CN216741949U - Stable water supply device for recycling machine seal cooling water - Google Patents
Stable water supply device for recycling machine seal cooling water Download PDFInfo
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- CN216741949U CN216741949U CN202122664617.1U CN202122664617U CN216741949U CN 216741949 U CN216741949 U CN 216741949U CN 202122664617 U CN202122664617 U CN 202122664617U CN 216741949 U CN216741949 U CN 216741949U
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Abstract
The utility model provides a machine seals cooling water cyclic utilization and stabilizes water supply installation, includes: the device comprises a circulating water tank, a first circulating pump, a second circulating pump, a pressure difference control module, a conveying pipeline and a return pipeline; the input end of the first circulating pump and the input end of the second circulating pump are both connected with the output end of the circulating water tank, the output end of the first circulating pump and the output end of the second circulating pump are both connected with the first end of the conveying pipeline, and the second end of the return pipeline is connected with the input end of the circulating water tank; the second end of the conveying pipeline and the first end of the return pipeline are used for connecting a field device; the control end of the first circulating pump and the control end of the second circulating pump are both connected with a pressure difference control module, and the pressure difference control module carries out interlocking control on the first circulating pump and the second circulating pump according to the pressure intensity in the conveying pipeline. The utility model realizes the bidirectional switching of the first circulating pump and the second circulating pump, has flexible and controllable working mode and low operation difficulty, and ensures the reliability of the cyclic utilization of the machine seal cooling water.
Description
Technical Field
The utility model relates to the field of circuit control, in particular to a stable water supply device for recycling machine seal cooling water.
Background
At present, in the production process, machine seal cooling water directly enters a system, so that the production water exceeds the standard, the natural gas amount is increased, and the production cost is obviously increased. Based on this, the machine seal cooling water recycling scheme appears in the prior art. However, due to complex working conditions, once the circulating pump fails, the whole machine seal cooling water circulating system is broken down, so that the risk of high-temperature work of production equipment is caused, even the production is stopped for maintenance, and the loss is serious.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that the circulation process of the machine seal cooling water in the prior art is too dependent on a circulating pump, the utility model provides the stable water supply device for recycling the machine seal cooling water, which realizes the bidirectional switching of a first circulating pump and a second circulating pump, has flexible and controllable working mode and low operation difficulty and ensures the reliability of recycling the machine seal cooling water.
The utility model adopts the following technical scheme:
the utility model provides a machine seals cooling water cyclic utilization and stabilizes water supply installation, includes: the device comprises a circulating water tank, a first circulating pump, a second circulating pump, a pressure difference control module, a conveying pipeline and a return pipeline; the input end of the first circulating pump and the input end of the second circulating pump are both connected with the output end of the circulating water tank, the output end of the first circulating pump and the output end of the second circulating pump are both connected with the first end of the conveying pipeline, and the second end of the return pipeline is connected with the input end of the circulating water tank; the second end of the conveying pipeline and the first end of the return pipeline are used for connecting a field device;
the control end of the first circulating pump and the control end of the second circulating pump are both connected with a pressure difference control module, and the pressure difference control module carries out interlocking control on the first circulating pump and the second circulating pump according to the pressure intensity in the conveying pipeline.
Preferably, the differential pressure control module includes: the relay comprises a first relay, a second relay, a time delay relay, an intermediate relay, a pressure difference control switch and a first control switch; the main contact of the first relay is connected with the control end of the first circulating pump in series, and the main contact of the second relay is connected with the control end of the second circulating pump in series;
a coil of the first relay is connected in series with the first control switch and is marked as a first branch circuit, and the first branch circuit is connected between the live wire and the zero line; the first auxiliary contact of the first relay is connected with the first control switch in parallel;
a coil of the second relay is connected in series with a first auxiliary contact of the second relay and is marked as a second branch circuit, and the second branch circuit is connected between the live wire and the zero wire; a coil of the time delay relay and a second auxiliary contact of the first relay are connected in series between the live wire and the zero wire, and a second auxiliary contact of the second relay is connected in parallel with a second auxiliary contact of the first relay;
a first contact of the intermediate relay is connected in series with a coil of the second relay and is marked as a third branch, and the third branch is connected in parallel with the first branch; a second contact of the intermediate relay is connected with a coil of the first relay in series to form a fourth branch circuit, and the fourth branch circuit is connected with the second branch circuit in parallel;
the coil of the intermediate relay, the contact of the delay relay and the differential pressure control switch are connected in series between the live wire and the zero line; the pressure difference control switch is a normally open switch, the detection end of the pressure difference control switch is used for detecting the pressure intensity in the output pipeline, and the pressure difference control switch is closed when the pressure intensity detected by the detection end of the pressure difference control switch is smaller than a set threshold value;
the main contact, the first auxiliary contact and the second auxiliary contact of the first relay are all normally open contacts, the main contact, the first auxiliary contact and the second auxiliary contact of the second relay are all normally open contacts, the first contact and the second contact of the intermediate relay are normally open contacts, and the contact of the time delay relay is a normally open contact; a coil of the first relay is attracted to a main contact, a first auxiliary contact and a second auxiliary contact of the first relay in a power-on state; a coil of the second relay is attracted to the main contact, the first auxiliary contact and the second auxiliary contact under the power-on state; a coil of the intermediate relay is attracted with a first contact and a second contact of the intermediate relay in a power-on state; the coil of the delay relay is electrified and then the contact of the delay relay is attracted in a delayed way.
Preferably, the system further comprises a second control switch and a fourth control switch, the first branch is connected with the live wire or the zero wire through the second control switch, and the second branch is connected with the live wire or the zero wire through the fourth control switch.
Preferably, the second control switch and the fourth control switch are both normally closed switches.
Preferably, the relay further comprises a third control switch connected in parallel with the first auxiliary contact of the second relay.
Preferably, the branch where the control end of the first circulating pump is located is also connected in series with a first motor protector, and a contact of the first motor protector is connected in series on the first branch; a branch where the control end of the second circulating pump is located is also connected with a second motor protector in series, and a contact of the second motor protector is connected on the second branch in series; and the contact of the first motor protector and the contact of the second motor protector are both normally closed contacts.
Preferably, the branch where the control end of the first circulating pump is located is also connected in series with a first circuit breaker, and the branch where the control end of the second circulating pump is located is also connected in series with a second circuit breaker.
Preferably, the coil of the first relay is connected with a first indicator lamp in parallel, and the coil of the second relay is connected with a second indicator lamp in parallel.
Preferably, the output of first circulating pump is equipped with first check valve, the output of second circulating pump is equipped with the second check valve.
Preferably, the circulating water tank is further connected with a supplementing pipeline, the supplementing pipeline is used for supplementing process water to the circulating water tank, and the supplementing pipeline is provided with an adjusting valve.
After a first control switch is pressed down, a first branch circuit is electrified, a coil of a first relay is electrified to attract a main contact, a first auxiliary contact and a second auxiliary contact of the first relay, so that a coil of a first circulating pump and a coil of a time delay relay are electrified, the coil of the time delay relay attracts the contacts of the time delay relay in a time delay manner, when the working condition environment of the first circulating pump is abnormal, a pressure difference control switch senses that the pressure on a water path is abnormal and is closed, a fourth branch circuit is conducted, a coil of an intermediate relay is electrified and attracts the first contact and the second contact of the intermediate relay, so that the coil of a second relay is electrified, the main contact, the first auxiliary contact and the second auxiliary contact of the second circulating pump are attracted, the coil of the second circulating pump and the time delay relay are electrified, the second circulating pump is put into operation, and the first circulating pump is replaced by the second circulating pump.
The principle is the same as the main-standby switching principle when the first circulating pump fails. And when the working condition of the second circulating pump is abnormal, the second circulating pump can be automatically switched to the first circulating pump to operate.
The utility model has the advantages that:
(1) according to the utility model, the first circulating pump or the second circulating pump in the running state is used as the main pump, and the first circulating pump or the second circulating pump in the idle state is used as the standby pump.
(2) According to the utility model, through the arrangement of the second control switch and the fourth control switch, the standby pump can be conveniently and completely withdrawn, and the safe maintenance of the standby pump is realized.
(3) In the utility model, the second control switch and the fourth control switch are both normally closed switches. So, when the circuit starts, need not operate second control switch and fourth control switch, simplified this machine and sealed cooling water cyclic utilization and stabilized water supply installation's the operation degree of difficulty.
(4) According to the utility model, through the arrangement of the third control switch, a symmetrical circuit control structure is realized, so that the control of the first circulating pump and the second circulating pump is more flexible and reliable.
(5) According to the utility model, the first motor protector automatically trips to disconnect the first branch when the current or voltage is abnormal, so that the first circulating pump is withdrawn from operation; the second motor protector automatically trips to disconnect the second branch when the current or voltage is abnormal, so that the second circulating pump is quitted from running. The setting of first motor protector and second motor protector further provides the guarantee for the operating mode safety of first circulating pump and second circulating pump.
Drawings
Fig. 1 is a schematic water path diagram of a stable water supply device for recycling machine seal cooling water provided by embodiment 1;
FIG. 2 is a schematic circuit diagram of a differential pressure control module according to embodiment 2;
fig. 3 is a schematic circuit diagram of a differential pressure control module according to embodiment 3.
The figure is as follows: 1. a circulating water tank; 2. a delivery conduit; 3. a return line; 4. a supplementary pipeline; 5. a first check valve; 6. a second check valve; 7. adjusting a valve; 8. a first valve; 9. a second valve; 100. a field device;
m1, first circulation pump; m2, second circulation pump; SB1, first control switch; SB2, second control switch; SB3, third control switch; SB4, fourth control switch; QF1, first circuit breaker; QF2, second circuit breaker; f1, a first motor protector; f1-1, a contact of a first motor protector; f2, a second motor protector; f2-2, a contact of a second motor protector; SP1, differential pressure control switch; p1, control end of pressure difference control switch; l, any phase live wire; L1/L2/L3, three-phase live wire; n, a zero line; HL1, first indicator light; HL2, second indicator light; FU and fuse;
KM1, main contact of the first relay; KM1-A, coil of the first relay; KM1-13, a first auxiliary contact of a first relay; KM1-23, a second auxiliary contact of the first relay; KM2, main contact of a second relay; KM2-A, coil of the second relay; KM2-13, a first auxiliary contact of a second relay; KM2-23, a second auxiliary contact of a second relay; KT1, coil of time delay relay; KT1-13, contact of the time delay relay; k1, coil of intermediate relay; k1-13, a first contact of the intermediate relay; k1-23, the second contact of the intermediate relay.
Detailed Description
Example 1
Referring to fig. 1, the stable water supply device for recycling machine seal cooling water provided by the embodiment includes: the device comprises a circulating water tank 1, a first circulating pump M1, a second circulating pump M2, a pressure difference control module, a conveying pipeline 2 and a return pipeline 3; the input end of the first circulating pump M1 and the input end of the second circulating pump M2 are both connected with the output end of the circulating water tank 1, the output end of the first circulating pump M1 and the output end of the second circulating pump M2 are both connected with the first end of the conveying pipeline 2, and the second end of the return pipeline 3 is connected with the input end of the circulating water tank 1; the second end of the delivery conduit 2 is configured to be coupled to a field device, and specifically, the second end of the delivery conduit 2 is configured to be coupled to a water seal input of the field device 100, and the first end of the return conduit 3 is configured to be coupled to a water seal output of the field device 100.
In this way, when any one of the first circulating pump M1 and the second circulating pump M2 is turned on, water circulation in a water path formed by the circulating water tank 1, the delivery pipe 2, the field device and the return pipe 3 can be realized, so that water in the circulating water tank 1 is delivered to the field device through the delivery pipe 2 for machine-sealing cooling, and machine-sealing water after cold is absorbed by the field device is returned to the circulating water tank 1 through the return pipe 3 for cold supplementation and recycling.
The control end of first circulating pump M1 and the control end of second circulating pump M2 are both connected with a pressure difference control module, and the pressure difference control module carries out interlocking control on first circulating pump M1 and second circulating pump M2 according to the pressure in conveying pipeline 2.
That is, when the first circulation pump M1 is in an operating state, if the pressure inside the delivery pipe 2 is abnormal, the differential pressure control module controls the first circulation pump M1 to stop operating, and the second circulation pump M2 is put into operation; when the second circulation pump M2 is in operation, if the pressure in the delivery pipe 2 is abnormal, the pressure difference control module controls the second circulation pump M2 to stop operating, and the first circulation pump M1 is put into operation
Therefore, in this embodiment, the first circulation pump M1 or the second circulation pump M2 is used as the main pump in the operating state, the first circulation pump M1 or the second circulation pump M2 is used as the standby pump in the idle state, and the pressure difference control module is arranged to realize the automatic switching between the main circulation pump and the standby circulation pump in the pressure difference interlocking and abnormal states for the first circulation pump M1 and the second circulation pump M2, so that the self-elimination of the fault of the whole circulation water path is ensured.
In this embodiment, the differential pressure control module identifies whether the main pump is malfunctioning or not according to the pressure inside the delivery pipe 2. Specifically, in this embodiment, when the pressure difference control module detects that the pressure inside the delivery pipe 2 is smaller than the set threshold, it is determined that the main pump fails, so that the operation of the backup pump is switched.
The differential pressure control module of the present embodiment is further described below with reference to two specific embodiments.
Example 2
Referring to fig. 2, the present embodiment provides a differential pressure control module, including: the relay comprises a first relay, a second relay, a time delay relay, an intermediate relay, a pressure difference control switch SP1 and a first control switch SB 1. The main contact KM1 of the first relay is connected in series with the control end of the first circulating pump M1, and the main contact KM2 of the second relay is connected in series with the control end of the second circulating pump M2. That is, when the main contact KM1 of the first relay is opened, the first circulation pump M1 is de-energized; when the main contact KM2 of the second relay is disconnected, the second circulating pump M2 is de-energized. Similarly, after the other disconnection points of the branch where the first circulating pump M1 is located are all turned on, the first circulating pump M1 can be put into operation only by closing the main contact KM1 of the first relay; after other disconnection points of the branch where the second circulating pump M2 is located are all turned on, the second circulating pump M2 can be put into operation only by closing the main contact KM2 of the second relay. Therefore, after the other disconnection points of the branch where the first circulation pump M1 is located and the other disconnection points of the branch where the second circulation pump M2 is located are both turned on, the operation control of the first circulation pump M1 and the second circulation pump M2 can be realized by controlling the on-off of the main contact KM1 of the first relay and the main contact KM2 of the second relay.
In this embodiment, the first end of the first control switch SB1 is used for connecting the live wire L, the second end of the first control switch SB1 is used for connecting the first end of the coil KM1-a of the first relay, and the second end of the coil KM1-a of the first relay is used for connecting the neutral wire N. Namely, a coil KM1-a of the first relay is connected in series with the first control switch SB1 and is referred to as a first branch, a first end of the first branch is used for connecting the live wire L, and a second end of the first branch is connected with the neutral wire N. The first auxiliary contact KM1-13 of the first relay is connected in parallel with the first control switch SB1, i.e. the first end of the first auxiliary contact KM1-13 of the first relay is connected with the first end of the first control switch SB1, and the second end of the first auxiliary contact KM1-13 of the first relay is connected with the second end of the first control switch SB 1.
The first end of the first auxiliary contact KM2-13 of the second relay is used for connecting a live wire L, the second end of the first auxiliary contact KM2-13 of the second relay is used for connecting the first end of a coil KM2-A of the second relay, and the second end of the coil KM2-A of the second relay is connected with a neutral wire N. Namely, a coil KM2-A of the second relay is connected with a first auxiliary contact KM2-13 of the second relay in series and is marked as a second branch, a first end of the second branch is used for connecting a live wire L, and a second end of the second branch is connected with a zero wire N.
The first end of the second auxiliary contact KM1-23 of the first relay is connected with a live wire L, the second end of the second auxiliary contact KM1-23 of the first relay is connected with the first end of a coil KT1 of the time delay relay, and the second end of a coil KT1 of the time delay relay is connected with a neutral wire N. The second auxiliary contact KM2-23 of the second relay is connected in parallel with the second auxiliary contact KM1-23 of the first relay, namely, the first end of the second auxiliary contact KM2-23 of the second relay is connected with a live wire, and the second end of the second auxiliary contact KM2-23 of the second relay is connected with the first end of the coil KT1 of the time delay relay.
A coil K1 of the intermediate relay, a contact KT1-13 of the delay relay and a differential pressure control switch SP1 are connected in series and are recorded as an induction control branch, the first end of the induction control branch is connected with a live wire L, and the second end of the induction control branch is connected with a zero wire N. The pressure difference control switch SP1 is a normally open switch, a detection end P1 of the pressure difference control switch SP1 is used for detecting the pressure in the conveying pipeline 2, and the pressure difference control switch SP1 is used for closing when the pressure detected by the detection end P1 of the pressure difference control switch is smaller than a set threshold value.
The first end of the first contact K1-13 of the intermediate relay is connected with the first end of the first control switch SB1, and the second end of the first contact K1-13 of the intermediate relay is connected with the second end of the first contact KM2-13 of the second relay; that is, the first contact K1-13 of the intermediate relay is connected in series with the coil KM2-A of the second relay to form a third branch in parallel with the first branch.
The first ends of the second contacts K1-23 of the intermediate relay are connected to the first ends of the first contacts KM2-13 of the second relay, and the second ends of the second contacts K1-23 of the intermediate relay are connected to the second end of the first control switch SB 1. The second contact K1-23 of the intermediate relay is connected in series with the coil KM1-A of the first relay to form a fourth branch which is connected in parallel with the second branch.
The main contact KM1, the first auxiliary contact KM1-13 and the second auxiliary contact KM1-23 of the first relay are all normally open contacts, the main contact KM2, the first auxiliary contact KM2-13 and the second auxiliary contact KM2-23 of the second relay are all normally open contacts, the first contact K1-13 and the second contact K1-23 of the intermediate relay are normally open contacts, and the contact KT1-13 of the time delay relay is a normally open contact; a coil KM1-A of the first relay is attracted to a main contact KM1, a first auxiliary contact KM1-13 and a second auxiliary contact KM1-23 under the power-on state; a coil KM2-A of the second relay is attracted to a main contact KM2, a first auxiliary contact KM2-13 and a second auxiliary contact KM2-23 under the power-on state; a coil K1 of the intermediate relay attracts a first contact K1-13 and a second contact K1-23 of the intermediate relay in an electrified state; after the coil KT1 of the time delay relay is electrified, the contact KT1-13 is attracted in a time delay way.
In this embodiment, the branch where the first circulation pump M1 and the main contact KM1 of the first relay are located is further connected in series with a first breaker QF1 and a first motor protector F1, and a contact F1-1 of the first motor protector is connected in series on the first branch, so that the first branch is automatically disconnected through the contact F1-1 when the first motor protector F1 trips, and thus the coil KM1-a of the first relay loses power, the main contact KM1 of the first relay is disconnected, and the first circulation pump M1 is withdrawn.
The branch where the second circulating pump M2 and the main contact KM2 of the second relay are located is also connected with a second breaker QF2 and a second motor protector F2 in series, and a contact F2-1 of the second motor protector is connected on the second branch in series, so that the second branch is automatically disconnected through the contact F2-1 when the second motor protector F2 trips, and therefore the coil KM2-A of the second relay loses power, the main contact KM2 of the second relay is disconnected, and the second circulating pump M2 is withdrawn.
In this embodiment, first circulating pump M1 and second circulating pump M2 are connected the three-phase electricity and are supplied power, and first circuit breaker QF1, second circuit breaker QF2, the main contact KM1 of first relay and the main contact KM2 of second relay all adopt three-phase switch to make things convenient for the wiring.
In this embodiment, the operation principle of the stable water supply device for recycling the machine seal cooling water using the first circulation pump M1 as the main pump is as follows.
When the breaker is started, the first breaker QF1 and the first breaker QF2 are closed firstly during operation; after the first control switch SB1 is closed, a coil KM1-A of the first relay is electrified and attracts a main contact KM1, a first auxiliary contact KM1-13 and a second auxiliary contact KM 1-23; the main contact KM1 of the first relay is closed, so that the first circulating pump M1 is put into operation; the first auxiliary contact KM1-13 of the first relay is closed, so that the coil KM1-A can work normally when the first control switch SB1 fails or is accidentally bounced open; the second auxiliary contact KM1-23 of the first relay is closed, so that the contact KT1-13 of the time delay relay KT1 is electrified and is attracted in a time delay manner, namely the contact KT1-13 of the time delay relay is attracted after the first circulating pump M1 runs to a set first time value;
when the first circulating pump M1 breaks down, the pressure of a water area where a pressure difference control switch SP1 is located is smaller than a set threshold, the pressure difference control switch SP1 is closed, an induction control branch is conducted, a coil K1 of an intermediate relay is electrified, a first contact K1-13 and a second contact K1-23 of the intermediate relay are both closed, a coil KM2-A of a second relay is electrified through a first contact K1-13 of the intermediate relay, and a coil KM2-A of the second relay attracts a main contact KM2, a first auxiliary contact KM2-13 and a second auxiliary contact KM2-23 of the second relay;
after the main contact KM2 of the second relay is sucked, the second circulating pump M2 is put into work; the first auxiliary contact KM2-13 of the second relay is attracted and connected with the first contact K1-13 of the intermediate relay in parallel, so that the coil KM2-A of the second relay is stably and reliably electrified; after the second circulating pump M2 replaces the first circulating pump M1 to work, the pressure of the water area where the pressure difference control switch SP1 is located is recovered to be larger than or equal to a set threshold value, the pressure difference control switch SP1 is disconnected, a coil K1 of the intermediate relay is de-energized, a first contact K1-13 and a second contact K1-23 of the intermediate relay are both disconnected, a coil KM2-A of the second relay is energized through a first auxiliary contact KM2-13 of the second relay, and the second circulating pump M2 continues to work; the second auxiliary contact KM2-23 of the second coil is attracted, so that the time delay relay KT1 is ensured to be electrified, and when the second circulating pump M2 runs to a set first time value, the auxiliary contact KT1-13 of the time delay relay is attracted;
when the second circulating pump M2 breaks down, the pressure of the water area where the pressure difference control switch SP1 is located is smaller than a set threshold value, the pressure difference control switch SP1 is closed, the coil K1 of the intermediate relay is electrified, the first contact K1-13 and the second contact K1-23 of the intermediate relay are both closed, the coil KM1-A of the first relay is electrified through the second contact K1-23 of the intermediate relay, and therefore the coil KM1-A of the first relay attracts the main contact KM1, the first auxiliary contact KM1-13 and the second auxiliary contact KM 1-23.
The main contact KM1 is sucked, the first circulating pump M1 is put into operation, the first auxiliary contact KM1-13 is connected with the second auxiliary contact K1-23 of the intermediate relay in parallel, and the coil KM1-A is ensured to be stably and reliably electrified; with the first circulating pump M1 replacing the second circulating pump M2 to work, the pressure of the water area where the pressure difference control switch SP1 is located is recovered to be larger than or equal to a set threshold, the pressure difference control switch SP1 is disconnected, the coil K1 of the intermediate relay is de-energized, the first contact K1-13 and the second contact K1-23 of the intermediate relay are both disconnected, the coil KM1-A of the first relay maintains the energized state through the first auxiliary contact KM1-13 of the first relay, and the first circulating pump M1 continues to work.
In this embodiment, when the second circulation pump M2 is put into operation, the first circulation pump M1 can be overhauled online without affecting the operation of the working conditions; similarly, when the first circulating pump M2 is put into operation, the second circulating pump M2 can be overhauled on line without affecting the operation of the working condition. In this embodiment, after first circuit breaker QF1 and first circuit breaker QF2 are closed, only need press first control switch SB1, alright starting circuit realizes the fault switch of first circulating pump M1 and second circulating pump M2 to guarantee the reliability of operating mode operation, provide the condition for the maintenance of trouble pump.
In the embodiment, a coil KM1-A of the first relay is connected with a first indicator lamp HL1 in parallel, and a coil KM2-A of the second relay is connected with a second indicator lamp HL2 in parallel. The first indicator lamp HL1 is lightened under the power-on state of the coil KM1-A of the first relay, and the second indicator lamp HL2 is lightened under the power-on state of the coil KM2-A of the second relay. As such, the operating states of the first and second relays, i.e., the operating states of the first and second circulation pumps M1 and M2, respectively, may be indicated by the first and second indicator lamps HL1 and HL2, respectively.
Example 3
Referring to fig. 3, in addition to embodiment 2, this embodiment further includes a second control switch SB2, a third control switch SB3, and a fourth control switch SB 4. The second control switch SB2 is connected in series between the first end of the first branch and the live line L, and the fourth control switch SB4 is connected in series between the first end of the second branch and the live line L. The second end of the first branch and the second end of the second branch are both connected with a zero line.
Therefore, after the coil KM1-A of the first relay is powered on, the button SB4 can be disconnected, so that the coil KM2-A of the second relay is powered off, the main contact KM2 is disconnected, the second circulating pump M2 is completely withdrawn, and the second circulating pump M2 is conveniently overhauled. Similarly, after the coil KM2-A of the second relay is powered on, the button second control switch SB2 can be turned off, so that the coil KM1-A of the first relay is powered off, the main contact KM1 is turned off, the first circulating pump M1 is completely withdrawn, and the first circulating pump M1 is conveniently overhauled.
In this embodiment, for convenience of operation, the second control switch SB2 and the fourth control switch SB4 are both normally closed switches. Therefore, when the circuit is started, the second control switch SB2 and the fourth control switch SB4 do not need to be operated, and the operation difficulty of the machine seal cooling water recycling and stabilizing water supply device is simplified.
The third control switch SB3 is connected in parallel with the first auxiliary contact KM2-13 of the second relay, i.e. the first end of the third control switch SB3 is connected to the first end of the first auxiliary contact KM2-13 of the second relay, and the second end of the third control switch SB3 is connected to the second end of the first auxiliary contact KM2-13 of the second relay.
As described above, in example 1, at the time of startup, when the first control switch SB1 is pressed, the first circulation pump M1 is preferentially used as the main pump; in this embodiment, at the time of start-up, after the first control switch SB1 is pressed, the first circulation pump M1 is preferentially put into use as a main pump; at the time of startup, third control switch SB3 may be pressed to preferentially use second circulation pump M2 as the main pump.
In this embodiment, through the setting of third control switch SB3, the circuit structure of symmetry formula has been realized for first circulating pump M1 and second circulating pump M2's control is more nimble reliable.
Example 4
The stable water supply device of machine seal cooling water cyclic utilization that this embodiment proposed, on the basis of embodiment 1, the output of first circulating pump M1 is equipped with first check valve 5, the output of second circulating pump M2 is equipped with second check valve 6. First check valve 5 and second check valve 6's setting for the control of first circulating pump M1 and second circulating pump M2 place branch road is more nimble, is favorable to under non-operating condition, prevents that first circulating pump M1 and second circulating pump M2 from unexpected the start.
In this embodiment, the circulating water tank 1 is further connected with a supplementing pipeline 4, the supplementing pipeline 4 is used for supplementing the circulating water tank 1 with process water, and the supplementing pipeline 4 is provided with an adjusting valve 7. The setting of the regulating valve 7 is favorable for controlling the flow rate of the process water supplemented into the circulating water tank 1, thereby ensuring the stability of the water flow and the cold quantity of the machine seal cooling water supply of the whole system.
In specific implementation, in order to further ensure the controllability of the process water supplement of the circulating water tank 1, a stop valve such as a ball valve can be further arranged on the supplement pipeline 4. Similarly, in this embodiment, the delivery pipe 2 and the return pipe 3 are further provided with a first valve 8 and a second valve 9, respectively.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a water supply installation is stabilized in machine sealing cooling water cyclic utilization which characterized in that includes: the device comprises a circulating water tank (1), a first circulating pump (M1), a second circulating pump (M2), a pressure difference control module, a conveying pipeline (2) and a return pipeline (3); the input end of the first circulating pump (M1) and the input end of the second circulating pump (M2) are both connected with the output end of the circulating water tank (1), the output end of the first circulating pump (M1) and the output end of the second circulating pump (M2) are both connected with the first end of the conveying pipeline (2), and the second end of the return pipeline (3) is connected with the input end of the circulating water tank (1); the second end of the conveying pipeline (2) and the first end of the return pipeline (3) are used for connecting field equipment;
the control end of the first circulating pump (M1) and the control end of the second circulating pump (M2) are both connected with a pressure difference control module, and the pressure difference control module carries out interlocking control on the first circulating pump (M1) and the second circulating pump (M2) according to the pressure in the conveying pipeline (2).
2. The machine seal cooling water recycling stable water supply device of claim 1, wherein the differential pressure control module comprises: a first relay, a second relay, a time delay relay, an intermediate relay, a pressure difference control switch (SP1) and a first control switch (SB 1); the main contact (KM1) of the first relay is connected with the control end of the first circulating pump (M1) in series, and the main contact (KM2) of the second relay is connected with the control end of the second circulating pump (M2) in series;
a coil (KM1-A) of the first relay is connected in series with a first control switch (SB1) and is marked as a first branch circuit, and the first branch circuit is connected between a live wire (L) and a zero wire (N); the first auxiliary contact (KM1-13) of the first relay is connected with the first control switch (SB1) in parallel;
a coil (KM2-A) of the second relay is connected in series with a first auxiliary contact (KM2-13) of the second relay and is marked as a second branch, and the second branch is connected between a live wire (L) and a zero wire (N); a coil (KT1) of the time delay relay and a second auxiliary contact (KM1-23) of the first relay are connected in series between a live wire (L) and a zero wire (N), and a second auxiliary contact (KM2-23) of the second relay is connected in parallel with a second auxiliary contact (KM1-23) of the first relay;
the first contact (K1-13) of the intermediate relay is connected with the coil (KM2-A) of the second relay in series and is recorded as a third branch, and the third branch is connected with the first branch in parallel; the second contact (K1-23) of the intermediate relay is connected with the coil (KM1-A) of the first relay in series to form a fourth branch, and the fourth branch is connected with the second branch in parallel;
a coil (K1) of the intermediate relay, a contact (KT1-13) of the delay relay and a voltage difference control switch (SP1) are connected in series between a live wire (L) and a zero wire (N); the pressure difference control switch (SP1) is a normally open switch, a detection end (P1) of the pressure difference control switch (SP1) is used for detecting the pressure in the conveying pipeline (2), and the pressure difference control switch (SP1) is used for being closed when the pressure detected by the detection end (P1) is smaller than a set threshold value;
the main contact (KM1), the first auxiliary contact (KM1-13) and the second auxiliary contact (KM1-23) of the first relay are both normally open contacts, the main contact (KM2), the first auxiliary contact (KM2-13) and the second auxiliary contact (KM2-23) of the second relay are both normally open contacts, the first contact (K1-13) and the second contact (K1-23) of the intermediate relay are normally open contacts, and the contact (KT1-13) of the time delay relay is a normally open contact; a coil (KM1-A) of the first relay attracts a main contact (KM1), a first auxiliary contact (KM1-13) and a second auxiliary contact (KM1-23) in the electrified state; a coil (KM2-A) of the second relay is attracted to a main contact (KM2), a first auxiliary contact (KM2-13) and a second auxiliary contact (KM2-23) in an electrified state; a coil (K1) of the intermediate relay attracts a first contact (K1-13) and a second contact (K1-23) of the intermediate relay in an electrified state; after a coil (KT1) of the time delay relay is electrified, the contact (KT1-13) is attracted in a time delay way.
3. The machine-sealed cooling water recycling stable water supply device according to claim 2, further comprising a second control switch (SB2) and a fourth control switch (SB4), wherein the first branch is connected to the live wire (L) or the neutral wire (N) through the second control switch (SB2), and the second branch is connected to the live wire (L) or the neutral wire (N) through the fourth control switch (SB 4).
4. The machine-sealed cooling water recycling stable water supply device according to claim 3, wherein the second control switch (SB2) and the fourth control switch (SB4) are both normally closed switches.
5. The machine seal cooling water recycling stable water supply device according to claim 2 or 3, characterized by further comprising a third control switch (SB3), wherein the third control switch (SB3) is connected in parallel with the first auxiliary contact (KM2-13) of the second relay.
6. The machine-sealed cooling water recycling stable water supply device as claimed in claim 2, wherein the branch where the control end of the first circulating pump (M1) is located is further connected in series with a first motor protector (F1), and the contact (F1-1) of the first motor protector is connected in series on the first branch; a branch where the control end of the second circulating pump (M2) is also connected with a second motor protector (F2) in series, and a contact (F2-1) of the second motor protector is connected on the second branch in series; the contact (F1-1) of the first motor protector and the contact (F2-1) of the second motor protector are both normally closed contacts.
7. The machine-sealed cooling water recycling stable water supply device according to claim 2 or 6, characterized in that the branch where the control end of the first circulating pump (M1) is located is further connected in series with a first circuit breaker (QF1), and the branch where the control end of the second circulating pump (M2) is located is further connected in series with a second circuit breaker (QF 2).
8. The machine-sealed cooling water recycling stable water supply device as claimed in claim 2, characterized in that the coil (KM1-a) of the first relay is connected in parallel with a first indicator lamp (HL1), and the coil (KM2-a) of the second relay is connected in parallel with a second indicator lamp (HL 2).
9. The machine-sealed cooling water recycling stable water supply device according to claim 1, wherein the output end of the first circulating pump (M1) is provided with a first check valve (5), and the output end of the second circulating pump (M2) is provided with a second check valve (6).
10. The machine seal cooling water recycling stable water supply device according to claim 1, characterized in that the circulating water tank (1) is further connected with a supplementary pipeline (4), the supplementary pipeline (4) is used for supplementing the circulating water tank (1) with process water, and the supplementary pipeline (4) is provided with a regulating valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122664617.1U CN216741949U (en) | 2021-11-01 | 2021-11-01 | Stable water supply device for recycling machine seal cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122664617.1U CN216741949U (en) | 2021-11-01 | 2021-11-01 | Stable water supply device for recycling machine seal cooling water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216741949U true CN216741949U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122664617.1U Active CN216741949U (en) | 2021-11-01 | 2021-11-01 | Stable water supply device for recycling machine seal cooling water |
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| Country | Link |
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| CN (1) | CN216741949U (en) |
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2021
- 2021-11-01 CN CN202122664617.1U patent/CN216741949U/en active Active
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