JPH0334284Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spray gun such as a spray gun for painting, and in particular, to a spray gun that enables spraying by opening the valve while constantly supplying pressurized liquid at a constant pressure to the valve chamber of the spray gun. The invention relates to a spray gun.

When supplying pressurized liquid at a constant pressure to a spray gun, conventionally, the pressurized liquid supplied from a pump was sent to the spray gun through a supply pipe, and a special pipe was installed in the middle of the supply pipe. A pressure regulating device is provided to keep the supply pressure constant while sensing changes in the pressure upstream of the valve as the valve opens and closes in the spray gun. Conventional pressure regulators are large and heavy, and are usually installed separately from the spray gun.

According to the above-mentioned conventional technology, since the spray gun and the pressure regulator are installed at separate locations through a relatively small diameter pipe line, the pressure response in the pressure regulator tends to be delayed, and the pressure regulator Also, there is a disadvantage that equipment such as pipes and joints is complicated.

Therefore, an object of the present invention is to provide a spray gun that can spray while supplying pressure-regulated liquid while reducing response time.
Another object of the present invention is to provide a spray gun having a pressure regulating function with a small size and simple structure.

In order to achieve the above object, the present invention connects diaphragm-based pressure regulators in a stacked manner to the main body of the spray gun near the valve device, thereby shortening the distance between the on-off valve and the outlet of the pressure regulator. With,
It is characterized by omitting pipe lines and joints.

Hereinafter, embodiments shown in the accompanying drawings will be described in detail.

The spray guns to which this invention is applied include:
For example, as shown in FIGS. 1 and 2, it generally consists of a gun base A, an atomizing head B, and a valve driving part C provided before and after the gun base A, and the gun base A is a block-shaped body. A valve chamber 2 is provided near the front end of the member 1, and a valve device 5 consisting of a valve seat 3 and a valve 4 that opens and closes by advancing and retracting with respect to the valve seat 3 is provided at the tip of the valve chamber 2, and an atomizing head. A liquid spray nozzle 6 and an annular atomizing air nozzle 7 are provided in front of the valve seat 3 and an annular atomizing air nozzle 7 are provided coaxially on the outer periphery thereof as B, and a block-shaped cylinder is provided at the rear of the main body member 1 as a valve drive portion C. The member 8 and the cover member 9 are attached in a stacked state by bolts 10, 10, and a piston 12 is provided in the air cylinder 11 of the cylinder member 8 so as to be always kept in a forward direction by a spring 13.
The valve 4 is connected to the valve 2 so as to be kept closed at all times, thereby forming a valve drive mechanism for opening and closing the valve 4, and as needed, the air cylinder 11
By supplying pressurized air to the piston 12 and the valve 4 connected thereto against the spring 13, the piston 12 and the valve 4 connected thereto are retracted and opened, and the main body member 1 is provided with a pressurized liquid flow communicating with the valve chamber 2. In addition to providing an inlet 14, an inlet 15 communicating with the air nozzle 7 is provided so that pressurized liquid such as paint is constantly supplied from the inlet 14 to the valve chamber 2 during use. By simultaneously supplying pressurized air to the air nozzle 7 through the inlet 15, the valve device 5 is opened and the liquid jet from the nozzle 6 is inflated by the pressurized air from the air nozzle 7. We will adopt an air spray type spray gun that uses a spray method to atomize and spray it forward.

The above-mentioned spray gun is not particularly different from a conventional spray gun, but as a special configuration of the present invention for the above-mentioned spray gun, for example, as shown in the figure, the spray gun is supplied to the peripheral side where the inlet 14 of the main body member 1 is located. The pressurized liquid pressure regulator 16 is connected to its secondary outlet 17.
The pressure regulating device 1 is tightened and fixed by bolts 18, 18 in a stacked state in which the pressure regulating device 1 communicates with the inlet 14 in the main body member 1.
6 includes the inlet 19 as the primary side and the outlet 17 as the secondary side, as well as the inlet 19.
A main body 24 is provided with a valve device 23 consisting of a valve seat 20 and a valve 22 that tends to be closed by a spring 21 between the main body 24 and the outlet 17, and a relay chamber member 27 that has a relay chamber 25 and a vent hole 26 to the outside air. and a pressure regulation chamber member 30 having the control air inlet 28 and the pressure regulation chamber 29.
The bolts 18, 18 and 18 are superimposed so that the diaphragms 31 and 32 are interposed between the respective members.
18 to be tightened and attached to the main body member 1, and the two diaphragms 31 and 32 are brought into contact with each other at the center by respective contact pieces 33 and 34 so as to interlock, thereby forming a double diaphragm mechanism. It is desirable to adopt a pressure reducing valve in which the diaphragm 31 on the main body 24 side and the valve 22 are connected by a valve stem 35.

The operation of the pressure regulator 16 will be explained as follows.
When the valve 4 at the gun base A is closed as shown in FIG. In order to maintain a balance between the secondary hydraulic pressure and the control air pressure, the primary pressurized liquid is supplied from the inlet 19 to the valve by opening and closing the valve 22, regardless of pressure fluctuations in the primary pressurized liquid. Through the device 23, the secondary side, that is, the inside of the valve chamber 2, is maintained at a constant pressure that is approximately the same as the control air pressure.
When the pressurized liquid inside is ejected from the nozzle 6, the pressure inside the valve chamber 2 decreases, and the pressure inside the pressure regulating chamber 29 causes the diaphragm 32, the contact pieces 34, 3 to
3. Under the intervention of the diaphragm 31, the valve 22 is driven in a direction away from the valve seat 20 against the spring 21, and when the valve device 23 is opened, the pressure liquid on the primary side flows from the inlet 19 to the valve device 23. , flows into the secondary side, that is, the valve chamber 2, through the outflow port 17 and the inflow port 14, and the valve device 23 automatically maintains the pressure on the secondary side at the pressure set by the control air pressure in the pressure regulating chamber 29. The valve device 2 is maintained at an appropriate opening degree, and therefore immediately responds to the presence and extent of consumption of pressurized liquid in the valve chamber 2 due to spraying.
3 is opened and closed, the secondary side pressure, that is, the liquid pressure in the valve chamber 2 is kept constant, and the liquid pressure injected from the nozzle 6 is always kept constant.

In addition, a double diaphragm is installed in the pressure regulating chamber 29.
Even if there is a sudden change in the internal pressure or the pressure on the secondary side of the main body 24 and the diaphragm is deformed, this is absorbed in the relay chamber 25 and the influence on the other side is alleviated, resulting in a fast response. This allows stable pressure adjustment function to be achieved.

As the valve 4 in the valve device 5, a needle valve may be adopted as shown in Fig. 3, and the flow rate may be minutely adjusted depending on the degree of advance and retreat of the needle valve.If such a needle valve is adopted, the pressure adjustment When cleaning the inside of the device 16 and the spray device at the time of color change, it is desirable to increase the opening degree of the valve device 5, and as shown in FIG. In addition to adopting a relatively weak spring 13, a spring receiving member 36 for this spring 13 is provided to connect it to a spring 3 that is stronger than the spring 13.
Not only is the stopper 7 constantly pressed forward to the position where it is blocked by the stopper 38, but also a stopper 39 for adjusting the opening is provided, the tip of which corresponds to the spring receiver member 36, and the spring receiver member 3
6 is provided with a stopper 40 for adjusting the opening, the tip of which corresponds to the piston 12, and the cylinder 1
Regarding the pressurized air for 1, in the illustrated rest state, the spring receiving member 36 is pressed forward by the spring 37 and blocked by the stopper 38, and the spring 13, which serves as a foothold, pushes the piston 12 and the needle valve. 4 is pushed forward to close the valve device 5, and for spraying, a strong spring 39 is pressed forward.
The low-pressure air that does not reach the pressing force of the cylinder 11
On the other hand, during cleaning, high-pressure air is supplied to the cylinder 11. According to
The piston 12, together with the stopper 40 and the spring receiving member 36, is moved back against the spring 37 to a position where it is blocked by the stopper 39, thereby opening the valve device 5 widely.

In the illustrated embodiment, an air spray type atomizing head B is adopted, but the invention is not limited to this, and an airless spray type atomizing head B can be adopted to perform atomization based on the airless spray method. You can also
Alternatively, a rotary spray type atomizing head B may be employed to atomize by centrifugal force while rotating the cup or disk at high speed.

As explained above, according to the present invention, the pressure regulating device is connected to the main body member of the spray gun in a block stacked manner such that the secondary outlet thereof communicates with the inlet in the valve chamber of the spray gun. Therefore, the distance between the pressure regulator and the valve device in the spray gun is significantly shortened compared to the conventional system in which both are installed separately, and therefore the pressure can be adjusted with quick response and stability. The spray function can be achieved evenly under the pressure and flow rate.
Moreover, stacking them in a block shape allows for a simple structure and miniaturization, and is convenient for replacement.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a perspective view and a vertical side view showing a spray gun of the present invention in one embodiment, respectively, and FIG. 3 is a vertical side view of only the main parts in another embodiment. 1...Body member, 2...Valve chamber, 3...Valve seat, 4
... Valve, 5 ... Valve device, 6 ... Nozzle, 14 ...
Inflow port, 16...Pressure adjustment device, 17...Secondary side outflow port, 20...Valve seat, 22...Valve, 23...Valve device, 28...Control air inlet, 29...Pressure regulation Chamber, 31...Diaphragm, 32...Diaphragm, A...Gun base, B...Atomization head, C...Valve drive unit.

Claims (1)

[Scope of utility model registration request] A gun base A, an atomizing head B and a valve drive unit C are separately arranged before and after the gun base A, and the gun base A has a valve chamber 2 in a main body member 1 and a valve seat 3 at the tip thereof. and a valve device 5 consisting of a valve 4,
The valve 4 is connected to a valve drive mechanism in the valve drive unit C so that it can be opened and closed by advancing and retreating, and the front of the valve device 5 is communicated with a nozzle 6 for spraying liquid in the atomization head B. Furthermore, an inlet 1 communicating with the valve seat 2 is provided on the circumferential side of the main body member 1.
4, the pressurized liquid flowing in from the inlet 14 is sprayed while being ejected from the nozzle 6 in the atomization head B when the valve device 5 is opened by the operation of the valve drive section C. On the circumferential side of the main body member 1, a pressure regulating device 16 consisting of a pressure reducing valve using a diaphragm is coupled to a portion near the inlet 14 in a stacked manner so that the secondary outlet 17 communicates with the inlet 14. The pressure regulating device 16 includes a valve device 23 consisting of a valve seat 20 and a valve 22 between the primary inlet 19 and the secondary outlet 17, and a control air inlet 28. A pressure chamber 29 is provided in a state opposite to the secondary outlet 17 side with the intervention of a diaphragm 31 in the diaphragm mechanism, and the diaphragm 31 connects it to the valve 22 to open the secondary outlet 17 side. Pressure adjustment chamber 29
A spray gun combined with a pressure regulator is configured to open and close a valve device 23 by moving a valve 22 forward and backward while interlocking with a diaphragm 31 so as to maintain a pressure corresponding to control air.