JPH0122480B2 - - Google Patents

Abstract

1. A method for operating a water-jet pump, in which the water required for operating the pump is recirculated in a circuit, characterised in that the water is pressurized by means of compressed air at an essentially constant air pressure and that compressed air, which was used to expel water through the water-jet pump, is expanded in a defined expansion chamber, heat being with-drawn from the water and absorbed by the air during and after its expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water pump operating method for circulating operating water necessary for operating the water pump in a water pump operating circuit, and an operating device for implementing this operating method.

Water pumps are widely used, for example in laboratories, for example to dry substances or to vaporize solutions at low temperatures, thereby avoiding heat loads on the substances to be treated. Water pumps have the advantage of being very simply constructed, being virtually wear-free and, if customarily made of glass or plastic, being corrosion-free. According to the water pump, mercury column 100mm~15
Vacuum in the mm range can be easily generated,
This is sufficient for many experimental purposes.

However, they have the disadvantage of relatively high operating costs compared to mechanical pumps, such as rotary pumps. This is because the amount of water consumed during operation is significantly large. Typical consumption is, for example, 0.8
m ³ /h and therefore consumes 8 m ³ of operating water in 10 hours of operation. Even if we ignore the cost, such high water consumption is not desirable from the viewpoint of environmental resource protection. For this purpose, an electric circulation pump is used, which pumps the operating water discharged from the water pump again under pressure and supplies it to the operating water connection of the water pump. The pressure exerted by the circulation pump depends significantly on the temperature of the operating water. This is because this pressure cannot be lower than the operating water vaporization pressure, which increases the higher the temperature of the operating water. However, the operating water is heated relatively quickly in the circulation circuit, and as a result, the suction force of the water pump becomes lower than when fresh water is continuously supplied as the operating water. To reduce the operating water temperature, the operating water must be cooled with a special cooling device. This requires significantly higher installation costs, including different electrical installation costs.

The object of the invention is to improve the operating method mentioned at the outset, to eliminate the need for electrical equipment and to provide cooling of the operating water, and to provide a device for carrying out this method.

According to the invention, this problem is achieved by supplying the operating water of the water pump to the water pump from one delivery tank of at least two delivery tanks, in which case the operating water in the delivery tank is kept approximately constant by means of pressurized air. After pressurizing with air pressure and pushing out the operating water from one of the delivery tanks, the pressurized air in the delivery tank is guided into the expansion tank to expand the pressurized air in the expansion tank, and the air expands the expansion tank. The solution is to remove heat from the operating water through the expansion tank and exhaust the air that has absorbed this heat from the expansion tank.

Instead of a circulation pump, pressurized air (compressed air) is used in the present invention to circulate the operating water. In today's laboratories, pressurized air lines are generally installed in the workplace, to which operating equipment can be connected, so that there is no need to provide a special compressor for obtaining pressurized air. According to the invention, the pressurized air is not expanded during the delivery of operating water from the delivery tank, and a constant water pressure always acts on the water pump, so that the suction force is also kept constant. Once the pressurized air fulfills its operating water pumping function, it is used according to the invention to cool the operating water to be circulated. If the pressurized air, which still has a high pressure after pumping the operating water from the delivery tank, expands, it is strongly cooled. This cooling is used to remove heat from the operating water. The temperature of the circulating water can therefore be kept low without the use of special cooling devices, and therefore, as can be seen above, the required pressure can be kept low. Furthermore, the cooled operating water is guided through sections with a cooling temperature drop in the secondary circuit. This usually requires fresh water. Since the circulation of the operating water and the cooling of the operating water are carried out by means of pressurized air, no electrical equipment is required. This is particularly advantageous for laboratories.
This is because electrical equipment must be specially protected against moisture.

The invention can, of course, also be practiced where other liquids than water are used for water pump operation and other gases than air are used to deliver the liquid. The use of other liquids and gases may be necessary if special problems exist.

According to the description in claim 2, heat is removed from the operating water by flowing the operating water around the expansion tank, in short, by disposing the expansion tank in the operating water filling part of the outer container. By this,
It will be done. However, particularly good cooling effects are achieved if, as claimed in claims 3 and 4, the expanding air is brought into direct contact with the operating water to be cooled. This is easily achieved by injecting the operating water into the expansion tank by means of a nozzle, in which case the operating water is dispersed into fine droplets by the expanding air.

According to the method recited in claim 5, continuous operation of the water pump is possible. This is because in this case one delivery process can be immediately connected to the next delivery process, without having to wait until the delivery tank is filled with operating water.

The apparatus according to claim 6 is an apparatus for carrying out the method of the present invention, and the apparatus according to claim 7
Items 2 to 20 describe advantageous embodiments of the device according to claim 6.

When the delivery tank and the expansion tank are arranged in the outer container as described in claim 7, there is an advantage that no conduit is required. This is because the delivery tank is filled with operating water directly from the outer container. When a check valve, in particular a valve flap according to claim 8, is used, the static pressure of the operating water in the container causes the filling of the operating water into the delivery tank, whereby the delivery tank is filled with operating water. Special means for filling with water can be omitted. Claims 9 and 10 describe particularly simple means for connecting the delivery tank alternately to a water pump. If one of the delivery tanks becomes unpressurized, claim 1
The piston according to item 0 is quickly moved by the pressure in the other tank, so that the empty delivery tank is closed and the pressurized tank is connected to the water pump.

In order to make the explanation easier to understand, only one water pump has been described above.
It is also possible to connect several water pumps to the operating device. The operating device is advantageously designed to be suitable for operating two to four water pumps.

According to the arrangement of the riser pipe according to claim 11 and the pressure air supply means according to claim 12, the operating water can be delivered without the risk of the pressurized air for delivering the operating water flowing into the water pump. Can be sent. However, it is also possible to adopt an arrangement format different from the above arrangement format, and
It is also possible to discharge the pressurized air for delivery of the operating water below the water surface.

According to the switching device described in Claims 13 and 14, it is possible to automatically and continuously operate a device that continuously supplies operating water to a water pump by extremely simple means. .

Pressure air can be easily controlled by a rotating spool. However, it is also possible to use other types of valves. Claim 16
The configuration of the operating device can be made particularly simple by having only one rotary spool controlling the supply of pressurized air to the delivery tank and from the delivery tank into the expansion tank, as described in Section 1. can. For actuation of the rotary spool, it is also possible to use a switching piston as claimed in claim 13, as claimed in claims 17 and 18.

A particularly advantageous constructional form is obtained by configuring the control device in a control plate, which also serves to secure the tank in the outer container, as claimed in claim 19.

It is advantageous to arrange the water pump or pumps on the wall of the container as claimed in claim 20. This is because in this way a conduit for returning the operating water can be omitted. However, it is also possible to arrange the water pump at another location and to return the water via a conduit, for example a hose.

The alternating filling and emptying of operating water into the delivery tank can be controlled in relation to time, with the result that after a predetermined, advantageously adjustable time period, one delivery tank is drained from the other. A switchover to the delivery tank is possible, in which case the switching time interval mentioned above can be chosen such that the switchover always takes place before the delivery tank being drained is completely empty.

When the expanding pressurized air is brought into direct contact with the operating water by the method described in claim 4,
It is advantageous to use the device according to claim 21. By arranging the expansion tank above the operating water filling height and arranging the discharge section for operating water and expansion air at the lowest point of the expansion tank, water can be prevented from accumulating in the expansion tank.

If, as claimed in claim 23, the operating water is introduced at right angles to the expanding pressurized air, a particularly strong and therefore effective contact between the cooled air and the operating water is achieved. be done. In this case, the air flow disperses the operating water into fine droplets. Atomization of the operating water occurs even when it is injected into the expansion tank, and is also promoted by impingement on the solid walls of the tank. The cooling effect within the expansion tank is significantly improved by installing baffles as claimed in claim 24. Furthermore, such a baffle plate can also provide a sound deadening effect.

The invention will now be explained with reference to the illustrated embodiment.

The main components of the operating device are a container 1, two delivery tanks 2, 3, an expansion tank 4, a rotary spool 5 for pressure air control having a switching device, generally designated by the reference numeral 6, and a switching device for switching the water guide direction. A piston 7 and two water pumps 8,9. These main components, other components, and interactions between these components will be described in detail below.

As shown in FIG. 1, the container 1 has a rectangular shape in a plan view, and has a relatively large height (depth) with respect to this rectangle (second
figure). The container 1 can be made of plastic, for example. At the bottom of the container there are strip-shaped parts 10, 11.
and 12 are formed, on which are mounted the tanks 2, 3 and 4, so that these tanks are at some distance from the bottom 13 of the container 1. As shown in FIG. 3, near the bottom surface 13 there is a drainage hole 14, which is closed with a plug 15.

The delivery tanks 2 and 3 are cylindrical and are closed on the upper side with a ceiling 16 and on the lower side with a screwed bottom 17. Both tanks are made identically, so only tank 2 will be described.

In the bottom part 17 there is a large hole 18, which is closed with a valve flap 19. The valve flap is pivotable about a horizontal axis 20 and has a packing 21. A thin lip 22 surrounding the bore 18 serves as a sealing seat for the valve flap 20.

A float 23 is arranged in each tank 2, 3 and is movable up and down within a cage 24. The cage 24 has a hole 24a, so that the interior of this cage communicates with the cylindrical interior chamber 25 of the delivery tank 2. Above the float 23 is a valve plate 26.
, which cooperates with the valve seat 27, and this valve seat is
It is formed at the lower end of a control conduit 28 which passes through the ceiling 16 and leads into the interior chamber 25 of the delivery tank.

The expansion tank 4 is made of a material with good thermal conductivity, such as stainless steel, and has fins 4a (Fig. 7) on its outer periphery.
have. Baffle plates 29, 30 are disposed inside the expansion tank 4, which forcibly divert the air flowing into the expansion tank 4 to produce a noise reduction effect.

A discharge pipe 31 projecting upward is arranged on the ceiling of the expansion tank 4. Expanding air is forcibly guided by a built-in baffle plate, and the expansion tank 4
first flows downward, then upward.

Tanks 2, 3 and 4 are secured within the vessel by a control plate, generally designated 32. This control board 32 is placed on the upper side of the tanks 2, 3, 4, and the fixing members 33, 34 (third
(Fig.) to ensure that it does not lift.
Different holes are machined in this control plate. Furthermore, the already mentioned rotary spool 5 for controlling the compressed air is mounted in the control plate (FIG. 2).
Furthermore, the control plate has a switching piston 7, as shown in the sectional view in FIG.

The rotary spool 5 is a cylindrical body in which there are two L-shaped passages 35, 36 which are axially separated from each other (FIGS. 5 and 6). In the control plate 32, there are three passages 37 at the level of the L-shaped passage 35,
38 and 39 are arranged. The passage 38 has a vertical section 38a, which extends to a pressurized air connection 40. The channel 37 extends from the bore 41, in which the rotary spool 5 is supported, through a vertical section 37a to the delivery tank 2. The passage 39 is symmetrical to the passage 37 and extends into the delivery tank 3.

In the position of FIG. 5, the pneumatic connection 40 is connected to the delivery tank 3. When the rotary spool 5 is rotated through 90 degrees clockwise, the delivery tank 2 is connected to the pneumatic connection 40 .

In the plane containing the L-shaped passage 36, there are three passages 42, 43, 44 in the control plate. In the position of FIG. 6, the delivery tank 2 has vertical sections 42a, passages
2. It is connected to the expansion tank 4 via an L-shaped passage 36 in the rotating spool 5 and a passage 44 which also has a vertical section 44a. When the rotating spool 5 rotates through 90 degrees, the connection between the delivery tank 2 and the expansion tank 4 is interrupted, and the delivery tank 3 is connected to the expansion tank 4 instead.

As can be seen from Figure 2, passages 37, 39, 4
2, 43 are in the same plane, and therefore the said vertical sections are also in the same plane. These passage vertical sections are aligned with the holes 45 in the end face 16 of the delivery tank.
Below these holes there are valve balls 46, which are made of a material with a specific gravity lower than that of water and which are each guided in cages 47, which cages have transverse holes 47a. .

Rising pipes 48, 49 are arranged within the delivery tanks 2, 3 (FIG. 4). These riser pipes 48,
49 reaches the bottom 17 and has a taper 48a at the end. The riser pipes 48 and 49 open at the ceiling of the delivery tank and are connected to L-shaped passages 50 and 51 in the control board 32. The L-shaped passage opens axially into a cylinder 52 in which the piston 7 is movable. At both ends of the cylinder 52 there are valve seats 53, 54, on which the piston 7, which also serves as a valve body, rests with its sealing edges 7a, 7b. A hole 55 opens radially in the center of the length of the cylinder 52, and extends to the edge of the control panel 32, as shown in FIG. Connected to the hole 55 is a conduit 56 which has two conduits 57, 58 at its ends.
These are divided into 59 and 60 Kotoku. The conduits 57, 58 lead to water pumps 8, 9, which have suction conduit connections 8a, 9a, to which the containers to be evacuated are connected, for example via flexible tubes. Ru.

There are two cylinders 61 and 62 on the control board 32.
(FIG. 3) are mounted, and the control conduit 28, which is the previously mentioned pressure air conduit, opens into these cylinders at the ends of the cylinder holes 61a, 62a. A rod 63 extends between the cylinders 61 and 62, and both ends of the rod 63 are connected to the piston 6.
4 and 65, and these fit into the cylinder holes 61a and 62a. In the center of the rod is a recess 66 into which engages an arm 67 (FIG. 1), which arm is fixedly connected to and extends radially from the rotary spool 5. It stands out.

The working format of the operating equipment is as follows.

When operating the device, mark the level mark 68 inside the container 1.
The water will be filled up to (Figure 3). A pressurized air connection 40 for supplying pressurized air is connected, for example, to a pressurized air conduit (not shown) installed in the laboratory. In this case, a pressurized air tank (not shown) located in front (upstream) of this pressurized air connection 40 remains closed. Suction conduit connection 8a of water pumps 8 and 9
and 9a, the container to be evacuated is connected. The device begins to operate when at least one of the sockets 59, 60 is opened and the pressurized air socket located in front of the pressure air connection 40 mentioned above is opened.

When the container 1 is filled with operating water, the delivery tanks 2 and 3 are also filled with operating water. This is because the valve flap 19 is opened by the static pressure of the operating water. When the connection passage to the expansion tank 4 is opened,
For example, if the delivery tank 2 is connected to the expansion tank 4 in the valve position of FIG. 6, then the air in the delivery tank 2 will escape and the delivery tank 2 will be completely filled with water. Entry of water into the air passage is prevented by a valve ball 46. This valve ball 46 floats in the water and is pressed into a hole in the ceiling 16.

The other delivery tank, ie, the delivery tank 3 which cannot be evacuated in this case, is not completely filled with operating water because air remains inside.

By the way, if the valve position is set to supply pressurized air into the delivery tank 2, contrary to the illustrated position in FIG. is sent upwardly via riser 48 (FIG. 4). This water pressure is piston 7
is pressed against the valve seat 54 on the right side in FIG. 4, thereby closing the riser pipe 49 of the other delivery tank. The operating water passes through the hole 55 to the water pump 8,
Flows to 9. The operating water injected from the water pump falls directly into the container 1 again.

By the way, when the water level in the delivery tank 2 falls and the float 23 (Fig. 3) descends, the control conduit 2
8 is opened and pressurized air, for example 2 atmospheres, flows into the cylinder 61, whereby the rod 63 is pushed to the right in FIG. As a result, the rotating spool 5 is rotated 90 degrees,
This results in the connection states shown in FIGS. 5 and 6. In this position, the pressurized air flowing in via the pressurized air connection 40 is guided into the delivery tank 3;
The water surface within the delivery tank 3 is pressed. The operating water is sent upwards in the riser pipe 49, in which case the sealing edge 7a is pressed against the valve seat 53, so that the riser pipe 4
8 will be closed. In this state, operating water is sent from the delivery tank 3 to the water pumps 8 and 9 via the hole 55.

At the same time, the delivery tank 2 and the expansion tank 4 are connected via passages 42, 36 and 44, as shown in FIG. The pressurized air, which still has a total pressure of 2 atmospheres during the switching operation (no expansion of the pressurized air takes place during delivery), expands in the expansion tank 4, in which case a strong cooling of the air occurs. Air noise is attenuated by the silencing effect of the expansion tank 4. The cooled air removes heat from the operating water flowing around the tank 4, thereby keeping the operating water at a low temperature. The expanded air is discharged through the discharge pipe 31.

When the water level in the delivery tank 3 decreases and the float 23 in the tank lowers, pressure is applied to the cylinder 62 and the rod 63 is pushed to the left in FIG. 3, after which it returns to the state described at the beginning. occurs. In short, operating water is sent out by pressure air from one delivery tank, and the other delivery tank is used for container 1.
It is opened under the influence of static pressure within the tank and is filled with operating water via the valve flap 19 at its bottom.

If operation is to be interrupted for a short time, it is sufficient to close the kettle. In the case of relatively long outages, it is advantageous to also cut off the pressurized air supply.

To empty the operating device, remove the faucet 15 during operation. In this case, the pump stroke of the cylinder automatically becomes an empty stroke. Connective operational water exchange is not required.
This is because the operating water is constantly cooled. However, since contamination of the operating water inevitably occurs, it is advantageous to replace the operating water, for example approximately 25 times a day.

In the embodiments shown in FIGS. 8 and 9, the entire reference numeral 7
The expansion tank, marked 0, is placed horizontally above the water surface. Expansion tank 70 is a cylindrical tank, which can be made of metal. A perforated thin plate 71 is disposed within the expansion tank 70, some of which is illustrated in FIG.

Connected to the right-hand end of the expansion tank 70 is a working water conduit 72, which branches off from the pressure conduit 56 leading to the water pump. The operating water conduit 72 opens into the expansion tank 70 by a nozzle 73 . The injection direction of the nozzle 73 is downward at right angles to the longitudinal direction of the expansion tank 70.

Air leaving the delivery tanks 2, 3 is led into the expansion tank 70 via a conduit 74. The conduit 74 has an outlet hole 74 a whose axis extends parallel to the longitudinal direction of the expansion tank 70 and extends toward the water nozzle 73 .
The nozzle 73 extends below the nozzle 73 and is arranged slightly to the right of the nozzle 73 .

The apparatus of FIGS. 8 and 9 operates in substantially the same manner as the apparatus of FIGS. 1-7. The only difference is that
Operating water is introduced into the expansion tank 70. The operating water is injected under pressure and is divided into small pieces by impinging on baffles. Furthermore, fragmentation and distribution within the entire expansion tank takes place by impingement with the air exiting from the outlet hole 74a of the air conduit. The operating water is distributed onto the perforated plate 71, which is covered with a water film. The operating water is discharged from the tank 70 through a discharge pipe 75 together with air. The opening 75a of the discharge pipe 75 opens downward above the water level 76 in the container. In effect, the water level 76 in this embodiment is somewhat lower than in the embodiment of FIGS. 1-7. The horizontal portion 75b of the discharge pipe 75 is connected to the lowest point of the wall of the expansion tank 70 to prevent operation water from accumulating in the expansion tank 70.

According to the operating method and operating device of the present invention, during the expansion of the compressed air in the expansion tank 4, the compressed air is strongly cooled due to the Joule-Thomson effect, but this cooling effect is initially depends on the pressure. An initial pressure of 3 bar gives a cooling of 12°C, whereas an initial pressure of 7 bar gives a cooling of 20°C.

The expansion takes place in an expansion tank with good thermal conductivity and good heat exchange properties, and in this case the operating water is injected into the expansion tank, so that the injected operating water comes into direct contact with the cold air. If so, the operating water can be cooled even more significantly.

The degree of cooling of the operating water depends not only on the amount of pressurized air charged, in other words on the number of water pumps in operation and their nozzle diameters, but also on:
It also depends on the operating water temperature, outside air temperature, and the insulation properties of the outer container 1. Empirically, 50 liters of operating water at a temperature of 20°C, with a pressure air pressure of 6 bar, a pressure air charge of 3.6 m ³ , a room temperature of 20°C, a plastic outer container 1
with a wall thickness of 10 mm and a cooling time of 5 to 6 hours to 11°C to 12°C.

[Brief explanation of drawings]

The drawings show two embodiments of the present invention; FIG. 1 is a plan view of the first embodiment of the operating device of the present invention;
2 is a sectional view taken along the - line in FIG. 1 and includes a cross section of the pressure air control spool; FIG. 3 is a sectional view taken along the - line in FIG. 1 and includes a cross section of a switching device for switching the pressure air guide passage; 4 is a sectional view taken along the - line in FIG. 1 and includes a cross section of the switching device; FIG. 5 is a horizontal sectional view taken along the - line in FIG. 2 and includes a cross section of the air passage for supplying pressurized air to the delivery tank. 6 is a sectional view including a cross section of the passage supplying pressurized air from the delivery tank to the expansion tank, taken along the - line in FIG. 2; FIG. 7 is a sectional view taken along the - line in FIG. 2, and FIG. The figure is a view corresponding to FIG. 1 of the second embodiment in which the expansion tank is arranged above the operating water level, and FIG. 9 is a view corresponding to FIG. 4 of the embodiment of FIG. 8. . DESCRIPTION OF SYMBOLS 1... Container, 2, 3... Delivery tank, 4... Expansion tank, 5... Rotating spool, 6... Switching device, 7... Switching piston, 7a, 7b... Seal edge, 8, 9 ...Water pump, 8a, 9a...
Suction conduit connection portion, 10, 11, 12... Strip-shaped portion, 13... Bottom surface, 14... Drain hole, 15...
Plug, 16...ceiling, 17...bottom, 18...hole,
19... Valve flap, 20... Shaft, 21... Packing, 22... Edge, 23... Float, 24...
...cage, 24a...hole, 25...inner chamber, 26...
... Valve plate, 27 ... Valve seat, 28 ... Control conduit, 2
8'...Fin, 29,30...Baffle plate, 31...
...Discharge pipe, 32... Control board, 33, 34... Fixing member, 35, 36... Passage, 37, 38, 39...
...Aisle, 37a, 38a...Vertical division, 40...
Pressure air connection, 41... hole, 42, 34, 44
... Passage, 42a ... Vertical section, 44a ... Vertical section, 45 ... Hole, 46 ... Valve ball, 47 ... Cage, 47a ... Horizontal hole, 48, 49 ... Rising pipe, 4
8a... Taper, 50, 51... Passage, 52...
...Cylinder, 53, 54... Valve seat, 55... Hole,
56... conduit, 57, 58... conduit, 59,60
...Kotuku, 61, 62...Cylinder, 61a,
62a...Cylinder hole, 63...Rod, 64,
65... Piston, 66... Recess, 67... Arm, 70... Expansion tank, 71... Porous thin plate, 7
2... Operating water conduit, 73... Nozzle, 74... Conduit, 74a... Outlet hole, 75... Discharge pipe, 76...
...Water surface.

Claims (1)

[Scope of Claims] 1. In a method of operating a water pump in which operating water necessary for operating the water pump is circulated within a water pump operating circuit, the operating water of the water pumps 8, 9 is supplied to at least two delivery tanks 2, 3. In this case, the operating water in the delivery tanks 2 and 3 is pressurized by pressurized air at a substantially constant air pressure, and one of the delivery tanks 2 and 3 is supplied to the water pumps 8 and 9 from each delivery tank. After the operating water is pushed out and sent out, the pressurized air in the delivery tanks 2 and 3 is introduced into the expansion tank 4, and this pressure air is expanded in the expansion tank 4. A method of operating a water pump, which is characterized in that the air that has absorbed heat is removed from the expansion tank 4 and the air that has absorbed this heat is discharged from the expansion tank 4. 2. The operating method according to claim 1, wherein operating water is supplied to the outer peripheral wall of the expansion tank and pressurized air is expanded within the expansion tank. 3. The operating method according to claim 1, wherein the pressurized air is brought into direct contact with the operating water during its expansion. 4. The operating method according to claim 3, wherein pressurized air and operating water are introduced into the expansion tank to expand the pressurized air within the expansion tank. 5 Alternately filling at least two delivery tanks with pressurized air, sending operating water from the delivery tank during filling with pressurized air to a water pump, and while filling one delivery tank with pressurized air, discharging water from the other delivery tank. The operating method according to claim 1, wherein pressurized air in the tank is expanded in an expansion tank. 6 At least 2 times the operating water of the water pumps 8 and 9
The water pumps 8 and 9 are supplied from each of the two delivery tanks 2 and 3, and in this case, the operating water in the delivery tanks 2 and 3 is pressurized by pressurized air at a substantially constant air pressure, and the water is sent out. Tank 2, 3
After extruding and sending out the operating water from one of the pumps, the pressurized air in the sending tanks 2 and 3 is guided into the expansion tank 4, and the pressurized air is expanded in the expansion tank 4,
A water pump that uses the air to remove heat from the operating water through an expansion tank, and discharges the air that has absorbed this heat from the expansion tank 4. The water pump circulates the operating water necessary for operating the water pump in the water pump operating circuit. In the operating device for implementing the operating method, at least two delivery tanks 2, 3;
3 to the water pumps 8 and 9.
8, 49, 52, 55, 56, 57, 58, at least one expansion tank 4 for expanding pressurized air, and pressurized air passages 42, 43, 44 connecting the delivery tanks 2, 3 to the expansion tank 4; A pressure air connection 40 for supplying pressurized air, pressure air passages 37, 39 connecting the pressure air connection 40 to the delivery tanks 2, 3, and operating water passages 48, 49, 5.
2, 55, 56, 57, 58 and alternately connects the delivery tanks 2, 3 to the high pressure sides of the water pumps 8, 9;
3 to the operating water discharged from the water pumps 8, 9 and alternately connecting the delivery tanks 2, 3 to the pressurized air connection 40, on the one hand;
on the other hand, one or more pressurized air valves 5 which alternately connect the delivery tanks 2, 3 to the expansion tank 4;
An operating device for a water pump, characterized in that the pressure air valve 5 isolates the delivery tanks 2, 3 connected to the pressure air connection 40 from the expansion tank 4. 7 Sending tanks 2, 3 and expansion tank 4 are container 1
The container is located in the delivery tank 2, 3.
The discharge side of the water pump opens into the container 1, and each delivery tank 2, 3 can be filled with operating water.
7. Device according to claim 6, characterized in that it has in its bottom a hole (18) which is connected to the interior of the container (1) and is closable by a second water valve (19). 8. A device according to claim 7, wherein said second water valve is constructed as a check valve. 9. Device according to claim 6, in which the first water valve 7 is controllable by operating water leaving the delivery tank. 10 Piston 7 sliding within control cylinder 52
In this case, operating water passages 50 and 51 are opened on both end surfaces of the control cylinder 52, and the operating water passages extend to the delivery tanks 2 and 3, and furthermore, another operating water passage is opened on the side of the control cylinder. A water passage 55 is open, and the operating water passage 55 is connected to the water pumps 8 and 9.
The water passage 50 extends toward the high-pressure side of the control cylinder 52 and is open to both end faces of the control cylinder at both end positions of the piston 7 within the control cylinder 52;
10. The device according to claim 9, wherein one side of the operating water passage 51 is closed and the operating water passage 55, which opens on the side surface of the control cylinder, is open. 11. Apparatus according to claim 6, in which riser pipes 48, 49 are arranged in the delivery tank, the riser pipes opening into the delivery tank near the bottom of the delivery tank. 12. The device according to claim 6, wherein the pressure air passages 37, 39 for introducing pressurized air into the delivery tanks 2, 3 open into the delivery tanks in the upper region of the delivery tanks. 13 It has a switching piston 63 that can be operated by the pressurized air in the delivery tanks 2 and 3, and the switching piston 63 is operated after the operating water in one delivery tank is delivered and the delivery tank is emptied. 7. Apparatus as claimed in claim 6, in which the pressurized air supply is switched to the other delivery tank and the delivery tank, which has been emptied of operating water, is connected to the expansion tank. 14 One float valve 23 is arranged near the bottom of each delivery tank 2, 3, which float valve extends to one side of the double-acting switching piston 63 when the float is in operating water. 14. Apparatus according to claim 13 for closing the pressurized air passage. 15. Device according to claim 6, in which the pressure air valve 5 is constructed as a rotating spool. 16 Both pressure air valves are one rotary spool 5
in which the rotary spool has in a first plane a bore 35 for a first pressure air valve and a second plane located axially apart from said first plane. The plane has a hole 36 for the second pressure air valve, and the holes 35 and 36 are
Holes 38, 37, 39 in the rotating spool casing 32, also arranged in two different planes; 4
Claim 15 cooperating with 2,44,43
Apparatus described in section. 17. Device according to claim 16, in which the rotary spool 5 is actuatable by a switching piston 63. 18 A radially projecting pin 67 is arranged on the rotating spool 5 and is connected to the control piston 6
Claim 1 connected to the switching piston 63 by engaging in the slit 66 of 3.
The device according to item 7. 19 has a control plate 32, and the control plate 32
is mounted on the delivery tank 2, 3 and the expansion tank 4 and fixed against lifting, and has a pressure air valve and an associated pressure air line. Apparatus described in section. 20. Device according to claim 7, in which the water pumps 8, 9 are arranged on the wall of the container 1 and the operating water is injected directly into the container. 21 The expansion tank 70 is arranged above the water level 76 and the at least one operating water passage 72
is connected to at least one delivery tank, and the expansion tank 70 has an outlet hole 75 for discharging the operating water-air mixture, which is arranged at the lowest point of the expansion tank.
Apparatus described in section. 22 Outlet hole 75a for discharging the operating water-air mixture
22. Apparatus according to claim 21, wherein the is located above the water level 76 of the container. 23. A nozzle 73 is provided for introducing operating water into the expansion tank 70, and the jetting direction of the nozzle is inclined with respect to the axis of the air outlet hole 74a. Device. 24. The device according to claim 6, wherein a baffle plate 71 is disposed within the expansion tank 70.