DE1673467A1 - Device for controlling temperatures - Google Patents

Description

Device for controlling rtoa temperatures.

The invention relates to a device for controlling temperatures and is particularly directed to a flow etittolkroial in which the a controlled temperature fluid by one disposed in the circuit Working chamber is pumped, whereby the temperature of the working chamber within a predetermined range is to be maintained.

The working chamber can advantageously be used as a pre # form, molding tool, Pre # plate or dg. be designed, which are heated to a ventimmed temperature value to be used for the deformation or sonatigen shaping of plastics or similar materials is suitable.

The temperature control of fluid flow through a circuit has so far been arranged by suitable adjustment of L inside the circuit Heating devices and boiling facilities connected to them causes.

Ea was also prepared ready, the fluid durob one to cool the water-cooled heat exchanger.

The flow medium located within the circuit, however, is used often kept at a temperature well above the evaporation point of water lient, d. H. a flow center temperature of about 300 ° C is common required to keep the plastic material in a flowable or workable state to keep.

If water is used to cool the heat exchanger, This way disses evaporates quickly, which can be extremely dangerous if the Küblsystem blocked as an explosion or kickback may occur.

In the previous temperature control systems with a "with # en" fluid, the pump must circulate the fluid through the Circuit and the working chamber or chambers have maximum temperature seals, to close the cycle properly. such high-temperature pumps are rleen the required diohting against high temperatures is relatively expensive. lenn aederersetta relatively inexpensive low temperature fluid seals used, the pump must often be dismantled and the seals replaced or, if a liquid is used as the fluid, must Drip plates or the like are vorgeaeban below the pump, both of which are undesirable and is disadvantageous.

In contrast, the present invention is based on the object to create a temperature control system with a fluid circulation system whose Fluid temperature held in a predetermined range can be, with this system safe and reliable and during operation the manufacturing costs should be relatively low.

Furthermore, according to the invention, a temperature control system is intended be provided for a fluid circuit which has heating devices and a fluid pump that circulates the hot fluid pumps, whereby the construction of the pump and its arrangement in the system are not relatively expensive Make high temperature seals necessary to ensure safe operation.

According to the invention, a device is provided in which an erater Ütromungjmittelkreislauf with a heating device and a first fluid pump to promote the heated fluid through the Kresßlauf and through a first working chamber or chambers, a second fluid circuit with a Second fluid pump and a temperature-controlled valve are provided are connected to both the first and the second circuit and is so connected that it is based on the temperature of the fluid in the first circuit responds, whereby when the temperature rises to a predetermined Maximum value the valve comes into operation, so that # the flow means of the second Circuit is mixed with that of the eraten circuit, thereby increasing the fluid temperature to stay within a predetermined range in the first circuit, and dtlß connect the first pump and the second pump to one another in such a way that leakage losses the first pump tuber the. zest panps don the second fluid circuit can enter.

The working chamber can advantageously be in the form of a pre # form, a Forming tool, a Pre # plate or the like. Formed and several such Arbeitskazmem tdnnon in the first circuit en'merder in parallel or in series with the be arranged first pump.

The truck of the flow means in the second circuit can advantageously be kept slightly higher than that in the first circuit, reducing the leakage losses from the craton pump, which enter the second circuit through the second pump can be kept relatively low. A slightly increased pressure of the fluid within the second circuit can by an auxiliary pump within the second Circulation can be ensured or by dressing the outlet of the second Pump, so that a higher pressure is guaranteed in the second pump than in the first pump.

The erate and albite fluid pump can be used as a gear pump be designed and nind preferably provided in a common housing, so that both pumps are driven by a common shaft. The wave can be in bearings within the housing and only as the $ site of the wethea pump be led out of the housing for connection to a drive motor, whereby it is ensured that # only an inexpensive "cold" seal between the drive shaft and the Gehtius part of the second pump needs to be provided. If both the first and second pumps are driven by a common shaft will and are arranged in a common GetSuse, the Fluid pressure in the second circuit slightly higher than that in the first circuit by suitable construction and / or closer manufacturing tolerances in the case of the second Pump. be held opposite the first pump.

In the drawing, an embodiment of the invention is shown, which is explained on the basis of the following description g nager. They show: Fig. 1 a control system for the temperature of a liquid, FIG. 2 an erate and a second liquid pump for a system according to FIG. 1 and a cross section according to line II-II in Big, 3 and Fig. g. 3 a not a combined pump according to Fig. 2.

In Fig. 1 an arrangement for controlling temperatures is shown, which seigt a first liquid circuit, which is generally designated by A, and in which an orate pump 1 wher a line 2 is connected to a heating chamber 3 is. The heating chamber 3 has an electrical heating element 4. The one connected in series Pump 1 and the heating chamber 3 are connected via lines 5 and 6 in parallel to a pair of working chambers 7 and 8 connected. Each working chamber 7 and 8 is in the present embodiment a pre # tool half with lines arranged in it, through which the liquid of the first cycle can flow. Both Working chambers 7 and 8 are via a flexible line 9 and a throttle or valve 10 to the Line 5 is connected and connected via a flexible line 11 and a casing or a valve 12 on line 6.

The line 5 connects via a line 13 to a liquid reservoir 14 connected The storage tank 14 is provided with a water-cooled heat exchanger, which has a water inlet 16 and a return 17. The water inlet 16 has a pressure-controlled switch 18, which controls with the electrical Heating element 4 is connected so that # this is used to heat the liquid inside the chamber 3 can only be put into operation for 90 long, like water through the Heat exchanger 15 flows and the water pressure actuates switch 18.

A branch line 19 extends from the line 6 and is provided with a pressure-controlled check valve 19a that controls the liquid pressure in the first circuit A is reduced when the pressure in this circuit is a predetermined one Exceeds maximum value. The newspaper 19 leads to the memory 14.

The line 2 is provided with a pressure measuring device 20 and each of the A thermometer 21 has a thermometer 21 on both lines 9 also has a second fluid circuit, generally designated by B. and is provided with a second pump 22 which is arranged in a line 23 is the between the memory 14 and a control valve 24 is provided is.

The control valve 24 consists of a pressure by the liquid Controlled two-way piston valve with piston faces of different sizes in the area of the control connections R and W. The control slide 24 has an inlet opening X, to which the line 23 is connected, the liquid flow through the slide is passed through the piston to two outlet openings Y and Z.

The outlet opening Y breathes via a line 25 to the memory 14 in connection. The outlet opening Z is connected to the line via a line 26 5 of the first circuit a A in connection. The face of the piston within the Valve 24, which is adjacent to the control opening R, is a relatively larger one Cross-section on as the face of the piston, which the Steuer5 ££ voltage W is adjacent iste The piston valve is arranged in such a way that when the piston moves in Direction from R to W the fluid between g between X and Z is established.

Line 23 is between pump 22 and the control valve 24 branched off a line 27, which is controlled by an electromagnet Valve 28 is in communication with the control opening R of the control valve 24. the Control opening W is via a line 27 'with the line 23 at one point in Connection which lies between the connection of the branch line 27 and the valve 24.

The valve 28 has three openings A ', B', C ', of which the opening A 'with the line 23, the opening B' via a line 29 with the memory 14 and the opening 04 is connected to the control opening 3. The valve 28 is so arranged that # - when the magnet is energized - the opening B 'is closed and the port A 'communicates with t of the port C' and, if the electromagnet Electromagnet not energized opening A 'is closed and opening C'mit the opening B 'is in communication.

The control valve 24 is provided with a discharge line 30 for from Seal leaking liquid provided with the memory 14 in connection stands.

In line 5 of the eraten circuit A is between the lines 26 and 9 a thermometer regulator 31 provided. see. This whist one not shown Indicator arm on whose movement changes in temperature of the liquid within the line 5 is dependent, and there are two adjustable arms, not shown provided, which are brought into positions in the movement path of the indicator arm can maintain the predetermined temperatures of the liquid within the conduit 5 specify. The thermometer controller 31 is generally known in the art as Two-contact maximum-minimum thermometer known and the adjustable arms can can be preset to a temperature difference that corresponds to the desired temperature difference corresponds to that the liquid is to be retained in the first circuit.

One of the adjustable arms is set to the lowest temperature of the liquid set in the first circuit A and forms part of a electrical circuit that includes the heating element 4, so that when the indicator arm the lowest or a higher temperature determines the heating element 4 is automatically taken out of service. The other adjustable arm will set to the highest temperature of the liquid within the first circuit A. and forms part of an electrical circuit that controls the solenoid of the valve 28 in the second circuit B, so that # when the Anzoigerarm the highest or indicates a higher temperature, the electromagnet is activated will.

The pumps 1 and 22 are arranged within a common housing, which is indicated generally at 32, and are driven by an electric motor 32 '.

The structure of the liquid pumps 1 and 22 'is shown below with reference to 2 and 3 described in more detail. The pump 1 has a first gear chamber 33 Out of which is formed inside a first housing section 34, a bracing plate 35 and a partition wall 36. The pump 22 has a second gear chamber 37 which is formed within a second housing portion 38 and on the other Side of the partition 36 is located opposite the first housing section 34, and an end plate 39. The end plate 39, the partition wall 36, the end plate 35 and the housing abutment 34 and 38 are held together by four threaded bolts 40. As can be seen from Fig. 3, en @ speaks the cross section of the two chambers 33 and 37 essentially an "8". The chamber 33 encloses two intermeshing Gears 41 and 42 and the chamber 37 in the same Asile two meshing with each other Gears 43 and 44. The gears 4t and. 43 are at 45 on a common drive shaft 46 connected, which is guided through the end plate 39 and the partition 36 and is slidably guided in a bearing bush 37 in the partition 36. the drive shaft 46 is also rotatably mounted in a socket 48 in the end plate 39 and in this is sealed by a gland packing 49, which is secured by a drill 50 which is fixed to the plate 39 by screws 51. The free end of the drive shaft 46 protrudes from the housing 32 and is connected to an electric motor 32 ′. The gears 42 and 44 aind rotatably mounted on a common Jelle 52, the between the locking plate 35 and the face plate. 39 arranged and in the separ. Nandplatte 36 is mounted The chamber 33 has an inlet opening 53 and a Outlet opening 54 (FIG. 3). In the same jeiae, the chamber 37 has not shown Entry and exit openings. The contact surfaces between the housing sections 34 and 38 and the plates 35, 36 and 39 are provided with seals, not shown.

During the operation of the pumps and 22, the shaft 46 is rotated and transmitted the rotary motion on the gears, removing the liquid from the inlet port is pumped to the outlet opening in the two chambers 33 and 37. It is straightforward it can be seen that no complex seal is provided between the chambers 33 and 37 is. Nevertheless, the liquid can only escape from the chamber 33 into the chamber 37 through the openings and bearings in the partition 36 £ tr the shafts 46 and 52 are provided.

If pump 1 is used to circulate hot liquid, can out. The liquid escaping from the chamber 33 can only get into the chamber 37 and Using the pump 22 to circulate relatively cold liquids ensures that since # only relatively inexpensive cold seals 49 are required, since the temperature the Liquid that comes into contact with the seals 49 is not sufficient for a bring about unwanted destruction of the seals. lui wheels when building the pump 1 it can be ensured that # the fluid pressure within the chamber 37 is relatively higher than the liquid pressure within the chamber 33, whereby the possibility of leakage of the hot liquid from the chamber 33 into the Chamber 37 reduced if not completely excluded. s: '.' '. v'a.'K. i. ; c? 1! 'I I-; 7s: ': a. :. ; ; is .. "'- °° x' '. r' ': ga: 2': GtC '. T' '' s'3. ' !. 'Y3'. Eg?. 'm't3T' Control of the temperature based on the heating of Pre # werk @@ ughälften 7 and 8 described by means of oil at a temperature of about 300 ° C. The adjustable Arms of the thermometer regulator 31 are at a maximum and minimum oil temperature set within the first circuit A, for example to 300 ° C and 310 ° C. The memory 14 and the liquid circuits A and B are with oil filled and the water cooler 15 is put into operation, whereby the pressure switch 18 is actuated, which allows the heating element 4 to be fed.

The operation of pumps 1 and 22 removes the oil from the reservoir 14 is continuously pumped through the lines 23 and 25 of the second oil circuit B. At the same time, 01 is from the memory 14 through the lines 13 5 and 2 sur chamber 3 pumped vwhere it is heated. The ul then enters through lines 6 and 11 in the Preßperkzeughälften 7 and 3 a. The oil in the first circuit A then becomes through lines 9 and. 5 returned to pump 1.

When the temperature of the oil in the line 5 is the predetermined lowest When the value is reached, the thermometer controller 31 triggers the switching off of the heating element 4 the end. Should the oil temperature in line 5 fall below the minimum temperature decrease, the heating element 4 is automatically switched on, making di thermostatic The lowest oil temperature should be regulated, however, should the pre # tool halves 7 and 8 received heat from an external source, whereby the oil in the first Circuit A, beyond which weber is heated, could be the pointer of the thermometer regulator 31 may reach the highest oil temperature.

As soon as the uppermost oil temperature is reached, the electromagnet is activated of the valve 28 is automatically energized and lets the oil through the branch line 27 of the second circuit B flow, whereby the piston slide 24 is brought into a position in which the oil from line 23 through line 26 into the first oil circuit A is routed to line 5. Since no shaving device is provided in the second oil circuit B data then enters the eraten cycle A, relatively counted down and cools that in located 01 from.

Since the first oil run is completely filled with oil, it becomes a part this oil when entering the relatively cold valley through line 13 in the memory 14 returned.

Since the oil temperature in the first circuit A is below the maximum While the mixture of cold and warm oil decreases, the electro magnet becomes of the valve 28 switched off, whereby the openings C 'and B' in connection with each other come. The oil pressure on the piston end in the 3erelch of the control connection W now pushes the piston axially so far away (whereby the oil, which with the external ambient air is in communication, pressed through the lines 27 and 29 into the memory 14 becomes) until the oil flow takes place between X and Y.

The erate and the second oil circuit are thus in one Position in which the n in the first circuit A neither warms nor cools will. However, if the oil temperature in line 5 is below the lowest oil temperature value drops, the heating element 4 is switched on again automatically.

By appropriately setting the check valves 10 and 12, it is possible to obtain slightly varying temperatures in the mold halves 7 and 8.

It can be seen without further that when using the invention Device for controlling temperatures it is ensured that # the oil inside of the memory 14 never exceeds a value of, for example 95 ° C, see below # consequently the oil inside the reservoir can be felt with certainty by means of water can. By combining the pumps t and 22 in the manner described, it is still possible to use relatively inexpensive pumps for the hot oil circuit, as any oil leakage outside the pump enters the relatively cold oil circuit and the only required seal on the cold pump far from the warm pump is required, and such a seal is known per se is relatively inexpensive.

Expectations:

Claims (3)

P a t e n t a asprac h e: 1. Device for controlling temperatures, characterized in that # a first fluid circuit with a heating device and a first fluid pump (1) for conveying the heated fluid through the circuit and through a first working chamber or chambers, a second Fluid medium circuit (B) with a second fluid medium pump (22) and a temperature-dependent controlled valve are provided, the aowohl with the oraten as is also connected to the second circuit and) is connected in such a way that that as responds to the temperature of the fluid in the first circuit (A), whereby when the temperature rises to a predetermined maximum value, the valve comes into operation so that # the fluid of the second circuit (B) with the first circuit (A) is mixed, thereby the flow average temperature in the first circuit within a predetermined range, and that the first pump (1 j and the second pump (22) are connected to each other so that leakage losses of the first Pump (1) enter the second solvent circuit via the second pump (22) can. 2. Apparatus according to claim 1, characterized in that # a fluid reservoir (14) provided a cooling system (15) with both the first and the second Circulation is related. 3. Device according to Claim and 2, characterized in that # the memory (14) an element of the second Fluid circuit forms. 4. Apparatus according to claim 1 to 3, characterized in that # a control element for the cooling device with a control element for the heating device is interconnected in the first circuit (A) and the control element of the heating device so influenced that this can only be put into action when the cooling device is in process. saw a @ da # in the second Stronunga medium circuit the second fluid circuit the B) a valve is arranged so that # it in the rest position of the s fluid through the second circuit and in the Operational position passes from the second circuit to the 6th first circuit. 6. Apparatus according to claim 1 to 5, characterized in that # the valve is designed as a piston slide (24), the piston with different Front cross-sections is provided, of which the one having the smaller cross-section Piston end constantly with the pressurized fluid of one of the two circuits and the piston end having the larger cross-section via one ne valve control alternating with the under truck fluid this one Circuit or the external ambient pressure, with this valve control being dependent from the fluid temperature in the first circuit so that if the temperature reaches a certain maximum value, the valve an organ for n the connection between the piston end having a larger cross section and either the ambient air or the flow means in the one circuit in the \ Veise controls that # the piston valve works and the flow to allow one of the two circuits to enter the other of the two circuits. 7. @ Device according to claim 1 to 6, characterized in that # the valve control has an electromagnet, which when a predetermined Maximum value of the fluid temperature in the first circuit can be excited, wherein this excitation has the consequence that the piston end, which has a larger cross-section in communication with the pressurized liquid in the one flow circuit and the piston valve is actuated. 8. Device naeb claim 1 to 7 characterized daB the first and second fluid pumps have a chamber each having a Form part of the corresponding fluid circuit, and that the two chambers are arranged essentially next to one another in a common housing, as well as Each housing chamber has a rotor and with the chamber assigned to it form a pampa, the two rotors of which are driven by a common shaft, which extends only at one end of the housing through a side wall of this, voraeoeben next to the part of the fluid circuit forming the chamber is. 9. Apparatus according to claim 1 to 8, characterized in that each rotor is formed as a gear and each chamber at least one further Has gear that kammtjund with the rotor to form a gear pump for each fluid circuit from the rotor rotatable is 1C. Device according to Claims 1 to 9, characterized in that the flow centers in the second circuit to maintain a pressure in this Kraislauf is designed, which is slightly higher than the fluid pressure in the first Circulation is maintained by a diX trained pump. 1st Vorrichtunc according to claim 1 to 10, characterized in that there @ the first fluid circuit has a thermogtatico control device, which controls the heating device when the temperature in the first circuit a reached a predetermined minimum value. 12. The device according to claim 1 to 11, characterized in that one or all of the workers ale production tool, pre # plate or the like are. 13. The device according to claim 1 to 12, characterized in that dal3 3that is used in a prose or the like with tempo control.