JPH0564911U - Valve structure of paint pressure reducing valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a valve structure of a paint pressure reducing valve that does not cause sheet leakage due to clogging of dust. [Structure] A cemented carbide ball valve 10 seated on a seat 9 arranged on the pump chamber side of a diaphragm 5 arranged in the valve body 1,
Formed integrally with the support rod 8 protruding in the center of the diaphragm 5, dust in the paint that has clogged the sheet 8 part is pushed up by the pressure applied to the diaphragm and is crushed by the carbide ball valve, and sheet leakage Prevent.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve structure of a paint pressure reducing valve for adjusting the paint pressure by operating air or a pressure adjusting spring in the field of automatic painting.

[0002]

[Prior Art]

Generally, in order to supply paint to a spray gun for painting, a paint pressure reducing valve is attached to the outlet of the paint pump to reduce the paint pressure to about 0.5 kg / cm ² . In this case, in automatic machines such as reciprocators and painting robots, the attached automatic gun moves up and down, so the amount of paint discharged from the automatic gun changes due to the height difference, especially with electrostatic painting. Therefore, it is important to maintain the discharge rate.

Therefore, in these automatic machines, a paint pressure reducing valve is attached to the hand of an automatic gun to prevent a change in the discharge amount, but the method of adjusting the pressure is mainly performed by operating air. In these paint pressure reducing valves, if dust adheres between the valve and the seat and causes a sheet defect, so-called needle up (a state in which paint cannot be depressurized) is caused. A valve structure has been used to prevent this.

[0004]

[Problems to be solved by the device]

 As a typical example of the conventional example, when the ball valve b and the diaphragm c housed in the valve body a are directly connected by a gate-shaped member d as shown in FIGS. In addition, the ball valve b is pulled up by the pulling force of the diaphragm c to shut off the passage. In this case, the passage system becomes complicated, machining is difficult, and it is not suitable as a paint pressure reducing valve for electrostatic painting using high voltage because metal parts are used.

There is also a system in which a diaphragm c and a valve e are integrated as shown in FIG. 5, and a valve seat made of urethane is made to bite a valve e made of metal to seat, but in this type, a valve seat is used. Although it itself uses urethane resin, which has good abrasion resistance and solvent resistance, it has drawbacks in long-term use. Moreover, since it is entirely made of metal, it is not suitable for electrostatic coating as in the above-mentioned conventional example.

In view of the above situation, the present invention provides a valve structure of a paint pressure reducing valve suitable for the operability of an automatic machine such as a robot by integrating a diaphragm and a super hard ball valve so as to be lightweight and compact. This is the purpose.

[0007]

[Means for Solving the Problems]

 The present invention is a paint pressure-reducing valve that controls the paint pressure by operating air or a pressure-adjusting spring, and has a paint inlet at one end and a paint outlet at the other end between the working fluid chamber and the pump chamber in the valve body. A diaphragm is provided, and a super hard ball valve for seating on a seat provided in the paint passage is integrally formed at the end of a support rod projecting in the center of the diaphragm.

[0008]

[Action]

 As described above, since the cemented carbide ball valve that sits on the seat and the diaphragm are integrated, if a seat defect occurs due to the adhesion of dust between the cemented carbide ball valve and the seat, the pressure applied to the diaphragm due to the leakage of the seat With this, the diaphragm is pushed up and the carbide ball valve integrated with this diaphragm operates so as to crush the dust on the seat, preventing needle rising due to continuous leakage of the seat.

[0009]

【Example】

 The present invention will be described below with reference to the drawings of the embodiments.

FIGS. 1 and 2 show a valve structure of a paint pressure reducing valve to be mounted on an automatic gun in automatic painting, in which 1 is a valve main body having a paint inlet 2 at one end and a paint outlet 3 at the other end. The diaphragm 5 is supported between the working fluid chamber 13 and the pump chamber 14 in the main body 1 by the diaphragm receiver 6 and the diaphragm retainer 7, and the seat 9 is seated at the tip of the support rod 8 protruding in the center of the diaphragm 5. The cemented carbide ball valve 10 is brazed and integrated, and the seat 9 is fixed by a seat retainer 11. Reference numeral 12 is a valve spring that comes into contact with the back portion (paint inflow side) of the super hard ball valve 10.

Explaining this action, first, the diaphragm 5 is deformed by the pressure of the operating air generated in the working fluid chamber 13, and the ultra-soft ball valve 10 of the support rod 8 integrated with the diaphragm 5 is separated from the seat 9. The paint introduced from the paint passage 4 is sucked into the pump chamber 14 on the opposite side, and the inflow is continued until the pressure generated in the working fluid chamber 13 and the pressure generated in the pump chamber 14 on the opposite side are balanced through the diaphragm 5. The paint whose pressure is adjusted accordingly is supplied from the paint outlet 3 to the automatic gun. An adjusting spring may be used instead of the operating air.

Here, when dust in the paint is trapped in the sheet portion, the temporary pressure P1 (pressure at the coating material inlet side) flows into the secondary side that is the pump chamber 14, and the secondary pressure P2 is the actual pressure. Although the set adjustment pressure is exceeded, since the diaphragm 5, the support rod 8 and the super hard ball valve 10 are integrated, the diaphragm 5 operates due to the rise of the secondary pressure P2, and the diaphragm 5 is integrally supported. Since the carbide ball valve 10 at the tip of the rod 8 is pulled up and a force acts so as to make strong contact with the seat 9, dust adhering to the seat 9 portion is crushed and an extreme rise in secondary pressure can be prevented. Therefore, it is possible to prevent needle up due to the leakage of the seat portion. Further, in this case, since the seat portion is made up of the conical seat 9 of cemented carbide and the wear-resistant cemented carbide ball valve 10, the seatability and durability can be improved.

[0013]

[Effect of the device]

 As described above, in the valve structure of the paint pressure reducing valve of the present invention, the diaphragm and the cemented carbide ball valve seated on the seat are integrated with the support rod protruding from the diaphragm. Since the diaphragm forcibly moves it and eats away dust, it has good seat performance and eliminates seat leakage. Therefore, it is possible to prevent the problem from rising. Further, the valve structure is simplified, and it is suitable as a paint pressure reducing valve for automatic machines such as robots, which require miniaturization. Furthermore, structurally, there are no problems in terms of strength, and the metal parts can be made as small as possible by plasticizing, so that it can be used as a paint pressure reducing valve for electrostatic painting using high voltage.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view of a conventional paint pressure reducing valve, in which a ball valve is supported by a gate-shaped member.

FIG. 4 is a vertical sectional side view of the main part.

FIG. 5 is a cross-sectional view of another conventional paint pressure reducing valve.

[Explanation of symbols]

 1 Valve body 2 Paint inlet 3 Paint outlet 4 Paint passage 5 Diaphragm 8 Support rod 9 Seat 10 Carbide ball valve

Claims (1)

[Scope of utility model registration request] 1. A paint pressure reducing valve for controlling the paint pressure by operating air or a pressure adjusting spring, wherein a diaphragm is provided between a working fluid chamber and a pump chamber in a valve body having a paint inlet at one end and a paint outlet at the other end. A valve structure of a paint pressure reducing valve in which a hard-ball ball valve that sits on a seat provided in a paint passage is integrated with the end of a support rod that projects from the center of the diaphragm.