DE102018121563A1 - Rotary vane unit for a thermal management module - Google Patents

Abstract

In order to create a rotary slide unit (100) for a thermal management module (200), it is proposed that the sealing seat (13) be a hose element (20) with an axial length (L) that is dependent on the radial extent of a curvature (21). comprises, and the sealing ring (14) is arranged axially between the hose element (20) and the rotary valve (12), the hose element (20) between the feed channel (10) and the discharge channel (11) and thus in use radially in pressure contact on both sides is arranged with the cooling liquid so that the radial extent of the curvature (21) is dependent on the pressure drop (Δ_p), the radial extent of the curvature (21) decreasing with increasing pressure drop (Δ_p) and thereby the axial length (L) of the Hose element (20) increases and / or as a result the axial force (F) of the sealing ring (14) on the rotary slide valve (12) increases.

Description

The invention relates to a rotary slide unit for a thermal management module according to claim 1, and a thermal management module for a motor vehicle according to claim 5.

• - einen Zuführkanal für eine Kühlflüssigkeit;
• - einen Abführkanal für die Kühlflüssigkeit, wobei im Einsatz ein Druckgefälle (Δ_p) von dem Zuführkanal zu dem Abführkanal vorliegt;
• - einen Drehschieber zwischen dem Zuführkanal und dem Abführkanal zum Steuern eines Durchflusses der Kühlflüssigkeit; und
• - einen Dichtsitz für den Drehschieber mit einem bei einer Geschlossen-Stellung des Drehschiebers mit einer Axialkraft (F) gegen den Drehschieber gedrückten Dichtring zum dichtenden Abschließen einer Strömungsverbindung zwischen dem Zuführkanal und dem Abführkanal.

The invention relates to a rotary slide unit for a thermal management module, comprising the following elements:

• - A supply channel for a cooling liquid;
• - A discharge channel for the cooling liquid, a pressure drop (Δ_p) from the feed channel to the discharge channel being present in use;
• - A rotary valve between the supply channel and the discharge channel for controlling a flow of the cooling liquid; and
• - A sealing seat for the rotary valve with an axial force when the rotary valve is in the closed position ( F ) sealing ring pressed against the rotary valve to seal a flow connection between the feed channel and the discharge channel.

Thermal management modules (actively regulated rotary slide valve distribution) are increasingly being used to control coolant flows (internal combustion engine, fuel cell, battery). In order to ensure a leak-free connection of the respective cooling circuits to the control element, the rotary valve, sealing packets are used, which are constructed in several parts. as a rule, these include a metallic guide sleeve, a metallic compression spring, an elastomer O-ring and a plastic sealing ring (usually made of PVDF or PTFE). The sealing packs must be flexible in order to be able to absorb a radial runout (wobble) of the rotary valve.

For example from the EP 3 290 757 A1 according to the summary is a rotary slide valve ( 1 ) of a motor vehicle cooling circuit, with a valve housing ( 10 ), a rule body ( 20th ) which is movable in the valve housing ( 10 ) is arranged and a cylindrical outer contour ( 22 ), whereby by moving the control body ( 20th ) a flow cross section ( 21 ) between a first valve connection ( 11 ) and one perpendicular to a longitudinal valve axis ( A1 ) of the control body ( 20th ) arranged second valve connection ( 12 ) is adjustable, and a sealing unit ( 30th ) inside the second valve connection ( 12 ) on the outer contour ( 22 ) of the control body ( 20th ) is attached. In order to improve the sealing, it is proposed that the sealing unit ( 30th ) a sealing element ( 31 ) for sliding sealing, a support element ( 32 ) to carry at least the sealing element ( 31 ) and a spring element ( 33 ) for axial prestressing of the sealing element ( 31 ), the sealing element ( 31 ) with a control body ( 20th ) facing axial sealing face ( 311 ) on the outer contour ( 22 ) of the control body ( 20th ) and the carrier element ( 32 ) with a control body ( 20th ) facing first axial end ( 326 ) on the sealing element ( 31 ) and with a control body ( 20th ) facing away from the second axial end ( 327 ) on the spring element ( 33 ) is present.

For example from the DE 10 2009 014 047 A1 A control valve is known which, according to the summary, is designed to control a coolant circuit of an internal combustion engine with a first on a valve housing ( 1 ) arranged feed connection ( 2 ) for cooling water of a bypass circuit and at least one second supply connection ( 2 ) for cooling water of a cooler circuit, which, depending on the position of a valve element housed in the valve housing ( 3 ) can be connected to a drain connection. According to the invention, for sealing the coolant flow paths in the axial direction (a) and / or radial direction (b), at least one on the valve member ( 3 ) adjacent, dynamically resilient sealing element ( 4 ) is provided, which consists at least partially of polytetrafluoroethylene or is coated with polytetrafluoroethylene and to ensure a sealing system on the valve member ( 3 ) of the pressure force of a compression spring ( 5 ) is applied.

The object of the invention is to find a rotary slide unit in comparison with the known rotary slide units for a thermal management module, in which a seal remains reliably closed even with a high pressure drop (Δ_p).

This object is achieved by the features specified in claim 1.

According to claim 1, the sealing seat comprises a hose element with an axial length depending on a radial extent of the curvature ( L ), wherein the sealing ring is arranged axially between the hose element and the rotary valve, and
wherein the hose element is arranged between the supply channel and the discharge channel and thus in use radially on both sides in pressure contact with the cooling liquid, so that the radial extent of the curvature depends on the pressure drop (Δ_p).

• - einen Zuführkanal für eine Kühlflüssigkeit;
• - einen Abführkanal für die Kühlflüssigkeit, wobei im Einsatz ein Druckgefälle (Δ_p) von dem Zuführkanal zu dem Abführkanal vorliegt;
• - einen Drehschieber zwischen dem Zuführkanal und dem Abführkanal zum Steuern eines Durchflusses der Kühlflüssigkeit; und
• - einen Dichtsitz für den Drehschieber mit einem bei einer Geschlossen-Stellung des Drehschiebers mit einer Axialkraft (F) gegen den Drehschieber gedrückten Dichtring zum dichtenden Abschließen einer Strömungsverbindung zwischen dem Zuführkanal und dem Abführkanal.

According to a first embodiment of the invention, the rotary slide unit for a thermal management module comprises the following elements:

• - a supply channel for a cooling liquid;
• - A discharge channel for the cooling liquid, a pressure drop (Δ_p) from the feed channel to the discharge channel being present in use;
• - A rotary valve between the supply channel and the discharge channel for controlling a flow of the cooling liquid; and
• - A sealing seat for the rotary valve with an axial force when the rotary valve is in the closed position ( F ) sealing ring pressed against the rotary valve to seal a flow connection between the feed channel and the discharge channel.

The rotary slide unit is characterized in that the sealing seat is a hose element with an axial length (dependent on a radial extent of the curvature ( L ), and the sealing ring is arranged axially between the hose element and the rotary slide valve, the curvature of the hose element between the feed channel and the discharge channel and thus in use being arranged radially on both sides in pressure contact with the coolant, so that the radial extension of the curvature from the adjacent one Pressure drop (Δ_p) is dependent.

According to one embodiment of the rotary slide unit, the convex side is supported radially on the convex side by a spring means.

According to one embodiment of the rotary slide unit, the hose element forms an axial seal to a duct housing and / or to the sealing ring.

According to one embodiment of the rotary slide unit, the supply channel and the discharge channel are formed by a channel housing, and a flow bay toward the hose element is formed in the channel housing on the supply side and / or on the discharge side.

According to a further aspect of the invention, a thermal management module for a motor vehicle is proposed, the thermal management module comprising a heat exchanger and a cooler for a drive machine. The heat exchanger and the cooler are connected to one another in a heat-dissipating manner by means of a coolant circuit via the heat exchanger, a rotary valve unit as described above being provided in the coolant circuit for controlling the flow of coolant.

• 1 in einer schematischen Schnittansicht eine Drehschiebereinheit, und
• 2 in einer schematischen Darstellung ein Thermo-Management-Modul in einem Kraftfahrzeug.

Embodiments of the invention are explained below with reference to the drawing. Show it

• 1 in a schematic sectional view of a rotary valve unit, and
• 2 a thermal management module in a motor vehicle in a schematic representation.

1 shows a schematic sectional view of a rotary valve unit 100 which are for use in a thermal management module 200 , also referred to as a heat management module, for example a controllable cooling circuit for the internal combustion engine of a motor vehicle 300 (compare 2 ) is set up. In the illustration is to the left of a central axis along which the axial direction ( R ) is defined, a pressure drop Δ_p from (according to the illustration) below upwards. In the illustration there is a pressure drop Δ_p from (according to the illustration) from top to bottom to the right of the central axis. For the sake of clarity, the same elements are sometimes only labeled on the left or only on the right.

• - einen Zuführkanal 10 (links unterhalb des Drehschiebers 12 und rechts oberhalb des Drehschiebers 12) für eine Kühlflüssigkeit, welcher beispielsweise mit einer Druckausgabeseite einer Pumpe mittelbar über eine Leitung oder unmittelbar verbunden ist, sodass in dem Zuführkanal 10 ein Zuführ-Druck (p_Z) vorliegt;
• - einen Abführkanal 11 (links oberhalb des Drehschiebers 12 und rechts unterhalb des Drehschiebers 12) für die Kühlflüssigkeit, welcher beispielsweise mit einer Eingangsseite eines Kühlers oder eines Wärmetauschers mittelbar über eine Leitung oder unmittelbar verbunden ist, wobei im Einsatz ein Druckgefälle (Δ_p = p_Z
• - p_A) von dem Zuführkanal 10 zu dem Abführkanal 11 vorliegt, also der Zuführ-Druck (p_Z) in dem Zuführkanal 10 höher ist als der Abführ-Druck (p_A) in dem Abführkanal 11 und somit bei geöffneter Drehschiebereinheit 100 eine Flussrichtung von dem Zuführkanal 10 zu dem Abführkanal 11 vorliegt;
• - einen Drehschieber 12 (hier nur ausschnittsweise gezeigt) zwischen dem Zuführkanal 10 und dem Abführkanal 11 zum Steuern eines Durchflusses der Kühlflüssigkeit durch eine Durchlassöffnung 15 (hier als Ebene senkrecht zu der axialen Richtung (R) gekennzeichnet), wobei der Drehschieber 12 um eine Schieberachse verdrehbar ist, beispielsweise mittels eines Servomotors, und von einer Durchlass-Stellung in eine Geschlossen-Stellung überführbar ist, wobei in der Durchlass-Stellung die Kühlflüssigkeit bei anliegendem Druckgefälle (Δ_p = p_Z - p_A) durch eine Strömungsverbindung 15 von dem Zuführkanal 10 in den Abführkanal 11 strömen kann und in der (gezeigten) Geschlossen-Stellung die Kühlflüssigkeit auch bei anliegendem Druckgefälle (Δ_p) nicht von dem Zuführkanal 10 in den Abführkanal 11 strömen kann; und
• - einen Dichtsitz 13, welcher mittels eines Dichtrings 14 mit dem Drehschieber 12 in der Geschlossen-Stellung des Drehschiebers 12 in dichtendem Kontakt steht, also die Strömungsverbindung 15 abschließt, und dafür der Dichtring 14 mit einer Axialkraft (F) gegen den Drehschieber 12 gedrückt ist, sodass die Strömungsverbindung 15 zwischen dem Zuführkanal 10 und dem Abführkanal 11 geschlossen ist und nicht mehr durchströmbar ist, sodass dann keine konvektive Kühlleistung von dem Thermo-Management-Modul 200 geleistet wird.

The rotary valve unit 100 usually includes, among other elements, the following elements:

• - a feed channel 10 (on the left below the rotary valve 12 and right above the rotary valve 12 ) for a cooling liquid, which is connected, for example, indirectly to a pressure output side of a pump via a line or directly, so that in the supply channel 10 a feed pressure ( p_Z ) is present;
• - a drainage channel 11 (left above the rotary valve 12 and to the right below the rotary valve 12 ) for the cooling liquid, which is connected, for example, directly to an input side of a cooler or a heat exchanger via a line or directly, with a pressure drop (Δ_p = p_Z
• - p_A) from the feed channel 10 to the discharge channel 11 is present, i.e. the supply pressure ( p_Z ) in the feed channel 10 is higher than the discharge pressure ( p_A ) in the discharge channel 11 and thus with the rotary valve unit open 100 a flow direction from the feed channel 10 to the discharge channel 11 is present;
• - a rotary valve 12 (shown here only in part) between the feed channel 10 and the discharge channel 11 for controlling a flow of the coolant through a passage opening 15 (here as a plane perpendicular to the axial direction ( R ))), the rotary valve 12 can be rotated about a slide axis, for example by means of a servo motor, and can be transferred from a passage position into a closed position, the coolant in the passage position when the pressure gradient is applied (Δ_p = p_Z - p_A) through a flow connection 15 from the feed channel 10 in the discharge channel 11 and in the closed position (shown) the coolant cannot flow from the supply channel even when there is a pressure drop (Δ_p) 10 in the discharge channel 11 can flow; and
• - a sealing seat 13 which by means of a sealing ring 14 with the rotary valve 12 in the closed position of the rotary valve 12 is in sealing contact, i.e. the flow connection 15 locks, and therefore the sealing ring 14 with an axial force ( F ) against the rotary valve 12 is pressed so that the flow connection 15 between the feed channel 10 and the discharge channel 11 is closed and can no longer be flowed through, so that then no convective cooling output from the thermal management module 200 is performed.

The rotary valve unit 100 or the sealing seat 13 is characterized in that a hose element 20th with one of a radial extension of the curvature 21 (arched from left to right as shown, with the curvature on the left 21 an extension radially inward and to the right in the illustration the curvature 21 has an extension to the radially outward) dependent axial length ( L ) includes. The amount of length ( L ) is therefore (for example proportionally) dependent on the amount of the curvature 21 , The sealing ring 14 is axial between the hose element 20th and the rotary valve 12 arranged. The hose element 20th has an axial extension, for example in the rotary slide unit 100 perpendicular to one of a sealing line of the sealing seat 13 spanned sealing level, i.e. the passage opening marked here 15 , A vertical alignment has the advantage that by changing the axial length ( L ) of the hose element 20th , from which an axial force ( F ) on the sealing seat 13 results in a very even distribution of axial pressure on each (infinitesimal) section of the sealing line and thus a reliable seal is achieved with simple means.

The hose element 20th is (radial) between the feed channel 10 and the discharge channel 11 and thus arranged radially on both sides in pressure contact with the coolant in use. So it lies over the hose element 20th (at least approximately) the pressure drop (Δ_p = p_Z - p_A). It follows that the radial extent of the curvature 21 depends on the pressure drop (Δ_p). The hose element 20th or its extension of the curvature 21 is arranged in such a way that with increasing pressure drop (Δ_p), i.e. increasing supply pressure ( p_Z ) and / or decreasing discharge pressure ( p_A ), the radial extension of the curvature 21 decreases and thereby the axial length ( L ) of the hose element 20th increases or thereby the axial force ( F ) of the sealing ring 14 on the rotary valve 12 increases.

This has the advantage that the sealing seat 13 with increasing pressure drop ( Δ_p ) has an increasing sealing effect. This is the construction of the sealing ring in one embodiment 14 and / or its border on the movement-free, ie channel-side, seal side can be designed more easily. In one embodiment, the axial force ( F ) can be reduced for a pressure drop (Δ_p) at a desired operating pressure because the sealing effect at higher pressure drops (Δ_p) by means of the increase in the axial force ( F ) by means of the hose element 20th is ensured. So that is the friction on the rotary valve 12 (when opening or closing) can be reduced. The (larger) supply pressure acts on the mountain of the curvature and thus causes the hose element forming a bellows seal to be set up axially 20th , The orientation of the extension of the curvature must be chosen to match the pressure drop (Δ_p).

The (optional) spring means acts like a bandage and, on the one hand, prestresses the bellows seal (with a pressure drop of zero or even negative pressure drop, i.e. higher discharge pressure ( p_A ) as feed pressure ( p_Z )) and prevents the hose element from collapsing 20th radially inwards (with hourglass-shaped hose element 20th ) or radially outwards (with barrel-shaped hose element 20th ). A spring means 22 Designed as a flat ring or a round ring, it can be preloaded radially outside or radially inside. A spring means 22 as a worm spring only acts inwards and can therefore only be used when the bulge extends radially outwards. The radial preload of the spring means 22 acts in the same direction as the pressure drop (Δ_p). The hose element 20th is made of an elastomer, for example. The most suitable material depends on the surrounding medium (e.g. EPDM for pure coolant, or HNBR for oily components). In such a cooling circuit, pressures up to 3 bar act.

In the embodiment shown here, the radial extent of the curvature is (optional) 21 on the convex side of a spring means 22 supported radially. The convex side is on a cross section of the hose element 20th related, so with a barrel-shaped curvature 21 radially outside and with an hourglass-shaped curvature 21 arranged radially inside. This is the hose element 20th with a relatively large wall diameter and / or made of a solid material, so that the hose element 20th to apply a large axial force ( F ) is sufficiently stiff and at the same time reliable for a change in the pressure gradient (Δ_p) a corresponding change in length or change in the axial force ( F ) reacts. At the same time creates the spring means 22 a decrease in radial stiffness from the side of the feed pressure ( p_Z ) and, depending on the design, an increase in radial stiffness compared to the discharge pressure side ( p_A ) and the spring characteristic of the hose element 20th is by means of the spring means 22 securely adjustable. Such a spring means 22 is, for example, a spring steel band, a worm band spring or the like. The axial stroke due to a change in the axial length ( L ) of the hose element 20th causes a radial bulge in the hose element 20th , The size of the bulge 21 can by the hardness of the material and the spring means 22 can be set. The arching is hindered with increasing pressure drop (Δ_p). It should be noted that a bulge 21 can also be referred to as waist if the radial extent of the curvature 21 is directed radially inwards (see illustration on the left in 1 ). The convex side of a waist is then radially inside and the spring means 22 radially inside the hose element 20th arranged so that the spring means 22 counteracts the waist (radially outwards). The spring means 22 can be made of metal or plastic in any cross-section, all-round open or all-round closed.

In the embodiment of the rotary slide unit shown here 100 forms (optionally) the hose element 20th a first axial seal 23 to the duct housing 16 of the feed channel 10 or the discharge channel 11 and a second axial seal 24 to the sealing ring 14 , No additional sealants are required, and the structure is particularly simple. The hose element 20th lies without a gap on both the sealing ring 14 (second axial seal 24 ), for example non-positively, positively clamped, or chemically bonded (for example by means of 2-component injection molding) and in the same or different way to the housing (first axial seal 23 ). Due to the elastic properties, there is a good sealing effect. The hose element 20th is in one embodiment in a groove in the sealing ring 14 inserted and clamped captive. The hose element is on the housing side 20th supported against a step and thus securely positioned.

In the embodiment of the rotary slide unit shown here 100 are the feed channel 10 and the discharge channel 11 from a (common) duct housing 16 formed, the channel housing being formed, for example, in one piece. In the duct housing 16 is a flow bay (in the embodiment as shown on the left) on the supply side and (in the embodiment as shown on the right) on the discharge side 17 towards the hose element 20th educated. In this current bay 17 there is (approximately) the static pressure of the respective channel. Of dynamic (brief) pressure changes, for example on the discharge side when the rotary valve opens 12 , the hose element remains 20th (almost) unaffected.

In a structure according to an embodiment of the rotary slide unit described above 100 is a stronger hitting of the rotary valve 12 tolerable without loss of tightness. The rotary valve unit 100 is not the only one in a thermal management module 200 can be used, but in any application with flow control using a rotary valve 12 ,

In 2 is a thermal management module 200 in a motor vehicle 300 shown. The thermal management module 200 includes a heat exchanger 30th , for example a grille, and a radiator 31 , for example a cooling chamber integrated into an engine block for one or more combustion chambers of an engine 40 , The prime mover 40 is by means of a coolant circuit 32 via the heat exchanger 30th connected in a heat-dissipating manner, with a rotary slide unit for controlling or regulating the flow of a cooling liquid and / or the temperature, for example of the combustion chamber 100 , for example as in 1 shown and / or described above, in the coolant circuit 32 is provided.

Reference list

100

Rotary valve unit

200

Thermal management module

300

Motor vehicle

10

Feed channel

11

Discharge channel

12th

Rotary valve

13

Sealing seat

14

Sealing ring

15

Flow connection

16

Duct housing

17

Current bay

18th

Radial stop

20th

Hose element

21

Bulge

22

Spring means

23

first axial seal

24

second axial seal

30

Heat exchanger

31

cooler

32

Coolant circuit

40

Prime mover

F

Axial force

L

axial length

R

axial direction

p_Z

Feed pressure

p_A

Laxative pressure

Δ_p

Pressure drop

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 3290757 A1 [0004]
• DE 102009014047 A1 [0005]

Claims (5)

Rotary vane unit (100) for a thermal management module (200), comprising the following elements: - a supply channel (10) for a cooling liquid; - A discharge channel (11) for the cooling liquid, a pressure drop (Δ_p) from the feed channel (10) to the discharge channel (11) being present in use; - A rotary slide valve (12) between the feed channel (10) and the discharge channel (11) for controlling a flow of the cooling liquid; and - a sealing seat (13) for the rotary slide valve (12) with a sealing ring (14) pressed against the rotary slide valve (12) with an axial force (F) when the rotary slide valve (12) is closed, for sealingly closing off a flow connection (15) between the feed channel (10) and the discharge channel (11), characterized in that the sealing seat (13) comprises a hose element (20), the hose element (20) having a curvature (21) with a radial extension and one of the radial extension the curvature (21) has a dependent axial length (L), and the sealing ring (14) is arranged axially between the hose element (20) and the rotary slide valve (12), the curvature (21) of the hose element (20) between the feed channel ( 10) and the discharge channel (11) and thus in use is arranged radially on both sides in pressure contact with the coolant, so that the radial extent of the curvature (21) is dependent on the pressure drop (Δ_p). Rotary slide unit (100) after Claim 1 , The radial extension of the curvature (21) on the convex side being supported radially by a spring means (22). Rotary slide unit (100) according to one of the preceding claims, wherein the hose element (20) forms an axial seal (23, 24) to a channel housing (16) and / or to the sealing ring (14). Rotary vane unit (100) according to any one of the preceding claims, wherein the feed channel (10) and the discharge channel (11) are formed by a channel housing (16) and in the channel housing (16) on the feed side and / or discharge side a flow bay (17) to the Hose element (20) is formed. Thermal management module (200) for a motor vehicle (300), comprising a heat exchanger (30) and a cooler (31) for a drive machine (40), which are connected to one another in a heat-dissipating manner by means of a coolant circuit (32) via the heat exchanger (30) are, for controlling the flow of a cooling liquid, a rotary valve unit (100) according to one of the preceding Claims 1 to 4 is provided in the coolant circuit (32).

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