48results about How to "Prevent flow back" patented technology

A heat pump system for a vehicle may include an outdoor condenser, an expansion valve, an evaporator, a compressor, and an indoor condenser that primarily condenses the refrigerant compressed through the compressor and is connected with the outdoor condenser, in which the outdoor condenser, the expansion valve, the evaporator, the compressor, and the indoor condenser are connected through refrigerant pipes, a first valve disposed in the refrigerant pipe between the outdoor condenser and the expansion valve; a chiller connected with the first valve through the refrigerant pipe, between the evaporator and the compressor, and controls the temperature of the refrigerant by exchanging heat; a connection pipe selectively allowing some of the refrigerant flowing into the chiller in a dehumidifying mode; and a second valve disposed in the connection pipe.

The invention discloses an overvoltage protection device in a portable device. The device includes an overvoltage detection signal generation unit for detecting an overvoltage of power applied from an external device and outputting an overvoltage detection signal; an overvoltage interruption unit controlled by the overvoltage detection signal of the overvoltage signal generation unit, which determines the whether the applied power should be supplied to the main circuit; and an overvoltage and return current interrupting unit for delivering or interrupting power applied to the main circuit and interrupting current flowing back from the battery according to the determination of the overvoltage interrupting unit.

A device for removing foreign material from a molten metal surface in a steel sheet hot-dip galvanizing process, of the present invention, comprises: a snorkel part of which the end portion is submerged under the molten metal surface of a hot-dip galvanizing bath so as to encompass a steel sheet inserted into the hot-dip galvanizing bath, in order to prevent the oxidization thereof; a snout including a dam unit having a dam forming part which encompasses the steel sheet from the end portion of the snorkel part so as to be spaced a predetermined gap from same, and which allows a molten galvanizing solution inside the hot-dip galvanizing bath to flow over toward the inner peripheral surface of the snorkel part so as to prevent the foreign material that falls onto the molten metal surface inside the snorkel part from attaching to the steel sheet; and a molten zinc discharge unit which is provided inside the snorkel part so as to pump, toward the molten metal surface inside the hot-dip galvanizing bath, the molten galvanizing solution having flowed over the dam forming part of the damp unit, thereby preventing the foreign material included in the molten galvanizing solution, having flowed over the dam forming part, from mixing into the molten galvanizing solution inside the hot-dip galvanizing bath and re-polluting the molten galvanizing solution or flowing into the snorkel part again.

A device (100) and method for adhering by suction to a target surface (200). The device has a substrate (20) with a contact surface (20a) for contacting the device (100) to the target surface (200). A plurality of pocket (10) are formed by respective pocket surfaces (10a) concavely extending into the contact surface (20a). The pockets (10) have an open side (10b) facing and being closed off by the target surface (200). A flexible membrane (15) forms at least part of the pocket surface (10a). An actuator (40) is configured to actuate the flexible membrane (15). A one-way valve (30) through the pocket surface (10a) is configured to direct contents of the pocket (10) via the one-way valve (30) to an environment (300).

The invention discloses an excavator boom energy regeneration device and a boom energy regeneration valve group thereof, and relates to the technical field of excavators. The excavator arm energy regeneration device includes: power oil circuit, pilot oil circuit, loading oil circuit, boom energy regeneration valve group, and oil return circuit. The working speed of the boom, when the pilot pressure reaches the first preset value, the hydraulic oil in the small chamber of the boom cylinder controlled by the fourth oil port flows into the large boom cylinder between the power oil circuit and the loading oil circuit through the first oil port cavity for regeneration. The invention recognizes the operating speed of the boom through the change of the pilot pressure, activates the energy regeneration function of the boom after the pilot pressure reaches a preset value, regenerates hydraulic oil in the small chamber of the boom oil cylinder, reduces the energy consumption of the excavator, and improves the working efficiency of the excavator.

The invention relates to a ground brush device of vacuum cleaner, which comprise ground brush body and tube joint mounted at the ground brush body. The ground brush body is mounted with dust-collecting port and mounted with dust-collecting passage. The tube joint has internal tube cavity, which is communicated with dust-collecting passage through dust-collecting port. The ground brush device of the vacuum cleaner still comprise water-accumulating box possessing a water-inlet. At least part of water-accumulating box is mounted on ground brush body or tube joint. The water inlet of water-accumulating box is communicated with dust-absorbing passage or tube cavity in tube joint. At normal atmosphere, liquid in tube cavity or dust-collecting passage can flow into water-accumulating box through water inlet, which can prevent reverse flow of absorbed liquid to flowing back to surface to be cleaned, reduce the secondary pollution.

The present application relates to a steam iron comprising a steam generator and a sealed chamber having an inlet positioned so that calcified deposits formed in the steam generator fall under the influence of gravity through said inlet and into the chamber when the iron is moved from an ironing position into a non-ironing position. The chamber includes an inlet conduit that extends from the inlet and leads into a collection reservoir. The inlet conduit is configured so that water which flows from the steam generator into the collection reservoir through the inlet conduit when the iron is placed in said non-ironing position is trapped in the chamber when the iron is moved back into said ironing position. This occurs due to a balance of pressures between water in the collection reservoir, which acts against water that fills the inlet conduit, and atmospheric pressure that acts against water that fills the inlet conduit across the inlet.

The invention relates to the technical field of medical devices, in particular to a defecation device for gastroenterology, comprising a defecation device, the defecation device comprising a defecation cylinder, and an annular partition plate is laterally fixed in the defecation cylinder. The outer side of the baffle is a medicament cavity, and the inner side is a waste liquid cavity. A medicament suction tube is arranged on the upper direction of the laxative cylinder. The top end of the medicament suction tube is open, and the bottom end is communicated with the medicament cavity. A first pull rod is provided, and the bottom end of the first pull rod is fixedly connected with a first piston. In the present invention, a medicament cavity and a waste liquid cavity are arranged in the defecation cylinder, the medicament cavity is connected with a medicament suction pipe, a first pull rod and a first piston are arranged in the medicament suction pipe, a medicine inlet is arranged in the medicine cavity, and a second pull rod is arranged in the waste liquid cavity And the second piston, the waste liquid chamber is provided with a waste liquid outlet, which is convenient for the injection of the medicine and inconvenient to flow out, and at the same time, it is convenient for the drainage of the waste liquid.