EA040904B1 - PUMP UNIT - Google Patents

Description

Technical field

The invention relates to pumping units designed for pumping media with a high content of solids, aggressive or toxic liquids and lifting them, including from great depths.

State of the art

Known diaphragm pump with hydraulic drive for pumping water and contaminated liquids. The pump consists of at least two pump units. Each pumping unit includes a fluid-driven hydraulic drive cylinder and a separate hydraulic cylinder associated with it for metered pumping and pumping of the working fluid into the fluid-driven cylinder. Each media driven cylinder contains a bellows closed at its lower end and open at its upper end for connection to the media. Outside the bellows there is a cavity for the pumped medium. [Application WO2015128283, IPC F04B 43/113; F04B 9/105. Hydraulically driven bellows pump / Bilousov Anatoliy [UA]; Rothenbuhler Jorg H [CH]; Garniman S A [UY]; Saxontechnologies S R L [CH]. Application WO2015EP53714; Appl. 02/23/2015. Published 03.09.2015.] [1].

The disadvantages of this pump include the fact that the operation of the hydraulic cylinder in the pump discharge line is associated with friction. As a result, the operation of the pump occurs with significant energy consumption. In addition, there may be leakage through the seal on the piston, which separates the working medium in the diaphragm and in the discharge line. In addition, the installation of any additional equipment increases its weight and size characteristics. The cylinder controlled by the working medium is made with a hole in the lower part, which is the inlet and outlet for the pumped medium. Such an arrangement of the outlet can lead to both contamination of the internal cavity of the cylinder controlled by the working medium, and the formation of air bubbles in the upper part of the cylinder.

The claimed technical solution differs from the given analogue in the following design features.

The pressure of the working medium into the internal cavity of the bellows in the discharge line is carried out directly from the pressure pump. Friction nodes are absent.

Pumping out the working medium from the internal cavity of the bellows in the discharge line is carried out by a pump for pumping out.

The housing has several inlet and outlet openings, characterized in that the suction opening in the casing of the pumping unit is located in its lower part, and the discharge opening is in the upper part of the casing.

Known pump GEHO® APEXS company Weir Minerals Netherlands.

The pump is a double-chamber, single-acting, hydraulically actuated, high-pressure peristaltic pump designed for pumping contaminated liquids. The pump contains a rigid housing and a flexible tubular structure located in the internal space of the housing. The pump consists of at least two cylinders controlled by the working medium. The cylinder controlled by the working medium contains a deformable body in the form of an elastic pipe, closed in its upper end part and open in its lower end part for connection with the pumped medium. Outside the elastic tube there is a cavity for the working medium. When the working medium is injected into the cavity of the cylinder controlled by the working medium, the working volume changes in the internal cavity of the elastic tube. Thus, the variable actions for pumping out and forcing the working medium into the cavity of the cylinder controlled by the working medium characterize the operation of the pump. [Application WO2004011806, IPC F04B 43/10; F04B 43/113. Fluid operated pump / Combined Resource Engineering [AU]; Morris Gordon Leith; West Robert Leslie. Application WO2003AU00953; Appl. 07/29/2003; Published 05.02.2004].

The disadvantages of this pump are: an elastic pipe is used as a working body for changing the working volume. The elastic pipe works in tension, which leads to faster wear of the working body; cylinders controlled by the working medium are located at an angle to the horizon. This arrangement can cause blockages (bags with mechanical impurities); the cylinder controlled by the working medium has an inlet and outlet for the pumped medium in its lower part, such an arrangement of the hole can lead to the formation of blockages (bags with mechanical impurities); the use of a tubular diaphragm requires a complex system for controlling the working position of the diaphragm in the expanded and compressed state. In this case, it is important that the deformation of the elastic pipe occurs according to a known law.

The essence of the invention

The problem solved by the claimed technical solution is the creation of a high-performance pumping unit.

The technical result consists in reducing the weight and dimensions of the pumping unit, increasing energy efficiency and reliability. This result is achieved by using a longitudinally deformable bellows, which, in turn, allows the use of a lighter and more compact cylindrical pump casing with a ratio of the length of the cylinder to its diameter of more than 2 to 1, and the large working volume of the bellows per stroke makes it possible to reduce the number of cycles at the same performance and, accordingly, increase the life of the membrane.

A direct hydraulic drive in the form of hydraulic lines alternately connected to the internal cavity of the bellows, a system of hydraulic valves and hydraulic pumps does not have friction units inherent in membrane pumps of other designs, namely a piston or plunger group, which create friction losses and require maintenance, and hydraulic pumps of the same performance have several times smaller dimensions compared to piston or plunger drives, which have overall and heavy crank mechanisms.

As well as increasing energy efficiency by combining a bellows and a direct hydraulic drive with at least two independent hydraulic lines, at least one of which has a working medium pressure lower than the pressure of the pumped medium at the inlet to the pumping unit, and at least one of which has a working medium pressure more than the pressure of the pumped medium at the inlet to the pumping unit.

The technical result of the claimed invention is achieved due to the fact that the pumping unit, including a housing made with at least two parts with internal cylindrical cavities, with holes for supplying and discharging the pumped medium, at least two longitudinally deformable bellows, each of which is fixed inside each part of the body with one end surface to one inner end surface of each part of the body, while the opposite end side of each bellows is made with a plug, and on the end surface of each part of the body connected to the bellows, a hole is made for supplying the working medium into the internal cavity, limited bellows, its plug and the end surface of the housing part, the hydraulic control system of the pumping unit, characterized in that the hydraulic control system of the pumping unit is made in the form of a tank with a working medium, an injection pump, at least two independent hydraulic lines and a valve system configured to alternately connect the internal cavities of the bellows with the working fluid to the first or second line, depending on the positions of the bellows, while the hydraulic lines are designed in such a way that in one line the pressure of the working medium is less than the pressure of the pumped medium at the inlet to the pumping unit, and in the second line the pressure of the working medium is greater than the pressure of the pumped medium at the inlet to the pumping unit, and the internal cavity of each bellows is connected by lines with the possibility of alternate switching with the pressure pump for supplying the working medium through the first hydraulic line, and with the tank with the working medium through of the second hydraulic line, and the pumping unit additionally contains a means for controlling the position of each bellows, configured to control the alternate connection of the internal cavity of the bellows with the working fluid to the first or line depending on the positions of the bellows.

In a particular case of the implementation of the claimed technical solution, the means for controlling the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a fixed tube and a rod, while one end of the rod is attached to the bellows plug, and the other end of the rod is freely placed in the tube located on the opposite from the end surface of the bellows with a plug to the side, and on the tube at a distance of the bellows stroke, rod position sensors are installed.

In a particular case of implementation of the claimed technical solution, a pump is additionally installed on the second hydraulic line for pumping the working medium into the tank.

In a particular case of the implementation of the claimed technical solution, the means for monitoring the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a position sensor in conjunction with a rod and a tube, while one end of the rod is attached to the bellows plug, and the other end of the rod is freely placed in the tube, located on the side opposite from the end surface of the bellows with a plug, while on the stem there are marks for controlling the positions of the stem.

In a particular case of the implementation of the claimed technical solution, the means for monitoring the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a sensor and a coil with a cable, made with the possibility of rotation, while the coil is located on the side of the opposite end surface of the bellows with a plug, and the cable at one end attached to the plug.

In a particular case of the implementation of the claimed technical solution, the means for monitoring the position of each bellows is made in the form of a speed sensor installed on the pressure pump, configured to control the filling of the internal cavity of the bellows by determining the volume of the working medium necessary to fill the internal cavity of the bellows.

In a particular case of the implementation of the claimed technical solution, the holes for supplying and discharging the pumped medium are made in the lower and/or upper part of the body.

In a particular case of implementation of the claimed technical solution, the bellows is made up of separate deformable membranes connected in series with each other by end surfaces.

Brief description of the drawings

Details, features, and advantages of the present invention follow from the following description of the embodiments of the claimed technical solution using the drawings, which show:

fig. 1 - pumping unit, fig. 2 - position control by sensors and rod, fig. 3 - end sensor, fig. 4 - version of the pumping unit with an additional group of casings with a cylindrical cavity, fig. 5 - a variant of the control of the working fluid in the pumping unit, fig. 6 - a variant of the control of the working fluid in the pumping unit, fig. 7 - a variant of the control of the working fluid in the pumping unit by means of a system of hydraulic locks with electromagnetic control, fig. 8 shows an implementation of the bellows position control, FIG. 9 shows an embodiment of the bellows position control.

The figures indicate the following positions:

- the first part of the body;

- bellows;

- suction valve;

- discharge valve;

- pressure pump;

- pump for pumping out;

- hydraulic injection control distributor;

- hydraulic distributor;

- controlled valve;

- tank with working medium;

- the second part of the body;

- the second bellows;

- suction valve;

- discharge valve;

- plug of the first bellows;

- hydraulic control system of the pumping unit;

- injection line;

- suction line;

- controlled valve;

- the first hydraulic line;

- the second hydraulic line;

- lower position sensor;

- stock;

- a tube;

- pumped medium;

- working environment;

- plug of the second bellows;

- stock;

- end sensor;

- end sensor;

- upper position sensor;

- valve;

- valve;

- valve;

- valve;

- hydraulic distributor;

- hydraulic distributor;

- hydraulic distributor;

- hydraulic distributor;

- control pump;

- control line;

- hydraulic lock;

- hydraulic lock;

- hydraulic lock;

- hydraulic lock;

- 3 040904

- sensor;

- sensor;

- bay;

- bay;

- speed sensor.

In addition, positions a and position b of the injection control hydraulic distributor (7) and positions c and d of the hydraulic distributor (8) are also shown in the figures.

Disclosure of invention

The pump unit (Fig. 1) consists of a housing made of at least two parts (1) and (11), each part (1 and 11) of the pump unit housing is made with a cylindrical internal cavity. A bellows (2) and (12) is installed inside each of the mentioned parts (1 and 11) of the casing of the pumping unit. Bellows (2) and bellows (12) are installed to the upper or lower end inner surface of each part of the housing (1) and (11) of the pumping unit.

Each bellows (2) and (12) is closed in the free part by a plug (15) and (27) respectively. The cavity resulting from the installation of the bellows (2) and (12) to the end surface of each part (1) and (11) of the casing of the pumping unit, where the free part of the bellows (2) and (12) is closed with a plug (15) and (27) , respectively, forms the internal cavity of the bellows (2) and (12). The bellows (2) and (12) with a plug installed inside the part (1) and (11) of the casing of the pumping unit separates the working medium (26) located in the internal cavity of the bellows (2) and (12) and the pumped medium (25 ) located behind the bellows (2) and (12) in the cavity of the part (1) and (11) of the casing of the pumping unit.

Each part of the housing (1 and 11) of the pumping unit is made with inlet and outlet holes, to which the suction line (18) and the discharge line (17) are connected, respectively. A pressure valve (4) and (14) is installed on the discharge line (17) of the pumped medium (25). A suction valve (3) and (13) is installed on the suction line (18) of the pumped medium.

The pump unit contains a hydraulic system (16) for controlling the pump unit, made in the form of a tank with a working medium (10), an injection pump (5), at least two independent hydraulic lines (20 and 21) and a valve system.

The hydraulic control system of the pumping unit (16) during operation consists of two independent hydraulic lines (20 and 21).

The first (20) hydraulic line is made with a pressure greater than the pressure of the pumped medium (25) on the suction line (18).

The second (21) hydraulic line is made with a pressure less than the pressure of the pumped medium (25) on the suction line (18).

The first hydraulic line (20) of the control line of the pumping unit (16) connects each bellows (2 and 12) to the pressure pump (5) for supplying the working medium (26) included in the pumping unit. In this case, each bellows (2 and 12) is connected to the pump (5) by means of the injection control hydraulic distributor (7) installed on the first hydraulic line (20). The hydraulic injection control distributor (7) is configured to distribute the supply of the working medium (26) to the mentioned bellows (2 and 12). The pump (5) for supplying the working medium (26) is also connected by the first hydraulic line (20) of the control line (16) to the tank (10) with the working medium.

In this case, the pressure pump (5) for supplying the working medium (26) to each bellows (2 and 12) is also connected by the lines of the first hydraulic line (20) to the hydraulic distributor (8) for unlocking and locking the controlled valve (9 and 19). The controlled valve (9) and (19) is installed at the junction of the first and second hydraulic lines (20 and 21) of the control line (16).

The second hydraulic line (21) of the control line (16) connects each bellows (2 and 12) with the pump (6) for pumping out the working medium (26) included in the pumping unit. The pump (6) for pumping out the working medium (26) is connected by the second hydraulic line (21) to the tank (10) with the working medium.

The operation of the pumping unit (FIG. 1) can be divided into two stages according to the position of the injection control hydraulic valve (7) (c and d).

With the initial position (c) of the hydraulic injection control valve (7), the pumping unit operates as follows.

The pumped medium (25) enters the suction line (18). The injection control hydraulic valve (7) switches to position (c), at the same time the hydraulic valve (8) switches to position (b), thus opening the pilot valve (19) and closing the pilot valve (9). The pressure pump (5) and the pump for pumping out (6) circulate the working medium (26) through the control line (16) of the pumping unit.

As a result of the above actions, pumping out by the pump (6) begins to pump out the working medium (26) from the internal cavity of the second bellows (12), buried in its free part with a plug into the tank (10), and the supply of the working medium by the pressure pump (5) into the internal cavity bellows (12), closed in its free part with a plug from the tank (10). The pumped out working medium (26) from the internal cavity of the second bellows (12), closed in its free part by a plug (27), creates

- 4 040904 vacuum at the suction of the pumped medium inside the second part of the body (11), due to which the suction valve (13) opens and the discharge valve (14) closes in the line of the pumped medium.

This is followed by filling the second part of the body (11) with the pumped medium (25).

At the same time, due to the supply by the pressure pump (5) of the working medium into the internal cavity of the bellows (2), closed in its free part by a plug (15), an excess pressure is formed in the housing (1), leading to the closing of the suction valve (3 ) and opening the discharge valve (4). Simultaneously, as the working medium (26) is injected into the internal cavity of the bellows (2), closed in its free part by a plug (15), the pumped medium rushes into the injection line (17). From which it follows that the movement of the bellows (2) and (12) with plugs is carried out in opposition to each other.

After the bellows (2) with the plug (15) has reached the extreme stretched state in combination with the reached extreme compressed state of the bellows (12) with the plug (27), the injection control hydraulic distributor (7) switches to position (d).

With the initial position (d) of the hydraulic injection control valve (7), the pumping unit operates as follows.

The injection control hydraulic valve (7) switches to position (d), at the same time the hydraulic valve (8) switches to position (a), thus opening the pilot valve (9) and closing the pilot valve (19). The pressure pump (5) and the pump for pumping out (6) circulate the working medium through the control line of the pumping unit.

As a result of the above actions, the pump for pumping out (6) of the working medium from the internal cavity of the bellows (2), closed in its free part with a plug (15), begins to be pumped into the tank (10) and the pressure pump (5) supplies the working medium into the internal cavity of the bellows (12), buried in its free part with a plug (27), from the tank (10). The pumped out working medium from the internal cavity of the bellows (2), closed in its free part by a plug (15), creates a vacuum in the inside of the body (1), due to which the suction valve (3) opens and the discharge valve (4) closes. This is followed by filling the housing (1) with the pumped medium (25).

At the same time, due to the supply by the pressure pump (5) of the working medium into the internal cavity of the bellows (12), closed in its free part by a plug (27), an excess pressure is formed in the housing (11), leading to the closing of the suction valve (13 ) and opening the discharge valve (14). Simultaneously, as the working medium is injected into the internal cavity of the bellows (12), closed in its free part by a plug (27), the pumped medium (25) rushes into the injection line (17).

After the bellows (12), closed in its free part by a plug (27), reaches the extreme stretched state, in combination with the reached extreme compressed state of the bellows (2), closed in its free part by a plug (15), the hydraulic control valve for injection control (7) switches to position (c). The process is repeated.

The claimed technical solution can be implemented in the following versions, in which the control of the position of the bellows (2) and (12) is carried out by position sensors (22.31) and rod (23) or end sensors (29 and 30).

In the embodiment of the claimed invention, in which the control of the position of the bellows (2 and 12) is carried out by position sensors (22,31) and the stem (23) (Fig. 2), the position of the bellows is controlled due to the stroke of the stem (23) in the tube (24 ), on which two position sensors (22,31) are installed at a distance of the bellows stroke. The stem (23) is installed in the inner cavity of each bellows (2) and (12), closed in its free part with a plug (15 and 27, respectively). Holes are made on the rod (23). One end of the rod (23) is attached to the plug (15 and 27), the other end of the rod is freely placed in the tube (24). In each part of the housing there is a tube (24), which, in turn, is fixed in the upper part of the housing (1 and 11, respectively). On each tube (24), perpendicular to the axis, position sensors (22,31) of the rod are installed. In this case, in the upper part of each tube (24) there are upper position sensors (22), and in the lower part of each tube (24) there are lower position sensors (31). The distance between the upper (22) and lower (31) position sensors must not exceed the stroke of the bellows (2) and (12), closed in its free part by a plug (15 and 27, respectively). At the moment when the bellows (2) or (12) are in the most extended state, the upper part of the stem (23) is opposite the lower position sensor (31). The lower sensor (31) detects the position of the bellows is stretched, the pressure control hydraulic distributor (7) and the hydraulic distributor (8) change position. The stem (23) starts moving up. When the rod (23) of the upper sensor (22) reaches the position, the upper sensor (22) fixes the position of the bellows is compressed, the pressure control hydraulic distributor (7) and the hydraulic distributor (8) change position.

In the embodiment of the claimed technical solution, the bellows position control is implemented using one position sensor in conjunction with the stem (23), on which two position control holes are made. This method is implemented by assigning successive values to the signals from the sensor: the bellows is stretched and the bellows is compressed when it reaches the hole on the rod (23) of the working surface of the sensor.

In an embodiment of the claimed invention, in which the control of the position of the bellows is carried out (Fig. 3) by end sensors (29, 30), while the control of the position of the bellows (2 and 12), closed in the free part by a plug (15 and 27 respectively), is carried out by the moment the plug touches the end sensors, in this embodiment of the claimed technical solution, the lower end sensor (30) is located in the lower part of each part of the body (1) and (11) and in the upper part inside each bellows (2) and (12) the upper end sensor (29) is located. If the bellows (2) or (12) with the plug is stretched, then at the moment of its maximum stretching, the plug will touch the lower end sensor (30), the pressure control hydraulic valve (7) and the hydraulic valve (8) will change position. The bellows (2) or (12) with plug will start to move upwards. When the bellows (2) or (12), closed in its lower part with a plug, is compressed, the bellows (2) or (12) with the plug (15 and 27, respectively) will reach its extreme compressed state, the plug (15 and 27) will touch the upper ( 29) of the end switch, the upper (29) end switch fixes the position of the bellows is compressed, the pressure control hydraulic distributor (7) and the hydraulic distributor (8) change position.

Additionally, one of the options for implementing (Fig. 8) control of the position of the bellows is the use of a cable wound on the coil (48, 49). The bay (48, 49) is installed in the upper part of the pump unit body (1, 11), and the cable is fixed on the plug (15, 27). The reciprocating movement of the bellows (2, 12) leads to unwinding and, accordingly, winding of the cable on the bay (47, 48). The rotational movement of the coil (48, 49), resulting from the movement of the bellows, is recorded by the sensor (46, 47). The sensor (46, 47) can be of contact and non-contact action.

In addition to direct methods for controlling the position of the membrane (bellows) (2, 12), there is an indirect method (Fig. 9) - controlled filling of the internal cavity of the bellows (2) or (12), closed in its lower part with a plug (15 and 27, respectively), pressure pump (5) working medium (26). The calculation of the required volume for filling the internal cavity of the bellows (2) or (12), closed in its lower part with a plug (15 and 27, respectively), with an injection pump (5) is implemented using a speed sensor (50) installed on the injection pump (5 ).

Your options for monitoring the position of a bellows closed in its lower part with a plug do not fully cover the possible ways to track the position of the bellows.

In this case, the pumping unit can be made both with at least two parts of the housing, and with a large number of parts. An increase in the number of body parts leads to the need to install a number of additional elements:

discharge hydraulic distributor (7), hydraulic distributor (8), part or parts of housings (1, 11), discharge valve (4, 14), suction valve (3, 13), pilot valve (9, 19).

The interaction of the above elements of the pumping unit is carried out through the first and second hydraulic lines (20, 21) (Fig. 4).

The pumping unit (Fig. 4) consists of a housing divided into four parts, each part is made with a cylindrical internal cavity. A bellows is installed inside each of the mentioned parts of the casing of the pumping unit. Each of the bellows is installed to the upper end inner surface of each part of the casing of the pumping unit. Each bellows is closed at the bottom with a plug. The cavity resulting from the installation of the bellows to the upper end surface of each part of the casing of the pumping unit, where the lower part of the bellows is closed with a plug, the inner cavity of the bellows. A bellows with a plug installed inside a part of the casing of the pumping unit separates the working medium (26) located in the inner cavity of the bellows and the pumped medium (25) located behind the bellows in the cavity of the casing of the pumping unit.

Each part of the casing of the pumping unit is made with inlet and outlet openings to which the suction line (18) and the discharge line (19) are connected, respectively.

Discharge valves are installed on the discharge line (17) of the pumped medium (25). Suction valves are installed on the suction line (18) of the pumped medium.

The pump control line (16) during operation consists of two independent hydraulic lines (20 and 21).

The first (20) hydraulic line is made with a pressure greater than the pressure of the pumped medium (25) on the suction line (18). The second (21) hydraulic line is made with a pressure less than the pressure of the pumped medium (25) on the suction line (18).

The first hydraulic line (20) of the control line of the pumping unit (16) connects each bellows to the pressure pump (5) for supplying the working medium (26) included in the pumping unit. In this case, each pair of bellows is connected to the pump (5) by means of hydraulic injection control valves installed on the first hydraulic line (20). Each of the injection control hydraulic distributors is configured to distribute

- 6 040904 supply of the working medium (26) to the said bellows. The pump (5) for supplying the working medium (26) is also connected by the first hydraulic line (20) of the control line (16) to the tank (10) with the working medium.

In this case, the pressure pump (5) for supplying the working medium (26) to each pair of bellows is also connected by lines of the first hydraulic line (20) to hydraulic distributors for unlocking and locking the controlled valves. The pilot valve is installed on the hydraulic line (21) of the control line (16).

The second hydraulic line (21) of the control line (16) connects each bellows with a pump (6) for pumping out the working medium (26) included in the pumping unit. The pump (6) for pumping out the working medium (26) is connected by the second hydraulic line (21) to the tank (10) with the working medium.

Description of valves and their control.

The control of the pumping unit is to control the flow of the working medium. This control is mainly carried out through valves of various designs. The valves can be operated electromagnetically, hydraulically or pneumatically.

Management of the working fluid in the pumping unit in Fig. 5 goes through the hydraulic injection control distributor (7). Turning the injection control hydraulic distributor (7) into position c leads to the injection of the working fluid into the internal cavity of the bellows (2), closed in its free part by a plug (15), and pumping out the working fluid from the internal cavity of the bellows (12), closed in its free part. parts with plug (27). After the cycle is completed, the injection control hydraulic distributor (7) switches to position d, which leads to the injection of the working fluid into the internal cavity of the bellows (12), closed in its free part by a plug (27) and pumping out the working fluid from the internal cavity of the bellows (2) closed in its free part with a plug (15).

In addition to the method described above, there is a variant of FIG. 6 control of the working fluid using a system of valves (32, 33, 34, 35) and hydraulic distributors (36, 37, 38, 39) through the control line (41). The hydraulic fluid is controlled by the control pump (40) through the control line (41), the valve system (32, 33, 34, 35) and the hydraulic distributors (36, 37, 38, 39).

The operation of the pumping unit (Fig. 6) should be considered according to the position of the hydraulic distributors (36, 37, 38, 39). The position of hydraulic distributors (36,37,38,39) in positions (a, b, b, a), respectively, leads to the delivery of the working medium by the pressure pump (5) into the internal cavity of the bellows (2), closed in its free part with a plug ( 15). Overpressure builds up in the body (1), causing the suction valve (3) to close and the discharge valve (4) to open. Simultaneously, as the working medium is forced into the internal cavity of the bellows (2), closed in its free part by a plug (27), the pumped medium (25) rushes into the injection line (17). At the same time, the working medium is pumped out by a pump for pumping out (6) from the internal cavity of the bellows (12), closed in its free part by a plug (27).

After the bellows (2), closed in its free part by a plug (15), has reached the extreme stretched state, in combination with the reached extreme compressed state of the bellows (12), closed in its free part by a plug (27), hydraulic distributors (36, 37, 38, 39 ) switches to position (b, a, a, b). The process is mirrored.

The control of the working environment can be represented by a system of hydraulic locks with electromagnetic control (42, 43, 44, 45) of Fig. 7. The control of a pumping unit equipped with a system of hydraulic locks with electromagnetic control (42, 43, 44, 45) can be divided according to the position of the hydraulic locks (open / closed).

The position of the hydraulic locks (42, 43, 44, 45) in the position (closed, open, closed, open), respectively, leads to the supply by the pressure pump (5) of the working medium into the internal cavity of the bellows (2), closed in its free part with a plug ( 15). Overpressure builds up in the body (1), causing the suction valve (3) to close and the discharge valve (4) to open. Simultaneously, as the working medium is forced into the internal cavity of the bellows (2), closed in its free part by a plug (27), the pumped medium (25) rushes into the injection line (17). At the same time, the working medium is pumped out by a pump for pumping out (6) from the internal cavity of the bellows (12), closed in its free part by a plug (27).

After the bellows (2), closed in its free part by a plug (15), reaches the extreme stretched state, together with the reached extreme compressed state of the bellows (12), closed in its free part by a plug (27), hydraulic locks (42, 43, 44 , 45) switches to position (open, closed, open, closed). The process is mirrored.

Differences of the claimed technical solution.

A bellows is used as a working body. The deformation of the bellows occurs along the axis of the bellows, which makes it easy to control the operating positions of the bellows. The bellows also has a large variable volume per stroke with minimal dimensions.

The change in the working volume occurs due to the longitudinal compression-stretching of the bellows. There are no radial tensile stresses on the bellows, which allows the use of reinforced bellows, which in turn increases pump life.

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Claims (8)

The housing is made with inlet and outlet openings. The inlets in the housing of the pumping unit in the embodiment of the claimed technical solution are located in the lower or upper part of the housing. In this case, the outlet openings in the embodiment of the claimed technical solution are located in the upper or lower part of the housing. Compression-expansion of the bellows is carried out by alternately connecting the working cavity of the pumping unit to the lines with the working fluid, in one of which the pressure is higher than the pressure of the pumped medium at the inlet to the pumping unit, in the second - lower. CLAIM 1. Pumping unit, including a housing made with at least two parts with internal cylindrical cavities, with holes for inlet and outlet of the pumped medium, at least two longitudinally deformable bellows, each of which is fixed inside each part of the housing with one end surface to one inner end surface of each part of the body, while the opposite end side of each bellows is made with a plug, and on the end surface of each part of the body, connected to the bellows, there is a hole for supplying the working medium into the internal cavity bounded by the bellows, its plug and the end surface of the part housing, a hydraulic control system of the pumping unit, characterized in that the hydraulic control system of the pumping unit is made in the form of a tank with a working medium, an injection pump, at least two independent hydraulic lines and a valve system configured to alternately connecting the internal cavities of the bellows with the working fluid to the first or second line, depending on the positions of the bellows, while the hydraulic lines are designed in such a way that in one line the pressure of the working medium is less than the pressure of the pumped medium at the inlet to the pumping unit, and in the second line the pressure of the working medium medium is greater than the pressure of the pumped medium at the inlet to the pump unit, wherein the internal cavity of each bellows is connected by lines with the possibility of alternate switching with the pressure pump for supplying the working medium through the first hydraulic line, and with the tank with the working medium through the second hydraulic line, and the pump unit additionally comprises means for controlling the position of each bellows, configured to control the alternate connection of the internal cavity of the bellows with the working fluid to the first or second line, depending on the positions of the bellows. 2. The pumping unit according to claim 1, characterized in that the means for monitoring the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a fixed tube and a rod, while one end of the rod is attached to the bellows plug, and the other end of the rod is freely placed in the tube located on the side opposite from the end surface of the bellows with a plug, and on the tube, at a distance of the bellows travel, rod position sensors are installed. 3. Pumping unit according to claim 1, characterized in that a pump is additionally installed on the second hydraulic line for pumping the working medium into the tank. 4. The pumping unit according to claim 1, characterized in that the means for monitoring the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a position sensor in conjunction with a rod and a tube, while one end of the rod is attached to the bellows plug, and the other end The rod is freely placed in the tube located on the side opposite from the end surface of the bellows with a plug, while the rod positions are marked with marks. 5. The pumping unit according to claim 1, characterized in that the means for monitoring the position of each bellows is installed in the internal cavity of each bellows and is made in the form of a sensor and a coil with a cable, made with the possibility of rotation, while the coil is placed on the side opposite the end surface of the bellows with a plug, and the cable is fixed at one end to the plug. 6. Pumping unit according to claim 1, characterized in that the means for monitoring the position of each bellows is made in the form of a speed sensor installed on the pressure pump, configured to control the filling of the internal cavity of the bellows by determining the volume of the working medium necessary to fill the internal cavity of the bellows . 7. Pumping unit according to claim 1, characterized in that the holes for supplying and discharging the pumped medium are made in the lower and/or upper part of the housing. 8. Pumping unit according to claim 1, characterized in that the bellows is made up of separate deformable membranes connected in series with each other by end surfaces. -