RU2218766C2 - Vacuum injector - Google Patents

Abstract

FIELD: meat industry, in particular, vacuum transportation of farce and like materials. SUBSTANCE: injector has squeezing out device with two paired screws arranged for periodic rotation, vacuumizing system, and control system. Vacuum system has first valve positioned forward of vacuum pump, and gas pipeline equipped with second valve. Injector control system provides for opening of first valve and closing of second valve during rotation of screws and, vice versa, closing of first valve and opening of second valve upon stopping of screws. EFFECT: increased efficiency, reduced probability of vacuum system locking and reduced amount of residual air in farce. 5 dwg

Description

 The invention relates to the meat industry, more specifically to vacuum syringes for transporting and evacuating minced meat and other similar materials.

 The closest in technical essence is a vacuum syringe [1] for the transportation and evacuation of minced meat, which includes a displacer with a fixed body, the internal cavity of which in cross section has the shape of a lying figure eight and which has an inlet for stuffing minced meat and an outlet for minced meat. In each part of the internal cavity of the housing, corresponding to the half of the lying figure eight, two twin screws are located with precise tolerance, turning into engagement with each other. The turns of screws in the internal cavity of the housing form separate chambers, which, when the screws rotate, move to the outlet of the housing. Each screw is divided into two parts having a different value of the pitch of the turns, - injection, with a large step, directed towards the outlet of the housing, and a jack located on the opposite side of the screw. The inlet is located at the beginning of the discharge part of the screws bordering the baffle part. A vacuum is created in the internal cavity of the displacer housing by a vacuum system, due to which the stuffing is pulled into the chambers formed by turns of screws, and by rotation of the paired screws it moves to the outlet of the housing.

 Upon receipt of sausage stuffing, it is impossible to avoid air inclusions, which reduces the quality of products manufactured using a syringe, for example sausages. With the help of a vacuum system, air is sucked out of the minced meat. Evacuation of the internal cavity of the displacer body and the extraction of air from the forcemeat are possible due to the insignificant clearance between the screws and the displacer body through which air can pass, as well as the rotation of the screws moving the forcemeat from the rarefaction area and, thus, preventing the blockage of this gap. However, during short breaks when the forcemeat is fed by the syringe and, therefore, the screws stop, which is necessary during the production process with the syringe of most products, this mode is violated. Some small particles of minced meat at this moment penetrate the vacuum system, which can lead to blockage or stop the syringe for cleaning. This situation is further aggravated by the fact that the vacuum pump, which continues to operate, increases the vacuum in the internal cavity of the displacer body.

 The aim of the invention is the creation of a vacuum syringe for transportation and evacuation of minced meat, which will reduce the likelihood of clogging of the vacuum system, reduce the residual amount of air in the meat, increase the uptime of the syringe and its cost-effectiveness.

 As well as the prototype, the claimed device includes a displacer with two paired screws located in the inner cavity of the fixed housing with the possibility of periodic rotation, a vacuum system and a control system.

 The following features are added to the above-mentioned features of the device: to block the suction of air by a vacuum pump from the internal cavity of the housing in the vacuum system, a first valve is installed in front of the vacuum pump, and to supply gas to the internal cavity of the housing in the vacuum system, a gas pipeline with a second valve is installed, while the syringe control system provides opening the first and closing the second valves when rotating the screws and, conversely, closing the first and opening the second valves when the screws stop.

 Thus, it becomes possible to quickly eliminate rarefaction in the internal cavity of the housing in the baffle part of the screws during their stop, which prevents the vacuum system from sucking particles of minced meat into it. An additional advantage is that during the idle time of the screws, the vacuum pump has the ability to accumulate additional vacuum in the receiver, which then allows you to quickly create a vacuum in the inner cavity of the housing in the baffle part of the screws when they resume rotation, and also allows you to turn off the pump in order to save energy.

 The following is a description of a device made in accordance with the claimed invention.

 Figure 1 shows a General view of the device.

 Figure 2 shows the housing of the displacer.

 Figure 3 shows the displacer.

 In FIG. 4 shows a part of the device containing the propellant — a vertical section is shown passing through the axis of one of the propellant screws, as well as a vacuum system and a gas pipeline.

 Figure 5 shows two graphs illustrating the correspondence of the stop-rotation mode of the screws - the upper graph, the differential pressure in the internal cavity of the housing - the lower graph. Moreover, t is time; it coincides in both graphs; W is the angular velocity of rotation of the screws; P is the pressure in the internal cavity of the displacer body in the baffle part of the screws.

 The vacuum syringe includes a housing 1; hopper 2; displacer housing 3 with an internal cavity 4, an inlet 5, an outlet 6, a hole 7 for connecting a vacuum system 8; displacer 9 consists of two paired screws 10 having a discharge 11 and a breaker 12 part. The vacuum system 8 comprises a vacuum pump 13, a receiver 14, a first valve 15, a gas pipe 16 with a second valve 17. Between the turns of the screws 10, chambers 18 are formed between the turns of the screws 10.

 The syringe works as follows. Stuffing arrives at the inlet 5 of the displacer 3 housing (Fig.2). The vacuum system 8 in the internal cavity 4 of the housing of the displacer 3 in the baffle part 12 of the screws 10 creates a vacuum, due to which the stuffing is pulled into the chambers 18 and moved by rotating the screws 10 in the direction of the outlet 6 (figure 4). Due to the multidirectional forces acting on the stuffing created by the turns of the rotating screws 10 and the vacuum created by the evacuation system 8, as well as the exact fit of the screws 10 in the internal cavity 4 of the displacer 3, the air contained in the meat penetrates through the gaps between the turns of the screws 10, as well as between the external the surface of the screws 10 and the inner surface of the housing of the displacer 3, after which it enters the vacuum system 8. At the moment the screws 10 stop, the first valve 15 blocks the pumping of air from the internal cavity 4 to displacer 3, and the existing vacuum is partially or completely eliminated by supplying gas through the second valve 17. At the same time, the vacuum pump 13 increases the vacuum in the receiver 14. Before resuming the rotation of the screws 10, the second valve 17 shuts off the gas supply, opens the first valve 15 and, thanks to the receiver 14 quickly re-creates a vacuum in the inner cavity 4, after which the process is repeated. During operation of the device, the moment of creating a working vacuum in the inner cavity 4 is slightly ahead of the moment of the start of rotation of the screws 10, and the elimination of the working vacuum occurs after the screws 10 are stopped (Fig. 5). The coordination of the screws 10 and the vacuum system 8 is carried out by the control system.

 Thus, two complementary processes - the forcemeat movement, carried out by rotating the screws, and the creation of vacuum in the internal cavity of the body, carried out by a vacuum system, occur pulse and synchronously, which will significantly reduce the likelihood of clogging of the vacuum system, improve the cleaning of meat from air inclusions, increase time the smooth operation of the syringe and its cost-effectiveness.

Sources of information
1. The patent of Germany 2119604, A 22 C 11/08 from 02/27/75 - prototype.

Claims (1)

A vacuum syringe comprising a displacer with two twin screws located in the inner cavity of the stationary housing with the possibility of periodic rotation, a vacuum system and a control system, characterized in that for shutting off the suction of air by the vacuum pump from the inner cavity of the housing in the vacuum system, the first valve is installed in front of the vacuum pump and to supply gas to the internal cavity of the housing in the evacuation system, a gas pipeline with a second valve is installed, while the control system Ritsa provides the opening of the first and closing of the second valves during rotation of the screws and, conversely, the closing of the first and opening of the second valves when the screws stop.

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