RU44763U1 - HYDRAULIC DIAGRAM PUMP - Google Patents

Abstract

Hydraulic diaphragm pump refers to devices for the hydraulic transportation of materials, namely, pumps for pumping contaminated mixtures and liquids under high pressure, and can find application in the oil, chemical, food and other industries.

The hydraulic diaphragm pump contains a hydraulic actuator with valves, transfer sections, consisting of pipe housings with tubular diaphragms located inside them.

What is new is that frames are installed inside the transfer sections in the form of an asterisk in the cross section, the hollows of which smoothly pass into the circle in the fastening areas of the diaphragm, the perimeter of any frame section is equal to the circumference of the diaphragm hole, and for supplying and discharging the pumped liquid in the pipe casing bushings are installed with annular peripheral channels communicating with the valves and axial peripheral channels emerging from them turning into radial ones.

Due to the proposed design, the service life of the proposed pump exceeds the service life of known pumps by several times.

Description

The invention relates to devices for the hydraulic transportation of materials, namely, pumps for pumping contaminated mixtures and liquids under high pressure, and can find application in the oil, chemical, food and other industries.

A device for the hydraulic transportation of materials is known (see patent SU No. 1652245, publ. 05/30/1991, bull. No. 20), containing cylindrical containers with internal volume dividers in the form of elastic diaphragms fixed by rigid support elements along the walls of the containers, forming triangular prisms, the ribs of which are connected with the supporting elements, in which the pumped pulp is pumped into the diaphragm, from where it is displaced into the pressure pipe by a drive fluid pumped into the tank outside the diaphragm.

The disadvantage of this device is the low resistance of the diaphragm, which is destroyed in the attachment zone as a result of exposure to a high level of cyclic tensile and bending stresses at the time of applying high pressures.

A direct-flow hydraulic actuator diaphragm pump was taken as a prototype of the invention (see RU patent No. 2148190, publ. 04/27/2000), containing transfer sections with membranes and hydraulic valves, a hydraulic drive with hydraulic valves, while the transfer sections are made of tubular housings with inside them with elastic tubular membranes. In this pump, the transfer cavity is located inside the elastic tubular membrane, and the hydraulic drive cavity is outside and the pumped liquid is sucked due to the elastic properties of the membrane.

The disadvantage of this device, as well as the previous one, is the low resistance of the membrane.

The technical result of the invention is to increase the durability of the diaphragm.

This result is achieved due to the fact that the proposed pump contains a hydraulic actuator with hydraulic valves, transfer sections, consisting of pipe housings with tubular diaphragms located inside them. New is that inside the pumping sections there are carcasses, in cross section having the appearance of an asterisk, the troughs of which smoothly pass in the attachment zones

the diaphragms in a circle, the perimeter of any cross-section of the frame is made equal to the circumference of the inner diameter of the diaphragm, and for supplying and discharging the pumped liquid in the tube body, bushings with annular peripheral channels communicating with the valves and axial peripheral channels coming out of them turning into radial ones are installed.

Figure 1 of the accompanying drawings shows a hydraulic circuit of the pump;

figure 2 is a longitudinal section of the transfer section of the pump;

figure 3 is a section aa in figure 2 at the time of complete filling of the pumping cavity with the pumped liquid;

figure 4 is a section bB in figure 2 at the time of complete filling of the hydraulic drive cavity with high pressure oil.

The dotted lines in FIG. 3 and FIG. 4 show the other extreme position of the diaphragm.

The proposed hydraulic diaphragm pump consists of a hydraulic station 1, a block of control and regulating equipment 2, a control station 3, pump sections 4 with pump cavities 5 and hydraulic cavities 6 connected to inlet valves 7 and exhaust valves 8. Inlet valves 7 are connected through supporting pipelines 9 with a retaining line 10, and exhaust valves 8 through pressure lines 11 are connected to a pressure line of high pressure 12. Hydraulic drive cavity 6 from one end of the transfer sections through an electric hydraulic valves 13 are connected to the high pressure oil pipe 14 with the control unit controlling apparatus 2, and at the other end via the electrohydraulic valve 15 with a drain conduit 16.

The electrohydraulic valves 13 and 15 are controlled by a processor located in the control station 3. Each transfer section (Figs. 2, 3, 4,) consists of a tube body 17, inside which a tubular diaphragm 18 is installed, which is a cylindrical pipe made of a constant elastic material sections along the entire length with a ratio of diameter to length of approximately 1:10. A frame 19 is installed inside the diaphragm 18, connected at the ends of the flanges 20 to the tube body 17, from the ends of which there are bushings 21 with annular channels 22 located opposite the valve openings 7 and 8. From the annular channels 22, peripheral axial channels 23 are passed into radial channels 24, located around the entire circumference (figure 4). In cross section (figure 3, figure 4) the frame has the form

sprockets with hollows 25 and protrusions 26 connected by smooth mating lines. In the center of the frame 19, a through hole 27 is made, communicating with the hydraulic cavity 6 by holes 28 (FIG. 2, FIG. 3, FIG. 4). The perimeter of any section of the frame 19 is equal to the circumference of the hole of the diaphragm.

The pump operates as follows.

Hydraulic station 1 transfers the hydraulic fluid, hereinafter oil, to the control and control equipment unit 2, where the necessary pressure is set, and then is supplied through the high pressure oil pipe 14 to the electrohydraulic valves 13. The pump operation cycle starts from the transfer section 4. The electrohydraulic valve 13 is closed, valve 15 is open to drain. The pumped liquid is supplied to the pumping cavity 5 from the low pressure retaining line 10 through the retaining pipe 9 and the inlet valve 7. The exhaust valve 8 is closed by the liquid pressure from the pressure line 12. After filling the pumping cavity 5, the drain electro-hydraulic valve 15 closes and the electro-hydraulic valve 13 opens, through which oil under high pressure enters the hydraulic cavity 6 inside the diaphragm. When the pressure in the transfer cavity 5 above the pressure is reached, the inlet valve 7 closes, and when the pressure of the pressure line 12 is exceeded, the exhaust valve 8 opens and the pumped liquid is displaced into the pressure pipe 11 and pressure line 12. After the pumped liquid is displaced from the transfer cavity 5, the electro-hydraulic valve 13 closes and valve 15 opens to drain. When the pressure drops in the hydraulic cavity 6, the exhaust valve 8 automatically closes and the inlet valve opens 7. The cycle repeats. The cycle of operation of the remaining transfer sections 4 is exactly the same, only the beginning of the cycle of operation of each section is evenly shifted in time during the cycle of operation of the first section, which ensures uniform pump operation.

The control of the electrohydraulic valves 13 and 15 is set by the program introduced into the processor of the control unit 3. In principle, the number of transfer sections in the pump can be any, as well as the order of their operation: serial, parallel, serial-parallel. In the transfer section 4, the pumped liquid enters through the inlet valve 7 into the annular channel 22, from which it is transmitted through the axial channels 23 and the radial channels 24 to the diaphragm 18 and fills the pumping cavity with minimal impact on the diaphragm, since the main hydraulic shock perceives the annular opening channel

22. In this case, the diaphragm 18 displaces the oil from the hydraulic drive cavity 6 through the openings 27 and 28 to drain and fits the frame 19 (Fig. 3) around the entire perimeter without radial stretching and creases. When the pumping cavity is completely filled, a slight axial extension of the diaphragm is observed, but it does not exceed 5% of its length and does not affect the resource of its operation. In addition, all the largest deformations of the diaphragm occur at low retaining pressure (up to 1.5 MPa). When pumping the pumped liquid, the oil through the openings 27 and 28 in the frame 19 enters the diaphragm 18, which squeezes the pumped liquid into the channels 22, 23 and 24 through the exhaust valve 8 into the pressure line 12. At the end of the squeezing of the pumped liquid, the diaphragm 18 is completely adjacent to the walls of the hole the tube body 17 and the bushings 21 without tension, folds and bending, that is, in the loaded state only experiences compression stress from pressure, which can reach 10 MPa. Thus, the dead space of the transfer sections is minimized and does not exceed 0.1% of the volume of the transfer cavity, which makes it possible to use these pumps when pumping oil and gas mixtures.

Due to the proposed design, the service life of the proposed pump exceeds the service life of known pumps by several times.

Claims (1)

A hydraulic actuated diaphragm pump containing a hydraulic actuator with hydraulic distributors, transfer sections, consisting of pipe housings, with tubular diaphragms placed inside them, characterized in that frames are installed inside the transfer sections in the form of an asterisk in cross section, the troughs of which smoothly pass into the diaphragm attachment areas in the circle, the perimeter of any cross-section of the frame is made equal to the circumference of the diaphragm hole, and for supplying and discharging the pumped liquid in the pipe casing, bushings with ring peripheral channels communicating with the valves and axial peripheral channels emerging from them turning into radial ones.