JPS61237610A - Manufacturing device of heat insulation box material - Google Patents

Abstract

PURPOSE:To contrive reductions of the cost of equipment and the cost of a material by facilitating and smoothing application work, by making water from a water source and one-can urethane stock solution react through operation of an operation part. CONSTITUTION:As for a needle gun 24, the same is held by grasping a main body of the same, an inner box 8 is incorporated with the same and a long-sized part 38 is inserted into a gap between an outer box 2 having an opening part for its bottom and the inner box 8 When a lever 32 is pulled against the force of a spring 62, to begin with, a valve body 60 is kept moving at the same time and when the lever 32 is pulled against force of a spring 68 further, passages 58, 59 are communicated with each other, water is blown off through discharge openings 56, 56 by turning into a thin line and atomized as the same collides with the water blown off through the other party discharge openings 56, 56 in front of a discharge opening 53. Simultaneously with the above process, as a needle bar 46 is separated from a tapered surface 49 a one-pack type urethane stock solution is blown off through the discharge opening 53 and applied to the back of a flange 15 under a state wherein the one-pack type urethane stock solution is mixed up with the atomized water. Though the polyurethane stock solution begins to expand upon expansion of monofluorotrichlormethane through a drop of pressure, the same is cured rapidly after the same has been applied as the same is reacted with water.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to an improvement in an apparatus for manufacturing heat insulating boxes for refrigerators, freezer showcases, and the like.

(b) Conventional technology Conventionally, this type of insulated box is made by filling the outer box and inner box with each composition liquid of polyol and polyisocyanate, an amine catalyst, and a blowing agent such as monofluorotrichloromethane. A liquid polyurethane foam insulation material is formed. These components are mixed in a mixer with their composition ratios strictly controlled, and then injected between the outer box and the inner box. At this time, the outer box and the inner box are usually loaded into a foaming jig with their openings facing downward, as in Japanese Patent Publication No. 58-40109, and in this state, the mixed insulating material stock solution is injected.
Monofluorotrichloromethane expands and evaporates due to heat generated by the chemical reaction between the polyol and polyisocyanate between the two boxes, causing foaming, which fills the space between the two boxes and solidifies to form a heat insulating material.

P4 Problems to be solved by the invention Before foaming, the insulating material stock solution injected between the two boxes is stored for a small amount on the back side of the opening edge joint between the outer box and the inner box, which is the bottom surface, so it leaks from this joint. There is a risk of leakage. In particular, the front corner of the top surface of the outer box is likely to have a gap with the inner box because the constituent walls of the outer box are butted against each other. For this reason, in the past, the insulation material was injected between the two boxes by single-point injection from the part far from the top of the outer box, that is, the part that would become the bottom wall of the insulation box, but in recent years, with the increase in size of refrigerators, etc. As a result, it has become difficult to achieve uniform filling with single-point injection, and as multi-point injection methods have been adopted, the injection port is moving closer to the top of the outer box, making the above-mentioned danger even more serious. .

Therefore, conventionally, as shown in the above-mentioned public notice, the method of sealing by attaching an elastic sealant to the joint between the outer box and the inner box,
Alternatively, a method of sealing the joint by applying a thermoplastic material such as hot melt material or the above-mentioned mixed heat insulating material stock solution in advance has been considered, but in the case of loading an elastic sealant, the inner surface of the outer box or inner box may be sealed. In addition, products that apply thermoplastic materials require heat melting equipment, which increases equipment costs.In addition, the work environment deteriorates due to heat generation, and energy costs and material costs increase. Soaring prices are a problem. Furthermore, in the case of using a mixed heat insulating material stock solution, a mixer for mixing, a pump for delivery, etc. are required, resulting in a rise in equipment costs.

(Means for solving the problem) In order to solve the problem, the present invention provides a heat insulating box (1
) manufacturing apparatus (c) includes an application means (goods) having an operation part and a discharge end decoy, and a dispensing end (4) that supplies water from a water source (c).
A means for transporting the one-component polyurethane stock solution containing polyisocyanate as the main component to the discharge end (40) was prepared, and water and the stock solution were made to react by operating the operating section 0. It is something.

(e) Function According to the present invention, the application work can be performed more easily and smoothly than when an elastic sealant is loaded as a sealing member of the insulation box, and the thermoplastic material or the above-mentioned mixed insulation material stock solution can be applied. Equipment costs and material costs can be reduced compared to those that do.

(F) Embodiment An embodiment in which the present invention is applied to a refrigerated HK will be described with reference to the drawings. Figure 4 shows the insulation box before foaming the insulation material (described later).
1) is shown set in a jig (not shown). (2)
is an outer box made of steel plate, for example, a top surface (3) and left and right sides (41+51) are formed by bending a single steel plate, a bottom plate (6) is attached to this, and a back plate (7) is formed. is attached to form a box body with a front opening. (8) is an inner box made of synthetic resin such as polystyrene, and in this example a large refrigerator is assumed, so it is molded in one piece. A freezer compartment part (101) and a refrigerator compartment part (Lll) are formed above and below by the partition wall part (9), which is incorporated into the outer box (2) with a distance between them.The fil (13) is connected to the inner box ( 8)
This is an injection hole formed in the back plate (7) portion corresponding to the partition wall portion (9), through which the foamed heat insulating material stock solution to be described later is injected. It is desirable to form the injection hole (13G (to) on the bottom plate (6) from a design point of view, but if the refrigerator is large, the insulation material will not be sufficiently distributed in the direction of the top plate (3). It is located at

Figure 5 shows the completed insulated box (11 outer boxes (2 + inner boxes (8)).
) Shows an enlarged cross-sectional view of the joint. A substantially U-shaped groove (141) that opens inward is bent on the front opening edge of the outer box (2), and a flange formed outward on the front opening edge of the inner box (8) is formed within this groove (141). α9 engages and inner box (8)
is built into the outer box (2). This Makigou (141
The flange a9 of the inner box (8) is in contact with the back surface of the front double flange af1, and in the deep part of the groove (141) there is installed an anti-entanglement pipe aη composed of a high-temperature refrigerant pipe included in the refrigeration cycle. are arranged. Nishiki has an outer box (2) and an inner box (8
) is a foamed heat insulating material made of polyurethane foam formed within the interval between the polyol and polyisocyanate, which is injected through the aforementioned injection hole (12) Q (end) using monofluorotrichloromethane as a foaming agent, and is foamed and solidified. It is formed by This injection hole (121Q3) is closed during the foaming process. (11 is a sealing layer applied to the surface of the gap side of the joint between the outer box (2) and the inner box (8) at the opening edge of the heat insulating box (1) before foam filling with the heat insulating material U. .Insulation material Q
After the stock solution No. 81 is injected, it remains at the edge of the opening for a while, but
Due to the presence of the seal layer σ value, the stock solution will not leak to the outside from the joint between the outer box (2) and the inner box (8).

Figure 1 shows the seal layer a! Sealing device forming J (c)
It shows. (2) is an inert gas source that releases nitrogen gas under pressure, and (21) is a tank as a source of a one-component polyurethane stock solution whose main component is prepolymerized polyisocyanate as a constituent material of the seal layer 0. It is. The raw solution in the tank αυ contains polyisocyanate, the aforementioned catalyst, and monofluorotrichloromethane, and is transferred to the transport pipe (c) via the pressure control valve (22) using pressurized nitrogen gas.
A needle gun as a coating means to which the tip is attached c! 4) is blown out. (A) is a water supply device connected to a normal water supply as a water source, and the water is sent to the transport pipe (C) via a pressure regulating valve, and the tip is discharged by a needle gun (Foundation) attached in the same way. be done.

The above gas sources, tank 01), transport pipes (c) (c),
The sealing device (c) is composed of a water supply device (c), a needle gun C241, etc.

FIG. 2 shows the external appearance of a needle gun 34) as a coating means, and FIG. 3 is a sectional view showing its structure.

(to) is the main body forming the grip C1,). A lever +321 as an operating part is attached to the main body (to) and is located in front of the grip c111, and the lever +321 is rotatable at the upper end of the rotation axis (c). They are connected at a connecting part (r35) located at the front of 02 and a connecting part (g) located at the lower end of the grip sail. The main body (7) has an elongated part extending further forward, and a nozzle cap (4G) as a discharge end is attached to the front end of the elongated part C3L.

The long part (end) is the outer tube (411) fixed to the front end of the main body (411).
42, an inner tube (44) inserted into this outer tube (42 with a gap (43) in it, and an inner tube (44J) and a gap (451) in the inner tube). A needle rod body which protrudes forward and backward and has a tapered front end is inserted.The cap C1l has a through hole (4Fj) in the center into which the needle rod (46) is inserted, and is screwed into the outer tube (end). Inner tube (
The hole contacts the entrance of the through hole, and also forms a gap with the needle bar (46), which communicates with the gap (c) in this gap, and the front part forms a tapered surface +4.
9 is formed to have a small diameter, and the tip of the needle rod (■) comes into contact with this tapered surface (41).A through hole (a passage 5D separate from 48) is further formed in the mouthpiece. , the passage 6υ communicates with the interval (43).

Nozzle cap (4G is formed through a discharge passage 52 communicating with a through hole (48) in the center, and protrusions 54 protrude forward on both sides of the five discharge ports of this passage)C5
4) is formed. Six sufficiently narrow passages communicating with the passages 151) are formed in the protrusions 54) and 54), and furthermore, the discharge ports (one not shown) are the discharge ports -
The openings are directed to the same point in front of the. On the other hand, the main body (
A passage (c) that communicates with the transport pipe (c) via a connecting portion (to) and a passage 6I that communicates with the interval (43) are formed in the passage 1511i1.!J1. A valve body of the formula is interposed.The front part of the valve body is the main body 01)
The lever C12 protrudes outward, and the flange at its tip (1 m)
1, and is constantly biased by a spring ring in the direction of pressing the flange 6υ against the lever (32).The valve body - normally keeps the passage -eiI out of communication, but grips the lever C12+. By pulling in the direction 61), the through hole 64) communicates with the passage 61''9, thereby forming a series of water transport passages from the transport pipe (c) to the discharge port (g).

In addition, a transport pipe (c) is connected to the front part between the main bodies via a connecting part (g).
A gap (a passageway communicating with 49 is formed in the needle bar) extends to the rear of the lever C321, and is located at the rear of the lever C321.
)have. A spring lock is inserted between the flange 167) and the main body (to), and the needle rod 0e is normally biased to press its tip against the tapered surface (4) of the mouthpiece OI for sealing. However, by pulling the lever 04 toward the grip (3I), the flange 1?) comes into contact with the lever C121 and pulls the needle rod (C), so the tip is separated from the taper surface, and this pressure causes the transport tube (H) to ) to the discharge port is formed. A clearance approximately equal to the moving distance of the valve body is formed between the lever O2 and the flange, and as a result, by operating the lever I3z, water and undiluted solution are discharged from the discharge port at approximately the same time. .

Next, a procedure for forming the seal layer αl will be explained. Hold the needle gun Q4 by its main body, assemble the inner box (8), and before attaching the back plate (7), insert the needle gun Q4 into the space between the outer box (2) and the inner box (8) with the opening facing downward. Insert the long part (end) as shown in Figure 1, and insert the nozzle cap (41) into the inner box (8).
) is located close to the back of flange a9. At this time, the dimension of the long part (toward) is set to be equal to or longer than the depth dimension of the outer box (2). Thereby, the body (to)
is outside the heat insulating box (1), so there is no need to insert the worker's hand deep into the space. Next, when the lever c14 is first pulled against the force of the spring sister, the valve body moves at the same time, and when it is further pulled against the force of the spring, the passage 5 mallet and the mallet are communicated, and the discharge port ( 561 (Water is blown out in thin streaks from 561. This water is discharged from the other outlet (a) 6 ())
The water blown out from the outlet collides with the outlet in front, so it is exposed. At the same time, the needle rod 06) separates from the Teba face, so liquid urethane stock solution is blown out from the discharge port 63) and mixed with the atomized water at the flange (19).
It is applied seriously. The monofluorotrichloromethane in the polyurethane stock solution discharged from the discharge port 1531 expands due to the drop in pressure and begins to foam immediately, but the polyurethane stock solution exits from the discharge port 66) (!86).
It solidifies rapidly after being applied by reacting with water from the surface. Thereafter, a lever (33) is operated as appropriate to discharge the stock solution and water and spray the polyisocyanate all around the opening edge to form a sealing layer aj!.

At this time, since the discharge port 53) of the needle gun C24) is always pressurized, air will not enter the gap (45) and the polyisocyanate will not solidify inside. In addition, the solidification speed of polyurethane stock solution is affected by the moisture content, so if you simply discharge the stock solution into the air and it reacts with the moisture in the air, the solidification speed will be constant even when the humidity differs, such as in summer and winter. Do I have to change the amount of internal catalyst each time to achieve this?
According to the present invention, since the amount of moisture in front of the nozzle cap is always high and constant, a substantially constant reaction rate can be obtained without being affected by the amount of moisture in the air, and mass productivity is enhanced. Furthermore, in a product that solidifies simply by reacting with moisture (humidity) in the air, if the thickness of the zero-valent sealing layer is too thick, the inside cannot come into contact with the air, causing the inconvenience that only the inside does not solidify. Since the polyisocyanate is mixed with water from the discharge port 56) (56), the polyisocyanate does not solidify, and there is no restriction on the thickness of the sealing layer (1!ffi).
Coating work becomes easier. Furthermore, according to the present invention, discharge control is simpler than in systems that use steam to solidify polyisocyanate, and no equipment for producing steam is required at all.

(G) Effects of the Invention According to the manufacturing apparatus of the present invention, it is possible to seal a heat-insulating box by foaming and solidifying a one-component polyurethane containing polyisocyanate as a main component, so it can be used in products equipped with an elastic sealant. In comparison, the workability of forming the seal layer is significantly improved, and it requires less heat melting equipment and more than when applying a two-component polyurethane foam insulation material that mixes thermoplastic materials such as hot melt materials or polyol and polyisocyanate. Equipment such as mixers and pumps is not required, which reduces equipment costs and does not cause deterioration of the working environment.

Furthermore, since water is also discharged together with the polyurethane stock solution, a constant reaction rate can be obtained, and the work can proceed smoothly, and there are fewer restrictions on the thickness of the sealing layer, making the work considerably easier.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention. Figure 1 is a diagram explaining the case of applying one-component polyurethane, Figure 2 is a perspective view of a needle gun, Figure 3 is a cross-sectional view of the same, and Figure 4 The figure shows a state where the heat insulating box is mounted on a jig before being filled with heat insulating material, and FIG. 5 is a sectional view of the opening of the heat insulating box. (1)...insulation box, a9...seal layer, C
a11...tank, (c) 弼...transport pipe, c!
4)...Needle gun, (25)...Sealing device,
(2e...water supply device, (43(a...interval).

Claims (1)

[Claims] 1. An application means having an operation part and a discharge end, a water source, a source of a one-component polyurethane stock solution containing polyisocyanate as a main component, a means for transporting water from the water source to the discharge end, and the stock solution. and a means for transporting the discharge end to the discharge end,
An apparatus for producing a heat insulating box body, which causes the water and the stock solution to react outside the discharge end by operating the operation section.