Slurry pump blockage alarm system

Abstract

The invention provides a slurry pump blockage alarm system, which comprises a current detection loop, a control main circuit, a first control branch circuit and an alarm branch circuit, and is characterized in that the current detection loop is configured to be connected into a motor operation main circuit for controlling the operation of a slurry pump and is used for detecting and displaying the working current of the slurry pump; the control main circuit is used for being connected when the motor operation main circuit operates so that the first control branch circuit can be in a to-be-operated state, and the first control branch circuit is used for controlling the alarm branch circuit to be closed when the working current of the slurry pump reaches an alarm value so that the alarm branch circuit can give an alarm. According to the system, the problem of blockage of the slurry pump is converted into the problem of change of the current of the motor according to the proportion corresponding relation of the decrease of the current of the motor, the concentration of the slurry and the flow speed of the slurry, so that blockage alarm of the slurry pump is realized.

Description

Technical Field

[0001] The invention relates to the field of slurry pump anti-blocking, and in particular to a slurry pump blockage alarm system. Background Art

[0002] Slurry pumps are widely used in metallurgy, mining, electric power, coal mining, water conservancy, chemical industry, light industry, petroleum and other departments. They are often used to transport concentrated liquid, thick oil, oil residue, dirty liquid, mud, mortar, quicksand and flowing sludge in urban sewage ditches. Since these liquids often contain a large amount of mud, sand, large-particle slurry, etc., if the slurry concentration is high and the particles are large, the slurry pump is easy to get blocked. It takes at least 2 hours to clean up the slurry pump after it is blocked. When the blockage is serious, the pump needs to be disassembled or a hole needs to be opened in the pipeline, which will take longer and have a greater impact on production. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the related art, an object of the present invention is to provide a slurry pump blockage alarm system for preventing the slurry pump from being blocked.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a slurry pump blockage alarm system, including a current detection circuit, a control main circuit, a first control branch and an alarm branch. The current detection circuit is configured to be connected to the motor operation main circuit that controls the operation of the slurry pump, and is used to detect and display the working current of the slurry pump. The control main circuit is used to be connected when the motor operation main circuit is running to put the first control branch in a standby state. The first control branch is used to control the closure of the alarm branch when the working current of the slurry pump reaches the alarm value, so that the alarm branch can alarm.

[0005] Optionally, the control main circuit includes a control switch and a time relay connected in series, the control switch is used to control the on and off of the control main circuit, the time relay includes a first main contact, the first main contact is connected in series to the first control branch, the control switch is closed when the motor is running to energize the coil of the time relay, and the first main contact is closed.

[0006] Optionally, the first main contact is a delayed closing contact.

[0007] Optionally, the current detection circuit includes a conversion device and a display alarm device, the conversion device is used to convert the current size to meet the use of the display alarm device, and the display alarm device is used to display the current and to set the alarm value of the current.

[0008] Optionally, the first control branch includes a normally closed reset switch and a first relay, the first relay includes an alarm start contact, the display alarm device includes a first alarm contact, the alarm start contact is connected in series to the alarm branch, and the normally closed reset switch, the first relay, the first main contact and the first alarm contact constitute the first control branch; when the working current of the slurry pump reaches the alarm value, the first alarm contact closes, and the first control branch forms a path to energize the coil of the first relay, and the alarm start contact closes, causing the alarm branch to alarm.

[0009] Optionally, the first relay further includes a self-locking contact, which is connected in parallel with the first alarm contact. The self-locking contact and the alarm contact are closed simultaneously, so that the alarm branch continues to alarm until the normally closed reset switch is pressed.

[0010] Optionally, the alarm branch includes an alarm component and a test switch connected in series, the test switch is used to test the alarm component, and the alarm start contact and the test switch are connected in parallel.

[0011] Optionally, the alarm member sounds an alarm through at least one of sound or light.

[0012] Optionally, the slurry pump blockage alarm system also includes a second control branch, the second control branch includes a normally open reset switch and a second relay, the normally open reset switch is linked with the normally closed reset switch, the time relay also includes a second main contact, the display alarm device also includes a second alarm contact, the second relay includes a passage contact and a circuit breaker contact, the normally open reset switch, the passage contact, the second relay, the second main contact and the second alarm contact form the second control branch, wherein the normally open reset switch, the second relay, the second main contact and the second alarm contact are connected in series, the passage contact is connected in parallel with the normally open reset switch, and the circuit breaker contact is connected in series with the first control branch; when the working current of the slurry pump reaches the alarm value, the second alarm contact and the first alarm contact are closed at the same time, and the normally closed reset switch is triggered at this time, so that the normally closed reset switch is opened and the normally open reset switch is closed, so that the second relay is energized, and at the same time, the passage contact is closed and the circuit breaker contact is opened, the first relay is de-energized, and the alarm branch stops alarming.

[0013] As described above, the slurry pump blockage alarm system of the present invention has the following beneficial effects: the present invention converts the blockage problem of the slurry pump into a problem of change in the motor current according to the proportional correspondence between the decrease in motor current and the concentration and flow rate of the slurry, thereby realizing the slurry pump blockage alarm. The present invention has a simple structure, is easy to implement, and the alarm setting can be adjusted according to the working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a circuit diagram of a slurry pump blockage alarm system according to an embodiment of the present invention.

[0015] Figure 2 Shown is a circuit diagram of a current detection circuit connected to a main circuit of a motor in an embodiment of the present invention.

[0016] Component number description

[0017] 1. Control switch; 2. Time relay; 3. First main contact; 4. Normally closed reset switch; 5. First relay; 6. Alarm start contact; 7. First alarm contact; 8. Self-locking contact; 9. Test switch; 10. Alarm bell; 11. Fault light; 12. Normally open reset switch; 13. Second relay; 14. Second main contact; 15. Second alarm contact; 16. Pass contact; 17. Break contact; 20. Conversion device; 30. Display alarm device. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0019] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0020] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0021] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0022] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0023] like Figure 1 As shown, this embodiment provides a slurry pump blockage alarm system, which prevents the slurry pump from being blocked by monitoring the working current of the slurry pump.

[0024] The slurry pump blockage alarm system includes a current detection circuit, a control main circuit, a first control branch and an alarm branch. The current detection circuit is configured to be connected to the motor operation main circuit that controls the operation of the slurry pump. The current detection circuit is used to detect and display the working current of the slurry pump. The control main circuit is used to be connected when the motor operation main circuit is running to put the first control branch in a standby state. The first control branch is used to control the closure of the alarm branch when the working current of the slurry pump reaches the alarm value, so that the alarm branch can alarm.

[0025] The control main route of this embodiment is controlled by the motor operation main route. When the motor in the motor operation main route is running, the control main route is in the connection state. When the motor in the motor operation main route stops running, the control main route is in the disconnection state. The motor is used to drive the slurry pump to operate. When the motor is running, the slurry pump is in the working state. At this time, the control main route is in the connection state, so that the first control branch is in the waiting state. If the slurry concentration increases, the flow rate of the slurry in the pipeline will slow down. At this time, the conveying capacity of the slurry pump decreases, and the motor current also decreases, that is, the working current of the slurry pump decreases. If the slurry concentration is higher, the motor current decreases more. The decrease in motor current is basically proportional to the concentration and flow rate of the slurry. When the motor current drops to a certain value, the slurry pump is blocked. Since the current detection circuit can detect the working current of the slurry pump, when the working current drops to the alarm value, the first control branch controls the alarm branch to alarm, so that the construction personnel can check and repair the blockage point in advance, thereby achieving the purpose of preventing the slurry pump from being blocked.

[0026] like Figure 2As shown, the current detection circuit includes a conversion device 20 and a display alarm device 30. The conversion device 20 and the display alarm device 30 are connected to the main circuit of the motor. When the motor is running, the conversion device 20 detects the large current in the circuit and converts it into a micro current to meet the use of the display alarm device 30. The display alarm device 30 is used to display the current size and to set the alarm value of the current.

[0027] In actual working conditions, since the current of the motor is usually large when it is working, and the current of the display alarm device 30 is small when it is working, the current mismatch will occur when the motor and the display alarm device 30 are connected to the same system. At this time, a conversion device 20 is set in the system. By using the conversion device 20, the large current of the motor can be converted into a standard detection micro current of 4-20mA, thereby meeting the use of the display alarm device 30. There are two ways for the conversion device 20 to convert current: for example, the conversion device 20 includes a current transformer and a current transmitter. The current transformer converts a large current of hundreds of amperes into a small current of 0-5A, and then the current transmitter converts the small current of 0-5A into a micro current of 4-20mA. For another example, a device that can directly convert a large current of hundreds of amperes into a micro current of 4-20mA can also be selected. In this embodiment, the conversion device 20 uses Fusheng Yilida P8651A121, 0-300A, 24VDC. In this embodiment, the control main circuit also includes a 24V power supply, which is used to supply the conversion device 20.

[0028] During the use of the display alarm device 30, on the one hand, the display alarm device 30 can convert the microcurrent of 4-20mA into a digital display, so that the equipment operator can understand the current current size. On the other hand, the display alarm device 30 can set the upper and lower limits of the alarm. In this embodiment, the display alarm device 30 only needs to set the lower limit of the alarm. When the working current of the motor drops to the alarm value of the display alarm device 30, the display alarm device 30 will generate an alarm signal. At this time, the first control branch controls the alarm branch to alarm. The display alarm device 30 selected in this embodiment is XMTA-100, 0-500A, 220VAC.

[0029] The control main circuit includes a control switch 1 and a time relay 2 connected in series. The control switch 1 comes from a relay or contactor in the motor operation main circuit. The control switch 1 can be an auxiliary contact of the relay or contactor in the motor operation main circuit. The control switch 1 is used to control the on and off of the control main circuit. When the motor is running, the control switch 1 is closed. The time relay 2 includes a first main contact 3, which is connected in series to the first control branch. When the motor operation main circuit starts, the control switch 1 is closed, the control main circuit is in a pass state, the time relay 2 is in an energized state, and the coil of the time relay 2 is energized, so that the first main contact 3 is closed.

[0030] In this embodiment, the first main contact 3 is a delayed closing contact, and the first main contact 3 is in a normally open state. When the motor starts, the current value changes from small to large. At this time, the small current value when the motor starts will be within the set alarm value range, and the display alarm device 30 will generate an alarm signal. In order to avoid false alarms, the first main contact 3 can be delayed to close to avoid false alarms during the motor starting process.

[0031] The first control branch includes a normally closed reset switch 4 and a first relay 5, the first relay 5 includes an alarm start contact 6, the alarm start contact 6 is connected in series to the alarm branch, the display alarm device 30 includes a first alarm contact 7, the normally closed reset switch 4, the first relay 5, the first main contact 3 and the first alarm contact 7 constitute the first control branch.

[0032] During the operation of the slurry pump, if the working current of the motor drops to the alarm value, the display alarm device 30 will generate an alarm signal, that is, the first alarm contact 7 is closed. At this time, the first control branch forms a passage, so that the coil of the first relay 5 is energized. After the coil of the first relay 5 is energized, the alarm start contact 6 is closed, thereby causing the alarm branch to alarm.

[0033] In this embodiment, the first relay 5 also includes a self-locking contact 8, which is connected in parallel with the first alarm contact 7. When the first control branch forms a path so that the coil of the first relay 5 is energized, the self-locking contact 8 and the alarm contact are closed at the same time. Under the action of the self-locking contact 8, the first control branch can still be in a path state, so that the first relay 5 is always in a energized state, preventing the alarm output from being intermittent when the motor current fluctuates near the alarm value.

[0034] The alarm branch includes an alarm component and a test switch 9 connected in series. The test switch is used to test the alarm component. The alarm start contact 6 and the test switch 9 are connected in parallel. The alarm component alarms by at least one of sound or light. In this embodiment, the alarm component includes an alarm bell 10 and a fault light 11. The operator can trigger the test switch 9 to test whether the alarm bell 10 and the fault light 11 can be used normally.

[0035] The slurry pump blockage alarm system also includes a second control branch, which includes a normally open reset switch 12 and a second relay 13. The normally open reset switch 12 is linked to the normally closed reset switch 4. The time relay 2 also includes a second main contact 14. The display alarm device 30 also includes a second alarm contact 15. The second relay 13 includes a passage contact 16 and a circuit breaker contact 17. The passage contact 16 is in a normally open state, and the circuit breaker contact 17 is in a normally closed state. The normally open reset switch 12, the passage contact 16, the second relay 13, the second main contact 14 and the second alarm contact 15 form a second control branch, wherein the normally open reset switch 12, the second relay 13, the second main contact 14 and the second alarm contact 15 are connected in series, the passage contact 16 is connected in parallel with the normally open reset switch 12, and the circuit breaker contact 17 is connected in series with the first control branch.

[0036] During the operation of the slurry pump, if the working current of the motor reaches the alarm value, the display alarm device 30 will generate an alarm signal, that is, the second alarm contact 15 and the first alarm contact 7 are closed at the same time. At this time, the normally closed reset switch 4 is manually triggered, and the normally closed reset switch 4 and the normally open reset switch 12 act together, so that the normally closed reset switch 4 is disconnected and the normally open reset switch 12 is closed. When the normally open reset switch 12 is closed, the second relay 13 is energized, the passage contact 16 is closed and the circuit breaker contact 17 is disconnected. At this time, the first relay 5 loses power, so that the alarm branch stops alarming. It should be noted that after the normally closed reset switch 4 is disconnected and the normally open reset switch 12 is closed, the normally closed reset switch 4 will resume the closed state and the normally open reset switch 12 will resume the open state. The second control branch is used to stop the alarm to prevent the alarm from being in the alarm state for a long time. If the current value recovers to above the alarm value, the second alarm contact 15 will automatically disconnect.

[0037] In summary, the implementation process of the slurry pump blockage alarm system of this embodiment is as follows: when the motor is running, the control switch 1 is closed, at this time the control main circuit is in the access state, and the coil of the time relay 2 is energized. After the time relay 2 is energized, the first main contact 3 and the second main contact 14 are closed, wherein the first main contact 3 is a delayed closure and the second main contact 14 is an instantaneous closure. When the slurry concentration increases and the current of the motor drops to the alarm value, the display alarm device 30 will generate an alarm signal, that is, the first alarm contact 7 and the second alarm contact 15 are closed, at this time, the coil of the first relay 5 is energized, and then the alarm start contact 6 is closed, the alarm branch circuit forms a access, and the alarm component sends an alarm. When the operator learns of the alarm information, he can manually trigger the normally closed reset switch 4. At this time, the normally closed reset switch 4 is disconnected, the normally open reset switch 12 is closed, a passage appears in the second control branch, the coil of the second relay 13 is energized, the passage contact 16 on the second relay 13 is closed, and the circuit breaker contact 17 is disconnected, so that the first control branch is in an open circuit state. When the coil of the first relay 5 loses power, the alarm start contact 6 is disconnected, and the alarm component stops alarming.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A slurry pump blockage alarm system, characterized in that: It includes a current detection circuit, a control main circuit, a first control branch and an alarm branch. The current detection circuit is configured to be connected to the motor operation main circuit that controls the operation of the slurry pump, and is used to detect and display the working current of the slurry pump. The control main circuit is used to be connected when the motor operation main circuit is running to put the first control branch in a standby state. The first control branch is used to control the closure of the alarm branch when the working current of the slurry pump reaches the alarm value, so that the alarm branch can realize an alarm.

2. The slurry pump blockage alarm system according to claim 1, characterized in that: The control main circuit includes a control switch and a time relay connected in series. The control switch is used to control the on and off of the control main circuit. The time relay includes a first main contact. The first main contact is connected in series to the first control branch. When the motor is running, the control switch is closed to energize the coil of the time relay and the first main contact is closed.

3. The slurry pump blockage alarm system according to claim 2, characterized in that: The first main contact is a delayed closing contact.

4. The slurry pump blockage alarm system according to claim 2, characterized in that: The current detection circuit includes a conversion device and a display alarm device. The conversion device is used to convert the current size to meet the use of the display alarm device. The display alarm device is used to display the current and to set the alarm value of the current.

5. The slurry pump blockage alarm system according to claim 4, characterized in that: The first control branch includes a normally closed reset switch and a first relay, the first relay includes an alarm start contact, the alarm start contact is connected in series to the alarm branch, the display alarm device includes a first alarm contact, the normally closed reset switch, the first relay, the first main contact and the first alarm contact constitute the first control branch; When the working current of the slurry pump reaches the alarm value, the first alarm contact is closed, the first control branch forms a path, so that the coil of the first relay is energized, the alarm start contact is closed, and the alarm branch alarms.

6. The slurry pump blockage alarm system according to claim 5, characterized in that: The first relay also includes a self-locking contact, which is connected in parallel with the first alarm contact. The self-locking contact and the alarm contact are closed simultaneously, so that the alarm branch continues to alarm until the normally closed reset switch is pressed.

7. The slurry pump blockage alarm system according to claim 5, characterized in that: The alarm branch circuit includes an alarm component and a test switch connected in series, wherein the test switch is used to test the alarm component, and the alarm start contact and the test switch are connected in parallel.

8. The slurry pump blockage alarm system according to claim 7, characterized in that: The alarm member alarms through at least one of sound or light.

9. The slurry pump blockage alarm system according to claim 5, characterized in that: The slurry pump blockage alarm system also includes a second control branch, the second control branch includes a normally open reset switch and a second relay, the normally open reset switch is linked with the normally closed reset switch, the time relay also includes a second main contact, the display alarm device also includes a second alarm contact, the second relay includes a pass contact and a break contact, the normally open reset switch, the pass contact, the second relay, the second main contact and the second alarm contact form the second control branch, wherein the normally open reset switch, the second relay, the second main contact and the second alarm contact are connected in series, the pass contact is connected in parallel with the normally open reset switch, and the break contact is connected in series with the first control branch; When the working current of the slurry pump reaches the alarm value, the second alarm contact and the first alarm contact are closed at the same time, and the normally closed reset switch is triggered at this time, so that the normally closed reset switch is opened and the normally open reset switch is closed, so that the second relay is energized, and at the same time the passage contact is closed and the circuit breaker contact is opened, the first relay loses power, and the alarm branch stops alarming.

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