Pressure control start-stop device of filter press

Abstract

The utility model relates to a pressure control start-stop device of a filter press, which comprises a pressure control circuit, the pressure control circuit comprises an electro connecting pressure gauge, a relay and an intermediate relay, an upper limit output line of the electro connecting pressure gauge is connected with a coil of the relay, and a lower limit output line of the electro connecting pressure gauge is connected with a coil of the intermediate relay. A power line of the electric-contact pressure gauge is connected with a power supply and a ground wire of the electric-contact pressure gauge is grounded; a normally-closed contact of the relay is connected with a coil of the intermediate relay after being connected with a first normally-open contact of the intermediate relay, and a second normally-open contact of the intermediate relay is connected with the start-stop circuit; and the electric contact pressure gauge is provided with a connecting seat and is detachably connected with the outlet pipeline through the connecting seat. The upper pressure limit is set through the electric contact pressure gauge and controls the on-off of the start-stop circuit through the relay and the intermediate relay, so that the on-off of the feed pump is controlled according to the pressure of the filter press.

Description

Technical Field

[0001] The utility model relates to the technical field of filter presses, in particular to a filter press pressure control start-stop device. Background Art

[0002] The filter press needs to control the pressure during operation. When the pressure of the filter press is low, it is difficult to form and clean the filter cake, and it is difficult to handle the filter cake. When the pressure is high, the equipment plate is deformed under pressure, and the high pressure leads to poor sealing and leakage. In severe cases, the equipment plate and frame will be scrapped.

[0003] The existing pressure control method is to use electronic pressure detection equipment combined with PLC controller or single chip microcomputer to control the feed pump of the filter press. This control method has a complex circuit structure and requires an additional power supply. It also requires setting the comparison value through a program, which is costly, inconvenient to adjust, and the hardware circuit is susceptible to external interference. Summary of the invention

[0004] In order to solve the problems of high cost and inconvenient adjustment of the pressure control of the feed pump of the existing filter press, the utility model proposes a filter press pressure control start-stop device comprising an electric contact pressure gauge, a relay and an intermediate relay. The electric contact pressure gauge sets an upper pressure limit and the upper pressure limit controls the on and off of the start-stop circuit through the relay and the intermediate relay to control the start and stop of the feed pump and improve the pressure of the filter press.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a filter press pressure control start-stop device, comprising a feed pump and a start-stop circuit of the filter press, the output port of the feed pump is provided with an outlet pipe, the start-stop circuit is connected in series with a pressure control circuit, the pressure control circuit comprises an electric contact pressure gauge, a relay and an intermediate relay, the upper limit output line of the electric contact pressure gauge is connected to the coil of the relay, the lower limit output line of the electric contact pressure gauge is connected to the coil of the intermediate relay, the power line of the electric contact pressure gauge is connected to the power supply, and the ground line of the electric contact pressure gauge is grounded;

[0006] The normally closed contact of the relay is connected to the first normally open contact of the intermediate relay and then connected to the coil of the intermediate relay, and the second normally open contact of the intermediate relay is connected to the start-stop circuit;

[0007] The electric contact pressure gauge is provided with a connection seat, and the electric contact pressure gauge is detachably connected to the outlet pipe through the connection seat.

[0008] After setting the pressure of the electric contact pressure gauge, set the electric contact pressure gauge at the outlet pipe position through the connection seat to detect the internal pressure of the filter press. When the pressure reaches the upper limit, the electric contact pressure gauge controls the feed pump to stop working through the relay, and the internal pressure of the filter press decreases. When the pressure reaches the lower limit, the electric contact pressure gauge controls the feed pump to start working through the intermediate relay, and the internal pressure of the filter press increases. There is no need to use control elements such as PLC controllers or single-chip microcomputers to realize the start and stop control of the feed pump according to the pressure.

[0009] Further, the start-stop circuit includes a contactor, a start-stop button, a circuit breaker and a fuse, the circuit breaker is connected to a three-phase power supply, and the circuit breaker is connected to the feed pump through a normally open contact of the contactor;

[0010] The fuse is connected to one phase of the circuit breaker, the other side of the fuse is connected to the start / stop button, the other side of the start / stop button is connected to the coil of the contactor via the second normally open contact of the intermediate relay, and the other end of the coil of the contactor is connected to the neutral line of the power supply.

[0011] The main circuit of the start-stop circuit is connected to the three-phase power supply AC380V, and the control circuit of the start-stop circuit adopts AC220V power supply. Compared with the control of PLC controller or single-chip microcomputer, it does not require rectification and voltage conversion, the circuit structure is simple, and the cost is low.

[0012] Furthermore, the power line of the electric contact pressure gauge and the normally closed contact of the relay are electrically connected to the start / stop button;

[0013] The neutral line of the power supply is also connected to the coil of the relay and the coil of the intermediate relay to form a loop.

[0014] Furthermore, the connecting seat is a circular tubular structure, a circular through hole is opened on the circumferential surface of the connecting seat, the detection end of the electric contact pressure gauge is arranged in the circular through hole, and the detection end of the electric contact pressure gauge is sealed and fixed to the connecting seat.

[0015] Furthermore, flanges are fixedly provided at both ends of the connection seat, and the connection seat is detachably connected to the outlet pipe via the flanges.

[0016] The connection base is provided to facilitate the fixing and installation of the electric contact pressure gauge.

[0017] Through the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model realizes the start and stop control of the feed pump according to the internal pressure of the filter press, and the circuit structure is simple and the transformation cost is low. An electric contact pressure gauge, a relay and an intermediate relay are provided, the upper limit output line of the electric contact pressure gauge is connected to the coil of the relay, the lower limit output line of the electric contact pressure gauge is connected to the coil of the intermediate relay, the power line of the electric contact pressure gauge is connected to the power supply, and the ground line of the electric contact pressure gauge is grounded; the normally closed contact of the relay is connected to the first normally open contact of the intermediate relay and then connected to the coil of the intermediate relay, and the second normally open contact of the intermediate relay is connected to the start-stop circuit. The upper and lower pressure limits of the electric contact pressure gauge are set, and the electric contact pressure gauge is connected to the outlet pipe through a connecting seat to detect the pressure at the outlet pipe position. When the internal pressure of the filter press is greater than the upper pressure limit, the coil of the electric contact pressure gauge control relay is energized, so that the coil of the intermediate relay is de-energized, and then the start-stop circuit is de-energized, and at this time the feed pump is de-energized and stopped. After the feed pump stops, the pressure inside the filter press gradually decreases. If the internal pressure of the filter press is lower than the lower pressure limit, the coil of the electric contact pressure gauge control relay is de-energized, while the coil of the intermediate relay is energized, the start-stop circuit is energized, and the feed pump is energized to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an electrical schematic diagram of a filter press pressure control start-stop device of the utility model;

[0020] Figure 2 The utility model is a structural schematic diagram of a filter press pressure control start-stop device.

[0021] Figure numbers: 1 is the feed pump, 2 is the electric contact pressure gauge, 3 is the relay, 4 is the intermediate relay, 5 is the contactor, 6 is the start / stop button, 7 is the circuit breaker, 8 is the fuse, 9 is the connecting seat, and 10 is the flange. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0023] Example 1

[0024] like Figure 1~2 As shown, a filter press pressure control start-stop device comprises a feed pump 1 and a start-stop circuit of the filter press, the output port of the feed pump 1 is provided with an outlet pipe, the start-stop circuit is connected in series with a pressure control circuit, the pressure control circuit comprises an electric contact pressure gauge 2, a relay 3 and an intermediate relay 4, the upper limit output line of the electric contact pressure gauge 2 is connected to the coil of the relay 3, the lower limit output line of the electric contact pressure gauge 2 is connected to the coil of the intermediate relay 4, the power line of the electric contact pressure gauge 2 is connected to the power supply, and the ground line of the electric contact pressure gauge 2 is grounded;

[0025] The normally closed contact of the relay 3 is connected to the first normally open contact of the intermediate relay 4 and then to the coil of the intermediate relay 4, and the second normally open contact of the intermediate relay 4 is connected to the start-stop circuit;

[0026] The electric contact pressure gauge 2 is provided with a connection seat 9, and the electric contact pressure gauge 2 is detachably connected to the outlet pipe via the connection seat 9.

[0027] Preferably, the start-stop circuit comprises a contactor 5, a start-stop button 6, a circuit breaker 7 and a fuse 8, the circuit breaker 7 is connected to a three-phase power supply, and the circuit breaker 7 is connected to the feed pump 1 through a normally open contact of the contactor 5;

[0028] The fuse 8 is connected to one phase of the circuit breaker 7, and the other side of the fuse 8 is connected to the start-stop button 6. The other side of the start-stop button 6 is connected to the coil of the contactor 5 via the second normally open contact of the intermediate relay 4, and the other end of the coil of the contactor 5 is connected to the neutral line of the power supply.

[0029] Preferably, the power line of the electric contact pressure gauge 2 and the normally closed contact of the relay 3 are electrically connected to the start / stop button 6;

[0030] The neutral line of the power supply is also connected to the coil of the relay 3 and the coil of the intermediate relay 4 to form a loop.

[0031] Preferably, the connecting seat 9 is a circular tubular structure, a circular through hole is opened on the circumferential surface of the connecting seat 9, the detection end of the electric contact pressure gauge 2 is arranged in the circular through hole, and the detection end of the electric contact pressure gauge 2 is sealed and fixed to the connecting seat 9.

[0032] Preferably, flanges 10 are fixedly provided at both ends of the connection seat 9 , and the connection seat 9 is detachably connected to the outlet pipe via the flanges 10 .

[0033] Before operation, it is necessary to adjust the upper and lower pressure limits of the electric contact pressure gauge 2. Then, the detection end of the electric contact pressure gauge 2 is set inside the connection seat 9 through the circular through hole, and then the connection seat 9 and the electric contact pressure gauge 2 are sealed and fixed. Then, it is fixed to the outlet pipe through the flange 10.

[0034] During operation, when the detected pressure of the electric contact pressure gauge 2 is greater than the upper limit of pressure, the upper limit output line of the electric contact pressure gauge 2 connects to energize the coil of relay 3, and the normally closed contact of relay 3 is disconnected. The upper limit output line of the electric contact pressure gauge 2 is disconnected. At this time, the coil of the intermediate relay 4 is de-energized, the normally open contact is disconnected, the coil of the contactor 5 is de-energized, the normally open contact of the contactor 5 is disconnected, and the feed pump 1 is de-energized and stops working.

[0035] Feed pump 1 is powered off, and the detection pressure of electric contact pressure gauge 2 gradually decreases until the detection pressure of electric contact pressure gauge 2 is less than the lower pressure limit. The lower limit output line of electric contact pressure gauge 2 is closed, the upper limit output line of electric contact pressure gauge 2 is disconnected, the coil of intermediate relay 4 is energized, the normally open contact is closed, and at the same time, the coil of relay 3 is powered off, the normally closed contact is reset, the coil of contactor 5 is energized, the normally open contact of contactor 5 is closed, and then feed pump 1 is powered on to work.

[0036] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A filter press pressure control start-stop device, comprising a feed pump (1) of the filter press and a start-stop circuit, wherein the output port of the feed pump (1) is provided with an outlet pipe, characterized in that: The start-stop circuit is connected in series with a pressure control circuit, the pressure control circuit comprising an electric contact pressure gauge (2), a relay (3) and an intermediate relay (4), the upper limit output line of the electric contact pressure gauge (2) being connected to the coil of the relay (3), the lower limit output line of the electric contact pressure gauge (2) being connected to the coil of the intermediate relay (4), the power line of the electric contact pressure gauge (2) being connected to a power source, and the ground line of the electric contact pressure gauge (2) being grounded; The normally closed contact of the relay (3) is connected to the first normally open contact of the intermediate relay (4) and then connected to the coil of the intermediate relay (4); the second normally open contact of the intermediate relay (4) is connected to the start-stop circuit; The electric contact pressure gauge (2) is provided with a connection seat (9), and the electric contact pressure gauge (2) is detachably connected to the outlet pipe via the connection seat (9).

2. A filter press pressure control start-stop device according to claim 1, characterized in that: The start-stop circuit comprises a contactor (5), a start-stop button (6), a circuit breaker (7) and a fuse (8); the circuit breaker (7) is connected to a three-phase power supply, and the circuit breaker (7) is connected to the feed pump (1) via a normally open contact of the contactor (5); The fuse (8) is connected to one phase of the circuit breaker (7), the other side of the fuse (8) is connected to the start / stop button (6), the other side of the start / stop button (6) is connected to the coil of the contactor (5) via the second normally open contact of the intermediate relay (4), and the other end of the coil of the contactor (5) is connected to the neutral line of the power supply.

3. A filter press pressure control start-stop device according to claim 2, characterized in that: The power line of the electric contact pressure gauge (2) and the normally closed contact of the relay (3) are both electrically connected to the start / stop button (6); The neutral line of the power supply is also connected to the coil of the relay (3) and the coil of the intermediate relay (4) to form a loop.

4. A filter press pressure control start-stop device according to claim 1, characterized in that: The connecting seat (9) is a circular tubular structure, a circular through hole is provided on the circumferential surface of the connecting seat (9), the detection end of the electric contact pressure gauge (2) is arranged in the circular through hole, and the detection end of the electric contact pressure gauge (2) is sealed and fixed to the connecting seat (9).

5. A filter press pressure control start-stop device according to claim 1, characterized in that: Flange plates (10) are fixedly provided at both ends of the connection seat (9), and the connection seat (9) is detachably connected to the outlet pipe via the flange plates (10).

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