BYPASS VALVE, EXPANDER UNIT HAVING A BYPASS VALVE, AND WASTE-HEAT RECOVERY SYSTEM HAVING AN EXPANDER UNIT

• US 20190316691A1
• Filed: 10/04/2017
• Published: 10/17/2019
• Est. Priority Date: 11/24/2016
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Eisenmenger, Nadja
• Application Number:
  US16/463,637
• Publication Number:
  US 20190316691A1
• Time in Patent Office: Days
• CPC Class Codes: F16K 1/123 with stationary valve member and moving sleeve
• CPC Class Codes: F16K 11/02 with all movable sealing faces moving as one unit
• CPC Class Codes: F16K 11/044 with movable valve members positioned between valve seats
• CPC Class Codes: F16K 11/07 with cylindrical slides
• CPC Class Codes: F16K 11/0716 with fluid passages through the valve member F16K11/0704, F16K11/0708, F16K11/0712 take precedence
• CPC Class Codes: F16K 31/0603 Multiple-way valves
• CPC Class Codes: F16K 39/024 using an auxiliary valve on the main valve
• CPC Class Codes: F28D 15/0266 with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers F28D15/043 takes precedence
• CPC Class Codes: F28D 15/06 Control arrangements therefor
• CPC Class Codes: F28D 2015/0291 comprising internal rotor means, e.g. turbine driven by the working fluid

Abstract

The invention relates to a bypass valve (1), having a valve housing (4) and a slide (3) arranged for longitudinal movement in the valve housing (4). An inlet channel (5), an outlet channel (6), and a further outlet channel (7) are formed in the valve housing (4). The slide (3) interacts with a valve seat (8) formed in the valve housing (4) by means of the longitudinal movement of the slide and thereby opens and closes a hydraulic connection between the inlet channel (5) and the outlet channel (6). Furthermore, the slide (3) interacts with a further valve seat (8b) formed in the valve housing (4) by means of the longitudinal movement of the slide and thereby opens and closes a further hydraulic connection between the inlet channel (5) and the further outlet channel (7). A control surface (3c) is formed on the slide (3), wherein the control surface (3c) delimits a control chamber (34). The pressure in the control chamber can be hydraulically controlled by means of a pilot valve (2).

Claims

1. A bypass valve (1) comprising a valve housing (4) and a slide (3) longitudinally movable in the valve housing (4), wherein an inlet channel (5), an outlet channel (6) and a further outlet channel (7) are formed in the valve housing (4), wherein the slide (3) cooperates through longitudinal movement with a valve seat (8) formed in the valve housing (4) and thereby opens and closes a hydraulic connection between the inlet channel (5) and the outlet channel (6), wherein the slide (3) furthermore cooperates through longitudinal movement with a further valve seat (8b) formed in the valve housing (4) and thereby opens and closes a further hydraulic connection between the inlet channel (5) and the further outlet channel (7), wherein a control surface (3c) is formed on the slide (3), wherein the control surface (3c) delimits a control chamber (34), and wherein the bypass valve further comprises a pilot valve (2) for hydraulically controlling the pressure in the control chamber.

2. The bypass valve (1) as claimed in claim 1, characterized in that the control chamber (34) is hydraulically connected to the inlet channel (5).

3. The bypass valve (1) as claimed in claim 1, characterized in that the pilot valve (2) comprises a valve body (16) and a pilot valve seat (32), wherein the valve body (16) cooperates with the pilot valve seat (32) and thereby opens and closes a hydraulic pilot connection between the inlet channel (5) and the further outlet channel (7).

4. The bypass valve (1) as claimed in claim 3, characterized in that the pilot valve (2) has an actuator (13), wherein the actuator (13) controls a movement of the valve body (16).

5. The bypass valve (1) as claimed in claim 4, characterized in that the pilot valve seat (32) is formed on the slide (3).

6. The bypass valve (1) as claimed in claim 5, characterized in that when the pilot valve (2) is closed, a form-fit connection is formed between the pilot valve seat (32) and the valve body (16) in a direction of a closing movement of the valve body (16).

7. The bypass valve (1) as claimed in claim 6, characterized in that when the pilot valve (2) is closed, the actuator (13) mechanically controls the longitudinal movement of the slide (3) in the direction of the closing movement of the valve body (16).

8. The bypass valve (1) as claimed in claim 7, characterized in that the valve body (16) is formed as a plate, wherein the valve body (16) is formed on a valve needle (15), wherein the closing movement of the valve body (16) is achieved by a traction load on the valve needle (15).

9. The bypass valve (1) as claimed in claim 7, characterized in that the valve body (16) is formed on a valve needle (15), wherein the closing movement of the valve body (16) is achieved by a pressure load on the valve needle (15).

10. The bypass valve (1) as claimed in claim 7, characterized in that the closing movement of the valve body (16) takes place in the same direction as the longitudinal movement of the slide (3) for closing the further hydraulic connection.

11. The bypass valve (1) as claimed in claim 4, characterized in that at a maximal opening stroke (h_PV) of the pilot valve (2), a form-fit connection is formed between the pilot valve (2) and the slide (3) in a direction of an opening movement of the valve body (16).

12. The bypass valve (1) as claimed in claim 11, characterized in that at the maximal opening stroke (h_PV) of the pilot valve (2), the actuator (13) mechanically controls the longitudinal movement of the slide (3) in the direction of the opening movement of the valve body (16).

13. The bypass valve (1) as claimed in claim 12, characterized in that the longitudinal movement of the slide (3) is achieved by a pressing movement of the actuator (13).

14. The bypass valve (1) as claimed in claim 12, characterized in that the longitudinal movement of slide (3) is achieved by a traction movement of the actuator (13).

15. The bypass valve (1) as claimed in claim 11, characterized in that the opening movement of the valve body (16) takes place in the same direction as the longitudinal movement of the slide (3) for opening the further hydraulic connection.

16. An expander unit (10) comprising a bypass valve (1) as claimed in claim 1, an expansion machine (104), and a bypass line (106), wherein the bypass line (106) is arranged parallel to the expansion machine (104), wherein the bypass valve (1) controls a mass flow of working medium to the expansion machine (104) and to the bypass line (106), wherein the bypass line (106) is hydraulically connected to the further outlet channel (7), and wherein the expansion machine (104) is hydraulically connected to the outlet channel (6).

17. A waste-heat recovery system (100) with a circuit (100a) carrying a working medium and including an expander unit (10) as claimed in claim 16, wherein the circuit (100a) comprises, in a flow direction of the working medium, a pump (102), an evaporator (103), the expander unit (10), and a condenser (105), wherein the evaporator (103) is hydraulically connected to the inlet channel (5).

18. The bypass valve (1) as claimed in claim 1, characterized in that the control chamber (34) is hydraulically connected to the inlet channel (5) via a connecting channel (33) formed in the slide (3).

19. The bypass valve (1) as claimed in claim 12, characterized in that the longitudinal movement of the slide (3) is achieved by a pressing movement of the actuator (13), wherein an intermediate piece (28) is arranged between the actuator (13) and the slide (3).

20. The bypass valve (1) as claimed in claim 12, characterized in that the longitudinal movement of slide (3) is achieved by a traction movement of the actuator (13), wherein a connecting piece (35) connected to the slide (3) cooperates with a shoulder (15a) of a valve needle (15) of the pilot valve (2).