85results about How to "Prevent water hammer" patented technology

The invention discloses a ball valve system for agricultural irrigation throttling and pipe water hammer protection and a control method thereof. The system comprises a first-stage ball valve and a second-stage ball valve which are connected in series, a main flowing hole and a throttling hole cut through the main flowing hole are formed in a valve element of the first-stage ball valve, and the first-stage ball valve is connected with a pressure release valve body through a bypass pipe in parallel. The control method includes the steps that part of water flow passes through the first-stage ball valve, the other part of the water flow enters the pressure release valve body through the bypass pipe, a stopping block is pushed through the water flow to move back and forth, and the water hammer pressure generated by valve closing is weakened depending on stretchable changes of a spring in the valve body. By means of the ball valve system, rising of the water hammer pressure can be effectively reduced, damage of pipe net water hammers to the pipe system safety is accordingly eliminated, and the ball valve system has the functions of throttling and water hammer eliminating.

The invention discloses a control method and a control device of a slow speed type electric valve. The control method is characterized in that a control box is internally provided with a ripple time relay, thereby achieving the purpose of adjusting the rotation speed of an electric valve motor and the running time in the opening and closing process. The control method not only can prevent a pipeline from generating a water hammer when the electric valve is rapidly opened and closed, and the deformation and detonation of the pipeline are avoided; and a valve electromotion device is prevented from abidingly operating for a long time, the burnt phenomenon of the valve electromotion device is avoided, the power of a motor is reduced, and the investment cost and operating cost are reduced.

The invention is mainly applied to the field of irrigation and fertilization in an apple planting process and in particular relates to a drip irrigation system. The system comprises a pump house head, a field head and a field pipe network. The pump house head comprises a water pump, an automatic backwash filter and a fertilizer injection device, wherein a water inlet end of the water pump is connected with a water pipe; an end of the water pipe is provided with a first filter; a water outlet end of the water pump is connected with the automatic backwash filter; a water outlet end of the automatic backwash filter is connected with the field head via a mixing pipe; the fertilizer injection device comprises fertilizer injection tanks which are connected with proportional fertilizer injectors via pipes; the proportional fertilizer injectors are connected with the mixing pipe via fertilizer injection pipes; one end of a water intaking hose is connected with the mixing pipe and the other end is connected with the fertilizer injection tanks. The drip irrigation system realizes water drip irrigation and fertilizer drip irrigation at the same time and prevents damage to the water pump and the pipe network; the service life of the system is prolonged and maintenance is convenient; the intelligent control system realizes intelligent irrigation and fertilization, increases the irrigation and fertilization efficiency, reduces manual operation and improves quality.

The invention provides a haze-removing, dedusting and cooling system for buildings, and relates to the field of the buildings. The haze-removing, dedusting and cooling system comprises a booster water pump, a water supply pipe, a water distribution pipe, branch pipes and a plurality of nozzles which are arranged on the top of a building, wherein the water supply pipe, the water distribution pipe and the branch pipes are orderly communicated; the input end of the booster water pump is connected with a water source, and the output end of the booster water pump is communicated with the water supply pipe; the nozzles are connected with the branch pipes and arranged around the buildings. The haze-removing, dedusting and cooling system breaks through the traditional thinking, corresponding spraying equipment are additionally mounted at the top of the conventional buildings and used for spraying atomized water around the buildings, and therefore the purpose of improving the micro-climate of the buildings is achieved. If most of buildings in the city adopt the haze-removing, dedusting and cooling system, the microclimatic environment of whole city can also be improved. The haze-removing, dedusting and cooling system only consumes small amount of electricity and atomized water, therefore being more energy-efficient and realizing better environmental protection.

The invention provides a dewaxing assembly line, belongs to the technical field of foundry machinery, and solves the problems that impurities are mixed into wax recovered by the existing dewaxing assembly line formwork when the wax is molten, and grains of sand are attached inside the formwork. The dewaxing assembly line comprises a frame and a pool; a chain track is fixed on the frame and a hanging box moving along the chain track is arranged on the chain track; a cold water shower device and a hot water shower device are arranged on the frame; the cold water shower device is arranged at the outer side part of the pool; the hot water shower device is arranged above the inlet end of the pool; the cold water shower device, the hot water shower device and the pool are orderly arranged clockwise or anticlockwise; the hanging box can be driven to pass through the cold water shower device, the hot water shower device and the pool through the chain track; a plurality of heating sheets connected with a hot steam source are vertically arranged inside the pool, and the heating sheets partition the pool into a plurality of S-shaped channels connected in series. The dewaxing assembly line is simple in structure, good in wax melting effect, high in work efficiency and high in yield of the formwork.

The invention relates to a low-resistance slow-closure type check valve. Since a hollow hole is arranged in a valve clack, when flowing through the low-resistance slow-closure type check valve, high-pressure water firstly flows through a valve clack hole and then enters a piston cavity, and since a vent hole is arranged on a rear cover, a pressure difference is formed, the high-pressure water pushes a piston to operate backwards, the valve clack is driven to operate backwards, the valve is in an opening state, water operates in a barrier-less expedite environment, and hydraulic loss is correspondingly reduced greatly. When the pressure of the water inlet of the valve is reduced or water is stopped, the high-pressure water in the piston cavity and the system flows to the low-pressure part, a backflow state occurs, and because the valve clack and water are in a radial force operating state, the valve clack operates backwards slowly, the low-resistance slow-closure type check valve is finally in a closed state, the non-return purpose is achieved, and the water hammer is avoided.

The invention discloses a rotary valve type pump protecting device. The problems that an existing pump protecting device is complex to operate and high in equipment investment, and safety needs to be further improved are solved. According to the technical scheme, the rotary valve type pump protecting device comprises a sealing valve body with a first flow channel, and a check valve is arranged in the first flow channel; the device further comprises a bypass valve body with a second flow channel, and the part, blow the check valve, of the first flow channel communicates with the second flow channel through a flow hole in a ball valve; the ball valve is fixedly connected with one end of a guide rod, and the other end of the guide rod is hinged to the check valve. The rotary valve type pump protecting device is simple in structure, free of manual operation, controllable in pressure, low in cost, efficient and safe.

The invention discloses a novel swing check valve, relating to a check valve. The novel swing check valve consists of a valve cap (1), a hinge pin (2), a rocking bar (3), a valve clack (4), a valve body (5) and an auxiliary valve (6), wherein the valve cap (1) is arranged on the upper end of the valve body (5), the hinge pin (2) is arranged on the upper end of the interior of the valve body (5), the rocking bar (3) is connected with the hinge pin (2), the auxiliary valve (6) is arranged on the lower side of the valve clack (4), and the valve clack (4) is connected with the rocking bar (3). The auxiliary valve is additionally arranged, thus the novel swing check valve has the advantages that the water hammer which damages a pipeline system and is caused by the traditional similar check valve is solved; the use range of the check valve is expanded; and the novel swing check valve is convenient to use.

The invention relates to the technical field of pipeline valves and particularly relates to a combined air valve comprising a valve body and a valve cover; an exhaust port is formed in the valve cover, and an upper floating body and a lower floating body which are overlaid up and down and of which the densities are smaller than the density of a fluid are arranged in a valve cavity of the valve body; a guide device is mounted on the valve cover; the upper floating body and the lower floating body can be arranged in the valve cavity in a way of vertically moving up and down through the limitation of the guide device, gas exhaust gaps are remained between the upper floating body and the inner wall of the valve body and between the lower floating body and the inner wall of the valve body, and an exhaust microchannel communicating with the exhaust port is formed in the upper floating body; the lower end of the exhaust microchannel is connected with the upper end surface of the lower floating body in a sealing way when the upper floating body and the lower floating body are connected together; and the lower end of the exhaust microchannel communicates with the gaps between the floating bodies and the inner wall of the valve body when the upper floating body and the lower floating body are disconnected. The combined air valve is simple in structure, convenient to mount, free of artificial unattendance, capable of rapidly and safely exhausting gases in a pipeline and prolonging the service life of a main structure of the pipeline and extremely high in popularization value.

The invention belongs to the field of energy conversion control, and relates to a sealing reversing valve which comprises a cylinder body, a reversing piston assembly and an executing mechanism. A pressure boosting hole is formed in the cylinder body, and a pressure relief groove is formed in the reversing piston assembly. According to the sealing reversing valve, the water pressure inside a waterpressure cylinder is boosted in advance through the pressure boosting hole, a low-pressure inlet check valve is slowly closed, and the problem of quick knocking of the low-pressure inlet check valveis solved, and the service life of the check valve is prolonged; high-pressure water flow in the water pressure cylinder is depressurized in advance through the pressure relief groove, water hammeringcaused when large-flow high-pressure concentrated water makes instant contact with low-pressure concentrated water is avoided, equipment vibration is avoided, and equipment operation noise is lowered. The invention further relates to an energy conversion device comprising the sealing reversing valve.

The invention relates to a rotary starting type check valve of a water hammer prevention mechanism for pipelines. The rotary starting type check valve comprises a valve body, wherein a valve part and a valve base are mounted in the valve body; the valve part is mounted in the valve body through a swing arm and a lifting plate; the lifting plate is n-shaped, and is mounted in the valve body through a support plate; the support plate is transversely placed in an inner cavity of the valve body, and is fixedly connected with the inner side wall of the valve body; the swing arm is arranged at the lower end of the lifting plate, and is fixed on the lifting plate through a pin shaft; the lower end of the swing arm is fixedly connected with the valve part; and the pin shaft is coated with a compression spring. The rotary starting type check valve has the following advantages: as the internal compression spring is added, preopening force is provided to the valve part when a medium normally flows, the valve is quickly opened, and the flow resistance is reduced; and when the medium flows back, slow closing force is provided to the valve part at the moment of closing the valve part, so that the closing speed is slowed down, the collision force of the valve part to a sealing surface is reduced, the water hammer phenomenon can be effectively prevented, the safe operation of the pipelines is guaranteed, and the service life of the pipelines is prolonged.

The invention discloses an axial-flow type check valve. The axial-flow type check valve comprises a valve body. A valve cavity is formed in the valve body. A valve deck is fixedly installed at the position, on an opening in the right end of the valve cavity, of the valve body. An outlet pipe communicating with the valve cavity is arranged on the left side of the valve body, and an inlet pipe communicating with the valve cavity is arranged in the valve deck. A valve element cylinder with an opening in the right end is arranged on the inner side wall of the valve cavity, a mounting block is arranged on the inner side wall of the valve element cylinder, a valve rod is connected in the mounting block in a sliding manner, and a valve element block used for controlling on-off of the inlet pipe is arranged at the right end of the valve rod. A protruding block is arranged at the left end of the valve rod, and a rotation stopping rod stretching into the protruding block is arranged on the leftside of the mounting block. The valve rod is sleeved with a first spring between the mounting block and the valve element block, and the first spring is used for forcing the valve element block to press the inlet pipe. A buffer assembly is arranged at the left end of the valve element cylinder, and a locking assembly is arranged on the protruding block. The check valve is simple in structure and can be slowly closed, and the water hammer phenomenon is prevented.

The invention provides a large vertical fermentation tank with integrated pipe layout. The fermentation tank comprises a vertical tank body, wherein a vertical pipe frame is arranged on one side of the vertical tank body; a mounting space is formed between the vertical pipe frame and the vertical tank body; corresponding process pipelines connected with various interfaces of the vertical tank bodyare fixed on the vertical pipe frame; a corresponding control valve is mounted on each of the process pipes. In the fermentation tank, the layout of the pipes connected to the fermentation tank is simple and reasonable; the large fermentation tank can be manufactured, transported and mounted more conveniently, so that the delivery period of a client is shortened; cooling water in jackets (row pipes) can be conveniently ensured to be exhausted; the production efficiency of the large vertical fermentation tank can be improved, and the cost of equipment investment of the client is lowered.

The invention belongs to the technical field of desulfurization wastewater treatment, and specifically relates to an energy conversion system for desulfurization wastewater zero discharge. The systemcomprises a raw water supply device, an energy conversion device, a reverse osmosis device, a pump and the like, wherein the energy conversion device comprises a water pressure cylinder, a check valveset and a sealing reversing valve, the water pressure cylinder comprises a water pressure cylinder body, a water pressure cylinder piston and a water pressure cylinder piston guide rod, the water pressure cylinder piston is arranged in the water pressure cylinder body and can reciprocate, the water pressure cylinder piston guide rod can act along with the water pressure cylinder piston, the contact area between the water pressure cylinder piston and high-pressure raw water is smaller than the contact area between the water pressure cylinder piston and high-pressure concentrated water, a waterpressure cylinder piston boss is arranged on the end surface, facing the opening of the water pressure cylinder end cover, of the water pressure cylinder piston, and part or all of the water pressurecylinder piston boss can enter the opening of the water pressure cylinder end cover, so that the impact force between the water pressure cylinder piston and the water pressure cylinder end cover whenthe water pressure cylinder piston is out of control in operation can be reduced so as to effectively protect the water pressure cylinder piston.

The invention relates to a static balance type dual-source type time on/off area heat metering system and method. The system comprises a client and a management end, wherein the client comprises a static balance on/off control valve arranged on a heat supply pipeline, an electric heating executor for controlling the static balance on/off control valve to open and close, an IC (Integrated Circuit)card type heat metering temperature controller and a user charging IC card, wherein the IC card type heat metering temperature controller is connected with the electric heating executor and is used for realizing temperature control; the user charging IC card is used for charging the IC card type heat metering temperature controller; and the management end comprises a charger and a computer. According to the static balance type dual-source type time on/off area heat metering system and method disclosed by the invention, on the basis of ensuring the static hydraulic balance, the hot water flow of each user is adjusted in advance according to the heat load of the user at the tail end so as to ensure that each user can acquire ideal heating temperature. The heat user prepays in a heat supply unit for purchasing the heating time; and the heat is generated by consuming the heating time.