HU208568B - Apparatus for controlling fluid pumps - Google Patents

Abstract

The present invention relates to a device for controlling liquid pumps in a reservoir or reservoirs, to maintain an appropriate fluid level, which comprises a pump and at least one reservoir connecting the reservoir and a pressure stop switching the pumps, wherein the pressure pipe is connected to the reservoir by a float-controlled shut-off valve arranged in the reservoir and the pressure switch with a shock absorber connected to the pressure pipe. is related. The shut-off section (46) is a hollow body separated by a valve seat (6), the lower space of which is connected to the pressure pipe (43), and the upper part is connected to the reservoir (3a, 3b) and in the lower space with the seat (6) cooperating in the container (6). 3a, 3b) has a movable body (5) moved by a float (4a, 4b), a diaphragm housing (12) is mounted between the damping vessel (15) and the pressure pipe (43), the lower space (34) of which is connected to the pressure pipe (43) and the upper space (35) with the shock absorber vessel (15) is hydraulically connected by an antifreeze fluid (36). Figure 1 EN 208 568 B Scope of the description: 6 pages (including 2 sheets)

Description

(57) EXTRAS

The invention relates to an apparatus for controlling fluid pumps in a reservoir or reservoirs for maintaining a suitable fluid level having a pipe connecting the pumps and at least one reservoir and a pressure switch for stopping the pumps, wherein the pressure pipe is connected to the reservoir related.

The shut-off section (46) is a hollow body separated by a valve seat (6), the lower space of which is connected to the discharge pipe (43) and its upper part is connected to the reservoir (3a, 3b). 3a, 3b) is provided with a closing body (5) movable by a float (4a, 4b), a diaphragm housing (12) is inserted between the shock absorber vessel (15) and the pressure pipe (43), its lower space (34) connected to the pressure pipe (43) and its upper space (35) is hydraulically connected to the shock absorber vessel (15) via an antifreeze communication fluid (36).

Figure 1

HU 208 568 B

Description: 6 pages (including 2 pages)

HU 208 568 Β

The present invention relates to an apparatus for controlling fluid pumps in a reservoir or reservoirs for maintaining a suitable fluid level having a discharge pipe connecting the pumps to the at least one reservoir and a pressure switch for stopping the pump.

As is well known, it is a common task to keep water levels within certain limits in reservoirs such as water towers. Reservoirs, such as water towers, are filled with water by means of pumps from a water source such as a well. Different reservoirs are used to control the water level in the reservoirs. One known solution is to place level switches in the reservoirs, which stop the water-producing pumps by a cable connection when they reach the appropriate water level and restart when the water level falls below a certain level. However, this solution has very significant disadvantages. On the one hand, in very many cases, the distance between the water reservoir and the pump is very large, which means that very long cables can be used. which is very expensive. In addition, finding a fault in the event of a cable failure is a serious problem. This solution also has the difficulty of changing the position of the level switches.

Wireless solutions are also known, which use radio transmitters to detect the water level and to operate the pumps using radio transmitters. However, these solutions are very costly and often uneconomic. In the event of a breakdown, they require highly qualified technicians, and even maintenance.

Solutions are known where a change in pressure is detected and used to control the pumps. However, with this solution, the variable pressures caused by the mains consumption can no longer be monitored for many reservoirs and, in the case of high-inflow reservoirs, they are essentially unsuitable for sensing the switch-on level.

No. 166588. A device for controlling liquid pumps for maintaining a liquid level in a reservoir is known from the Hungarian patent. However, the equipment described in this specification may only be used with lower inlet reservoirs. The disadvantage of the system is that the sensing pressure limits are extremely tight, which causes frequent overflow of the reservoir or delayed start-up of the pump, which causes the reservoir water level to fall below the required minimum. This may be because the time relay delaying the trigger of the switch pressure sensor and the small air bag closed with mercury are not working properly. Likewise, the exact pump start-up described in No. 166677 does not guarantee correct starting. equipment known from the Hungarian patent specification. Again, the water level in the reservoir may fall below the desired minimum value and overflow may occur.

A further problem with certain known devices is that the electrical components in the explosion-proof spaces of the pumps, or in the case of pumps.

are placed in mines and can therefore only be used in explosion-proof designs. This will greatly increase the investment costs.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the aforementioned shortcomings of the known equipment and to provide a device for controlling the liquid level in reservoirs which, by a very simple design, enables the pump to start and stop at the required time without cable and radio connection. It is a further object of the present invention to make the apparatus applicable to both lower and upper inlets and combinations thereof.

The invention thus relates to an apparatus for controlling liquid pumps in a reservoir or reservoirs having a pipe connecting the pump (s) to the at least one reservoir and a pressure switch for stopping the pumps, wherein the pressure pipe is controlled by a float associated with a shock absorber vessel. SUMMARY OF THE INVENTION The shut-off valve is a hollow body separated by a valve seat, the lower space of which is connected to the pressure pipe and the upper part of which is connected to the reservoir and the lower space includes a valve body cooperating with the valve seat and movable in the reservoir. A lower diaphragm housing is inserted between the lower space connected to the rail and the upper space hydraulically connected to the shock absorber vessel.

Preferably, the damping vessel is sealed with an adjustable-pressure air cushion above the communication fluid, and the pressure switch is immersed in the fluid compartment of the damping vessel by means of a submerged tube and a throttle is provided in the communication tube between the damping vessel and the diaphragm housing.

A preferred embodiment of the apparatus according to the invention is an adjustable time switch for restarting the pump between the pressure switch contact of the pressure switch and the contactor of the pump.

It is a preferred partial solution that the closing body of the closure assembly is secured by a hinge at the lower end of a spring-down rod while the upper end of the rod is in contact with the float. Preferably, the closure body has through holes.

The device according to the invention can be used for both lower and upper inlet reservoirs, and even when used together, for controlling one or any number of pumps. The apparatus according to the invention can also be used for stepwise operation of the pumps. In this case, the pressure sensor is called a so-called. it must be equipped with a minimum value switch, which allows the pump to be started and thus to move the pump. In this case, if the pressure in one of the pumps continues to drop during operation, the minimum pressure sensor will start the second or second pump. additional pump.

The invention will be described in detail with reference to the drawings, in which:

HU 208 568 Β

Figure 1 is a schematic diagram of an apparatus according to the invention, in the case where two pumps supply a lower inlet and an upper inlet reservoir,

Figure 2 is a larger plan view of a shut-off assembly of a device according to the invention in a lower inlet reservoir.

In the embodiment of Fig. 1, two pumps (1 and 2) are provided to supply two tanks (3a and 3b) with water. The pumps and reservoirs (43) are connected by a discharge pipe into which a non-return valve (33) is fitted. The reservoir (3a) has an upper inlet while the reservoir (3b) has a lower inlet. The pumps (1 and 2) are normally located in the pump space (37). The discharge pipe (43) is connected to the reservoir (3a) by branched pipes (7) and to the reservoir (3b) by a pipe (7a) which simultaneously serves as a supply pipe. From the reservoir (3a), a consumer pipeline (38) is branched off to which a distribution network (41) is connected. The pumps are electrically (45) connected to a contactor.

The discharge pipe (43) or the rail (43) is mounted. the branch line (7) and the line (7a) are connected to the reservoirs (3a, 3b) by means of a special shut-off device (46) which will be described in detail below. Given that the conduit (7a) is at the same time a consumer conduit, a non-return valve (9) is connected to the reservoir (3b), which allows the liquid to flow from the reservoir (7a).

The contactor of the pumps (45) or the contactor of the pumps (45). its contactors (16) are connected to a pressure switch. The pressure switch (16) has, in an exemplary embodiment, an upper pressure switch contact (17), a movable contact (18, 19) and a fixed contact (20). According to an important aspect of the invention, a timer switch (21) is provided between the pressure switch (16) of the pressure switch (17) and the contactor (45), which is adjustable.

Connected to the pressure pipe (43) is a lower space (34) of a diaphragm housing (12) divided by a shut-off valve (12) and a diaphragm (13). A shock absorber vessel (15) is connected to the upper space (35) of the diaphragm housing (12) via a communication tube (15). The upper space (35) of the diaphragm housing (12), the communication tube (14) and the shock absorber vessel (15) are filled with antifreeze communication fluid (36). The pressure switch (16) extends with the dip tube (43) into the space filled with the communication fluid (15) of the shock absorber. In the shock absorber (15) there is an air cushion (23) above the communication fluid, the pressure of which can be varied through the valve (40). A choke (22) is provided in the communication tube (14) connecting the upper space (35) of the diaphragm housing (12) and the shock absorber vessel (15).

1 shows a larger scale drawing of the shut-off assembly 46 shown in FIG. 2 is a sectional view. As shown in the figure, the shut-off valve (46) is a hollow body separated by a valve, the lower space of which is connected to the pressure pipe (8) and the upper space (3a, 3b) of the reservoir (3a). In the lower space of the barrier section (46) there is a bar (5) moved by a rod (26). In the case of the lower inlet reservoir (3b), the rod (26), as embodied in the reservoir (3b) of Figure 1, is connected by a pulling rope (27) to a float (4b) floating in the liquid in is supposed to follow its surface. In the case of an upper inlet reservoir (3a), as embodied in the reservoir (3a) of Figure 1, the rod (26) engages a float (4a) by means of a lever mechanism. Otherwise, the shut-off valve (46) operates in both cases in the same construction and in the same manner. The rod (26) is pressed downward by a spring (11) and the corresponding weight of the closure body (5) tends to hold the closure body (5) in the lower position. The closure body (5) is connected to the rod (16) by a joint (32) for proper alignment. The recessed groove (25) on the upper side of the closure body (5) is provided with a rubber ring (24) which is secured by an annular plate (44). The closure body (5) has holes (11).

The rod (26) is held by a sleeve (29). guiding, which sleeve (29) is secured to the shut-off assembly (46) by ribs (30). The outlet of the shut-off assembly (46) is in fact a free cross-section between the ribs (30).

The operation of the apparatus according to the invention is as follows: Assuming that the pump (1) is operating and the water consumption is currently less than the pumped water, the water level of the reservoir (3a and 3b) rises and the floats (4a, 4b) reach it. level (stop level) when a signal to stop is required. The ascending floats (4a, 4b) raise the closing body (5) and press it against the valve seat (6). This is achieved by the floats (4a, 4b) on a short slope, since the water flowing into the branch pipe (7) and the pipe (7a) also presses the closing body (5) upwards. The spring (11) prevents impact of the closing body (5) against the valve seat (6). The through holes (10) in the closure body (5) allow part of the inflow fluid and thus the network pressure, which results in no harmful overpressure in the pipe network.

Given that the non-return valve (9) is closed, a slight increase in pressure in the pipe system is transmitted to the diaphragm housing (12). to its lower space (34). This pressure raises the diaphragm (13) and thus the pressure (14) is transmitted to the shock absorber vessel (15). As a result, the pressure switch (17) in the pressure switch (16) closes with the contact (18) and thus the pump (1) is switched off. At the same time, as a result of water consumption, the non-return valve (9) opens in the reservoir (3b). consumption in the distribution network (41) is continuous. As a result, the water level of the reservoir (3a, 3b) decreases.

Thus, when the contact of the high pressure switch (17) and the movable contact (18) are closed, when the pump (1) is stopped, the timer (21) starts immediately, which restarts the pump (1) after a predetermined time (t,). .

If the water level in the reservoirs (3a, 3b) does not decrease, i.e. no consumption, due to a slight increase in pressure, the high pressure switch contact (17) and the movable contact (18) will close again and stop the pump (1). ) will restart over time.

HU 208 568 Β

If the water level of one of the reservoirs (3a or 3b) decreases, the restarting pump (1) will continue to operate until the float (4a or 4b) placed therein is raised and the above-mentioned shutdown process is completed.

If stepwise operation of the two pumps (1 and 2) is required and the mains pressure is reduced when the pump (1) is operating, the movable contact (19) and the fixed contact (20) of the pressure switch (16) close and start the pump (2). . Both pumps (1,2) will now operate.

When the pump and pumps are started, a pressure surge or pressure oscillation is created in the pipeline network, which is eliminated by a throttle (22) integrated into the communication tube (14) and an adjustable pressure air cushion (23) enclosed in the shock absorber vessel (15).

This is so that the pressure strikes that occur when the pump (s) (1) are started do not cause an undue switching pulse on the pressure switch (16).

The apparatus according to the invention, as can be seen from the exemplary embodiment, has several advantages. Given that the communication fluid (36) is antifreeze, the electrical elements of the control device can be removed from and located outside the explosive area. The same applies to the reservoirs (3a, 3b), since the apparatus according to the invention has no electrical elements and the degassing apparatus can also be installed in the pool area.

The shut-off fittings (46) lock in a short path for a small change in water level, unlike the floating shut-off valves operated so far. For these, because of the relatively high closing force caused by the pressure, the float had to be placed on a relatively long arm, and as a result, the locking mechanism operated with increasing throttle over a long period. In this way, the reservoir utilization decreased. The specific electricity consumption of the electric motors of the pumps has increased.

The apparatus according to the invention enables the reservoirs in different pressure zones to be filled from a common system, regardless of the level of their overflow.

By simply changing the timer, the water level in the reservoirs can be easily changed without draining.

The apparatus according to the invention is very simple in design, relatively inexpensive and extremely low in maintenance.

Claims (5)

PATENT CLAIMS An apparatus for controlling fluid pumps in a reservoir or reservoirs, for maintaining a suitable fluid level, comprising a pipe connecting the pumps and at least one reservoir and a pressure switch for stopping the pumps, wherein the pressure pipe is connected to the reservoir by means characterized in that the shut-off assembly (46) is a hollow body separated by our valve (6), the lower space of which is connected to the pressure pipe (43) and its upper part is connected to the reservoir and cooperates with our valve (6) a reservoir (5) movable by a float (4a, 4b) located in the reservoir, a diaphragm housing (12) is inserted between the damping vessel (15) and the pressure pipe (43), its lower space (34) connected to the pressure pipe (43); (35) and the shock absorber the container (15) is hydraulically connected via an antifreeze communication fluid (36). Apparatus according to claim 1, characterized in that the damping vessel (15) is closed with an adjustable-pressure air cushion (23) above the communicating fluid (36) and the damping vessel (15) with a submersible tube (42). it is connected to its fluid space and a throttle (22) is provided in the communication tube (14) between the shock absorber vessel (15) and the diaphragm housing (12). Device according to claim 1, characterized in that an adjustable time switch (21) between the contact (17) of the pressure switch (17) and the contactor (45) of the pump (1) resets the pump (1). is filed. Apparatus according to claim 1, characterized in that the closing body (5) of the shut-off assembly (46) is secured by a hinge (31) at the lower end of a rod (26) forced downwardly by a spring (11), while the upper end of the rod (26) with respect to the float (4a, 4b). Apparatus according to claim 1 or 4, characterized in that the closure body (5) has through holes (10).