Union for fluid carrying systems

The subject of the invention is a vacuum dispenser system for a vacuum dispensing system, especially suitable for use with cans for hazardous chemicals or the like.

From EP-O-477477 a vacuum dispenser system is known in which it is connected to the valve assembly by means of a clamping flange slidably mounted around the body and provided with four clamping eyes. During operation, the system is first inserted into the metering valve, the valves are opened and the mounting flange is turned to lock the valve in this position. This design is clearly dangerous because it is possible for hazardous chemicals to escape from the unprotected system.

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U.S. Patent No. 4,978,036 discloses a liquid container dispenser comprising a chamber with flexible walls that compresses and expands in response to movements of the nozzle assembly. The first fluid channel connects the container to the chamber, and the second, the fluid channel iTorlr ^ d iM * No. Imytnro m rdpwniViar ». with ^ pao immlzi + ê- ^ d

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Lt - valves are placed to control the flow of fluid from the container to the chamber and from the chamber to the outside, due to which the effect of fluid in the desired amount is obtained.

A system for holding liquid chemicals is known from US Patent No. 5,031,801. The system includes a fluid storage container connected to the dispenser by a connector. The connecting latch has a lever rotatably connected to the connector. The latch is equipped with a closing flap rotatably connected to the lever such that the recess of the lever allows the flap to move between the closed and open positions. The latch is also provided with a pivot mechanism for biasing the lever to a position in which it holds the closing flap in the closed position.

From the patent application DE 2 326 081 a solution of the dispenser system connected to the fluid reservoir and containing a fluid chamber located in the housing is known. The chamber is connected to the discharge line and via a valve assembly with a transit line. The valve assembly lets a stream of fluid when there is less pressure in the discharge line than the pressure in the tank, while it does not let a flow of fluid if there is no set pressure difference.

The object of the present invention is to provide a vacuum dispenser system for vacuum fluid dispensing in which the dispensing assembly cannot be opened without a tight connection between the coupling head and the dispensing assembly.

A vacuum dispenser system comprising a dispensing assembly for attachment to a liquid container and a coupling head cooperating with a dispenser assembly comprising an air valve controlling the air inlet to the tank and a fluid valve controlling the liquid outlet * from the tank, the dispensing assembly and the coupling head having a coupling assembly by their movement relative to each other, according to the invention is characterized by that the fluid valve of the dispenser assembly includes a rotatable valve member and the coupling head includes a front shaped portion connecting and rotating the valve member to an open position of the fluid valve, and the assembly connecting the dispensing assembly to the coupling head is a rotary connecting assembly.

Preferably, the valve element is in the shape of an inverted bowl having radial outlets in the side walls of the bowl, and the dispensing assembly includes a valve support element on which the valve element is rotatably mounted about a vertical axis, and the support element includes pro-outlet outlets communicating with the hole in the valve support element and the fluid valve opening position corresponding to the radial outlets of the dispensing assembly.

Preferably, the rotatable valve member has a cross recess in the upper surface and the coupling head is terminated with a central cross-shaped projection.

Preferably the coupling head comprises a through hole in which a unidirectional fluid check valve is disposed and the cross projection is surrounded by axial outlet openings connected to the unidirectional check valve.

Preferably the dispensing assembly and coupling head comprise a partially rotatable connecting assembly. '

Preferably, the connecting assembly is bayonet connections.

Preferably, an inlet air valve being a one-way valve is arranged coaxially with the fluid valve.

Preferably, the one-way valve is an annular diaphragm of the air valve disposed around the fluid valve and pressed down to seal the inlet air openings in the dispensing assembly.

The object of the invention in an embodiment is illustrated in the drawing, in which Fig. 1 shows the vacuum dispenser system with separated coupling head and dispensing assembly in longitudinal section, Fig. 2 - the vacuum dispenser system with the coupling head and dispensing assembly connected together in Fig. 1 .

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The vacuum dispenser system shown in Figures 1 and 2 consists of a dispensing assembly 70 and a coupling head 112. The dispensing assembly 70 is a plastic cast, of a typical shape, and can also be an adapted lid and includes a vertically threaded side surface 74, top 76 and a seal 78 for sealing against the edge of the can neck (not shown, e.g. a plastic can) A truncated conical socket 80 is tightly and coaxially inserted in the top of assembly 70, The top of the socket 80 is provided with a radially outwardly extending flange 82, which is attached to the top of the assembly 70. The socket 80 is also provided with a central recess 84 and a hole 86 extending from the bottom of the recess 84 to the inner end 88 of the socket body 80. Lower part of the hole 86 has a diameter larger than the upper part, and in the lower opening 86 a tube 90 is mounted extending to the bottom of the can. The seat channel 80 is sealed with a fluid valve 92 with a rotatable valve element 94. The valve element 94 has the shape of an inverted cup, with radial outlets 96 (Fig. 2) in the side walls of the cup 98, and is rotatably mounted about a vertical axis on the valve support element 100, forming part of the seat body 80, which is provided with outlet openings 102 (Figure 1) having a connection with a through hole 86.

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The valve element 94 can be rotated so that its radial outlets 96 coincide with the outlet openings 102 of the support element 100, i.e. to open the fluid valve (Fig. 2). The valve closes when the valve seal is turned from the inlet overlapping position (Fig. 1). The valve member 98 is also provided with a cross recess 104 on its upper surface.

The hole 86 in the bottom of the cavity 84 is surrounded by a ring of air holes 106 running parallel to the axis of the cavity 84 and escaping under the flange 82 of the seat 80. The resilient annular tire of the air valve 108 is embedded in a circumferential groove 110 around the outer surface of the seat body 80 and is pressed down of flange 82 of socket 80, normally closing air openings 106. The recess 84 of the seat 80 is also provided with a pair of short circumferential outward radially inward radial flanges 109.

The coupling head 112 is a cylindrical plastic-injection-molded cylindrical element whose front part 114 is provided with short, extending radially outwards, coupling flanges 116 intended for bayonet coupling with inwardly directed radial flanges 109 in central recess 84 of dispensing assembly 70. The radial flanges 109 and the coupling flanges 116 form a connecting assembly by rotating the bayonet connection of the dispensing assembly 70 with the coupling head 112. The coupling head 112 is provided with a through hole 118 which ends in a larger diameter hole. A spring-loaded ball check valve 120 is installed in a larger diameter hole. The coupling head 112 terminates in a central cross projection 122, the axial outlets 124 arranged around the ball having a check valve 120. Between the ball check valve body 120 and the front portion 114 of the coupling head 112 there is a sealing ring 126 at the front end of the coupling head 112 radially outside the outlet openings 124. The upper end 128 of coupling head 112 is threaded to allow connection to a waste pipe, not shown.

In operation, the coupling head 112 is connected to the dispensing assembly 70 by inserting the front portion 114 of the coupling head 112 into the recess 84 of the seat 80 of the assembly 70 and rotating the coupling head 112 by a portion of rotation relative to the dispensing assembly 70, so that the coupling flanges 116 of the coupling head 112 engage radial flanges 109 of seat 80 of the dispensing assembly 70. After the coupling head 112 enters the seat 80 of the dispensing assembly 70, the cross projection 122 of the coupling head enters the cross recess 104 of the check valve ball element 120, and when the coupling head 112 rotates, the valve member 94 rotates from the closed position to the open position. The sealing ring 126 is pressed against the bottom of the cavity 84 of the seat 80 radially between the air holes 106 and the rotary valve member 94 sealing the front side of the coupling head 112 in the seat 80 of the dispensing assembly 70. A suction pump (not shown) is

13129 connected to the upper end 128 of the coupling head so that it is now possible to pump the liquid L out of the can, which passes upwardly through the tube 90, through the outlet openings 102 and outlets 96 of the fluid valve, through the axial outlet openings 124 to the front portion 114 of the coupling head 112 , through a ball check valve 120 to the outlet of the coupling head 112 (as shown by the arrows in Figure 2). When the pressure drops, O2 air passes through the front portion 114 of the coupling head 112, between the flanges 116 of the coupling head 112, flowing through the air holes 106 to the upper space of the can, the pressure difference deflecting the valve diaphragm 108 down from the bottom surface of the seat flange 80 (also shown arrows in fig. 2).

The side surface 74 of the assembly 70 may be provided with a sealing ring 130 of known type and the recess 84 of the seat 80 of the assembly 70 may be provided with a transition plug (not shown).

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UP Department of Publications. Circulation of 90 copies

Price PLN 2.00