CN-121986230-A - Flow path switching system

CN121986230ACN 121986230 ACN121986230 ACN 121986230ACN-121986230-A

Abstract

A flow path switching system includes a flow path switching valve unit that supplies a fluid to the flow path switching valve unit, and a pump that includes an inlet flow path that introduces the fluid supplied by the pump, a first outlet flow path and a second outlet flow path that branch from the inlet flow path and lead out the fluid, a movable wall chamber, a movable wall disposed in the movable wall chamber, a drive shaft connected to the movable wall, and a valve body provided in the drive shaft, wherein the drive shaft is driven by operating the movable wall, and the flow path is switched by opening and closing the first outlet flow path and the second outlet flow path by the valve body, and the flow path switching system includes a first communication path that communicates the movable wall chamber with an upstream side flow path of the pump, a second communication path that communicates the movable wall chamber with a downstream side flow path of the pump, and a communication state switching valve that switches a state of the first communication path and the second communication path.

Inventors

KOBAYASHI
WATANABE HARUKA

Assignees

爱三工业株式会社

Dates

Publication Date: 20260505
Application Date: 20240909
Priority Date: 20231020

Claims (7)

1. A flow path switching system, comprising: Flow path switching valve unit, and A pump for supplying a fluid to the flow path switching valve unit, The flow path switching valve unit includes an introduction flow path for introducing the fluid fed by the pump, a first discharge flow path and a second discharge flow path branched from the introduction flow path and discharging the fluid, a movable wall chamber, a movable wall disposed in the movable wall chamber, a drive shaft connected to the movable wall, and a valve body provided to the drive shaft, and the drive shaft is driven by operating the movable wall, so that the first discharge flow path and the second discharge flow path are opened and closed by the valve body to switch the flow paths, It is characterized in that the method comprises the steps of, The flow path switching system includes: A first communication passage that communicates the movable wall chamber with an upstream-side flow path of the pump; A second communication passage for communicating the movable wall chamber with a downstream side flow path of the pump, and And a communication state switching valve that switches a communication state of the first communication path and the second communication path.
2. The flow path switching system according to claim 1, wherein, The movable wall chamber includes a back pressure chamber partitioned by the movable wall, The communication state switching valve is switched between a state in which the back pressure chamber communicates with an upstream-side flow path of the pump by the first communication path and a state in which the back pressure chamber communicates with a downstream-side flow path of the pump by the second communication path.
3. The flow path switching system according to claim 1, wherein, The movable wall chamber includes a back pressure chamber and an intermediate chamber partitioned from the back pressure chamber by the movable wall, The first communication passage is a passage that communicates the back pressure chamber with an upstream-side passage of the pump, The second communication passage is a passage that communicates the intermediate chamber with a downstream side flow path of the pump, An intermediate passage is provided as a passage that communicates the first communication passage with the second communication passage, The communication state switching valve is switched to either one of a state in which both the back pressure chamber and the intermediate chamber are communicated with an upstream side flow path of the pump by communicating the first communication path with the second communication path via the intermediate path, and a state in which the back pressure chamber is communicated with the upstream side flow path of the pump by the first communication path and the intermediate chamber is communicated with a downstream side flow path of the pump by the second communication path.
4. The flow path switching system according to claim 1, wherein, The movable wall chamber includes a back pressure chamber and an intermediate chamber partitioned from the back pressure chamber by the movable wall, The first communication passage is a passage that communicates the back pressure chamber with an upstream-side passage of the pump, The second communication passage is a passage that communicates the intermediate chamber with a downstream side flow path of the pump, An intermediate passage is provided as a passage that communicates the first communication passage with the second communication passage, The communication state switching valve is switched to either one of a state in which the first communication passage communicates with the second communication passage via the intermediate passage to communicate both the back pressure chamber and the intermediate chamber with the upstream side passage of the pump and the downstream side passage of the pump, and a state in which the back pressure chamber communicates with the upstream side passage of the pump by the first communication passage and the intermediate chamber communicates with the downstream side passage of the pump by the second communication passage.
5. The flow path switching system according to any one of claims 1 to 4, wherein, The movable wall is a diaphragm.
6. The flow path switching system according to any one of claims 1 to 4, wherein, The flow path switching system is a flow path switching device in which the flow path switching valve portion is integrally formed with the pump.
7. The flow path switching system according to any one of claims 1 to 4, wherein, The flow path switching system is mounted in a flow path of cooling water of an electric vehicle.

Description

Flow path switching system Technical Field The present disclosure relates to a flow path switching system that switches a flow path of a fluid (e.g., cooling water). Background Patent document 1 discloses a flow path structure in which a fluid (heat medium) fed by a pump is supplied to a heater core while being controlled by a main valve. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2017-82950 Disclosure of Invention Problems to be solved by the invention In patent document 1, there is no disclosure about pump efficiency (i.e., a ratio of output to input of a pump) of the pump. Assuming that the main valve is a three-way valve that switches two flow paths, pump efficiency may be reduced according to the switched flow paths. Accordingly, the present disclosure has been made to solve the above-described problems, and an object thereof is to provide a flow path switching system capable of switching flow paths by using the front-rear pressure of a pump while suppressing a decrease in pump efficiency. Solution for solving the problem In order to solve the above problems, one aspect of the present disclosure is a flow path switching system including a flow path switching valve unit to which a fluid is supplied, and a pump to which the fluid supplied by the pump is supplied, the flow path switching valve unit including an inlet flow path to which the fluid is supplied, a first outlet flow path and a second outlet flow path to which the fluid is branched from the inlet flow path and led out, a movable wall chamber, a movable wall disposed in the movable wall chamber, a drive shaft connected to the movable wall, and a valve body provided in the drive shaft, the drive shaft being driven by operating the movable wall, the flow path switching system including a first communication path to communicate the movable wall chamber with an upstream side flow path of the pump, a second communication path to communicate the movable wall chamber with a downstream side flow path of the pump, and a first communication path switching valve to switch the flow paths. According to this aspect, the communication state of the first communication passage and the second communication passage (that is, the communication state between the movable wall chamber and the upstream side flow path and the downstream side flow path of the pump by the first communication passage and the second communication passage) is switched by the communication state switching valve, so that the movable wall can be operated freely by the front-rear pressure of the pump (that is, the pressures on the upstream side and the downstream side). Further, the movable wall is moved by the front-rear pressure of the pump to drive the drive shaft, so that the first delivery flow path and the second delivery flow path can be opened and closed by the valve element, and the flow paths can be switched. In this case, the front-rear pressure of the pump can be transmitted to the movable wall chamber in a state where the first communication passage and the second communication passage do not have the fluid flowing. Therefore, a decrease in pump efficiency of the pump that delivers fluid to the flow path switching valve unit can be suppressed. Therefore, the flow path can be switched by the front-back pressure of the pump while suppressing the decrease in pump efficiency. In the above aspect, it is preferable that the movable wall chamber includes a back pressure chamber partitioned by the movable wall, and the communication state switching valve is switched between either a state in which the back pressure chamber is communicated with an upstream side flow path of the pump by the first communication path and a state in which the back pressure chamber is communicated with a downstream side flow path of the pump by the second communication path. According to this aspect, the flow path can be switched by the front-back pressure of the pump with a simple structure. Therefore, the manufacturing cost of the flow path switching system can be suppressed. In the above-described aspect, it is preferable that the movable wall chamber includes a back pressure chamber and an intermediate chamber that is partitioned from the back pressure chamber by the movable wall, the first communication passage is a passage that communicates the back pressure chamber with an upstream side passage of the pump, the second communication passage is a passage that communicates the intermediate chamber with a downstream side passage of the pump, an intermediate passage is provided as a passage that communicates the first communication passage with the second communication passage, and the communication state switching valve is switched to any one of a state in which both the back pressure chamber and the intermediate chamber communicate with the upstream side passage of the pump via the intermediate passage and a state in which the intermediate chamber commun