41results about How to "Won't pour back" patented technology

The invention relates to a two-stage deoxidized exhaust steam condensing device for heat-exchange mixed exhaust steam recovery of condensate water and desalted water. A pressure-bearing buffer tank is provided with a first water inlet pipe, a second water inlet pipe, a third water inlet pipe and a fourth water inlet pipe, wherein the first water inlet pipe and the third water inlet pipe are located on the upper layer, and the second water inlet pipe and the fourth water inlet pipe are located on the lower layer; mixed condensate water is introduced into the second water inlet pipe and the fourth water inlet pipe respectively after subjected to indirect heat exchange by a third heat exchanger and a fourth heat exchanger, and synthesis ammonia desalted water and conversion desalted water are introduced into the first water inlet pipe and the third water inlet pipe respectively after subjected to indirect heat exchange of the third heat exchanger and the fourth heat exchanger; buffer tank exhaust steam is cooled into buffer tank exhaust steam condensate water by a first heat exchanger; buffer tank outlet water is sent into a high-pressure deaerator by a first water pump, and drained water of a deaerator tank is sent to a boiler water replenishing pipe by a third water pump; the deoxidized exhaust steam is cooled into deoxidized exhaust steam condensate water by a second heat exchanger, the buffer tank exhaust steam condensate water and the deoxidized exhaust steam condensate water are injected into the pressure-bearing buffer tank by a condensate water collecting tank and a second water pump, and meanwhile, gas is discharged; and a forcible mixing impeller is mounted at the middle-lower part of the pressure-bearing buffer tank. According to the device, the utilization rate of condensate water waste heat is high, and the operation is reliable.

The invention discloses a starting anti-rotation device for a shield machine and a construction method thereof. A pair of rails are arranged at intervals in the lower part of the steel sleeve, which includes the following steps: Step 1. A pair of inner and outer through holes are arranged symmetrically on the shield body. jacks, and the distance between a pair of jacks is set so that they can be located on both sides of a pair of rails; Step 2, seal and fix the sleeve in the jack, and set threads on the inner wall of the sleeve; Step 3, A pair of screw rods are threadedly connected in a pair of sockets respectively, and can extend or retract into the outer wall of the shield. The invention has the advantages of simple structure, convenient use, good sealing effect and the like.

The invention relates to a secondary deoxidizing device for performing indirect heat exchange and forced mixing on condensed water and desalted water. A pressure-bearing buffer tank is connected with first and third water inlet pipes positioned on an upper layer as well as second and fourth water inlet pipes positioned on a lower layer; mixed condensed water is introduced into the second and fourth water inlet pipes respectively after undergoing indirect heat exchange with synthetic ammonia desalted water and transformed desalted water through third and fourth heat exchangers respectively; the synthetic ammonia desalted water and transformed desalted water are introduced into the first and third water inlet pipes respectively after undergoing heat exchange through the third and fourth heat exchangers; the middle part of the top wall of the pressure-bearing buffer tank is connected with a buffer tank exhaust pipe; buffer tank output water is pumped into a high-pressure deoxidizer through a first water pump; deoxidizing box drainage water is pumped into a water replenishing pipe of a boiler through a third water pump; the top of a deoxidizing head of the high-pressure deoxidizer is connected with a deoxidizing head exhaust pipe for exhausting deoxidizing exhaust steam and non-condensable gas; a forced mixing impeller is arranged on the middle lower part of the inner cavity of the pressure-bearing buffer tank; and a bottom plate of the pressure-bearing buffer tank is connected with a blow-off pipe. The device is high in residual heat utilization ratio of condensed water, and runs reliably.

The invention discloses a check valve with double fireproof valves for a smoke flue, which comprises a valve body, a sealing valve and a spring and is characterized in that the valve body is divided into a main valve body and an auxiliary valve body; and the auxiliary valve body is placed in the main valve body and is assembled with the main valve body in a matching manner. The check valve has the advantages that the fireproof valves of the check valve have the function of leading smoke upwards, no smoke backflow can be generated, and the smoke-blocking and fireproof effects are good; and moreover, the big flue is not required, so that the building weight can be reduced, the kitchen space is enlarged, and the construction cost is reduced.

The invention provides a loading valve. The loading valve comprises a valve body, a valve sleeve, and an exhaust pipe; the valve body is provided with a valve cavity, the valve sleeve is provided with an axial through hole, the top end of the valve sleeve stretches into the valve cavity, the bottom end of the valve sleeve is arranged outside the valve body, a spring which can drive the valve sleeve to move in the opposite direction relative to the valve body is arranged between the valve sleeve and the valve body; an anti-separation structure for preventing the valve sleeve from being separated from the valve body is arranged between the valve body and the valve sleeve; the loading valve also comprises a liquid feeding pipe, a first gap is arranged between the liquid feeding pipe and the valve body, a second gap is arranged between the liquid feeding pipe and the valve cover, the bottom end of the liquid feeding pipe is connected to a liquid discharge part, the outer diameter of the liquid discharge part is larger than the outer diameter of the liquid feeding pipe, the joint part between the liquid feeding pipe and the liquid discharge part forms an end face of shaft shoulder, and the side wall of the liquid discharge part is provided with a liquid outlet. The loading valve is especially suitable for loading liquid containing particles, the valve sleeve will not be separated from the valve body, the particles cannot be easily left, and the installation and disassembly of the loading valve are both convenient.

The invention provides a thyristor trigger circuit for a three-phase input rectification circuit of a frequency converter, including a fast recovery diode, a charging capacitor, a MOSFET, a MOSFET gate drive adjustment circuit and a thyristor drive circuit; the input terminal of the trigger circuit inputs phase voltage, phase voltage After the fast recovery diode is connected to the positive pole of the charging capacitor, the positive pole of the charging capacitor is connected to the source of the MOSFET, the drain of the MOSFET is connected to the gate of the thyristor to be triggered through the thyristor drive circuit, and the negative pole of the charging capacitor is connected to the thyristor to be triggered The cathode is connected to the positive bus bar of the inverter rectifier circuit, and a MOSFET gate drive adjustment circuit is provided between the charging capacitor and the gate of the MOSFET. The thyristor trigger circuit of the present invention is used in a three-phase input rectifier circuit, which makes the scheme more concise and practical, and reduces the cost.

The invention discloses a novel foam liquid injecting system. The novel foam liquid injecting system comprises a nitrogen pipeline and a PLC control system; a first tee ball valve is mounted on the nitrogen pipeline and is used for dividing the certain section of the nitrogen pipeline into two branch pipelines, a foam liquid storage tank is arranged on each branch pipeline, then the two branch pipelines are combined into one pipeline, and opening and closing of the first tee ball valve is automatically controlled through the PLC control system. According to the novel foam liquid injecting system, kinetic energy of nitrogen during flowing in the pipeline, pressure of the foam liquid storage tanks and gravitational potential energy of foam liquid are fully utilized, so that the mixed foam liquid is injected and carried without using extra power, a plunger pump is successfully replaced, and the problems of high energy consumption, high cost and poor stability generated by using an original plunger pump are effectively solved; and the novel foam liquid injecting system has the characteristics of low cost, low energy consumption, good running stability, simple operation, easy arrangement and easy maintenance, and has very important practical value in the field of petroleum exploitation.

The invention relates to the technical field of oil and gas well cementing devices, and provides an automatic grouting device for a well cementing sleeve. The automatic grouting device for the well cementing sleeve includes a tubular device main body, a single-flow valve assembly is arranged in the device main body, the single-flow valve assembly includes a spring seat, and the spring seat is provided with a spring for abutting against a valve ball to a valve port of the single-flow valve assembly, the valve port is formed by a one-way movable valve seat disposed in the device main body, the one-way movable valve seat includes two or more valve blocks swinging up and down, and the valve blocks have a closed state in which the valve port is formed by mutual closing and an open state for thevalve ball to pass from top to bottom, the top of the spring is provided with a valve ball seat for supporting the valve ball, and the valve ball seat is provided with a ball seat circulating hole communicated with the valve port. The device does not need intermittent operation and has a stable working state during grouting and can reduce the amount of work, improve the work efficiency of the well cementing operation, reduce parts needed during the grouting process and reduce the production cost.