JPH03149473A - Automatic pressure control valve device with temperature correcting function - Google Patents

Abstract

PURPOSE:To facilitate the control of forced-feed pressure of a fluid without stopping the entire device by regulating the flow passage area of a control valve part capable of being engagedly moved with a diaphram by the control air introduced into a control pressure chamber defined by the diaphram through an air control valve. CONSTITUTION:To a fluid pressure chamber 57 on one side defined by a diaphram 56, an inflow port 52 of a fluid, and outflow ports 53, 54 are provided, and also a control valve part 13 for regulating the flow passage area of the inflow port 52 in interlock with the displacement of the diaphram 56 is provided. On a control pressure chamber 58 side on the other side, a plurality of disk-spring type bimetal spring 28 with a temperature correcting function are laminatedly arranged to normally energize the control valve part 13 in the valve-closing direction. Thus, the control air regulated at a prescribed pressure by the operation of an air control valve 48 (not shown) is fed into the control pressure chamber 58 through an introducing port 55 to change the energizing force of the diaphram 56 against the spring force of the bimetal springs 28 and the fluid pressure inside the fluid pressure chamber 57, allowing the forced-feed pressure of the fluid to be controlled.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an automatic pressure regulating valve device with a temperature correction function, which is installed in the middle of a flow path through which fluid such as paint is fed under pressure, and adjusts the secondary pressure of the fluid.

[Prior Art 1] This type of automatic pressure regulating valve device with a temperature correction function is known, for example, from Japanese Patent Application No. 63-284 filed earlier by the present applicant.
As proposed in No. 223 (hereinafter referred to as prior art),
There are those shown in FIGS. 3 and 4. Figure 4 shows an example in which this automatic pressure regulating valve device is installed in a painting device. The bomb 1 is connected to the spray gun 5, which will be described later, via the pressure-feeding piping 2.
It is connected to the. Reference numeral 3 denotes an automatic coating machine consisting of a reciprocator and the like, and the automatic coating machine 3 is equipped with a lifting arm 4 that moves upward and downward.
A spray gun 5 is attached to the elevating arm 4, and the spray gun 5 moves upward and downward as the elevating arm 4 moves upward and downward. The automatic coating machine 3 is installed along a conveyor line along which objects to be coated (not shown) are conveyed. Reference numeral 6 denotes an automatic pressure regulating valve device with a temperature correction function installed near the paint pressure feeding bomb 1 in the middle of the pressure feeding piping 2, and the automatic pressure regulating valve device 6 with a temperature correction function has the configuration shown in FIG. have. That is, 7 is a casing forming the outer shell of the pressure regulating valve device 6, and the casing 7 is located at the top in the figure.
It is divided into lower parts and is composed of an upper casing part 7A and a lower casing part 7B. The upper casing part 7A has an inlet 8 formed to protrude upwardly into a tubular shape, and two outlet ports 9, 10 are provided at opposing positions on the lower side. Note that a pressure gauge (not shown) is connected to one outlet 10. Lower casing part 7B
A female threaded portion 11 into which a pressure adjustment screw 33 (to be described later) is screwed is formed on the lower side thereof, and a flange portion 12 that contacts the upper casing portion 7A is formed on the upper side. Reference numeral 13 denotes a regulating valve part provided at the inlet 8 of the upper casing part 7A, and the regulating valve part 13 is inserted from below into the reduced diameter step part 8A formed on the inner peripheral surface of the inlet 8 and locked therein. and a valve seat 14 whose upper side becomes the valve seat surface, and a valve seat 14 that fixedly supports the valve seat 14 from below (is press-fitted or screwed into the inflow port 8 from below, and touches the lower surface of the valve seat 14). Contacted cylindrical valve seat support 1
5, which is inserted through the valve seat support 15 and the valve seat 14, and whose downstream side is fixed to an upper backing plate 23, which will be described later,
A valve stem 16 that moves up and down according to the displacement of a diaphragm 19, which will be described later, and a valve body sabot that is inserted into the upper end of the valve stem 16.
A device 19 includes a spherical valve body 18 that is fixedly supported by a valve rod 17 and moves toward and away from the valve seat 14 in conjunction with the upward and downward movements of the valve stem 16. The diaphragm 19 and the upper casing part 7A define a fluid pressure chamber 20 that applies fluid pressure to the diaphragm 19, and the diaphragm 19 and the lower casing part 7A define a fluid pressure chamber 20 that applies fluid pressure to the diaphragm 19. The portion 7B defines a spring chamber 21 in which a bimetal spring 28, etc., which will be described later, is installed. 22 is an armchair attached to the diaphragm l9, and the armchair 22 has an upper part in the center thereof. It has an upper convex part 23A and a lower convex part 23B extending downward, and the upper convex part 23
The lower end of the valve stem l6 is inserted into A, and the lower convex portion 23B is fitted into the upper cover plate 23 provided from above the diaphragm l9 through the diaphragm 19, and the lower convex portion 23B of the upper cover plate 23. a lower abutment plate 24 which is brought into contact with the diaphragm l9 from the lower side of the diaphragm l9 and which holds the diaphragm l9 between the upper abutment plate 23 and the lower abutment plate 24 in pressure contact with the upper abutment plate 23; The nut 25 is screwed onto the lower protrusion 23B of the upper cover plate 23.
Further, 26 is a contact ball attached to the tip of the lower part 23B of the upper cover plate 23, and the contact ball 26 is brought into contact with a spring receiver 27 (described later), and a force that urges the spring receiver 27 upward is applied. Uke is now stopped. Reference numeral 27 denotes a spring receiver installed in the spring chamber 2l. The spring receiver 27 is formed into a cylindrical shape with a lid, and a flange portion 27A for supporting the lower end of a bimetal spring 28, which will be described later, is formed at the lower end of the spring receiver 27. 28, the upper end of the spring receiver provided on the lower casing part 7B side is connected to the ring 2-9, and the lower end of the spring receiver 2 is
The bimetal springs 28 are each supported on the side of the flange portion 27A of the spring 7. The bimetal spring 28 is constructed by laminating a plurality of disc spring-shaped bimetals 28A in opposite directions. As a result, the bimetal spring 28 is supported by the lower casing part 7B, and the spring receiver 27 is moved downward (adjusting valve part 1
3) in the valve closing direction). Note that the bimetal spring 28 is set so that the spring force becomes stronger as the temperature rises. Reference numeral 30 denotes a spring installed in the spring receiver 27, and the spring 30 has its lower end supported by a spring seat 31 supported on the lower casing portion 7B side.
The upper end contacts the upper end lid portion 27B within the spring receiver 27, and urges the spring receiver 27 upward (in the valve opening direction of the regulating valve portion 13). Here, the spring force of the spring 30 is set larger than the spring force of the bimetal spring 28, so that the armature 22 of the diaphragm 19 is always urged upward. As a result, the regulating valve section 1
3 is in a normally open valve state. Further, 32 is a spring that urges the armature 22 downward.
2 is set to a moderately weak spring force that can suppress vibration of the armature 22. Reference numeral 33 denotes a pressure adjustment screw screwed into the female threaded portion 11- of the lower casing portion 7B, and a spring seat 31 is swingably supported at the upper end of the pressure adjustment screw 33 via an abutment ball 34. ing. Here, looking at the force relationship acting on the armature 22, an upward biasing force is exerted by the elastic force of the spring 30 via the spring receiver 27, and on the other hand, the elastic force of the bimetallic spring 28 is applied via the spring receiver 27. The pressure of the fluid flowing into the fluid pressure chamber 20 is applied to the diaphragm 19,
The pressing force acting through the armature 22 acts as a downward biasing force. As a result, the diaphragm 19
The armchair 22 is supported so as to be able to be displaced upwardly and downwardly by the biasing forces of both of them, and the opening degree of the regulating valve portion 13 is adjusted to an optimal value by the fluid pressure within the fluid pressure chamber 20. When the entire painting apparatus is operated, the paint pressure-feeding pump 1 is operated to force the paint to be fed through the pressure-feeding piping 2 to the spray gun 5, and the automatic coating machine 3 is operated to move the paint upward and downward on the arm 4. The spray gun 5 is moved upward and downward by the movement to spray the paint onto the object to be painted. At this time, the pressure of the paint flowing through the pressure-feeding pipe 2 is adjusted by the automatic pressure regulating valve device 6 with a temperature correction function. That is, in the automatic pressure regulating valve device 6 with a temperature correction function, paint flows into the fluid pressure chamber 20 from the valve seat support 15 via the normally open regulating valve section 13 of the device, which is composed of the inlet 8, and flows into the fluid pressure chamber 20 from the outlet port 8. 9 to the spray gun 5. At this time, the pressure of the paint that has flowed into the fluid pressure chamber 20 pushes the diaphragm 19 downward, and this biasing force and the bimetal spring 2
8 and the biasing force of the spring 30, the armchair 22 and the spring receiver 27 are displaced to the optimum position, and the adjustment valve portion 13 is adjusted to the optimum opening degree. Further, when the temperature of the paint increases and changes, the temperature is transmitted to the bimetal spring 28 via the casing 7, and the spring force changes to become stronger, causing the regulating valve part 13 to adjust to the optimum opening degree according to the decrease in the viscosity of the paint. adjust. Also. When the temperature of the paint decreases, it acts in the opposite direction to that described above, and adjusts to the optimum opening according to the increase in the viscosity of the paint. This ensures constant pumping pressure regardless of temperature changes. On the other hand, if the shape of the object to be painted or the moving speed of the conveyor line that conveys the object changes, and the pressure for pumping the paint is adjusted accordingly, first,
Stop the automatic coating machine 3 and turn the adjusting screw 33 of the automatic pressure regulating valve device 6. In other words, if you want to increase the pumping pressure, screw in the adjusting screw 33 to compress the spring ring 30, and then release the spring 30. By increasing the load, the release pressure of the paint increases. [Problems to be Solved by the Invention] By the way, in the above-mentioned conventional technology, even if the paint temperature changes, the pumping pressure can be automatically maintained at a constant state. In other words, when adjusting the pumping pressure of the paint according to the type of paint, the moving speed of the conveyor line, etc., the entire device must be stopped and the discharge pressure adjusted manually using the adjustment screw 33. This poses a problem in that the original work is stopped while the adjustment work is carried out, resulting in a decrease in work efficiency and productivity. The present invention has been made in view of the problems of the prior art described above, and aims to provide an automatic pressure regulating valve device with a temperature correction function that can easily adjust the pumping pressure without stopping the entire device. purpose. [Means for Solving the Problems] The configuration adopted by the present invention to solve the above-mentioned problems includes a casing, a diaphragm that divides the inside of the casing into two into a fluid pressure chamber and a control pressure chamber, and a An inlet and an outlet are provided in the casing to allow fluid to flow through the chamber, and an inlet and an outlet are provided on the fluid pressure chamber side in conjunction with the diaphragm, and the inlet and outlet are provided in conjunction with the diaphragm in conjunction with the displacement of the diaphragm. A regulating valve part that adjusts a flow path cross-sectional area, a spring receiver located on the control pressure chamber side and fixed to the diaphragm, and a plurality of disc spring-shaped bimetals between the spring receiver and the casing. A bimetal with a temperature correction function, which is arranged by laminating sheets, always biases the regulating valve part in the valve closing direction, and whose spring force increases as the temperature of the fluid flowing in the fluid pressure chamber increases. A spring, a control pressure introduction port provided in the casing to introduce control air into the control pressure chamber, and control air introduced from the control pressure introduction port and acting on the diaphragm to control the bimetallic spring. The air control valve includes an air control valve that adjusts the cross-sectional area of the flow path of the adjustment valve portion against the spring force and the fluid pressure acting on the diaphragm within the fluid pressure chamber.

[Operation J] With the above configuration, when adjusting the pressure for pumping fluid, the pressure of the control air supplied to the control pressure chamber by the air control valve is adjusted, and the force with which the control air urges the diaphragm is changed. As a result, the pumping pressure can be easily adjusted without stopping the entire device. Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 and 2. FIG. 2 shows a coating apparatus according to the present embodiment, and the coating apparatus is composed of a paint pressure-feeding bomb 41, a pressure-feeding piping 42 connected to the paint pressure-feeding pump 41, and a lifting arm, almost the same as in the prior art. 43 and a spray gun 45 attached to a lifting arm 43. Reference numeral 46 denotes an automatic pressure regulating valve device with a temperature correction function of this embodiment, and the automatic pressure regulating valve device 46 is attached to the lifting arm 43 near the spray gun 45.
a pressure regulating valve 47 that moves up and down in conjunction with the pressure regulating valve 4;
7 and an air control valve 48 that supplies control pressure to the air control valve 7. Since the pressure regulating valve 47 moves up and down in conjunction with the spray gun 45, even if the primary pressure (head pressure) of the pressure regulating valve 47 fluctuates, the spray gun 45, which is the secondary pressure of the pressure regulating valve 47, The pressure transmitted to the spray gun 45 is always maintained at a constant pressure, so that the spray gun 45 can spray a fixed amount of paint. On the other hand, the air control valve 48 is connected to a pressure regulating valve 47 via a control air supply pipe 49. 50 is an air source such as a compressor that supplies control air to the pressure regulating valve 47; the control air pressure from the air source 50 is manually or automatically adjusted to a desired set pressure by the air control valve 48; The pressure is supplied to the pressure regulating valve 47 via 49. Here, the pressure regulating valve 47 is configured as shown in FIG. 1, and the overall configuration of the pressure regulating valve 47 is almost the same as the prior art automatic pressure regulating valve device 6 described above. Identical members are given the same reference numerals and their explanations will be omitted. Reference numeral 51 designates the casing of this embodiment, and the casing 51 is divided into an upper part and a lower part in the figure as in the prior art, and is composed of an upper casing part 51A and a lower casing part 51B. has an annularly shaped outflow port 52 above it, and two inflow ports 53 and 54 are provided at opposing positions below. Note that a pressure gauge (not shown) is installed at one outlet 54.
is connected. The lower casing part 51B is provided with a control pressure introduction port 55 in its lower part, and the control pressure introduction port 55
A control air supply pipe 49 is connected to the control air supply pipe 49, and is connected to the construction control well 48 via this control air supply pipe 49. Note that the upper casing part 51A includes a valve seat 14 and a valve seat support 1 that constitute the regulating valve part 13, similar to those in the prior art.
5, a valve stem 16, a valve body support 17, a valve body 18, etc. are provided. 56 is the upper casing part 51A and the lower casing part 51
The diaphragm 56 and the upper casing part 51A define a fluid pressure chamber 57 that applies fluid pressure to the diaphragm 56. The side casing portion 51B defines a control pressure chamber 58 in which the control pressure introduced from the control pressure introduction port 55 acts on the diaphragm 56. Reference numeral 59 denotes an armature of this embodiment attached to the diaphragm 56. The armature 59 includes an upper cover plate 60 having an upper protrusion 60A and a lower protrusion 60B, and a lower cover plate 60 that holds the diaphragm 56 between the upper cover plate 60 and the upper protrusion 60A and the lower protrusion 60B. It is composed of a backing plate 61 and a nut 62 for fixing the lower backing plate 61 to the upper backing plate 60. Note that a spring receiver 63 is attached to the lower convex portion 62B via a nut 65, which will be described later. Reference numeral 63 denotes a spring receiver located within the control pressure chamber 58 and fixed to the lower plate 61. The spring receiver 63 is formed into a cylindrical shape with a lid, as in the prior art, and has a bimetal spring 2 at its lower end.
A flange portion 63A supporting the lower end is formed at the upper end lid portion 63B, and a ventilation hole 64 for supplying control air pressure from the control pressure introduction port 55 to the lower surface of the diaphragm 56 is inserted into the upper end lid portion 63B. A screw hole 65 is formed. The lower end 62B of the spring receiver 63 is inserted into the screw hole 65, and is fixed to the armature 59 by screwing a nut 66. A bimetal spring 28 is supported between the ring 29 and the flange portion 63A of the spring receiver 63 in the spring receiver provided in the lower casing portion 51B, and in this embodiment, a bimetal spring 28 is supported between the ring 29 and the flange portion 63A of the spring receiver 63. 30 is not provided, and the regulating valve portion 13 is always urged in the valve closing direction by the spring force of the bimetal spring 28, and the valve body 18 is fixed to the valve seat 14. Furthermore, 67 is a bimetal adjustment spring installed in the spring receiver 63, the lower end of the spring 67 is supported on the lower casing part 51B side, and the upper end is supported by the spring receiver 63.
3 and urges the spring receiver 63 upward. Note that the spring force of the bimetal adjustment spring 67 according to this embodiment is much smaller than the spring force of the bimetal spring 28, and is set to an extent that gives an initial load to the bimetal spring 28. The automatic pressure regulating valve device 46 of this embodiment is constructed as described above, but the entire operation of the painting device to which the automatic pressure regulating valve device 46 is attached is performed by the paint pressure pump 41, as in the prior art. is activated to force the paint to be fed to the spray gun 45 via the pressure feeding piping 42, and when the automatic coating machine 44 is activated, the spray gun 45 is moved up and down together with the lifting arm 43, and the paint is sprayed onto the object to be painted. . On this occasion,
The pressure of the paint flowing through the pressure-feeding pipe 42 is adjusted by the automatic pressure regulating valve device 46 with a temperature correction function. However, in this embodiment, in the automatic pressure regulating valve device 46 with a temperature correction function, the control air controlled to a desired pressure by the air control valve 48 is supplied to the pressure regulating valve 47 via the control air supply distribution 49. By being supplied to the control pressure introduction port 55, the regulating valve section 13 is opened and the secondary pressure of the paint is controlled. That is, in the pressure regulating valve 47 receiving the control air, the pressure in the control pressure chamber 58 is increased by the control air, and the guyafour ram 56 is pushed up, thereby opening the regulating valve portion 13. Then, the paint flows into the fluid pressure chamber 57 from the inlet 52 via the regulating valve section 13, and from the outlet 53 to the spray gun 45.
will be pumped to. At this time, the pressure of the paint flowing into the fluid pressure chamber 57 pushes the diaphragm 56 downward and the biasing force of the bimetal spring 28, and the control air pressure inside the control pressure chamber 58 pushes the diaphragm 56 upward. Due to the antagonism of
The spring receiver 63 displaces the armature 59 to the optimum position,
The regulating valve section 13 is adjusted to the optimum opening degree. On the other hand, when the temperature of the paint changes, the temperature is transmitted to the bimetal spring 28, and as in the prior art, the regulating valve part 13
Adjust the opening to the optimum degree according to changes in paint viscosity. This ensures that the spray gun 4
5 is ensured at a constant flow rate. When changing the secondary side pressure of the paint to the optimum condition according to various conditions such as conveyor line conveyance speed, type of paint, paint temperature, size and shape of the object to be coated, the air control valve 4
8 manually or automatically to remotely change the control air pressure supplied to the control pressure chamber 58 of the pressure regulating valve 47 to a desired value. As a result, the pressure of the fuel in the fluid pressure chamber 57 changes, and the pressure fed to the spray gun 45 is changed to a desired value. As described above, the paint pumping bomb 41, the automatic coating machine 44,
The pumping pressure can be easily adjusted without stopping the entire device including the air source 50. As a result, even when changing the conveyance speed of a conveyor line that conveys objects to be coated in short cycles, it does not take much time to change the pumping pressure, and work efficiency is greatly improved. In addition, in this embodiment, the pressure regulating valve 47 is connected to the automatic coating machine 44.
Since it is installed near the spray gun 4-5 attached to the lifting arm 43 of Can be set to a constant value. In the above embodiment, the air control valve 48 was explained as a mechanical device that adjusts it manually or automatically, but it may also be configured to be adjusted programmatically using a computer or the like. A large number of them may be connected in parallel and sequence control may be performed. Further, the automatic coating machine 44 is not limited to a reciprocator, and other devices such as a coating robot may be used.

【Effect of the invention】

As detailed above, according to the present invention, control air is introduced into the fluid pressure chamber defined by the diaphragm in the casing via the air control valve, and the air pressure of the control air is applied to the diaphragm. The cross-sectional area of the flow path in the regulating valve part is adjusted against the spring force of the bimetal spring and the fluid pressure acting on the diaphragm in the fluid pressure chamber, so when a temperature change occurs in the paint, the bimetal spring Not only can the secondary side pressure of paint be automatically adjusted to maintain a constant amount of paint sprayed from a spray gun, etc., but the entire equipment can be stopped simply by adjusting the control air using the air control valve. Therefore, the pumping pressure can be easily adjusted, and even when changing the pumping pressure in a short cycle, it does not take much time, greatly improving work efficiency.

[Brief explanation of the drawing]

Figures 1 and 2 relate to embodiments of the present invention; Figure 1 is a longitudinal sectional view showing a pressure regulating valve of an automatic pressure regulating valve device with a temperature compensation function; and Figure 2 is an automatic pressure regulating valve with a temperature compensation function. A configuration diagram showing a painting device equipped with a valve device, FIGS. 3 and 4 are related to the prior art, FIG. 3 is a vertical sectional view showing an automatic pressure regulating valve device with a temperature correction function, and FIG. 4 is a diagram showing a temperature correction function. FIG. 2 is a configuration diagram showing a coating device equipped with a functional automatic pressure regulating valve device. 7...Casing, 8...Inlet, 9.10-...
Outlet, 13... Regulating valve part, 19... Diaphragm, 28... Bimetal spring, 48... Air control valve,
55... Control pressure inlet, 63... Spring receiver.

Claims (1)

[Claims] a casing; a diaphragm that divides the inside of the casing into a fluid pressure chamber and a control pressure chamber; an inlet and an outlet provided in the casing to allow fluid to flow through the fluid pressure chamber; an adjustment valve part that is provided on the pressure chamber side in conjunction with the diaphragm and adjusts the flow passage cross-sectional area of the inlet in conjunction with the displacement of the diaphragm; and an adjustment valve part that is located on the control pressure chamber side and is fixed to the diaphragm. A plurality of disc spring-like bimetal plates are stacked between a spring receiver provided as a spring receiver and the casing, and a plurality of disc spring-shaped bimetal plates are stacked together to constantly bias the regulating valve portion in the valve closing direction, and the fluid A bimetal spring with a temperature correction function that increases the spring force as the temperature of the fluid flowing inside the pressure chamber increases, and a control pressure introduction port provided in the casing to introduce control air into the control pressure chamber. By introducing control air from the control pressure inlet and acting on the diaphragm, the flow of the regulating valve portion is increased against the spring force of the bimetal spring and the fluid pressure acting on the diaphragm in the fluid pressure chamber. An automatic pressure regulating valve device with a temperature correction function, consisting of an air control valve that adjusts the cross-sectional area of the road.