during brazing. Since the seat member 16 deteriorates and the surface roughness of the seat surface deteriorates, the member 16 needs to be press-fitted into the outflow pipe 15. On the other hand, in the outflow pipe 15, since it is necessary to form a long plate, the flat plates are rounded and the ends thereof are joined by welding, so that the welded part of the outflow pipe 15 rises, that is, so-called welding. A bead is generated. Therefore, a slight gap is formed between the outer peripheral surface of the valve seat member 16 and the inner peripheral surface of the outflow pipe 15, and the liquid tightness between the first chamber R1 and the outside through the outflow pipe 15 deteriorates. Further, the surface roughness of the outflow pipe 15 depends on the surface roughness of the flat plate as a material, and in order to improve the liquid tightness between the first chamber R1 and the outside through the outflow pipe 15, the flat surface of the flat plate is required. Roughness must be good, leading to high manufacturing costs. The present invention has been made to address the above problems, and an object thereof is to provide a pressure regulating valve having favorable liquid tightness and reduced manufacturing cost.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the structural feature of the present invention is that a short pipe is press-fitted and brazed onto the upper inner circumference of the outflow pipe, and a valve seat member is press-fitted into the short pipe. It is in.

[0005]

[Operation and effect of the device]

 In the present invention constructed as described above, the short pipe is press-fitted into the outflow pipe and brazed, and the valve seat member is press-fitted into the short pipe. If the liquid tightness can be kept good, the liquid tightness between the inside of the pressure control valve and the outside through the outflow pipe will be good. In this case, since the short tube can be composed of a pressed product that can be manufactured by stretching a flat plate by pressing and then cutting it, the surface roughness of the short tube can be processed by pressing without using a flat plate with good surface roughness. Will be good. In addition, since no weld bead is generated unlike the conventional device, the liquid tightness between the valve seat member and the short pipe is improved. Therefore, according to the present invention, the liquid tightness between the inside of the pressure regulating valve and the outside through the outflow pipe can be improved at a low manufacturing cost.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a pressure regulating valve according to the embodiment in a front sectional view. This pressure regulating valve has cup-shaped first and second shells 21 and 22, and the shells 21 and 22 are stacked so that their openings face each other to form a space inside. ing. A diaphragm 23 is fixed between the first and second shells 21 and 22 by caulking the end portions of the shells 21 and 22 at the peripheral edge thereof, and the diaphragm 23 has the space described above. Is partitioned into first and second chambers R1 and R2.

A bush 24 is attached to the side surface of the first shell 21. The bush 24 is connected to the fuel supply passage side that pumps the fuel from the fuel pump to the fuel injection valve and constitutes an inlet for the first chamber R1. An outflow pipe 25 is vertically attached to the central portion of the bottom surface of the first shell 21. The outflow pipe 25 penetrates the bottom surface of the first shell 21 and is fixed to the bottom surface at the outer peripheral surface, and the upper end surface of the pipe 25 faces the diaphragm 23. On the inner circumference of the upper end of the outflow pipe 25, a cylindrical short pipe 26 is press-fitted and brazed. The short tube 26 is a pressed product manufactured by drawing a flat plate by a press and then cutting it. A cylindrical valve seat member 27 made of stainless steel is press-fitted and fixed onto the inner circumference of the short pipe 26, and the upper end surface of the valve seat member 27 is open toward the center of the diaphragm 23.

A holding body 31 is attached to the center of the diaphragm 23, and the holding body 31 supports a valve body 32 facing the upper end surface of the valve seat member 27. The valve element 32 is formed in a flat plate shape, and the lower surface of the valve element 32 is seated on the upper end surface of the valve seat member 27, and the ball 33 is fixed to the upper surface thereof. The downward displacement of the ball 33 is restricted by a holding plate 34 that is caulked and fixed to the holding body 31.

A spring 35 is housed in the second chamber R2. The spring 35 is supported at its upper end by the bottom surface 22a of the second shell 22, and at its lower end by a spring receiver 36 which is caulked and fixed to the holder 31. Further, a negative pressure introducing pipe 37 is attached to the second shell 22 and the second chamber R2 communicates with the intake pipe of the engine through the negative pressure introducing pipe 37.

Next, the operation of the pressure regulating valve configured as described above will be briefly described. If the force that pushes up the diaphragm 23 due to the fuel pressure in the first chamber R1 is greater than the combined force obtained by subtracting the force that pushes down the diaphragm 23 due to the spring 35 from the force that pulls up the diaphragm 23 due to the negative pressure in the second chamber R2, , The diaphragm 23 moves upward, and the valve element 32 separates from the upper end surface of the valve seat member 27. Therefore, the fuel in the first chamber R1 flows to the fuel tank side through the outflow pipe 25 and the inside of the first chamber R1. The fuel pressure drops. On the other hand, if the force that pushes up the diaphragm 23 due to the fuel pressure in the first chamber R1 is smaller than the combined force, the diaphragm 23 moves downward and the valve element 32 is seated on the upper end surface of the valve seat member 27. The fuel in the first chamber R1 is confined, and the fuel pressure in the first chamber R1 is increased by the fuel flowing through the bush 24. Due to the actions of the diaphragm 23 and the valve element 32 as described above, the fuel pressure in the first chamber R1 is determined, and the pressure in the fuel supply passage is maintained at a predetermined pressure.

In the pressure regulating valve operating in this manner, the short pipe 26 is formed by pressing a flat plate, and the short pipe 26 is manufactured at low cost. As a side effect of the pressing, even if the flatness of the flat plate as a material is not good, the flatness of the short tube 26 becomes good because the flat plate is stretched by a punch or the like. The liquid tightness between the pipe 26 and the valve seat member 27 becomes good. On the other hand, since the short pipe 26 is press-fitted into the outflow pipe 25 and brazed, the liquid tightness between the short pipe 26 and the outflow pipe 25 is also kept good. As a result, it is possible to manufacture a pressure regulating valve that has good liquid tightness between the inside of the first chamber R1 and the outside through the outlet pipe 25 at low cost.

[Brief description of drawings]

FIG. 1 is a front sectional view of a pressure regulating valve showing an embodiment of the present invention.

FIG. 2 is a front sectional view of a conventional pressure control valve.

[Explanation of symbols]

21 ... 1st shell, 22 ... 2nd shell, 23 ... Diaphragm, 24 ... Bushing, 25 ... Outflow pipe, 26 ... Short pipe, 27 ... Valve seat member, 31 ... Holding body, 32 ... Valve body, 35
... spring, R1 ... first chamber, R2 ... second chamber.

Claims (1)

[Scope of utility model registration request] 1. A first cup-shaped member, which is overlapped so that its openings face each other to form a space therein.
And a second shell, a diaphragm fixed between the first and second shells at the peripheral edge to divide the space into the first and second chambers, and the first shell provided on a side portion of the first shell. An inflow port opened toward one chamber, an outflow pipe assembled to the bottom portion of the first shell and protruding toward the diaphragm in the first chamber to form an outflow port, and an upper portion of the outflow pipe. Cooperation between a cylindrical valve seat member that is assembled and has an opening surface toward the center of the diaphragm, and the valve seat member that is assembled to the center of the diaphragm so as to face the opening surface of the valve seat member. A valve body that opens and closes a flow path formed between the bush and the outflow pipe according to the displacement of the diaphragm, and is supported in the bottom of the second shell by being accommodated in the second chamber and at one end. Re and a pressure regulating valve and a spring which is supported on the diaphragm at the other end,
A pressure regulating valve, characterized in that a short pipe is press-fitted and brazed onto an upper inner circumference of the outflow pipe, and the valve seat member is press-fitted into the short pipe.