Non-return valves, especially for cooling or heat circuits

Abstract

The present invention relates to a check valve, in particular for a cooling or heating circuit, which can be inserted into a connection opening (26, 27, 28, 29) of a connecting device (21) or a pipe (39), the check valve having a valve closing element (61) with a closing body (65), a closing surface (108) of which abuts against a valve seat (75) in the initial position (62) of the valve closing element (61) and closes the through opening (24), the closing body (65) having at its free end face (101) a concave contour (102) extending from the closing surface (108) in the direction opposite to the movement of the closing body (65) into the operating position (63) and connected to the closing surface (108) by a convex contour (105).

Description

[Technical Field]

[0001] The present invention relates to a check valve, in particular for a cooling or heating circuit. [Background technology]

[0002] WO 2019 / 219732 A1 discloses a check valve for a cooling or heating circuit that can be inserted into an inlet opening of a connecting device or pipe, the check valve comprising a one-piece or multi-part housing with at least one base housing, a supply inlet on the inlet side of the base housing, and a discharge outlet on the outlet side of the base housing, the supply inlet and the discharge outlet being connected to each other by a flow path.

[0003] The base housing includes at least one guide element that guides the valve closure element so that it can be moved from a start position or a closed position to an actuated position or an open position. The force accumulation element acts in a direction opposite to the opening movement of the valve closure element. The base housing, the guide element, and the force accumulation element acting on the valve closure element are provided downstream of a valve seat on which a closing surface of a closure body of the valve closure member rests in the start position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 219732(A1) Summary of the Invention [Problem to be solved by the invention]

[0005] The invention is based on the problem of creating a check valve which makes it possible to reduce the pressure loss of the medium flowing through the check valve. [Means for solving the problem]

[0006] This problem is solved by a valve closure element, in particular a check valve with a closure body with a closure surface downstream, preferably adjacent to the closure surface, and a sealing element that abuts against the valve seat in an initial position to close the flow path, the closure body extending into the operating position in a direction opposite to the movement of the closure body from the closure surface, and the closure body having a concave contour at its free end surface, connected to the closure surface of the closure body by a convex contour. This shape of the closure body extending in a direction opposite to the direction of medium flow starting from the valve seat or the closure surface resting on the valve seat, allows for flow optimization to be achieved. In particular, this reduces turbulence in the medium, especially when flowing toward the valve seat. Pressure losses can be reduced by increasing the laminar flow fraction in the medium flowing through the open check valve. Particularly for check valves used on the low-pressure side of a cooling or heat circuit, reducing pressure losses can lead to improved efficiency. This can have a favorable effect on heat dissipation, for example, and can therefore increase it.

[0007] It is preferred to form a flow transition between the closure surface of the closure body through a concave profile starting from the front end of the closure body and a convex profile, advantageously with a gentle slope to achieve a smooth flow field.

[0008] Furthermore, it is preferred that the concave contour merges directly into the convex contour at the end of the free end face of the closure, and that the convex contour merges directly into the closure surface, meaning that no straight lines are formed. A direct transition between the contours and from the concave contour to the closure surface can further optimize the flow.

[0009] The length L of the closure body from the closing face to the end face of the closure body is preferably longer than the movement of the closure body from the starting position to the working position, which means that the closure body is positioned towards or in the inlet opening regardless of the opening stroke of the closure body, and the closure body acts to promote flow, particularly to reduce pressure losses.

[0010] Preferably, the length F of the guide surface on the guide rib Ris the guide length F between the sleeve of the base housing and the guide part of the closure body facing the base housing L This means that the closure body can be guided between the guide rib and the valve seat or the inlet opening in the first stroke phase, and the closure body can be guided above the base housing in the second stroke phase. This allows the closure body to be guided over the entire opening stroke of the valve closure element. In addition, the passage can be completely open at the valve seat.

[0011] The concave profile formed at the front end of the closure may be hemispherical or have a parabolic cross section. Away from the front end of the closure, the hemispherical or parabolic profile may have an equatorial plane with a radius R1 smaller than the cross section of the closure surface. This radius R1 may be an optimization variable for reducing pressure loss.

[0012] The convex profile on the closure extending between the concave profile and the closure surface of the closure preferably has a radius R2, which allows for a continuous transition. Alternatively, the convex profile curve formed by a curve with a varying slope or radius, rather than a radius R2, can be provided. In particular, the slope increases or the radius becomes smaller in the transition direction leading to the closure surface of the closure element. As a result, the closure widens from the front end of the closure toward the closure surface.

[0013] According to another advantageous embodiment, it is provided that the radius R2 of the convex contour is greater than the radius R1 of the concave contour.

[0014] According to another advantageous embodiment of the closure, it may be provided that the radius R1 of the equatorial plane or of the concave contour is smaller than the radius R3 determining the cross-sectional area of ​​the closure surface of the closure.

[0015] Advantageously, it may be provided that the length L of the closure body from the closure face to the end of the free end face of the closure body is in the range of 0.25 to 5 times the radius R1 of the concave contour. With such a geometry, a further reduction in pressure loss can be achieved.

[0016] Preferably, the free end face end of the closure body extends upstream beyond the valve seat after the valve closure member has assumed its operative position, and preferably the end of the closure body protrudes into the inlet opening adjacent the valve seat when the valve closure member is in its operative position.

[0017] Moreover, an advantageous design of the closure can be provided by a ratio between the cross-sectional area of ​​the closure face and the length of the closure starting from the closure face to the end face of the closure, in the range of 3 to 0.3.

[0018] In another preferred embodiment, it is provided that the guide ribs extend from the closing face of the closure body in the direction of the free end face of the closure body or up to the free end face of the closure body, so that even during the opening stroke, the guide ribs can guide the closure body, which extends in the opposite direction to the flow direction, centrally relative to the valve seat, so that uniform flow conditions can be maintained regardless of the magnitude of the opening stroke.

[0019] In particular, two or more guide ribs, preferably aligned at the same circumferential angle with respect to one another, are provided on the closure body of the valve closure element, for example in a star-shaped arrangement or in an arrangement in which the guide ribs take the form of the mathematical sign plus,

[0020] The guide ribs on the closure body preferably have guide surfaces aligned parallel to one another and extending from the closing surface of the closure body in the direction of the free end surface of the closure body, in particular providing for guiding the guide surfaces of the guide ribs along the inner wall of the inlet opening or in the transition area between the valve seat surface of the valve seat and the inner wall of the inlet opening.

[0021] An inlet surface can be formed between the guide surface of the guide rib and the free end surface of the closure body. This inlet surface can be straight, rounded or even curved. If straight, the inlet surface is preferably inclined at an angle of less than 60° to the longitudinal axis of the valve closure element.

[0022] The guide surfaces of the guide ribs preferably extend from the closure face of the closure body at least to the equator plane of the concave profile.

[0023] Furthermore, it is preferable that the guide surface of the guide rib has a length F shorter than the maximum movement of the closure body or the opening stroke of the closure body from the starting position to the operating position. R It may be specified that the

[0024] Instead, the guide surface of the guide rib has a length F greater than the maximum movement of the closure body from the start position to the operating position. R This also makes it possible to provide a guide in the direction of flow in the inlet opening of the valve housing at the end face of the closure body.

[0025] Furthermore, it can be provided that at least one guide element is provided on the valve closing member, in particular aligned opposite the closing body of the valve closing member, by means of which the valve closing member is displaceably guided within the base housing, preferably during the entire actuation stroke of the valve closing member between the actuation position and the start position within the base housing, so that the at least one guide element allows the valve closing member to be continuously guided to the base housing during opening or closing of the valve closing member.

[0026] According to a preferred embodiment of the check valve, the guide rib guides the valve closing member through the inlet opening during the first stroke from the start position towards the actuated position to the intermediate position, and preferably during the second stroke from the intermediate position to the actuated position. The guide rib is released from the inlet opening, and the valve closing member is guided by the guide part of the closure body within the base housing, in particular within the sleeve of the base housing. This allows the valve closing member to be guided twice during the entire opening or actuating stroke. During the second stroke, from the intermediate position to the actuated position, the guide rib is no longer guided within the inlet opening, thereby increasing the free flow rate.

[0027] Preferably, the length F of the guide surface on the guide rib R is the guide length F between the sleeve of the base housing and the guide part of the closure body facing the base housing L This allows the closure body to be guided over the entire opening stroke of the valve closure element.

[0028] The invention, as well as other advantageous and alternative embodiments of the invention, will be described and explained in more detail below with reference to examples shown in the drawings, in which the features taken from this description and the drawings can be used according to the invention individually or in any combination. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 2 is a schematic diagram of a cooling circuit. [Figure 2] 1 is a schematic cross-sectional view of a connection device with a check valve. [Figure 3] 1 is a perspective view of a first embodiment of a check valve; FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of a check valve such as that shown in FIG. 3. [Figure 5] 4 is a schematic cross-sectional view of the check valve according to FIG. 3 in the installed state. [Figure 6] 4 is a schematic cross-sectional view of an alternative embodiment of the check valve according to FIG. 3 in an installed state. [Figure 7] 4 is a schematic cross-sectional view of the check valve according to FIG. 3 with the valve housing in another installation state. [Figure 8] 4 is a perspective view of an alternative embodiment of a check valve to FIG. 3. FIG. [Figure 9] 9 is a schematic cross-sectional view of the check valve according to FIG. 8 in the initial position. [Figure 10] 9 is a schematic cross-sectional view of the check valve according to FIG. 8 in the actuated position. DETAILED DESCRIPTION OF THE INVENTION

[0030] FIG. 1 shows a conventional design of a cooling or heat circuit 11, preferably used in a motor vehicle, specifically an air conditioning system. A compressor 12 compresses a refrigerant. This refrigerant can be, for example, R134a, R1234yf, or CO2. The compressed refrigerant is fed to a condenser 13, which exchanges heat between the compressed refrigerant and the environment to cool the refrigerant. An accumulator 17 or collector may be provided downstream of the condenser 13 to separate the gas and liquid refrigerants and simultaneously collect the liquid refrigerant. The refrigerant leaving the condenser 13 or accumulator 17 reaches an internal heat exchanger 14. An expansion valve 15 is provided between the internal heat exchanger 14 and heat exchanger 16. The expansion valve 15 regulates the mass flow of the cooling or heat circuit 11 depending on the pressure difference. The high-pressure refrigerant expands through the expansion valve 15 and reaches the heat exchanger 16 on the low-pressure side. From the heat exchanger 16, the refrigerant absorbs heat from the environment. From there, the refrigerant returns to the condenser 12 via an internal heat exchanger 14 .

[0031] When using a connection device 21 as described below according to FIG. 2 in such a cooling circuit, the design of the cooling circuit 11 according to FIG. 2 deviates in that the expansion valve 15 is not arranged separately in the pipe section between the internal heat exchanger 14 and the heat exchanger 16, but is instead integrated, for example, in the connection block 22.

[0032] The connection device 21 shown in FIG. 2 has an inlet opening 26 of the first through-hole 24, which is connected to an outlet opening 27 via a throttle point 31. The outlet opening 27 is connected to the inlet of the heat exchanger 16. A second through-hole 25 is provided in the connection device 21 adjacent to the outlet opening 27. An inlet opening 28, connected to the outlet of the heat exchanger 16, receives the refrigerant coming from the heat exchanger 14 and supplies it to an outlet opening 29 of the second through-hole 25. The inlet opening 26 of the first through-hole 24 and the outlet opening 29 of the second through-hole 25 are provided in a common connecting bore 33. An end portion of the internal heat exchanger 14 can be inserted into this common connecting bore 33. The internal heat exchanger 14 has an outer tube 36, the outer circumference of which presses against the bore portion 35 of the connecting bore 33 and extends at least partially into the connecting bore 33. An annular collar 37 or flange or other connection point is preferably provided in the outer tube 36, which is placed against the connection block 22 and secures the internal heat exchanger 14 to the connection block 22.

[0033] The outer tube 36 of the internal heat exchanger 14 extends close to or up to the throttle point 31 without covering it. The inner tube 39 of the internal heat exchanger 14 protrudes from the outer tube 36 and preferably rests against an end face 40 formed in the transition region 34 between the outlet opening 29 and the bore portion 35. In such an arrangement, the inlet opening 26 of the first through hole 24 is formed by an annular channel between the inner tube 39 and the bore portion 35 of the connecting hole 33.

[0034] In this connection device 21, for example, an expansion valve 45 is connected downstream of the throttle point 31 in the direction of refrigerant flow.

[0035] The check valve 41 can be inserted in the outlet opening 29 of the second through-hole 25 of the connection block 22. Alternatively, the check valve 41 can also be inserted in one end of the inner tube 39 of the internal heat exchanger 14. In either case, the check valve 41 is arranged adjacent to or adjacent to the end face 40, thereby avoiding the formation of any further interfaces. Also, check valves 41 can be used in other circuits to ensure a one-way flow of the medium. In particular, check valves 41 are used on the low-pressure side and / or the suction side.

[0036] FIG. 3 shows a first embodiment of a check valve 41 .

[0037] FIG. 4 is a schematic cross-sectional view of a check valve such as that shown in FIG.

[0038] The check valve 41 comprises a base housing 44 having an annular shape. A guide element 53 is provided in the central region of the base housing 44. The guide element 53 is accommodated, for example, by at least one longitudinal rib 56, preferably three longitudinal ribs 56. The guide element 53 may comprise a sleeve 54, shown in cross section in FIG. 4. A recess 52 may be provided between the sleeve 54 and the guide element 53. The guide element 53 comprises at least one opening 57, preferably three openings 57, which are connected to one another. The openings 57 are arranged, for example, in a star shape. Preferably, the openings 57 extend longitudinally relative to the longitudinal rib 56.

[0039] The base housing 44 may have a peripheral shoulder 95 creating a radially outwardly directed protrusion, which may serve as a stop for positive mounting of, for example, the check valve 41. The base housing 44 may also have a connecting portion 85, which may be used to attach the valve housing 43 to the base housing 44 using the connecting portion 84 arranged above. Such an arrangement of the valve housing 43 on the base housing 44 is shown, for example, in FIG. 7.

[0040] The cross-sectional view according to FIG. 4 shows that at least one guide rod 59 extends inside the valve closure member 61. This guide rod 59 extends from the closure member 65 in the direction of the base housing 44. A locking element 60 is provided at the end of the guide rod 59. This locking element 60 faces radially outward. The guide rods 59 have cross-sectional dimensions that allow them to be guided in the openings 57. Advantageously, three guide rods 59 are aligned in a star shape. To connect the valve closure element 61 to the base housing 44, the guide rods 59 are moved toward each other so that the locking element 60 can be guided through the openings 57. The guide rods 59 then return to their starting position. A force accumulation element 71 acting between the base housing 44 and the valve closure element 61 positions the valve closure element 61 in an initial position 62 relative to the base housing 44. The displacement movement of the valve closure member 61 relative to the base housing 44 is limited by the corresponding locking element 60 of at least one guide rod 59. This locking element 60 rests on the outside of the base 55 on the guide element 53 and limits the displacement movement.

[0041] In this starting position 62, a force accumulation element 71 can be preloaded between the base housing 44 and the valve closing element 61. This allows for adjusting the opening force of the valve closing element 61. A faster closing movement from the actuated position to the starting position 62 can also be achieved.

[0042] An axial guide is formed between the guide portion 66 of the valve closing member 61 and the sleeve 54 of the guide element 53. Preferably, an axially displaceable seal may also be provided between the guide portion 66 and the sleeve 54. The valve closing member 61 has a recess 79 adjacent to the valve seat 75 in which a sealing element 81 is arranged.

[0043] The closure body 65 of the valve closure element 61 can be asymmetrically stretched in the region between the sealing element 81 and the base housing 44. For example, a one-sided contour 96 can be provided opposite a curved path 97. The curved path 97 of the closure body 65 can have a flow-optimized path. The one-sided contour 96 can achieve an increased flow rate.

[0044] At least one guide rod 59 can additionally provide guidance for an internal force accumulation element 71. The force accumulation element 71 is preferably provided inside the sleeve 54 and the guide portion of the guide element.

[0045] The closure body 65 of the valve closure member 61 extends from the sealing element 81 in the direction away from the base housing 44. This closure body 65 has a concave contour 102 at its free end 101. Starting from the concave contour 102 and moving toward the sealing element 81, the concave contour 102 adjoins a convex contour 105 that merges into a closure surface 108 of the closure body 65. This closure surface 108 adjoins the sealing element 81 or a recess 79 in the closure body 65. The closure surface 108 can be formed in a flat or linear abutment in the valve seat 75. The concave contour 102 can be semicircular and terminate at an imaginary equatorial plane 103 far from the free end 101. In the case of a semicircular contour, the equatorial plane 103 corresponds to twice the radius R1, which determines the curvature of the concave contour 102. Alternatively, it may be provided that the concave contour 102, when viewed in cross section, is formed by a parabola which also ends in an equatorial plane 103. Immediately from this equatorial plane 103, a convex contour 105 extends in the direction of the closure surface 108 of the closure body 65. The convex contour 105 may have a constant curvature of radius R2. The convex contour 105 may also be formed with an increasing slope in the direction of the closure surface 108.

[0046] Adjacent to the sealing element 81, the closing surface 108 has a cross-sectional area 109 of radius R3, which corresponds to the cross-sectional area for the through opening 24 in the valve seat 75, in which the valve closing member 61 rests in its initial position, closing the through opening 24.

[0047] Figure 5 shows a schematic diagram of the check valve 41 according to Figures 3 and 4 in a first installed state. In this embodiment, the connection openings of the connection device 21 or pipe 39 are shown. The connection openings may be outlet openings and / or inlet openings 26, 27, 28, 29. The check valve 41 closes the through opening 24 in the case of a one-way flow.

[0048] The base housing 44 presses against the stepped section at the connection opening of the connection device 21 with a shoulder 95. As a result, the check valve 41 assumes a defined position within the connection opening. The check valve 41 can be installed with a defined preload force of the energy storage element 71. In this case, the force storage element 71 is subjected to a compressive force between the valve closing member 61 and the base housing 44, which preferably corresponds to the closing force of the valve closing member 61. A valve seat 75 is formed by a constriction in the through-opening 24. The closing body 65 and the seal 81 of the valve closing element 61 press against this valve seat 75. In the starting position 62 of the check valve 41 shown in FIG. 5, the through-opening 24 is closed.

[0049] By varying the distance between the valve seat 75 and the base housing 44 of the check valve 11 in the connection opening of the connection device 21, the preload and therefore the opening time of the energy storage element 71 can be adjusted.

[0050] When pressure is applied to the valve closing element 61 by the medium, the valve closing element 61 moves toward the base housing 44, preferably after overcoming a set preload force. The valve closing element 61 moves into the actuated position 63. As a result, the closing body 65 of the valve closing member 61 lifts away from the valve seat 75, allowing the medium to flow toward the base housing 44. For example, the medium passes through the at least one flow path 49 through the outlet 51.

[0051] The closure body 65 is stationary, with the closure surface 108 of the closure body 65 in the initial position 62 within the valve seat 64. In this embodiment of the check valve 41, the closure body 65 extends beyond the valve seat 64 in a direction opposite to the direction of flow.

[0052] For example, the closure body 65 may have a radius R1 relative to the equatorial plane 103 that is smaller than the radius R3 of the cross-sectional area where the closure surface 108 is located. Preferably, R1 is smaller than 0.5R3 or 0.25R3. It may also be provided that the radius R1 relative to the concave contour 102 is smaller than the radius R2 of the convex contour 105. It may also be provided that the distance L from the sealing element 81 or the closure surface 108 to the free end face edge of the closure body 101 is in the range of 0.5 to 5 times the radius R1. It may also be provided that the length L is longer than the opening stroke of the valve closure member from the start position 62 to the actuated position 63. It may also be provided that the ratio of the radius R3 of the cross-sectional area of ​​the closure surface 108 to the length L from the closure surface 108 to the end face edge 101 of the closure member 65 is in the range of 4 to 0.25.

[0053] FIG. 6 is a schematic cross-sectional view of an alternative embodiment of the check valve 41 according to FIG. 3 in a similar installation state as in FIG. 5. This embodiment of the check valve 41 corresponds to the check valve of FIGS. 3 to 5. Additionally, guide ribs 82 are provided on the closure body 65 of the check valve 41 according to FIG. 6. These guide ribs 82 preferably extend from the closure face 108 toward the free end face 101 of the closure body 65. Advantageously, two or more guide ribs 82 are provided. These guide ribs 82 have guide faces 83 that are preferably aligned parallel to one another. The guide faces 83 are aligned coaxially with respect to the longitudinal axis of the valve closure member 61 or with respect to the stroke movement of the valve closure member 61. The guide faces 83 may have an inlet face 111 that begins at one end of the guide face 83 and merges into the convex contour 105 or the concave contour 102. The inlet face 111 may also merge directly into the end face 101 of the concave contour 102.

[0054] The guide surface 83 preferably has a length F R The length F of the guide surface 83 of the guide rib 82 R is preferably the length F of the guide formed between the sleeve 54 on the base housing 44 and the guide portion 66 on the closure 65. L Moreover, it may be preferably provided that the guide surface 83 of the guide rib 82 has an outer periphery that corresponds to the inner diameter of the through opening 24.

[0055] 7 shows a schematic cross-sectional view of the check valve 41 according to FIGS. 3 to 5, further comprising a valve housing 43. The valve housing 43 comprises a connecting portion 84 which engages with a connecting portion 85. Preferably, the connecting portion 85 is provided outside and surrounds the connecting portion 84. Alternatively, an interchangeable arrangement can also be provided. This connection interface 46 can comprise a plug-in connection, a latch connection, a snap connection, a crimp connection, or a screw connection. This connection can be detachable or non-detachable.

[0056] The length of the valve housing 43 or the distance between the valve seat 75 and the connection interface 84 or base housing 44 can determine the preload force acting on the force accumulation element 71 .

[0057] Starting from the base housing 44, the valve housing 43 may have an inner wall portion that preferably continuously tapers in cross section to form a constriction up to the valve seat 75. The inner cross section of the valve housing 43 then gradually expands again.

[0058] On the outer periphery of the valve housing 43 there is provided a recessed receptacle for another sealing element 89 to seal the connection point in the connection device 21 .

[0059] A tubular collar 87 on the end face of the valve housing 43 presses against a shoulder of the connection device 21. This allows the check valve 41 to be installed in a defined position relative to the connection device 21 or the connection opening in the pipe 39.

[0060] The mode of operation of this check valve 41 corresponds to the check valve of Figures 3 to 5. Like the embodiment of Figure 6, the check valve 41 shown in Figure 7 may also have guide ribs 82 with guide surfaces 83.

[0061] 8 to 10 show another alternative embodiment of a check valve 41 to the embodiment described above.

[0062] This embodiment of the check valve 41 according to Figures 8 to 10 comprises a base housing 44 for receiving a valve closing member 61 with a guide rod 59 guided in at least one guide element 53 according to Figures 3 to 5. Furthermore, the check valve 41 can comprise a valve housing 43 which can be connected to the base housing 44 by means of a removable interface 46.

[0063] In this alternative embodiment shown in Figures 8 to 10, the design of the closing body 65 of the valve closing member 61 differs from the embodiment shown in Figures 3 to 5. However, the shape of the closing body 65, starting from the closing surface 108 to the free end surface 101, corresponds to the embodiment described above. Furthermore, a sealing element 81 is provided on the valve closing member 61. The closing surface 108 of the closing member 65 is in contact with the valve seat surface 76 of the valve seat 75 and absorbs the closing force of the energy storage element 71. The sealing element 81 is also in contact with the valve seat surface 76, but only in a sealing manner. This valve seat 75 preferably has the shape of a cone expanding in the direction of flow from the inlet openings 26, 28 to the outlet openings 27, 29. This causes the cross-section of the flow passage 49 to expand. This has the advantage that as the cross-sectional area increases, the flow velocity of the medium decreases, thereby reducing the pressure loss of the flow.

[0064] The closure body 65 is preferably designed with a length such that the end face edge 101 is positioned inside the inlet opening 28 regardless of the opening stroke of the valve closure member 61. In this case, the end face edge 101 of the closure body 65 can extend up to or beyond the transition between the valve seat surface 76 and the inner wall 74 of the inlet opening 26 in the direction of the inlet opening 26. This embodiment is also applicable to the embodiments described above.

[0065] Guide ribs 82 facing the inlet openings 26, 28 are provided on the closure body 65. The closure body 65 and the guide ribs 82 arranged thereon with the guide surfaces 83 advantageously correspond to the embodiment shown in FIG. 6. During the movement of the valve closure member 61 from the start position 62 into the actuated position 63, the guide surfaces 83 of the guide ribs 82 can be guided on the valve seat 75 or on the through-opening 24 of the valve housing 43, thereby providing axial guidance for the valve closure member 61. The guide surfaces 83 of the guide ribs 82 can also be short, so that they only provide guidance until they guide the guide portion 66 of the closure member 65 through the sleeve 54. Thus, the guidance provided by the guide ribs 82 only acts during the initial opening phase of the valve closure member relative to the valve seat, up to the intermediate position. During the other movement path or opening stroke from the intermediate position to the actuated position 63, guidance acts between the guide portion 66 of the closure member 65 and the base body 44 or the sleeve 54 of the base body 44. The guide rod 59, and other guides formed by the perforations 57 in the base housing 44, act continuously over the entire stroke path or translational movement between the actuated position 63 and the start position 62. The same applies to the translational movement of the valve closure member 61 from the actuated position 63 to the start position 62.

[0066] In this alternative embodiment, the guide portion 66 and the sleeve 54 do not engage with each other in the initial position 62 of the valve closure member 61. Rather, the guide portion 66 and the sleeve 54 are arranged separately from each other. As soon as the guide surface 83 of the guide rib 82 on the closure body 65 moves away from the valve seat 75 during the transition of the valve closure member 61 from the first opening stage to the second opening stage, the guide portion 66 and the sleeve 54 engage with each other and form an axial guide for the valve closure member 61. In the operating position of the valve closure member 61, as shown in FIG. 10 , the guide portion 66 and the sleeve 54 engage with each other such that the force storage element 71 is completely enclosed. The flow passage 49 extends outside the valve closure member 61, the guide portion 66, and the sleeve 54, so that the flow medium does not come into contact with the energy storage element 71.

[0067] The guide ribs 82 provided on the closure body 65 also have the advantage of acting as so-called flow straighteners, i.e. calming the flow of the medium and thereby further reducing the pressure loss of the flow.

Claims

1. A check valve, in particular for a cooling or heating circuit, which can be inserted into a connection opening (26, 27, 28, 29) of a connection device (21) or a pipe (39), a one-piece or multi-part housing (42) with at least one base housing (44), wherein a supply port (48) is provided on the inlet side of said base housing (44) and a discharge port (51) is provided on the outlet side of said base housing (44), said supply port (48) and said discharge port (51) being connected to each other by a flow path (49); a guide element (53) arranged on the base housing (44) and displaceably guiding a valve closing member (61), the valve closing member (61) being arranged in an initial position (42) by a force accumulation element (71) and displaceable in the direction of the outlet (51) into an actuated position (63) against the force of the force accumulation element (71); a closing body (65) arranged on the valve closing element (61) and having a closing surface (108) that, in the initial position (62) of the valve closing element (61), abuts against a valve seat (75) of the connection device (21) or of the pipe (39) or against a valve housing (43) of the housing (42) and closes the through-opening (24); a sealing element (81) arranged adjacent to said closure body (65) bearing against said valve seat (75); Equipped with The base housing (44), the guide element (53) and the force accumulation element (71) acting on the valve closing member (61) are arranged downstream of the valve seat (75). In a check valve, - the closure body (65) extends from the closure surface (108) in a direction opposite to the movement of the valve closure member (61) from the starting position (62) into the operating position (63); and - said closure body (65) has, at its free end face (101), a concave contour (102) connected to said closure face (108) by a convex contour (105); A check valve characterized by:

2. 2. A check valve according to claim 1, characterized in that a flow transition is formed between the concave contour (102) and the closing surface (108) by the convex contour (105).

3. 3. A check valve according to claim 1 or 2, characterized in that the concave contour (102) merges directly into the convex contour (105), and the convex contour (105) merges directly into the closing surface (108) of the closing body (65).

4. 4. The check valve according to claim 1, wherein the length L of the closing body (65) from the closing surface (108) to the free end face end (101) of the closing body (65) is longer than the movement of the valve closing member (61) from the starting position (62) into the operating position (63).

5. The closure body (65) is formed hemispherically or with a parabolic cross section at the free end face (101) of the closure body (65), and the radius R of the cross-sectional area (109) of the closure surface (108) is ３ A radius R smaller than １ 5. The check valve according to claim 1, wherein the equatorial plane (103) of the valve is formed by the concave contour (102) far away from the free end face (101).

6. The convex contour (105) between the concave contour (101) and the closing surface (108) has a radius R ２ or by a curve of varying slope or of varying radius, in particular a curve of increasing slope or of decreasing radius in the direction of the closing surface (108) in order to widen the convex contour (102), preferably the radius R of the convex contour (105) ２ is the radius R of the concave contour (102) １ The check valve according to any one of claims 1 to 5, characterized in that it is greater than

7. The length L of the closure body (65) starting from the closure surface (108) to the free end face end (101) of the closure body (65) is the radius R of the equatorial plane (103). １ The check valve according to any one of claims 4 to 6, wherein the pressure is in the range of 0.25 to 5 times the pressure.

8. 8. A check valve according to claim 1, wherein the free end face edge (101) of the closure body (65) extends upstream beyond the valve seat (75) after the valve closure member (61) has assumed the operating position (63), and preferably the end (101) of the closure body (65) in the operating position (65) of the valve closure member (61) protrudes into the inlet opening (26) adjacent to the valve seat (75).

9. The radius R of the cross-sectional area of ​​the closing surface (108) ３ and the length L of the closing body (65) starting from the closing surface (108) to the free end face end (101) of the closing body (65) is in the range of 3 to 0.

3.

10. 10. A check valve according to claim 1, wherein the guide rib (82) extends from the closing face (108) of the closing body (65) in the direction of the free end face (101) of the closing body (65) or up to the free end face (101) of the closing body.

11. 11. A check valve according to claim 10, characterized in that two or more of said guide ribs (82) are provided on said closure body (85), preferably arranged at the same peripheral angle with respect to one another.

12. 12. A check valve according to claim 10 or 11, characterized in that the guide ribs (82) have guide surfaces (83) which start from the closing face (108) of the closing body (65) and extend in the direction of the free end face edge (101) of the closing body (65), are aligned parallel to one another and are preferably guided along the inner wall (74) of the inlet opening (28) or in the transition area between the valve seat surface (76) of the valve seat (75) and the inner wall (74) of the inlet opening (26).

13. 13. The check valve according to claim 12, wherein a straight, curved or rounded inlet surface (111) is formed between the guide surface (83) of the guide rib (82) and the free end face end (101) of the closure body (65).

14. 14. A check valve according to claim 12 or 13, characterized in that the guide surface (83) of the guide rib (82) extends at least from the closing surface (108) of the closing body (65) to the equatorial plane (103) on the closing body (65).

15. The guide surface (83) of the guide rib (82) has a length F shorter than the maximum movement of the closure body (65) from the starting position (62) into the operating position (63). Ｒ The check valve according to any one of claims 12 to 14, characterized in that it has

16. The guide surface (83) of the guide rib (82) has a length F equal to or greater than the maximum movement of the closure body (65) from the starting position (62) to the operating position (63). Ｒ The check valve according to any one of claims 12 to 14, characterized in that it has

17. 16. The check valve according to claim 10, wherein the valve closing member (61) is guided by the guide rib (82) in the inlet opening (26) from the start position (42) in the direction of the actuated position (63) to an intermediate position during a first stroke phase, and preferably from the intermediate position during a second stroke phase to the actuated position (63) in which the guide rib (82) is free from the inlet opening (26), and is guided by a guide portion (66) of the closure body (65) and a guide portion (66) of the base housing (44), in particular a sleeve (54) of the base housing (44).

18. The length F of the guide surface (83) on the guide rib (82) Ｒ is the guide length F between the sleeve (54) of the base housing (44) and the guide portion (66) of the closure body (65) facing the base housing (44). Ｌ 18. The check valve according to claim 17, characterized in that it is shorter than

19. 19. The check valve according to claim 1, wherein the sealing element (81) is arranged downstream of the closing surface (108) of the closing body (85), and the closing force of the force accumulation element (71) is transmitted to the valve seat (75) via the closing surface (108) of the closing body (85), and / or the sealing element (81) only abuts the valve seat (75) in a sealing manner.

20. 20. A check valve according to any one of claims 1 to 19, characterized in that at least one guide element (53) is provided on the valve closing member (61), in particular aligned in the opposite direction to the closing body (65), by means of which the valve closing element (61) is displaceably guided within the base housing (44), preferably during the entire actuation stroke of the valve closing member (61) between the actuation position (63) and the start position (62) within the base housing (44).

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