JP2021070202A - External foaming agent supply device - Google Patents

Abstract

To provide an external foaming agent supply device for a foaming machine that can avoid a problem of spray foaming in winter in a field spraying foaming machine and also solve the problem of spraying foaming in summer advantageously.SOLUTION: In an external foaming agent supply device 20 that supplies a foaming agent, which is detachably connected to a first or second supply system 12/14 of a field spray foaming machine 10, a movable carriage (50) includes at least: a foaming agent supply flow path 24 that guides the foaming agent supplied from a foaming agent tank 22 to the first or second supply system 12/14; a pressure gauge 30 that detects a pressure of the supplied foaming agent; a flow control valve 32 that controls a flow rate of the foaming agent; cooling means for cooling the foaming agent flowing in the foaming agent supply flow path 24; and a control device 36 that controls the flow control valve 32 so that a foaming agent supply pressure is higher than a pressure of the first or second liquid.SELECTED DRAWING: Figure 4

Description

The present invention relates to an external foaming agent supply device, and is attached to a foaming machine that sprays a polyurethane foam raw material onto an adherend, particularly at a polyurethane foam spraying foaming site. It relates to a retrofit type foaming agent supply device in which a predetermined foaming agent is externally added.

Conventionally, as an on-site spray foaming machine that is brought to the construction site and used in order to form a polyurethane foam coating layer with a predetermined thickness on an adherend such as a wall surface or ceiling of a building. , A first supply system that pumps a first liquid containing a polyol, a second supply system that pumps a second liquid containing a polyisocyanate, and the first and second supply systems, respectively. A device having a structure having an injection device for mixing and injecting a first and second liquid is known, and for example, an example thereof is clarified in Japanese Patent Application Laid-Open No. 2000-102751. ..

By the way, the temperature of the raw materials isocyanate and polyol and the temperature of the object to be sprayed have a great influence on the formation of the polyurethane foam by the on-site spraying type foaming machine, and the thickness and density of the polyurethane foam layer formed are greatly affected. It is known that it has an adverse effect on such things. For example, during spray foaming in winter when the surrounding temperature is low, the temperature of the object is low even if the spray work is performed on the object (adhesion) such as a cold wall surface. Therefore, problems such as the inability to sufficiently foam the sprayed raw material and the formation of a foam layer having an uneven thickness or the formation of a dense polyurethane foam layer without foaming are caused. Become so.

Therefore, in Japanese Patent Application Laid-Open No. 2014-162146, etc., in order to avoid the influence of temperature when forming such a polyurethane foam layer, the first supply system and the second supply system of the on-site spraying type foaming machine are used. On the other hand, a structure in which a foaming agent supply device for externally adding a predetermined foaming agent is fixedly provided on the foaming machine has been clarified. There is a problem that the foaming agent supply channel is affected by the heat from the equipment of the foaming machine and the supply of the foaming agent becomes unstable, which becomes remarkable especially in the summer.

That is, as a premise of supplying the first liquid and the second liquid in the foaming machine, it is necessary to heat the inside of the flow path for supplying the two liquids with a heater. Therefore, the flow path piping is provided with a heating jacket. In addition, in the case of the control device that controls the foaming machine itself, heat tends to be trapped in the surrounding area, so that the heat is easily trapped in the surrounding area. The external foaming agent supply flow path is designed to be located as far as possible from such heat-generating equipment and heaters, but it is necessary to make it compact as a device, so it is outside. Since the foaming agent supply device for addition is fixedly arranged in the very vicinity of the foaming agent, the influence of heat from the heat generating device, the heater, etc. as described above is unavoidable. is there. For this reason, especially in the summer, the supply flow path of the external foaming agent cannot be sufficiently cooled due to the influence of the heat released from the foaming machine, and therefore the supply of the foaming agent (gas) is not stable. In addition, the foam formed by spraying becomes wavy, where the density distribution in the foam also varies, and the shrinkage difference of the foam between the high density part and the low density part causes a tensile action. Therefore, there was a risk of cracking.

Japanese Unexamined Patent Publication No. 2000-102751 Japanese Unexamined Patent Publication No. 2014-162146

Here, the present invention has been made in the context of such circumstances, and the problem to be solved thereof is to avoid the problem of blowing foaming in winter in the field spraying foaming machine and to avoid the problem in the summer. It is an object of the present invention to provide an external foaming agent supply device for the foaming machine, which can advantageously solve the problem of spray foaming, and another problem is on-site spray foaming. The machine can be easily and easily converted into a normal type without an external foaming agent supply device and a foaming agent external type with an external foaming agent supply device. The purpose is to provide an external foaming agent supply device that can be used.

Then, in order to solve the above-mentioned problems, the present invention can be preferably carried out in various aspects as listed below. It is understood that the aspects or technical features of the present invention are not limited to those described below and can be recognized based on the invention idea that can be grasped from the description of the specification. Should be.

(1) From the first supply system that pumps the first liquid containing the polyol, the second supply system that pumps the second liquid containing the polyisocyanate, and the first and second supply systems, respectively. Connected to the first supply system or the second supply system in a field spraying foaming machine having an injection device that mixes and injects the supplied first and second liquids. Therefore, it can be made into an external foaming agent supply device that supplies a predetermined foaming agent, and can be detachably connected to the first or second supply system and vaporized at room temperature supplied from the foaming agent tank. A foaming agent supply channel that guides the foaming agent to the first or second supply system; the pressure of the foaming agent supplied to the first or second supply system through the foaming agent supply channel is detected. And a flow control valve that controls the flow rate of the foaming agent supplied to the first or second supply system through the foaming agent supply flow path; A cooling means for cooling the foaming agent that is circulated in the foaming agent supply channel; the first or second liquid pumped in the first or second supply system to which the foaming agent supply channel is connected. It has a movable trolley in which at least a control device for controlling the flow control valve is installed so that the foaming agent supply pressure detected by the pressure gauge is higher than the pressure of. , The trolley is moved to the place where the on-site spraying type foaming machine requires the external addition of the foaming agent, and the foaming agent supply flow path is directed to the first or second supply system. An external foaming agent supply device characterized in that the target foaming agent is connected to the site spraying type foaming machine so as to be supplied and added from the outside.
(2) At least a part of the foaming agent supply flow path is composed of a heat conductive tube made of a material having a thermal conductivity of 10 W / mK or more, and the cooling means is arranged on the heat conductive tube. The external foaming agent supply device according to the above aspect (1).
(3) A pump for delivering the foaming agent guided from the foaming agent tank is provided at a portion of the foaming agent supply flow path on the upstream side of the flow control valve, and the pump operation of the pump is transmitted to the control device. The external foaming agent supply device according to the embodiment (1) or (2), wherein the foaming agent supply pressure detected by the pressure gauge is adjusted.
(4) A heater is attached to the foaming agent tank, the heating of the foaming agent tank by the heater is controlled by the control device, and the foaming agent supply pressure detected by the pressure gauge is adjusted. The external foaming agent supply device according to the above aspect (1) or the above aspect (2).
(5) An accumulator is connected to and arranged with respect to the foaming agent supply flow path so as to be located on the upstream side of the flow rate control valve, and the foaming agent guided in the foaming agent supply flow path is the a. The external foaming agent supply device according to any one of the above-described aspects (1) to (4), which can be allowed to flow into the accumulator.
(6) The above-described aspects (1) to (1) to the above-described aspect (1) to (1) to (1) to (1) to The external foaming agent supply device according to any one of the above aspects (5).
(7) The foaming agent tank is arranged on the trolley, and is configured so that the trolley can be moved at the same time together with the foaming agent supply flow path, a pressure gauge, a flow rate control valve, a cooling means, and a control device. The external foaming agent supply device according to any one of the above-described aspects (1) to (5).
(8) The connection between the first or second supply system and the foaming agent supply flow path is performed using a three-way pipe joint, and the two connection ports of the three-way pipe joint are the first or second. It is connected to the first or second liquid pressure feed path of the supply system, and the three-way pipe joint constitutes a part of the liquid pressure feed path, while the remaining one connection port of the three-way pipe joint. On the other hand, the mode (1) to the mode (1) to which the foaming agent supply flow path is detachably connected.
The external foaming agent supply device according to any one of 7).
(9) The pressure of the pressure-fed liquid is applied to the liquid pressure-feeding path on the upstream side of the connection point of the foaming agent supply flow path with respect to the first or second liquid pressure-feeding path in the first or second supply system. The external foaming according to any one of the above aspects (1) to (8), wherein the liquid pressure detecting means for detecting, outputting the detection signal, and inputting the detection signal to the control device is provided. Agent supply device.
(10) A mixer is arranged on the liquid pressure feed path downstream of the connection point of the foaming agent supply flow path with respect to the first or second liquid pressure feed path in the first or second supply system. The first or second liquid to be pumped in the liquid pumping path and the foaming agent supplied through the foaming agent supply flow path are mixed. The external foaming agent supply device according to any one of the aspects (9).

As described above, in the external foaming agent supply device according to the present invention, the external foaming agent supply device is separated from the on-site spray foaming machine, and its main equipment is moved from the place where it is mounted on the trolley to a desired position. Is easily possible and can be placed apart from the various equipment that generates heat in the on-site spraying type foaming machine, so that the influence of heat from the various equipment of the foaming machine can be advantageously avoided. Therefore, the external addition of the foaming agent can be effectively performed. That is, since the supply flow path of the external foaming agent that needs to be cooled is arranged independently of the foaming machine, even if the foaming agent supply device is installed externally, the existing foaming Since it will be installed separately from the machine, its installation position can be selected so that it is not easily affected by the heat generated by the existing foaming machine. By preventing the influence of heat in this way, the foaming agent supply device can be stably cooled even in the summer, and thus foaming by the foaming agent. However, stable and good foam spraying is possible, variation in density distribution can be effectively suppressed, and the occurrence of cracks can be advantageously prevented.

Moreover, since the external foaming agent supply device according to the present invention can be moved by a trolley, it can be easily and easily installed as an external device for a field spraying foaming machine that can only mix two liquids. Therefore, since the foaming agent can be added by external addition, when spraying on an object such as a wall that has become cold due to the environmental temperature, the expansion due to foaming becomes worse and the density is high. This can be effectively suppressed or prevented from occurring due to the difference in density between the lower layer and the upper layer during multi-layer spraying. In addition to the countermeasures, winter countermeasures can also be taken advantagefully.

It is the schematic explanatory drawing which shows an example of the arrangement of the equipment in the on-site spray type foaming machine to which this invention is applied. It is a schematic explanatory drawing which shows an example of the arrangement of the apparatus in the external type foaming agent supply device which follows this invention. It is a schematic explanatory drawing which shows the connection form of the external type foaming agent supply device according to this invention with respect to the liquid pressure feeding path in the field spray type foaming machine, (a) shows the state before connection, (b) is , Indicates the state after connection. It is schematic explanatory drawing which shows the whole form of the apparatus arrangement in the state which the external type foaming agent supply device which follows this invention is connected to the on-site spray type foaming machine. It is a schematic explanatory drawing which shows an example of the form in which the external foaming agent supply device according to this invention is mounted on a carriage. It is a perspective explanatory view (the wheel is not shown) which shows the form in which the main equipment of the external foaming agent supply device according to this invention is attached to the rack of a carriage. FIG. 6 is a perspective explanatory view schematically showing an example of a piping configuration between a cooling device and a pump in the arrangement structure shown in FIG. FIG. 6 is a perspective explanatory view schematically showing an example of a piping configuration of an apparatus for a foaming agent supply flow path from a pump to a foaming machine. In the external foaming agent supply device according to the present invention, it is a schematic explanatory drawing which shows an example of the cooling device for cooling the foaming agent which is circulated in the foaming agent supply flow path, and (a) is as a cooling device. It is explanatory drawing when the chiller is used, and (b) is explanatory drawing when the Peltier element is used. FIG. 2 is a schematic explanatory view corresponding to FIG. 2, showing another different example of the external foaming agent supply device according to the present invention.

Hereinafter, in order to more specifically clarify the configuration of the external foaming agent supply device according to the present invention, a typical embodiment of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows the arrangement configuration of the equipment according to an example of the on-site spray type foaming machine to which the external foaming agent supply device according to the present invention is attached, in which foaming is performed. The machine 10 has a first supply system 12 that pumps a first liquid containing a polyol, a second supply system 14 that pumps a second liquid containing a polyisocyanate, and the first and second supply systems 12 thereof. , A known spray gun 16 such as a handheld type, which is an injection device that mixes and injects the first liquid (polyol) and the second liquid (polyisocyanate) supplied in No. 14, and the first of them. And a foaming machine control device 18 for controlling the supply amount of the first liquid and the second liquid supplied by the second supply systems 12 and 14. In the first and second supply systems 12 and 14, jacket devices for heating the flow paths of the first liquid and the second liquid supplied through the respective supply systems are not shown. However, as in the conventional case, each is provided.

There, in the first supply system 12, the first liquid flow path 12a, which serves as a liquid pumping path for guiding the first liquid at a predetermined pressure, is connected to the first tank 12b containing the first liquid containing the polyol. The first liquid in the first tank 12b is connected, and after being pumped by the first pump 12c, it is pumped by the first pump 12d, and the discharge pressure thereof is the first. It is detected by the pressure gauge 12e, further heated by the first heater 12f, and then supplied to the spray gun 16. On the other hand, in the second supply system 14, similarly, the second liquid flow path 14a, which is the liquid pumping path for guiding the second liquid at a predetermined pressure, is the second liquid containing the polyisocyanate. The second liquid connected to the tank 14b and contained therein is pumped by the second pump 14c and then pumped toward the spray gun 16 by the second pump 14d. Further, the discharge pressure of the second liquid to be pumped is detected by the second pressure gauge 14e, heated to a desired temperature by the second heater 14f, and then sprayed. It is designed to be supplied to the gun 16.

Then, in such a foaming machine 10, the first liquid containing the polyol contained in the first tank 12b passes through the first liquid flow path 12a of the first supply system 12 to the foaming machine control device 18. While being supplied to the spray gun 16 at a predetermined pressure and temperature under the control of, the polyisocyanate contained in the second tank 14b through the second liquid flow path 14a of the second supply system 14. The second liquid containing is pumped at a predetermined pressure and temperature under the control of the foaming machine control device 18 and fed to the spray gun 16, where the first liquid and the second liquid are Is mixed, and then sprayed from the spray gun 16 onto an object such as a wall at the spraying site to form a polyurethane foam layer having a predetermined thickness.

The foaming agent supply device according to the present invention is configured as an external foaming agent supply device to be attached to the on-site spray foaming machine 10 having the above-described configuration at the spray foaming site. An example of this is shown in FIG. There, the foaming agent supply device 20 includes a foaming agent tank 22 containing a foaming agent that can be vaporized at room temperature, such as carbon dioxide and HFO (hydrofluoroolefin), and a foaming agent taken out from the foaming agent tank 22 ( In order to guide the liquid) and supply it to the first or second supply system 12/14 in the foaming machine 10, it is detachably connected to the first or second liquid flow path 12a / 14a of those supply systems. A chiller 23, a foaming agent pump 26, an accumulator 28, a foaming agent pressure gauge 30, a flow control valve 32, and a check valve 34, which are arranged on the foaming agent supply flow path 24 and the foaming agent supply flow path 24, respectively. And a control device 36 for controlling the foaming agent pump 26 and the flow control valve 32.

There, the chiller 23 cools the foaming agent taken out of the foaming agent tank 22, and the foaming agent pump 26 discharges the foaming agent guided from the foaming agent tank 22 at a predetermined discharge pressure. The accumulator 28 is further connected to the foaming agent supply flow path 24 on the downstream side of the foaming agent pump 26, and foams in the foaming agent supply flow path 24. It is designed to suppress or prevent sudden changes in the pressure of the agent. Further, as the flow rate control valve 32, an electromagnetic on-off valve is used here, and by the opening / closing operation, the foaming agent is applied to the foaming machine 10 under the pressure on the upstream side of the flow rate control valve 32. It can be supplied to the first or second liquid flow rate 12a / 14a. Then, the foaming agent pressure gauge 30 is attached to the foaming agent supply flow path 24 portion between the flow control valve 32 and the foaming agent pump 26, detects the foaming agent supply pressure in the flow path portion, and detects the foaming agent supply pressure. The pressure data is input to the control device 36. The check valve 34 is provided to prevent the backflow of the first or second liquid from the connected first or second liquid flow path 12a / 14a into the foaming agent supply flow path 24. ing. Further, a raw material pressure gauge 38 that digitally detects the pressure of the first or second liquid to be pumped through the first or second liquid flow path 12a / 14a is attached as needed. , The digital signal from the raw material pressure gauge 38 is input to the control device 36.

Further, in the control device 36, the foaming agent supply pressure is based on the foaming agent supply pressure information input from the foaming agent pressure gauge 30 and the pressure information of the first or second liquid input from the raw material pressure gauge 38. A signal for controlling the opening / closing operation of the flow control valve 32 is output so that the pressure is higher than the pressure of the first or second liquid, and the pump operation of the foaming agent pump 26 is also performed. The control signal is output. That is, the control device 36 is separated from the control device 18 of the foaming machine 10 to control the flow rate control valve 32 and the foaming agent pump 26. In addition, since the chiller 23 needs to keep the inside of the foaming agent supply flow path 24 of the foaming agent supply device 20 in a liquid state in order to supply a foaming agent such as carbon dioxide in a constant amount, it will be described later. In such a configuration, the foaming agent tank 22 and the foaming agent pump 26 are provided as cooling means for cooling the foaming agent that is circulated in the foaming agent supply flow path 24. It is arranged at 24 parts of the foaming agent supply flow path between and.

Then, in the foaming agent supply device 20, at the end of the foaming agent supply flow path 24 on the check valve 34 installation side, as shown in FIG. 3, the first or second liquid flow path 12a / in the foaming machine 10 It is connected to 14a by using a three-way pipe joint, that is, cheese 40 which is a T-shaped pipe joint. Specifically, two connection ports are previously connected to the first or second liquid flow path 12a / 14a, and the remaining one connection port of the cheese 40 forming a part of the flow path is connected. On the other hand, the end portion of the foaming agent supply flow path 24 in the foaming agent supply device 20 on the downstream side of the check valve 34 arrangement portion is detachably and fluidly attached by screwing. .. Further, if necessary, the raw material pressure gauge 38 is also fluidly attached via the cheese 42, and the pressure information detected by the raw material pressure gauge 38 is input to the control device 36 by a digital signal. It has become like. In the installation of the raw material pressure gauge 38, the first or second pressure gauges 12e / 14e already arranged in the first or second liquid flow path 12a / 14a via the cheese 44 are analog. In the case of a pressure gauge, it is necessary, but in the case of a pressure gauge that can output a digital signal, the raw material is made to input the pressure signal to the control device 36. The arrangement of the pressure gauge 38 becomes unnecessary. Further, an appropriate mixer 46, for example, static is used in the flow path on the downstream side of the cheese 40 of the first or second liquid flow path 12a / 14a to which the foaming agent supply flow path 24 of the foaming agent supply device 20 is connected. The first or second liquid to which the first or second liquid flow path 12a / 14a is pumped by disposing a mixer or the like and the foaming agent supplied through the foaming agent supply flow path 24 are uniformly distributed. It is designed to be mixed. Then, by connecting the foaming agent supply device 20 to the foaming machine 10 in this way, a foaming agent externally added type on-site spray foaming system having a configuration as shown in FIG. 4 is completed. It will be.

By the way, the foaming agent supply device 20 having the above-described configuration can be easily moved to the vicinity of the foaming machine 10 used in the foaming site, and its main equipment can be easily and quickly connected. , As shown in FIG. 5, so that it can be easily moved to the target position at the foaming site by the rolling of the wheels 52 mounted on the trolley 50 and provided at the lower part of the trolley 50. It has become. That is, here, in the foaming agent supply device 20, the chiller 23, the foaming agent pump 26, the accumulator 28, the foaming agent pressure gauge 30, the flow rate control valve 32, the check valve 34, and the control device 36 are the foaming agent supply flow path 24. At the same time, it is placed on a metal rack 54 that serves as a mounting frame for the trolley 50, and is fixed and held. FIG. 6 shows the mounting state of these devices with respect to the rack 54 in the form of a perspective view (wheels 52 omitted). Here, as the foaming agent pump 26, a swash plate type axial plunger pump is used, which is composed of a pump 26a and a drive unit 26b. Further, since the foaming agent tank 22 is large in shape and heavy in weight, it is not mounted on the trolley 50, and the trolley 50 is provided with a separately prepared strong trolley or an appropriate transportation means. It is designed to be moved and fixed separately to the moving position, but if possible, the foaming agent tank 22 is also mounted and fixed on the trolley 50, and all the devices are mounted on the trolley. It can also be moved at 50. Further, as the trolley 50, if the trolley 50 has a structure in which wheels are provided on a pedestal capable of transporting and moving the foaming agent supply device 20, a flat plate shape, a shelf shape, a box shape, and a frame or a plate are provided on the pedestal. The shape of the dolly is not particularly limited.

Further, FIG. 7 schematically shows a piping connection configuration between the chiller 23 and the foaming agent pump 26 in the loading configuration of the foaming agent supply device 20 for the carriage 50. There, a foaming agent inflow hose 56 that guides the foaming agent from the foaming agent tank 22 is connected to the foaming agent inflow port 23a of the chiller 23, and the foaming agent is guided to the cooling flow path in the chiller 23, where the refrigerant is used. After being cooled by, it is supplied to the foaming agent pump 26 through the foaming agent outflow hose 58 connected to the foaming agent outlet 23b. The refrigerant in the chiller 23 is also guided into the foaming agent pump 26 through the pump cooling refrigerant delivery hose 60 to cool the inside of the foaming agent pump 26, and then passes through the pump cooling refrigerant recovery hose 62. It is designed to be returned to the chiller 23. Therefore, here, the foaming agent inflow hose 56 and the foaming agent outflow hose 58 form a part of the foaming agent supply flow path 24 together with the cooling flow path in the chiller 23.

Further, in FIG. 8, as shown in FIG. 6, the accumulator 28, the foaming agent pressure gauge 30, and the flow rate with respect to the pipeline constituting the foaming agent supply flow path 24 portion extending from the foaming agent pump 26 arranged in the rack 54. An example of the arrangement form or piping configuration of the control valve 32 and the check valve 34 is schematically shown. There, an accumulator 28 having the same structure as the conventional one is connected to the pipeline connected to the discharge port of the foaming agent pump 26 via cheese 64 to suppress or prevent pressure fluctuation in the pipeline. It has become possible. Valves 66 and 68 for controlling the operation of the accumulator 28 are provided on both sides of the accumulator 28, respectively. Further, on the pipeline connected to the cheese 64, a flow rate control valve 32 and a check valve 34 are provided together with a foaming agent pressure gauge 30 and a pressure release valve (automatic) 72 via a cross-shaped pipe joint 70. The pipeline is connected. Further, a pressure reducing valve 74 is connected on the pipeline between the cross-shaped pipe joint 70 and the cheese 64 so that the pressure of the foaming agent flowing in the pipeline can be reduced. The volume of the accumulator 28 is generally about 20 mL to 5 L, preferably 25 mL to 2 L, and more preferably 30 mL to 1 L.

As described above, in the foaming agent supply device 20 in which the main equipment is mounted on the carriage 50 and is movable, it is free depending on the arrangement position of the foaming machine 10 used at the spraying site. The foaming agent supply flow path 24 can be freely attached to and detached from the first or second liquid flow path 12a / 14a in the foaming machine 10. Therefore, the externaling work of the foaming agent to the foaming machine 10 can be easily and easily performed as needed, and the foaming agent supply device 20 is separated from the foaming machine 10. It is possible to freely move the foaming machine 10 to a position where the action of heating can be avoided, and to avoid the influence of the heat from the foaming machine 10 on the foaming agent supply flow path 24 and the like as much as possible. Therefore, problems such as waviness of the polyurethane foam formed by effectively avoiding the adverse effect of heat from the foaming machine 10 side, variation in the density distribution, and generation of cracks have been solved. It can be resolved in an advantageous manner. Thus, in addition to the winter countermeasures by the external addition of the foaming agent, the external addition system from the foaming machine 10 in which the adverse effect of heat, especially in the summer, can be effectively avoided could be advantageously realized.

By the way, since the pressure inside the foaming agent supply flow path 24 of the foaming agent supply device 20 is adjusted to be higher than the pressure inside the liquid flow paths 12a / 14a of the connecting foaming machine 10, the foaming machine When the amount of spraying by 10 is increased and the spraying work is continuously performed for a long time, the foaming agent pump 26 of the foaming agent supply device 20 alone secures sufficient pressure in the foaming agent supply flow path 24. However, here, the accumulator 28 is located on the downstream side of the foaming agent pump 26 in the foaming agent supply flow path 24 portion between the flow control valve 32 and the foaming agent tank 22. It is arranged so as to. By arranging the accumulator 28 in this way, it is possible to suppress the fluctuation of the pressure when the foaming agent pump 26 pulsates and prevent a sudden drop in the pressure in the foaming agent supply flow path 24. The supply pressure of the foaming agent can be stabilized, and the variation of the sprayed foam due to changes in the environment and working conditions can be advantageously prevented, and the volume in the pressure-controlled foaming agent supply flow path 24 can be increased. By increasing the pressure, it becomes easier to control the pressure, and it is possible to form a stable foam with no variation in the density distribution even in a long-time spraying operation.

Further, as the chiller 23 or the like which is the cooling means of the foaming agent supply flow path 24 in the foaming agent supply device 20 as described above, a known structure can be adopted, and an example thereof is shown in FIG. Has been done. Here, (a) shows an example of the cooling form of the foaming agent supply flow path 24 in the chiller 23, and the spiral flow path 24a formed in a spiral shape of the foaming agent supply flow path 24 is inside the chiller 23. The refrigerant in the chiller 23 can be cooled by the refrigerant, and the refrigerant in the chiller 23 is circulated by the refrigerant delivery hose 60 and the refrigerant recovery hose 62 for cooling the foaming agent pump 26. Further, in (b), an example of a cooling mode using a Peltier element is shown, in which a known Peltier element 76 is attached to a zigzag flow path 24b provided in the foaming agent supply flow path 24. In this Peltier element 76, the foaming agent from the foaming agent tank 22 guided to the foaming agent supply flow path 24 is cooled, and further, in another Peltier element 78, the foaming agent is cooled. The pump 26 is also designed to be cooled.

Further, in such a foaming agent supply flow path 24, the piping of the flow path portion including at least the spiral flow path 24a and the zigzag flow path 24b cooled by the chiller 23 which is a cooling means and the Peltier element 76 has thermal conductivity. It is desirable that the material is made of a material of 10 W / mK or more, for example, a heat conductive tube made of stainless steel, aluminum, copper or the like, whereby the foaming agent can be effectively cooled. In order to supply a fixed amount of the foaming agent, it is necessary to hold the foaming agent so that it can be circulated in the foaming agent supply flow path 24 in the foaming agent supply device 20 in a liquid state, and in particular, foaming. This is because it is desirable to cool the flow path from the agent tank 22 to the foaming agent pump 26 and the inside of the foaming agent pump 26.

Then, when cooling the flow path from the foaming agent tank 22 to the foaming agent pump 26, a heat conductive tube made of a material having a thermal conductivity of 10 W / mK or more is used as a flow path having a length of 500 mm or more. The heat exchange part to be formed is formed so that the heat exchange part is cooled from the outside by the chiller 23 and the Peltier element 76. In addition, in order to effectively transfer cold air to the foaming agent that is circulated in the foaming agent supply flow path 24, the heat conductive tube is made of a material of 10 W / mK or more, preferably 16 W / mK to 500 W / mK. The foaming agent supply flow is such that the heat conduction tube (heat exchange part) has a length of 500 mm or more, preferably 700 to 2000 mm, so that the foaming agent can be sufficiently cooled by cooling from the outside. At least a part of the road 24 will be configured.

Although the typical embodiments of the present invention have been described in detail above, they are merely examples, and the present invention is limited by specific descriptions relating to such embodiments. It should be understood that it is not to be interpreted as.

For example, in the exemplary embodiment, the chiller 23 cools the foaming agent supply flow path 24 portion between the foaming agent tank 22 and the foaming agent pump 26, but an appropriate number of flow paths. It is also possible to provide a cooling means such as a chiller at a location so as to avoid a temperature rise of the foaming agent flowing in the foaming agent supply flow path 24, and further, a foaming agent supply flow by an appropriate cooling means. It is also effective to cool the entire path 24 or to cover the entire flow path portion other than the location where the chiller 23 is arranged with a heat insulating material or the like to insulate from the outside.

Further, even in the flow rate control valve 32, in the embodiment, the electromagnetic on-off valve is used, and the blowing agent at a predetermined pressure is released by the opening / closing operation of the electromagnetic on-off valve in the first or second liquid flow path in the foaming machine 10. Although the flow rate control valve 32 is designed to flow into 12a / 14a, valves having various known structures can be used, for example, the size of the flow path through which the foaming agent is passed is changed. It is also possible to use a throttle valve structure that changes the flow rate of the foaming agent. In this case, the foaming agent pressure gauge 30 is provided at the foaming agent supply flow path 24 on the downstream side of the flow rate control valve 32. Then, the pressure of the foaming agent supplied to the foaming machine 10 through the foaming agent is detected.

Further, the external addition of the foaming agent by the foaming agent supply device 20 is performed on the liquid flow paths 12a / 14a of any one of the first and second supply systems 12 and 14 of the foaming machine 10, and they are also used. It is also possible to carry out for both the liquid flow paths 12a and 14a. In that case, the foaming agent supply device 20 is configured to have two foaming agent supply systems, and liquid pumping conditions in the first supply system 12 and the second supply system 14 in the foaming machine 10. Depending on the situation, two foaming agent supply flow paths 24 and 24 are provided, or a flow path on the downstream side of the flow rate control valve 32 is branched to form a first liquid flow path 12a or a second liquid flow path 14a. It is also possible to connect.

Furthermore, even in the connection structure of the foaming agent supply flow path 24 to the first or second liquid flow path 12a / 14a, the connection structure by the screwing method as illustrated is preferably adopted. In addition, any known connection structure such as a connection structure by a fitting method can be adopted as long as it is a detachable connection structure. In addition, even in the foaming agent pump 26 and the foaming agent pressure gauge 30, a known pump or detector capable of discharging a predetermined amount of the foaming agent or outputting the pressure of the foaming agent as a digital signal is appropriately selected. , Will be used.

By the way, in the exemplary embodiment, the foaming agent pump 26 is provided on the foaming agent supply flow path 24, and the foaming agent at a predetermined pressure flows on the foaming agent supply flow path 24 under the control of the control device 36. Although it is designed to be distributed, as shown in FIG. 10, the foaming agent tank 22 is heated without providing the foaming agent pump 26, and the outflow amount (pressure) of the foaming agent contained therein is used. It is also possible to provide a heater 80 capable of increasing the pressure, and control the heating by the heater 80 by the control device 36 to adjust the blowing agent delivery pressure on the foaming agent supply flow path 24. ..

Further, even in the control of the foaming agent pump 26 in the foaming agent supply device 20, the fluid supply flow path 24 is connected as clarified in JP-A-2017-29903 and JP-A-2016-78304. The pump operating state of the first or second pump 12d / 14d for pumping the first or second liquid in the first or second liquid flow path 12a / 14a of the foaming machine 10 is detected. Based on the signal, the control device 36 controls the foaming agent pump 26 so that the pressure detected by the foaming agent pressure gauge 30 is higher than the pressure detected by the raw material pressure gauge 38. It is also possible to do so.

In addition, although not listed one by one, the present invention can be implemented in embodiments with various modifications, modifications, improvements, etc., based on the knowledge of those skilled in the art, and such embodiments are: It goes without saying that all of them belong to the category of the present invention as long as they do not deviate from the gist of the present invention.

10 Foaming machine 12 First supply system 14 Second supply system 16 Spray gun 18 Foaming machine control device 20 Foaming agent supply device 22 Foaming agent tank 23 Chiller 24 Foaming agent supply flow path 26 Foaming agent pump 28 Accumulator 30 Foaming agent pressure Total 32 Flow control valve 34 Check valve 36 Control device 38 Raw material pressure gauge 40 Cheese 50 Cart 52 Wheels 54 Rack 56 Foaming agent inflow hose 58 Foaming agent outflow hose 60 Refrigerant delivery hose 62 Refrigerant recovery hose 76,78 Perche element 80 Heater

Claims (10)

A first supply system for pumping a first liquid containing a polyol, a second supply system for pumping a second liquid containing a polyisocyanate, and a first supply system supplied from the first and second supply systems, respectively. A predetermined foaming agent connected to the first supply system or the second supply system in a field spraying foaming machine having an injection device for mixing and injecting the first and second liquids. As an external foaming agent supply device that supplies
With a foaming agent supply flow path that is detachably connected to the first or second supply system and guides the foaming agent that can be vaporized at room temperature supplied from the foaming agent tank to the first or second supply system. A pressure gauge that detects the pressure of the foaming agent supplied to the first or second supply system through the foaming agent supply channel; and the first or second supply system through the foaming agent supply channel. A flow control valve that controls the flow rate of the foaming agent supplied to the foaming agent; a cooling means that is provided on the foaming agent supply flow path and cools the foaming agent that flows in the foaming agent supply flow path; The foaming agent supply pressure detected by the pressure gauge is higher than the pressure of the first or second liquid pumped in the first or second supply system connected to the supply flow path. As described above, the control device for controlling the flow control valve has at least a movable carriage, which is installed.
The trolley is moved to the location of the on-site spraying type foaming machine that requires the external addition of the foaming agent, and the foaming agent supply flow path is connected to the first or second supply system. An external foaming agent supply device, characterized in that the target foaming agent is configured to be supplied and added to the on-site spray foaming machine from the outside. A claim in which at least a part of the foaming agent supply flow path is composed of a heat conductive tube made of a material having a thermal conductivity of 10 W / mK or more, and the cooling means is arranged on the heat conductive tube. Item 2. The external foaming agent supply device according to Item 1. A pump for delivering the foaming agent guided from the foaming agent tank is provided at a portion of the foaming agent supply flow path on the upstream side of the flow control valve, and the pump operation of the pump is controlled by the control device. The external foaming agent supply device according to claim 1 or 2, wherein the foaming agent supply pressure detected by the pressure gauge is adjusted. A heater is attached to the foaming agent tank, the heating of the foaming agent tank by the heater is controlled by the control device, and the foaming agent supply pressure detected by the pressure gauge is adjusted. The external foaming agent supply device according to claim 1 or 2. An accumulator is connected to and arranged with respect to the foaming agent supply flow path so as to be located on the upstream side of the flow rate control valve, and the foaming agent guided in the foaming agent supply flow path flows into the accumulator. The external foaming agent supply device according to any one of claims 1 to 4, which is designed to be urged. Any of claims 1 to 5, wherein the foaming agent tank is transported or moved separately from the movement by the trolley, and is moved to the spray foaming site and arranged in the vicinity of the trolley. The external foaming agent supply device according to item 1. The claim that the foaming agent tank is arranged on the trolley so that the trolley can be moved at the same time together with the foaming agent supply flow path, a pressure gauge, a flow rate control valve, a cooling means, and a control device. The external foaming agent supply device according to any one of claims 1 to 5. The connection between the first or second supply system and the foaming agent supply flow path is made using a three-way pipe joint, and the two connection ports of the three-way pipe joint are the first or second supply system. While being connected to the first or second liquid pumping path and forming a part of the liquid pumping path with the three-way pipe joint, with respect to the remaining one connection port of the three-way pipe joint. The external foaming agent supply device according to any one of claims 1 to 7, wherein the foaming agent supply flow path is detachably connected. The pressure of the pressure-fed liquid is detected on the liquid pressure-feeding path that is upstream of the connection point of the foaming agent supply flow path with respect to the first or second liquid pressure-feeding path in the first or second supply system. The external foaming agent supply device according to any one of claims 1 to 8, wherein a liquid pressure detecting means for outputting the detection signal and inputting the detection signal to the control device is provided. A mixer is disposed on the liquid pressure feed path downstream of the connection point of the foaming agent supply flow path with respect to the first or second liquid pressure feed path in the first or second supply system, and the liquid is disposed of. The first or second liquid to be pumped in the pumping path and the foaming agent supplied through the foaming agent supply flow path are mixed according to any one of claims 1 to 9. The external foaming agent supply device described.

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