Automatic reversing butterfly valve

Abstract

The utility model relates to the technical field of butterfly valve control, and discloses an automatic reversing butterfly valve, one end of a line L1 is connected in series with a fuse FU, and the other end of the fuse FU is respectively connected in parallel with contacts 1, 3 and 5 of a positive sequence alternating current contactor KMz and a negative sequence alternating current contactor KMf through a phase sequence relay; contacts 2, 4 and 6 of the positive sequence alternating current contactor KMz and contacts 6, 4 and 2 of the negative sequence alternating current contactor KMf are connected in parallel and then are connected to a positive rotation contactor KM1, a negative rotation contactor KM2, a positive rotation contactor KM3 and a negative rotation contactor KM4; when incoming lines A, B and C are electrified, the incoming lines A, B and C are firstly judged by the phase sequence relay, if the phase sequence is correct, the positive sequence alternating current contactor KMz is switched on, and the phase sequence does not change; if the phase sequences are opposite, a reverse-sequence alternating current contactor KMf is switched on, and the phase sequence of the AC phase is adjusted after passing through the reverse-sequence alternating current contactor KMf, so that the phase sequence is changed into a forward phase sequence; therefore, the safety of the butterfly valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valve control, in particular to an automatic reversing butterfly valve. Background Art

[0002] When mining coal, it is necessary to ensure ventilation in the mine. Generally, two fans are installed in the mine to facilitate switching between the two fans. The damper is for convenient and closed switching of the fans. A butterfly valve is installed in the damper for use as a switch.

[0003] The existing fan damper is generally equipped with only one butterfly valve. Therefore, when the damper fails during operation, the main fan must be shut down before the butterfly valve can be repaired and the fault can be eliminated. Once the fan stops, the gas content in the mine will increase, threatening the life safety of the workers in the mine. Therefore, further improvements can be made. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides an automatic reversing butterfly valve, which has the advantage of automatic reversing and solves the above-mentioned problems.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of automatic reversing, the utility model provides the following technical solutions: an automatic reversing butterfly valve, comprising a circuit L1, one end of the circuit L1 is connected in series with a fuse FU, the other end of the fuse FU is connected in parallel with the 1, 3, and 5 contacts of the positive sequence AC contactor KMz and the reverse sequence AC contactor KMf through a phase sequence relay, and the 2, 4, and 6 contacts of the positive sequence AC contactor KMz are connected in parallel with the 6, 4, and 2 contacts of the reverse sequence AC contactor KMf, and then connected to the forward contactor KM1 and the reverse contactor KM2. On the forward contactor KM2, the forward contactor KM3 and the reverse contactor KM4, the 2, 4, 6 contacts of the forward contactor KM1 are connected in parallel with the 6, 4, 2 contacts of the reverse contactor KM2 and then connected to the thermal relay KH1, the 2, 4, 6 contacts of the forward contactor KM3 are connected in parallel with the 6, 4, 2 contacts of the reverse contactor KM4 and then connected to the thermal relay KH2, the 2, 4, 6 contacts of the thermal relay KH1 are connected to the 1# butterfly valve, and the 2, 4, 6 contacts of the thermal relay KH2 are connected to the 2# butterfly valve.

[0008] Preferably, the other ends of the positive sequence AC contactor KMz and the reverse sequence AC contactor KMf are connected in parallel to PN, and the other end of PN is also connected to the forward contactor KM1, the reverse contactor KM2, the forward contactor KM3 and the reverse contactor KM4.

[0009] Preferably, the line L1 is connected in parallel to the power supply, closed position and open position three indicator lights of the 1# butterfly valve through the power knob SS1, and is connected in parallel to PN; the other end of the power knob SS1 is connected in series with the thermal relay KH1, and the thermal relay KH1 and the forward contactor KM1 are connected in parallel with one end of the forward start button SB2, and the thermal relay KH1 and the forward contactor KM2 are connected in parallel with one end of the reverse start button SB3.

[0010] Preferably, the line L1 is connected in parallel to the power supply, the three indicator lights of the closed position and the open position of the 2# butterfly valve through the power knob SS2, and is connected in parallel to PN; the other end of the power knob SS2 is connected in series with one end of the thermal relay KH2, the thermal relay KH2 and the forward contactor KM3 are connected in parallel with one end of the forward start button SB2, and the thermal relay KH2 and the forward contactor KM4 are connected in parallel with one end of the reverse start button SB3.

[0011] Preferably, the forward start button SB2 and the reverse start button SB3 are connected in parallel to PN.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides an automatic reversing butterfly valve, which has the following beneficial effects:

[0014] 1. For this automatic reversing butterfly valve, when the incoming lines A, B, and C are energized, they will first be judged by the phase sequence relay. If the phase sequence is correct, the positive sequence AC contactor KMz will be connected, and the phase sequence will not change; if the phase sequence is opposite, the reverse sequence AC contactor KMf will be connected, and the phase sequence will be adjusted to the positive phase sequence after passing through the reverse sequence AC contactor KMf; it is connected to the forward and reverse contactors to ensure that the phase sequence of the butterfly valve will not be affected regardless of whether the external phase sequence changes, thereby ensuring the safety of the butterfly valve.

[0015] 2. For the automatic reversing butterfly valve, by turning on the power knob SS1, the power indicator light comes on. When the forward button is pressed, the forward contactor is energized, and the auxiliary contact of the forward contactor KM1 is energized, forming a self-locking and interlocking with the reverse contactor, so that the reverse contactor will not be energized even if the reverse button is pressed; when the butterfly valve rotates forward to the limit, the limit switch operates, cutting off the forward contactor, and the in-position indicator light comes on; the reversing principle is the same as the forward principle, but the phase sequence is opposite; when the equipment is overloaded, the thermal relay will operate to cut off the forward and reverse circuits to protect the butterfly valve motor from being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle of the utility model;

[0017] Figure 2 It is a schematic diagram of the principle of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-2 An automatic reversing butterfly valve includes a circuit L1, one end of which is connected in series with a fuse FU, the other end of which is connected in parallel with contacts 1, 3, and 5 of a positive sequence AC contactor KMz and a reverse sequence AC contactor KMf through a phase sequence relay, contacts 2, 4, and 6 of the positive sequence AC contactor KMz are connected in parallel with contacts 6, 4, and 2 of the reverse sequence AC contactor KMf, and then connected to forward contactors KM1, KM2, and KM3. 3 and reversing contactor KM4, the 2, 4, 6 contacts of the forward contactor KM1 and the 6, 4, 2 contacts of the reversing contactor KM2 are connected in parallel and then connected to the thermal relay KH1, the 2, 4, 6 contacts of the forward contactor KM3 and the 6, 4, 2 contacts of the reversing contactor KM4 are connected in parallel and then connected to the thermal relay KH2, the 2, 4, 6 contacts of the thermal relay KH1 are connected to the 1# butterfly valve, and the 2, 4, 6 contacts of the thermal relay KH2 are connected to the 2# butterfly valve.

[0020] See also Figure 1-2 The other ends of the positive sequence AC contactor KMz and the reverse sequence AC contactor KMf are connected in parallel to PN, and the other end of PN is also connected to the forward contactor KM1, the reverse contactor KM2, the forward contactor KM3 and the reverse contactor KM4.

[0021] See also Figure 1-2 , line L1 is connected in parallel to the power supply, closed position and open position indicator lights of 1# butterfly valve through the power knob SS1, and is connected in parallel to PN; the other end of the power knob SS1 is connected in series with the thermal relay KH1, the thermal relay KH1 and the forward contactor KM1 are connected in parallel with one end of the forward start button SB2, and the thermal relay KH1 and the forward contactor KM2 are connected in parallel with one end of the reverse start button SB3.

[0022] See also Figure 1-2, line L1 is connected in parallel to the power supply, the three indicators of the closed position and the open position of the 2# butterfly valve through the power knob SS2, and is connected in parallel to PN; the other end of the power knob SS2 is connected in series with one end of the thermal relay KH2, the thermal relay KH2 and the forward contactor KM3 are connected in parallel with one end of the forward start button SB2, the thermal relay KH2 and the forward contactor KM4 are connected in parallel with one end of the reverse start button SB3,

[0023] See also Figure 1-2 The forward start button SB2 and the reverse start button SB3 are connected in parallel to PN.

[0024] Form a primary circuit: circuit incoming lines A, B, C are connected to contacts 1, 3, 5 of positive sequence AC contactor KMz and reverse sequence AC contactor KMf respectively, contacts 2, 4, 6 of KMz and contacts 6, 4, 2 of KMf are connected in parallel and then connected to 1# butterfly valve forward contactor KM1, 1# reverse contactor KM2, 2# forward contactor KM3, 2# reverse contactor KM4;

[0025] Contacts 2, 4, and 6 of KM1 and contacts 6, 4, and 2 of KM2 are connected in parallel and then connected to contacts 1, 3, and 5 of thermal relay FR. Contacts 2, 4, and 6 of the thermal relay and the outgoing line are connected to the butterfly valve (the connection method of 2# butterfly valve is the same as that of 1# butterfly valve).

[0026] The secondary circuit is formed: A, B, C of the circuit are connected to 1, 2, 3 of the phase sequence relay through the corresponding fuse FU respectively. The A phase incoming line forms line 101 after passing through fuse FU0, and 101 is connected to A1 of the positive sequence AC contactor after passing through auxiliary contacts 5 and 6 of the phase sequence relay. At the same time, 101 is connected to A1 of the reverse sequence AC contactor through points 7 and 8 of the phase sequence relay; A2 of the positive and reverse sequence AC contactors are connected in parallel and then connected to PN.

[0027] Taking 1# butterfly valve as an example, after 101 passes through No. 1 power knob SS1, it is connected to the three indicator lights of power, closed position and open position respectively. At the same time, after passing through the normally closed auxiliary contact of the thermal relay, it is connected to the stop knob SB1. After passing through SB1, it is connected to the forward start button SB2 and the reverse start button SB3 respectively. At the same time, SB2 is connected in parallel with the normally open auxiliary contact of KM1, and SB3 is connected in parallel with the normally open auxiliary contact of KM2. After parallel connection, SB2 is connected to the normally closed contact of KM2 and connected to PN through the butterfly valve limit switch, and SB3 is connected to the normally closed contact of KM1 and connected to PN through the external butterfly valve limit switch.

[0028] Working principle: When in use, when the incoming lines A, B, and C are energized, they will first be judged by the phase sequence relay. If the phase sequence is correct, the positive-sequence AC contactor KMz will be connected, and the phase sequence will not change; if the phase sequence is opposite, the reverse-sequence AC contactor KMf will be connected, and the phase sequence will be adjusted to the forward phase sequence after passing through the reverse-sequence AC contactor KMf; connected to the forward and reverse contactors, it ensures that the phase sequence of the butterfly valve will not be affected regardless of whether the external phase sequence changes, thereby ensuring the safety of the butterfly valve.

[0029] By turning on the power knob SS1, the power indicator light comes on. When the forward button is pressed, the forward contactor is energized, and the auxiliary contact of the forward contactor KM1 is energized to form a self-locking and interlocking with the reverse contactor, so that the reverse contactor will not be energized even if the reverse button is pressed; when the butterfly valve rotates forward to the limit, the limit switch runs, cutting off the forward contactor, and the in-position indicator light comes on; the reverse principle is the same as the forward principle, but the phase sequence is opposite; when the equipment is overloaded, the thermal relay will operate to cut off the forward and reverse circuits to protect the butterfly valve motor from being affected.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic reversing butterfly valve, comprising a circuit L1, characterized in that: One end of the line L1 is connected in series with a fuse FU, and the other end of the fuse FU is connected in parallel with the 1, 3, and 5 contacts of the positive sequence AC contactor KMz and the reverse sequence AC contactor KMf through a phase sequence relay. The 2, 4, and 6 contacts of the positive sequence AC contactor KMz and the 6, 4, and 2 contacts of the reverse sequence AC contactor KMf are connected in parallel and then connected to the forward contactor KM1, the reverse contactor KM2, the forward contactor KM3, and the reverse contactor KM4. The 2, 4, 6 contacts of the forward contactor KM1 and the 6, 4, 2 contacts of the reverse contactor KM2 are connected in parallel and then connected to the thermal relay KH1. The 2, 4, 6 contacts of the forward contactor KM3 and the 6, 4, 2 contacts of the reverse contactor KM4 are connected in parallel and then connected to the thermal relay KH2. The 2, 4, 6 contacts of the thermal relay KH1 are connected to the 1# butterfly valve, and the 2, 4, 6 contacts of the thermal relay KH2 are connected to the 2# butterfly valve.

2. The automatic reversing butterfly valve according to claim 1, characterized in that: The other ends of the positive sequence AC contactor KMz and the reverse sequence AC contactor KMf are connected in parallel to PN, and the other end of PN is also connected to the forward contactor KM1, the reverse contactor KM2, the forward contactor KM3 and the reverse contactor KM4.

3. The automatic reversing butterfly valve according to claim 2, characterized in that: The line L1 is connected in parallel to the power supply, the three indicator lights of the closed position and the open position of the 1# butterfly valve through the power knob SS1, and is connected in parallel to PN; the other end of the power knob SS1 is connected in series with the thermal relay KH1, and the thermal relay KH1 and the forward contactor KM1 are connected in parallel with one end of the forward start button SB2, and the thermal relay KH1 and the forward contactor KM2 are connected in parallel with one end of the reverse start button SB3.

4. The automatic reversing butterfly valve according to claim 3, characterized in that: The line L1 is connected in parallel to the power supply, closed position and open position indicator lights of the 2# butterfly valve through the power knob SS2, and is connected in parallel to PN; the other end of the power knob SS2 is connected in series with one end of the thermal relay KH2, the thermal relay KH2 and the forward contactor KM3 are connected in parallel with one end of the forward start button SB2, and the thermal relay KH2 and the forward contactor KM4 are connected in parallel with one end of the reverse start button SB3.

5. The automatic reversing butterfly valve according to claim 4, characterized in that: The forward start button SB2 and the reverse start button SB3 are connected in parallel to PN.

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