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 in particular to a check valve for a cooling circuit or a thermal circuit. [Background technology]

[0002] International Publication No. 2019 / 219732(A1) discloses a check valve for a cooling or thermal circuit that can be inserted into an inlet opening of a connecting device or pipe. The check valve comprises a housing that is either a single unit or a multi-part housing with at least one base housing, the supply port being located on the inlet side of the base housing and the discharge port being located on the outlet side of the base housing, and the supply port and discharge port being connected to each other by a flow path.

[0003] The base housing includes at least one guide element that guides the valve closing element to move from an initial or closed position to an operating or open position. A force storage element acts in the opposite direction to the opening movement of the valve closing element. The base housing, guide element, and force storage element acting on the valve closing element are located downstream of the valve seat where the closing surface of the closing body of the valve closing member is stationary in the initial position. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2019 / 219732(A1) [Overview of the project] [Problems that the invention aims to solve]

[0005] The present invention is based on the problem of forming a check valve that can reduce pressure loss in a medium flowing through it. [Means for solving the problem]

[0006] This problem is solved by a valve closing member comprising a closing body having a closing surface downstream of the closing surface of the closing body, preferably an adjacent closing surface, and a check valve with a sealing element that abuts against the valve seat in an initial position to close the flow path, wherein the closing body extends into the operating position in the opposite direction to the movement of the closing body from the closing surface, and the closing body Concave The free end face connected to the closed surface of the closed body by the contour Convex It has a shaped contour. This shape of the closure body, which extends in the opposite direction to the direction of the flow of the medium starting from the valve seat or the closure surface that is stationary at the valve seat, allows for flow optimization. In particular, this can reduce turbulence in the medium, especially when flowing toward the valve seat. Pressure loss can be reduced by increasing the laminar portion of the flow in the medium flowing through the open check valve. In particular, for check valves used on the low-pressure side of cooling or thermal circuits, reducing pressure loss can lead to improved efficiency. This can have a favorable effect on, for example, heat dissipation, and as a result, heat dissipation may increase.

[0007] It starts from the front end of the closed body. Convex Shape contour and, Concave It is preferable to form a flowing transition between the closed surfaces of the closed bodies connected via a contoured shape. Advantageously, a gentle slope is provided to achieve a smooth flow region.

[0008] Furthermore, at the free end face of the closed body Convex Shape contour Concave Direct fusion with the contour, and Concave It is preferable that the concave contours fuse directly to the closed surface. This means that no straight sections are formed at all. Direct transitions between contours, and direct transitions from concave contours to closed surfaces, can further optimize the flow.

[0009] The length L of the closure body from the closing surface 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. This means that the closure body is positioned toward or within the inlet opening independently of the opening stroke of the closure body, and that the closure body works to facilitate flow in a way that particularly reduces pressure loss.

[0010] Preferably, the length F of the guide surface on the guide rib. R The guide length F is the distance between the sleeve of the base housing and the guide portion of the closing body facing the base housing. L It is shorter than this. This means that the closure can be guided between the guide rib and the valve seat or inlet opening in the first stroke, and the closure can be guided on the base housing in the second stroke. This allows the closure to be guided throughout the entire opening stroke of the valve closing element. In addition, the passage can be completely opened at the valve seat.

[0011] Formed at the front end of the closed body Convex The contour may be hemispherical or have a parabolic cross-section. Away from the front end of the closure, the hemispherical or parabolic contour may have an equatorial plane with a radius R1 smaller than the cross-sectional portion of the closure surface. This radius R1 may be an optimization variable for reducing pressure loss.

[0012] Convex The closure body extends between the contour and the closing surface of the closure body. Concave The contour preferably has a radius R2. This allows for continuous transitions. Alternatively, it may be formed by changing the slope or radius instead of radius R2. Concave A curved contour can be provided. In detail, the slope increases in the transition direction toward the closing surface of the closing element, or the radius becomes smaller. As a result, the closing body widens from the front end of the closing body toward the closing surface.

[0013] According to other advantageous embodiments, Concave The radius R2 of the contour is Convex It is specified that the radius of the contour must be greater than R1.

[0014] According to other advantageous embodiments of the closure, the equatorial plane or Convex It may be specified that the radius R1 of the contour is smaller than the radius R3 that determines the cross-sectional area of ​​the closed surface of the closed body.

[0015] To have an advantage, ConvexThe length L of the closed body starting from the closed surface and reaching the free end face of the closed body with respect to the radius R1 of the shape contour may be defined to be in the range of 0.25 times to 5 times. With such a geometric shape, further reduction of pressure loss can be achieved.

[0016] Preferably, the free end face of the closed body extends upstream beyond the valve seat after the valve closing member takes the operating position. Preferably, the end of the closed body protrudes into the inlet opening adjacent to the valve seat when the valve closing member is in the operating position.

[0017] Moreover, an advantageous design of the closed body can be provided by the ratio of the cross-sectional part of the closed surface to the length of the closed body starting from the closed surface and reaching the end face of the closed body in the range of 3 to 0.3.

[0018] In another preferred embodiment, it is defined that the guide rib extends from the closed surface of the closed body in the direction of the free end face of the closed body or to the free end face of the closed body. Thereby, even during the opening stroke, the guide rib can guide the closed body extending in the direction opposite to the flow direction centrally with respect to the valve seat. As a result, uniform flow conditions can be maintained regardless of the scale of the opening stroke.

[0019] Specifically, preferably, two or more guide ribs aligned at the same circumferential angle with respect to each other are provided on the closed body of the valve closing element. For example, a star-shaped arrangement or an arrangement in which the guide ribs take the form of a mathematical plus sign may be provided on the closed body.

[0020] The guide ribs on the closed body preferably have guide surfaces that extend from the closed surface of the closed body in the direction of the free end face of the closed body and are aligned parallel to each other. Specifically, it provides guiding the guide surfaces of the guide ribs along the inner wall of the inlet opening or in the transition part between the valve seat surface of the valve seat and the inner wall of the inlet opening.

[0021] An inflow surface can be formed between the guide surface of the guide rib and the free end face of the closed body. This inflow surface may be linear, rounded, or even curved. When the inflow surface is linear, it preferably inclines at an angle of less than 60° with respect to the longitudinal axis of the valve closing element.

[0022] The guide surface of the guide rib is preferably at least from the closing surface of the closing body. Convex It extends to the equatorial plane of the contour.

[0023] Furthermore, preferably, 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 stipulated that it must have [a certain characteristic].

[0024] Instead, the guide surface of the guide rib has a length F greater than the maximum movement of the closing body from the starting position to the operating position. R This can provide a guide that is oriented in the direction of flow within the inlet opening of the valve housing at the end face of the closing body.

[0025] Furthermore, preferably, more specifically, at least one guide element is provided on the valve closing member, aligned in the opposite direction to the closing body of the valve closing member, thereby guiding the valve closing member so that it can be displaced within the base housing, preferably between the operating position and the starting position, during the entire operating stroke of the valve closing member. This allows the at least one guide element to continuously guide the valve closing member to the base housing while opening or closing the valve closing member.

[0026] A preferred embodiment of the check valve provides that guide ribs guide the valve closing member within the inlet opening from the starting position to an intermediate position toward the operating position in the first stroke phase, and preferably from the intermediate position toward the operating position in the second stroke phase, and then release the guide ribs from the inlet opening to guide the valve closing member within the base housing, more specifically within the sleeve of the base housing, by the guide portion of the closing body. This allows the valve closing member to be guided twice during the entire opening stroke or the entire operating stroke. Since the guide ribs no longer guide within the inlet opening during the second stroke phase from the intermediate position toward the operating position, the free flow rate can be increased.

[0027] Preferably, the length F of the guide surface on the guide rib. R The guide length F is the distance between the sleeve of the base housing and the guide portion of the closing body facing the base housing. L It is shorter than that. This allows the closure element to be guided throughout the entire opening stroke of the valve closure element.

[0028] The present invention, as well as other advantageous and other embodiments of the present invention, will be described and explained in more detail below with reference to the examples shown in the drawings. Features derived from this specification and the drawings can be used individually or in any combination in accordance with the present invention. [Brief explanation of the drawing]

[0029] [Figure 1] This is a schematic diagram of the cooling circuit. [Figure 2] This is a schematic cross-sectional view of a connecting device with a check valve. [Figure 3] This is a perspective view of a first embodiment of a check valve. [Figure 4] Figure 3 is a schematic cross-sectional view of a check valve. [Figure 5] This is a schematic cross-sectional view of the check valve in its installed state, as shown in Figure 3. [Figure 6] This is a schematic cross-sectional view of an alternative embodiment of the check valve shown in Figure 3, in an installed state. [Figure 7] This is a schematic cross-sectional view of a check valve with a valve housing in another installed state, as shown in Figure 3. [Figure 8] This is a perspective view of an alternative embodiment of the check valve relative to Figure 3. [Figure 9] This is a schematic cross-sectional view of the check valve in its initial position, as shown in Figure 8. [Figure 10] This is a schematic cross-sectional view of the check valve in the operating position, as shown in Figure 8. [Modes for carrying out the invention]

[0030] Figure 1 shows a conventional design of a cooling or heat circuit 11, preferably used in an automobile, more specifically an air conditioning system. A compressor 12 compresses a refrigerant. This refrigerant may be, for example, R134a, R1234yf, or CO2. The compressed refrigerant is supplied 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 gaseous and liquid phases of the refrigerant and simultaneously collect the liquid refrigerant. The refrigerant exiting 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 a heat exchanger 16. The expansion valve 15 adjusts the mass flow of the cooling or heat circuit 11 according to the pressure difference. The high-pressure refrigerant expands in the expansion valve 15 and reaches the heat exchanger 16 on the low-pressure side. The refrigerant absorbs heat from the environment from the heat exchanger 16. From there, the refrigerant returns to the condenser 12 via the internal heat exchanger 14.

[0031] In such a cooling circuit, when using the connecting equipment 21 shown in Figure 2 and described below, the design of the cooling circuit 11 shown in Figure 2 deviates from the norm in that the expansion valve 15 is integrated into, for example, the connecting block 22, rather than being separately arranged in the pipe section between the internal heat exchanger 14 and the heat exchanger 16.

[0032] The connecting device 21, as shown in Figure 2, includes an inlet opening 26 of a first through-hole 24 that connects to an outlet opening 27 via a throttling point 31. This outlet opening 27 is connected to the inlet of the heat exchanger 16. Adjacent to this outlet opening 27, a second through-hole 25 is provided in the connecting device 21. An inlet opening 28 connected to the outlet of the heat exchanger 16 receives the refrigerant arriving from the heat exchanger 14 and supplies the refrigerant to the 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 hole 33. The end portion of the internal heat exchanger 14 can be inserted into this common connecting hole 33. The internal heat exchanger 14 has an outer tube 36, the outer circumference of which presses against the hole portion 35 of the connecting hole 33 and extends at least partially into the connecting hole 33. The annular collar 37, flange, or other connection point is preferably located inside the outer tube 36, which is positioned in contact with 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 near or to the throttling point 31 without covering it. The inner tube 39 of the internal heat exchanger 14 protrudes from the outer tube 36 and is preferably positioned in contact with an end face 40 formed in a transition region 34 between the outlet opening 29 and the hole portion 35. In such an arrangement, the inlet opening 26 of the first through hole 24 is formed by an annular waterway between the inner tube 39 and the hole portion 35 of the connecting hole 33.

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

[0035] The check valve 41 can be inserted into the outlet opening 29 of the second through hole 25 of the connecting block 22. Alternatively, the check valve 41 can also be inserted into one end of the inner tube 39 of the internal heat exchanger 14. In either case, the check valve 41 is positioned adjacent to or adjacent to the end face 40. This does not further form an interface. The check valve 41 can also be used in other circuits to ensure unidirectional flow of the medium. In particular, the check valve 41 can be used on the low-pressure side and / or suction side.

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

[0037] Figure 4 is a schematic cross-sectional view of a check valve as shown in Figure 3.

[0038] The check valve 41 comprises an annular base housing 44. A guide element 53 is provided in the central portion of the base housing 44. This guide element 53 is housed, for example, by at least one longitudinal rib 56, preferably three longitudinal ribs 56. This guide element 53 may include a sleeve 54, as shown in the cross-sectional view in Figure 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, connected to one another. These openings 57 are aligned, for example, in a star shape. Preferably, the openings 57 extend longitudinally with respect to the longitudinal ribs 56.

[0039] The base housing 44 may have an outer circumferential shoulder portion 95 that generates a projection facing radially outward. This outer circumferential shoulder portion 95 can serve as a stop portion for clearly mounting, for example, the check valve 41. The base housing 44 may also have a connecting portion 85. Using this connecting portion 85, the valve housing 43 can be attached to the base housing 44 using a connecting portion 84 arranged on top of it. This arrangement of the valve housing 43 on the base housing 44 is shown, for example, in Figure 7.

[0040] The cross-sectional view in Figure 4 shows that at least one guide rod 59 extends inside the valve closing member 61. This guide rod 59 extends from the closing member 65 toward 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 rod 59 has cross-sectional dimensions such that it is guided within the opening 57. Advantageously, the three guide rods 59 are aligned in a star shape. To connect the valve closing member 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 opening 57. The guide rods 59 then return to their starting positions. A force storage element 71 acting between the base housing 44 and the valve closing member 61 positions the valve closing member 61 in its initial position 62 relative to the base housing 44. The displacement of the valve closing member 61 relative to the base housing 44 is restricted 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 restricts its displacement.

[0041] At this starting position 62, a preload can be applied to the force storage element 71 between the base housing 44 and the valve closing element 61. This allows the opening force of the valve closing element 61 to be adjusted. A faster closing motion from the operating 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 on which the sealing element 81 is arranged.

[0043] The closing body 65 of the valve closing element 61 can extend asymmetrically in the portion between the sealing element 81 and the base housing 44. For example, a unilateral smoothing 96 can be provided opposite the curved path 97. The curved path 97 of the closing body 65 may have an optimized flow path. The unilateral smoothing 96 can achieve increased flow rate.

[0044] At least one guide rod 59 can provide additional guidance to the internal force storage element 71. The force storage element 71 is preferably located inside the sleeve 54 and the guide portion of the guide element.

[0045] The closing body 65 of the valve closing member 61 extends from the sealing element 81 in the direction opposite to the base housing 44. This closing body 65 is at the free end face end 101. Convex It has a shaped contour 102. Convex Starting from the contour 102 and in the direction of the sealing element 81, Convex The contour 102 fuses with the closing surface 108 of the closed body 65. Concave The closing surface 108 is adjacent to the contour 105. This closing surface 108 is directly adjacent to the sealing element 81 or the recess 79 in the closing body 65. The closing surface 108 can be formed in a flat or linear contact portion within the valve seat 75. Convex The contour 102 can be formed in a semicircular shape and ends at a virtual equatorial plane 103 far from the free end face 101. In the case of a semicircular contour, the equatorial plane 103 is Convex This corresponds to twice the radius R1 that determines the curvature of contour 102. Instead, Convex It may be provided that the contour 102 is formed by a parabola that, when viewed in cross-section, also terminates at the equatorial plane 103. Starting from just beyond this equatorial plane 103, Concave The contour 105 extends in the direction of the closing surface 108 of the closing body 65. Concave The contour 105 may have a constant curvature with radius R2. Concave The contour 105 can also be formed by increasing its inclination in the direction of the closed surface 108.

[0046] Adjacent to the sealing element 81, the closing surface 108 includes a cross section 109 with a radius R3. This cross section 109 corresponds to the cross section for the through-opening 24 within the valve seat 75, which causes the valve closing member 61 to rest in its initial position and close the through-opening 24.

[0047] Figure 5 shows a schematic diagram of the check valve 41 according to Figures 3 and 4 in the first installed state. This embodiment shows a connection opening for a connecting device 21 or pipe 39. The connection opening may be a discharge opening and / or an inlet opening 26, 27, 28, 29. The check valve 41 closes the through opening 24 in a unidirectional flow.

[0048] The base housing 44 presses against the stepped portion of the connection opening of the connecting device 21, which has shoulder portions 95. As a result, the check valve 41 takes a defined position inside 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 receives a compressive force between the valve closing member 61 and the base housing 44, preferably corresponding to the closing force of the valve closing member 61. The valve seat 75 is formed by the constriction within the through opening 24. The seal 81 of the closing body 65 and the valve closing element 61 press against this valve seat 75. In the starting position 62 of the check valve 41 shown in Figure 5, the through opening 24 is closed.

[0049] By changing the distance between the valve seat 75 and the base housing 44 of the check valve 11 within the connection opening of the connecting device 21, the preload of the energy storage element 71 and, consequently, the opening time 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 operating position 63. As a result, the closing body 65 of the valve closing member 61 is lifted away from the valve seat 75, and the medium can flow toward the base housing 44. For example, the medium passes through at least one flow path 49 through the discharge port 51.

[0051] The closure body 65 is stationary, and the closing surface 108 of the closure body 65 is in its 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 the direction opposite to the direction of flow.

[0052] For example, the closure body 65 may have a radius R1 with respect to the equatorial plane 103 that is smaller than the radius R3 of the cross-sectional portion where the closure surface 108 is located. Preferably, R1 is smaller than 0.5R3 or 0.25R3. Moreover, preferably, Convex the radius R1 with respect to the annular contour 102 Concave may be defined to be smaller than the radius R2 of the annular contour 105. Moreover, preferably, the distance L starting from the sealing element 81 or the closure surface 108 and reaching the free end face end of the closure body 101 may be defined to be in the range of 0.5 times to 5 times the radius R1. Preferably, it is defined that the length L is longer than the opening stroke of the valve closure member into the operating position 63 from the starting position 62. Moreover, the ratio of the radius R3 of the cross-sectional portion of the closure surface 108 to the length L from the closure surface 108 to the end face end 101 of the closure member 65 may be defined to be 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 according to FIG. 5. This embodiment of the check valve 41 corresponds to the check valve of FIGS. 3 to 5. In addition, 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 in the direction from the closure surface 108 to the free end face end 101 of the closure body 65. Advantageously, two or more guide ribs 82 are provided. These guide ribs 82 preferably have guide surfaces 83 that are aligned parallel to each other. The guide surface 83 is coaxially aligned with respect to the longitudinal axis of the valve closure member 61 or with respect to the movement of the valve closure member 61 in its stroke. The guide surface 83 starts from one end of the guide surface 83 Concave and may have an inflow surface 111 that merges with the annular contour 105 or Convex the annular contour 102. The inflow surface 111 may also Convex merge directly with the end face 101 of the annular 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 body 65 LIt is shorter than that. Furthermore, it may be specified that the guide surface 83 of the guide rib 82 has an outer circumference corresponding to the inner diameter of the through opening 24.

[0055] Figure 7 shows a schematic cross-sectional view of the check valve 41 according to Figures 3 to 5, further comprising a valve housing 43. The valve housing 43 comprises a connecting portion 84 that engages with a connecting portion 85. Preferably, the connecting portion 85 is provided on the outside surrounding the connecting portion 84. Alternatively, a swapped arrangement can also be provided. This connecting interface 46 may comprise a plug-in connection, a latching connection, a snap connection, a pressure connection, or a screw connection. This connection may be removable or non-removable.

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

[0057] Starting from the base housing 44, the valve housing 43 may have an inner wall portion whose cross-section is continuously tapered to form a narrowed section, preferably up to the valve seat 75. The inner cross-section of the valve housing 43 then gradually widens again.

[0058] A recessed container for other sealing elements 89 is provided on the outer circumference of the valve housing 43 to seal the connection point within the connecting device 21.

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

[0060] The operating modes of this check valve 41 correspond to the check valves in Figures 3 to 5. As in the embodiment shown in Figure 6, the check valve 41 shown in Figure 7 may also have guide ribs 82 with guide surfaces 83.

[0061] Figures 8 to 10 show alternative embodiments of the check valve 41 compared to the embodiment described above.

[0062] This embodiment of the check valve 41 shown in Figures 8 to 10 comprises a base housing 44 for receiving a valve closing member 61 with a guide rod 59 guided within at least one guide element 53, as shown in Figures 3 to 5. Furthermore, the check valve 41 may include a valve housing 43 that can be connected to the base housing 44 by 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 that of the embodiment shown in Figures 3 to 5. However, the shape of the closing body 65, starting from the closing surface 108 and extending to the free end surface 101, corresponds to the embodiment described above. Furthermore, a sealing element 81 is provided on top of 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. The valve seat 75 preferably takes the shape of a cone that widens in the direction of flow from the inlet openings 26, 28 to the outlet openings 27, 29. This enlarges the cross-section of the flow path 49. This has the advantage that as the cross-sectional area increases, the flow velocity of the medium decreases, thereby reducing the flow pressure loss.

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

[0065] Guide ribs 82 are provided on the closure body 65, facing toward the inlet openings 26 and 28. The closure body 65 and the guide ribs 82 arranged thereon with guide surfaces 83 advantageously correspond to the embodiment shown in Figure 6. During the movement of the valve closure member 61 from the starting position 62 to the operating position 63, the guide surfaces 83 of the guide ribs 82 can be guided over the valve seat 75 or over the through-opening 24 of the valve housing 43. This provides axial guidance for the valve closure member 61. The guide surfaces 83 of the guide ribs 82 can also be shortened, and as a result provide guidance only until they guide the guide portion 66 of the closure member 65 through the sleeve 54. Thus, the guidance by the guide ribs 82 acts only up to the intermediate position during the initial opening stage of the valve closure member relative to the valve seat. During the other movement paths or opening strokes from the intermediate position to the operating position 63, the 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 throughout the entire stroke path or during the movement between the operating position 63 and the starting position 62. The same applies to the movement of the valve closing member 61 from the operating position 63 to the starting 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 closing 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 closing body 65 moves away from the valve seat 75 during the transition from the first opening phase to the second opening phase of the valve closing member 61, the guide portion 66 and the sleeve 54 engage with each other, forming an axial guide for the valve closing member 61. In the operating position of the valve closing member 61 as shown in Figure 10, the guide portion 66 and the sleeve 54 engage with each other so that the energy storage element 71 is completely enclosed. The flow path 49 extends outside the valve closing member 61, the guide portion 66, and the sleeve 54, and as a result, the flow medium does not come into contact with the energy storage element 71.

[0067] The guide ribs 82 provided on the closed body 65 also act as so-called flow straighteners, which have the advantage of being able to calm the flow of the medium and thereby reduce the loss of flow pressure.

Claims

1. A check valve for a cooling circuit or thermal circuit, which can be inserted into a connection opening (26, 27, 28, 29) of a connecting device (21) or pipe (39), - A housing (42) consisting of an integral or multiple parts, comprising at least one base housing (44), wherein a supply port (48) is provided on the inlet side of the base housing (44), and a discharge port (51) is provided on the outlet side of the base housing (44), and the supply port (48) and the discharge port (51) are connected to each other by a flow path (49) of the housing (42), - A guide element (53) provided on the base housing (44) to guide the valve closing member (61) so that it can be displaced, wherein the valve closing member (61) is positioned at a starting position (62) by a force storage element (71), and the guide element (53) can be displaced in the direction of the discharge port (51) within the operating position (63) against the force of the force storage element (71), - A closing body (65) arranged on the valve closing member (61), having a closing surface (108) that abuts against the valve seat (75) of the connecting device (21) or the pipe (39) or the valve housing (43) of the housing (42) at the starting position (62) of the valve closing member (61) and closes the through opening (24), - A sealing element (81) arranged adjacent to the closing body (65) that presses against the valve seat (75) and Equipped with - The force storage element (71) acting on the base housing (44), the guide element (53), and the valve closing member (61) is provided downstream of the valve seat (75). In a check valve, - The closing body (65) extends from the closing surface (108) in the opposite direction to the movement of the valve closing member (61) from the starting position (62) to the operating position (63), and - The closing body (65) has a convex contour (102) at its free end face (101) that is connected to the closing surface (108) by a concave contour (105). - The guide rib (82) extends from the closing surface (108) of the closing body (65) towards the free end face (101) of the closing body (65), or to the free end face (101) of the closing body. - The length L of the closing body (65), starting from the closing surface (108) and ending at the free end face (101) of the closing body (65), is longer than the movement of the valve closing member (61) from the starting position (62) to the operating position (63). - The ratio of the radius R3 of the cross-sectional portion (109) of the closing surface (108) to the length L of the closing body (65) starting from the closing surface (108) and extending to the free end face portion (101) of the closing body (65) is in the range of 3 to 0.

3. A check valve characterized by the following.

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

3. The check valve according to claim 1, characterized in that the convex contour (102) fuses directly with the concave contour (105), and the concave contour (105) fuses directly with the closing surface (108) of the closing body (65).

4. The closing body (65) is formed in a hemispherical shape, or with a parabolic cross-section at the free end face (101) of the closing body (65), and the radius R of the cross-sectional portion (109) of the closing surface (108) ３ A radius smaller than R １ The check valve according to claim 1, characterized in that the equatorial plane (103) is formed far away from the free end face (101) by the convex contour (102).

5. The concave contour (105) between the convex contour (102) and the closed surface (108) has a radius R ２ The check valve according to claim 4, characterized in that it is formed by, or by a curve whose inclination changes or whose radius changes.

6. The radius R of the concave contour (105) ２ The radius R of the convex contour (102) １ The check valve according to claim 5, characterized in that it is larger than [a certain value].

7. The length L of the closing body (65), starting from the closing surface (108) and ending at the free end face end (101) of the closing body (65), is equal to the radius R of the equatorial plane (103). １ The check valve according to claim 4, characterized in that it is in the range of 0.25 to 5 times.

8. The check valve according to claim 1, characterized in that the free end face portion (101) of the closing body (65) extends upstream beyond the valve seat (75) after the valve closing member (61) has taken the operating position (63), and the free end face portion (101) of the closing body (65) in the operating position (63) of the valve closing member (61) protrudes into the connecting opening (26) adjacent to the valve seat (75).

9. The check valve according to claim 1, characterized in that two or more guide ribs (82) arranged at the same outer circumference angle to each other are provided on the closing body (65).

10. The check valve according to claim 1, wherein the guide rib (82) has a guide surface (83), the guide surface (83) starting from the closing surface (108) of the closing body (65) and extending toward the free end face end (101) of the closing body (65), aligned parallel to each other, and guided along the inner wall (74) of the connecting opening (28), or within the transition region between the valve seat surface (76) of the valve seat (75) and the inner wall (74) of the connecting opening (26).

11. The check valve according to claim 10, characterized in that a straight, curved, or rounded inlet surface (111) is formed between the guide surface (83) of the guide rib (82) and the free end surface (101) of the closing body (65).

12. The check valve according to claim 10, 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).

13. The guide surface (83) of the guide rib (82) has a length F shorter than the maximum movement of the closing body (65) from the starting position (62) to the operating position (63). Ｒ A check valve according to claim 10, characterized by having the following features.

14. The guide surface (83) of the guide rib (82) has a length F greater than or equal to the maximum movement of the closing body (65) from the starting position (62) to the operating position (63). Ｒ A check valve according to claim 10, characterized by having the following features.

15. The check valve according to claim 1, characterized in that the valve closing member (61) is guided by the guide rib (82) in the connection opening (26) from the starting position (62) to an intermediate position in the direction of the operating position (63) in the first stroke stage, and from the intermediate position to the operating position (63) where the guide rib (82) is free from the connection opening (26) in the second stroke stage, and is guided by the guide portion (66) of the closing body (65) and the guide portion (66) of the base housing (44).

16. 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 closing body (65) facing the base housing (44). Ｌ The check valve according to claim 10, characterized in that it is shorter than that.

17. The check valve according to claim 1, characterized in that the sealing element (81) is arranged downstream of the closing surface (108) of the closing body (65), the closing force of the force storage element (71) is transmitted to the valve seat (75) via the closing surface (108) of the closing body (65), and / or the sealing element (81) simply contacts the valve seat (75) in a sealing manner.

18. The check valve according to claim 1, characterized in that at least one guide element (53) is provided on the valve closing member (61) and is aligned in the opposite direction to the closing body (65), and the guide element (53) is used to guide the valve closing member (61) so that it can be displaced within the base housing (44).

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