A leak early warning instrument for a pump packing

Abstract

This invention relates to a packing leak early warning device for a booster pump, belonging to the field of booster pump technology. The device includes: an early warning control circuit and a housing for collecting leaking liquid from the booster pump packing. A liquid level sensor is installed inside the housing to detect the liquid level. A baffle plate is positioned below the inlet of the housing, dividing the housing into an inlet chamber communicating with the inlet and a sensing chamber for housing the liquid level sensor. A channel connecting the inlet chamber and the sensing chamber is provided on the baffle plate near the bottom wall of the housing. This invention can reduce false alarms when a packing leak occurs.

Description

Technical Field

[0001] This invention relates to an early warning device for packing leakage in a booster pump, belonging to the field of booster pump technology. Background Technology

[0002] To maintain reservoir pressure, water needs to be injected underground, and the injection pump is a key piece of equipment for this purpose. As the packing of the injection pump wears down over time, failure to detect this wear can lead to pump oil emulsification and reduced pump efficiency. Currently, the pump requires personnel to inspect it every two hours, which is not only wasteful of manpower and dangerous, but also lacks intelligence.

[0003] Chinese utility model patent publication number CN205665829U discloses a packing leak alarm for a water injection pump. This alarm includes a level relay and an intermediate relay. The power supply terminals of the level relay are connected to the live wire (L) and neutral wire (N) of the power supply. The level electrode terminals of the level relay are located inside the plunger box of the water injection pump. The control signal terminals of the level relay are connected to the coil (KA) of the intermediate relay. The device also includes a water injection pump connected to the power supply, a pump stop indicator light (HR), and an alarm (SL). The contacts of the intermediate relay are connected to the pump stop indicator light (HR), the alarm (SL), and the control circuit of the water injection pump. This device has a simple and clear structure, a high degree of automation, and can promptly detect packing leaks even when unattended, automatically triggering an alarm and stopping the pump.

[0004] However, this device uses a float level gauge. When the groundwater has a lot of impurities and high mineralization, salt can easily form at the float when a packing leak occurs, causing the float to sink, distorting the level detection, and triggering a false alarm. Alternatively, when a packing leak occurs, liquid dripping into the open tank can easily splash onto the float, triggering a false alarm. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-warning device for packing leakage in injection pumps, which solves the problem in the prior art that false alarms are easily triggered when packing leakage occurs.

[0006] To achieve the above objectives, the present invention includes: The present invention provides an early warning device for packing puncture of a booster pump, comprising an early warning control circuit and a housing for receiving liquid leaking from the packing of the booster pump. A liquid level sensor and controller is installed in the housing for sensing the liquid level in the housing. A baffle plate is provided below the water inlet of the housing, and the baffle plate divides the housing into a liquid inlet chamber communicating with the water inlet and a sensing chamber for placing the liquid level sensor and controller. The baffle plate near the bottom wall of the tank has a channel for connecting the liquid inlet chamber and the sensing chamber.

[0007] Furthermore, the box includes an open box and an upper cover that fits the open box. The top cover is hinged or overlapped with the open box body.

[0008] Furthermore, the water inlet is located on the top wall of the upper end cover.

[0009] Furthermore, a first short plate is provided on the side wall of the upper end cover; The first short plate is connected to the side wall of the upper end cover by a supporting structure or by hinge. The upper cover also includes an inclined filter plate, one end of which overlaps or is hinged to the other end of the first short plate, and the other end of which overlaps or is hinged to the liquid baffle. The first short plate, the filter plate, and the upper cover form a sedimentation tank at their joint.

[0010] Furthermore, the base of the liquid level sensing and control instrument is fixedly connected to the bottom wall of the housing.

[0011] Furthermore, the probe of the liquid level sensing and control instrument includes at least a high limit probe.

[0012] Furthermore, the liquid level sensing and control instrument also includes a quick connector; The quick connector is located on the outside of the enclosure; The signal line of the high limit probe is connected to the early warning control circuit via a quick connector.

[0013] Furthermore, the early warning control circuit includes: a signal conversion unit, a control unit, a switching unit, and an alarm unit; The control unit includes: an intelligent single-beam beam measuring and control instrument; The signal line of the high limit probe is connected to the control module of the intelligent single-beam beam measuring and control instrument through a signal conversion unit; The control module is connected to the control terminal of the switch unit; The on / off terminal of the switch unit is connected in series with the alarm unit.

[0014] Furthermore, the control unit also includes a relay control circuit for the booster pump; The normally open upper limit contact of the intelligent single beam measuring and control instrument is connected in series with the coil in the relay control circuit of the booster pump; the normally closed contact in the relay control circuit of the booster pump is connected in series with the start / stop control circuit of the booster pump.

[0015] Furthermore, it also includes a flow metering valve installed on the bottom wall of the housing and communicating with the liquid inlet chamber, and a venting solenoid valve installed at the bottom of the side wall of the housing and communicating with the liquid inlet chamber or the sensing chamber. The control end of the venting solenoid valve is connected to the control module of the intelligent single beam measuring and control instrument.

[0016] The beneficial effects of this invention are as follows: As an improved invention, this invention provides a packing gland leak early warning device for injection pumps. By installing a baffle plate inside the tank, the tank is divided into two chambers: one for water inlet and the other for housing the level sensor. The baffle plate prevents water leaking from the packing gland from splashing onto the sensor probe of the level sensor, reducing false alarms. A channel below the baffle plate allows liquid from the inlet chamber to flow into the sensing chamber, improving the accuracy of level measurement by the level sensor. A filter plate filters impurities in the groundwater, reducing salt deposition. By fixing the base of the level sensor to the bottom wall of the tank, the level sensor probe will not sink during salt deposition, reducing level detection distortion and thus minimizing false alarms. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a packing leak early warning device for an injection pump provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an early warning control circuit provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of an external power supply protection circuit provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a step-down chip unit provided in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The concept of this invention lies in the following: In existing technologies, when liquid is poured into an open tank, it is easy for the liquid to splash onto the probe of the level sensor, causing false alarms. Therefore, by setting up two interconnected cavities inside the tank, one for water intake and the other for housing the level sensor, the occurrence of false alarms can be reduced. Furthermore, since groundwater in existing technologies often has high impurities and mineralization, filter plates can be used to filter out these impurities. Also, because existing technologies tend to cause salt buildup at the float, leading to the float sinking and inaccurate level measurements, the level sensor can be fixed within the cavity to prevent it from sinking.

[0020] An embodiment of a pre-existing leak warning device for injection pump packing: Figure 1 This is a schematic diagram of the structure of a packing leak early warning device for an injection pump provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the injection pump packing leak warning device includes: a warning control circuit, a housing 21 for collecting the leaking liquid from the injection pump packing, a liquid level sensor 22 for sensing the liquid level inside the housing 21, a baffle plate 215 below the inlet 213 of the housing 22, the baffle plate 215 dividing the housing 21 into an inlet chamber communicating with the inlet 213 and a sensing chamber for placing the liquid level sensor 22; a channel for connecting the inlet chamber and the sensing chamber is provided on one end of the baffle plate 215 near the bottom wall of the housing 21.

[0021] To facilitate disassembly and allow for modification of the internal structure of the enclosure as needed, as an optional implementation, the enclosure 21 includes an open enclosure and an upper cover adapted to the open enclosure; the upper cover and the open enclosure are detachably connected. The detachable connection can be a hinge, an overlap, etc., and this invention does not impose any particular limitation on it.

[0022] The inlet 213 can be located on any side wall of the box 21 that is connected to the liquid inlet chamber.

[0023] To facilitate the collection of liquid leaking from the packing, as an optional implementation, the inlet 213 can be located on the top wall of the upper end cap, which communicates with the liquid inlet chamber. The present invention does not impose any particular limitation on the location of the inlet 213; the following description will exemplify the inlet 213 being located on the top wall of the upper end cap.

[0024] The upper cover is a hollow shell structure, including a top wall and a side wall perpendicular to the top wall. The top wall is provided with an inlet 213 for collecting the liquid leaked from the packing.

[0025] The position of the baffle plate 215 can be perpendicular to the bottom wall of the box 21, or it can be inclined, etc., depending on the actual needs. In the following embodiments of the present invention, the baffle plate 215 is set perpendicular to the bottom wall of the box 21 as an example for illustrative explanation.

[0026] In this case, the end of the baffle plate 215 away from the water inlet 213 can be directly connected to the bottom wall of the housing 21. In this case, the channel for connecting the liquid inlet chamber and the sensing chamber can be set on the plate of the baffle plate 215 near the bottom wall of the housing 21. Alternatively, the end of the baffle plate 215 away from the water inlet 213 may not be connected to the bottom wall of the housing 21. In this case, the gap between the bottom wall of the housing 21 and the baffle plate 215 forms a channel for connecting the liquid inlet chamber and the sensing chamber.

[0027] Among them, the number of channels used to connect the liquid inlet chamber and the sensing chamber can be multiple when the end of the baffle plate 215 away from the water inlet 213 is directly connected to the bottom wall of the tank 21. However, each channel must avoid the probe of the liquid level sensing and control instrument 22 in the sensing chamber to ensure that the baffle plate can prevent liquid from splashing onto the probe.

[0028] The liquid level sensor 22 is fixedly connected to the bottom wall of the housing 21 via its base 221. The probe of the liquid level sensor 22 is fixed to its support rod 222, and the support rod 222 and the base 221 are connected by a plug-in connection. Since the sensor 22 is fixedly connected to the bottom wall of the housing 21, and the probe of the liquid level sensor 22 is also fixedly connected to the support rod 222, compared with the float-type liquid level sensor, when the salinity of the water is high during packing leakage, even if salt deposition occurs on the probe of the liquid level sensor 22, the probe will not sink due to the total amount of water, thus avoiding the problem of inaccurate liquid level measurement.

[0029] The probe of the liquid level sensing and control instrument 22 includes at least one high limit probe 224, so that when the liquid level in the tank 21 reaches the high limit probe 224, the high limit probe 224 can transmit the collected high liquid level signal to the early warning control circuit.

[0030] In order to detect the amount of packing leakage in a timely manner, as another optional implementation, the probe of the liquid level sensing and control instrument 22 may also include a low limit probe 223, so that when the liquid level in the tank 21 reaches the low limit probe 223, the low limit probe 223 can transmit the collected low liquid level signal to the early warning control circuit.

[0031] To reduce the likelihood of the liquid level sensor 22 becoming unusable due to probe damage, as an alternative implementation, the probe of the liquid level sensor 22 may also include a spare probe 225. When the probe of the liquid level sensor 22 only includes the high limit probe 224, the spare probe 225 is a spare probe for the high limit probe 224 and is located below the high limit probe 224. When the probe of the liquid level sensor 22 includes both the high limit probe 224 and the low limit probe 223, the spare probe 225 is located between the high limit probe 224 and the low limit probe 223. If the high limit probe 224 is damaged, the spare probe 225 becomes a spare probe for the high limit probe 224; if the low limit probe 223 is damaged, the spare probe 225 becomes a spare probe for the low limit probe 223.

[0032] The present invention does not impose a particular limitation on the number of probes of the liquid level sensing and control instrument 22, which can be set according to actual needs. The following embodiments of the present invention take the liquid level sensing and control instrument 22 as including a high limit probe 224, a spare probe 225 and a low limit probe 223, and the spare probe 225 being a spare probe of the high limit probe 224 as an example for illustrative purposes.

[0033] The liquid level sensor and controller 22 also includes a quick connector 221 located outside the housing 21, which is used to connect the probe of the liquid level sensor and controller 22 and the early warning control circuit via a signal line.

[0034] Due to the high amount of impurities and mineralization in the groundwater, in order to reduce salt deposition on the probe of the level sensor 22 and improve measurement accuracy, as an optional implementation, an inclined filter plate 214 for filtering impurities can be installed below the inlet 213. Specifically, one end of the filter plate 214 is connected to the baffle plate 215, and the other end of the filter plate 214 is connected to the first short plate 217.

[0035] The first short plate 217 can be mounted on the side wall of the upper cover via a support structure 218, or it can be mounted on the side wall of the open box away from the baffle plate via the support structure 218. The present invention does not specifically limit the position of the first short plate 217. For ease of inspection and replacement, the following description uses the example of the first short plate 217 being mounted on the side wall of the upper cover. The joint of the first short plate 217, the filter plate 214, and the upper cover constitutes a sedimentation tank for storing impurities filtered by the filter plate 214.

[0036] To facilitate cleaning or replacement of the filter plate 214, as an optional implementation, the filter plate 214 and the baffle plate 215 can be overlapped or hinged, and the filter plate 214 and the first short plate 217 can also be overlapped or hinged.

[0037] To facilitate the cleaning of impurities, as an optional implementation, the supporting structure 218 and its connected sidewall can be connected by an overlapping or hinged connection.

[0038] As an optional implementation, a flow metering valve 212 is also included, which is disposed on the bottom wall of the housing 21 and communicates with the inlet chamber. The opening degree of the flow metering valve 212 can be determined according to the leakage of the booster pump. When the flow rate of the liquid entering the housing 21 from the inlet 213 is less than or equal to the opening degree of the flow metering valve 212, the liquid in the housing 21 will remain unchanged. When the flow rate of the liquid entering the housing 21 from the inlet 213 exceeds the opening degree of the flow metering valve 212, the liquid level in the housing 21 will rise continuously. As the leakage increases, the liquid will flow from the inlet chamber into the sensing chamber through the channel.

[0039] The control terminal of the flow metering valve 212 can be manually controlled or electrically controlled, etc. This invention does not impose any particular limitation on the control method of the flow metering valve 212. To improve intelligence, the following explanation will use electrically controlled flow metering valve 212 as an example. When the flow metering valve 212 is electrically controlled, its control terminal is connected to the warning control circuit via a signal line.

[0040] As an optional implementation, the flow metering valve 212 can also trigger an alarm in the early warning control circuit when the liquid level in the tank 21 reaches a preset height, and increase the opening of the flow metering valve 212 in conjunction with the liquid level in the tank 21 so that the liquid in the tank 21 can be discharged as soon as possible. After the liquid in the tank 21 is discharged, the original opening is restored.

[0041] To further accelerate the drainage of liquid within the tank 21, as an optional implementation, a venting solenoid valve 211 is also included, located at the bottom of the side wall of the tank 21 and communicating with the liquid inlet chamber or sensing chamber. The control terminal of the venting solenoid valve 211 is connected to a warning control circuit. When the liquid level in the tank 21 reaches a preset height, the warning control circuit alarms and activates the venting solenoid valve 211 to open, thereby accelerating the drainage of liquid. The present invention does not specifically limit the model of the venting solenoid valve 211; this embodiment uses a 2W250-25 model as an example for illustrative purposes.

[0042] In order to better fix the base 221 and reduce the problem of inaccurate liquid level measurement caused by the floating of the base 221 due to the buoyancy of the liquid, and in order to block impurities and reduce the occurrence of impurities entering the sensing cavity, as an optional implementation, a lower baffle plate 216 for splash prevention is provided around the base 211.

[0043] The following is combined with Figures 1-4 A detailed introduction to the early warning control circuit.

[0044] Figure 2 This is a schematic diagram of the structure of an early warning control circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the early warning control circuit includes: a signal conversion unit 6, a control unit 1, a switch unit 5, and an alarm unit 7.

[0045] The control unit 6 includes an intelligent single beam beam measuring and control instrument. This invention does not specifically limit the model of the intelligent single beam beam measuring and control instrument; however, the following description uses the T80 model (hereinafter referred to as the T80 intelligent single beam beam measuring and control instrument) as an example.

[0046] The signal conversion unit 6 includes a number of transmitters for converting liquid level signals into electrical signals, which is consistent with the number of probes in the liquid level sensing and control instrument 22. Each transmitter corresponds to one probe.

[0047] The switching unit 5 includes a number of switching tubes that are the same as the number of probes of the liquid level sensing and control instrument 22, with each switching tube corresponding to one probe.

[0048] The alarm unit 7 can be any one of sound, light, and electricity, or any combination of the three. This invention does not impose any particular limitation on this. To save costs, the following description uses an alarm unit 7 including a first light-emitting unit 241 and a second light-emitting unit 242 as an example. The number of light-emitting units corresponds to the number of probes in the liquid level sensing and control instrument 22, with each light-emitting unit corresponding to one probe. The light-emitting unit can be a light-emitting diode (LED), or other alarm indicator lights, etc. This invention does not impose any particular limitation on this. The following description uses an example where the light-emitting unit includes an LED, i.e., the first light-emitting unit 241 includes a first light-emitting diode LED5, and the second light-emitting unit 242 includes a second light-emitting diode LED2.

[0049] The following example illustrates the following: the probes of the induction measuring and control instrument 22 include a high limit probe 224 and a low limit probe 223; the signal conversion unit 6 includes a first transmitter and a second transmitter; the switching unit 5 includes a first switch tube 231 and a second switch tube 232; and the alarm unit 7 includes a first light-emitting unit 241 and a second light-emitting unit 242.

[0050] Specifically, the high limit probe 224 and the low limit probe 223 are both connected to the first transmitter and the second transmitter respectively via quick connector 221. The output terminals of the first transmitter and the second transmitter are both connected to the control module of the T80 intelligent single beam beam measuring and control instrument. The output terminal of the control module of the T80 intelligent single beam beam measuring and control instrument is connected to the control terminal of the first switch tube 231 and the second switch tube 232 respectively. The first switch tube 231 corresponds to the high limit probe 224, and the second switch tube 232 corresponds to the low limit probe 223. The first light-emitting unit 241 is connected in series at the on / off terminal of the first switch tube 231, and the second light-emitting unit 242 is connected in series at the on / off terminal of the second switch tube 242.

[0051] The switching transistor may include a metal-oxide-semiconductor field-effect transistor (MOSFET), or a bipolar junction transistor (BJT), etc., and this invention does not impose any particular limitation on it. To reduce costs, this invention uses an NPN transistor as an example for illustrative purposes.

[0052] When the first switching transistor 231 includes a first NPN transistor T6, the second switching transistor 232 includes a second NPN transistor T3, the first light-emitting unit 241 includes a first light-emitting diode LED5, and the second light-emitting unit 242 includes a second light-emitting diode LED2: the output terminal of the control module of the T80 intelligent single beam measuring and control instrument is connected to the base of the first NPN transistor T6 and the base of the second NPN transistor T3 respectively; the collectors of the first NPN transistor T6 and the second NPN transistor T3 are both connected to the 24V power supply provided by the step-down chip unit 3; the emitter of the first NPN transistor T6 is connected to the anode of the first light-emitting diode LED5, and the cathode of the first light-emitting diode LED5 is grounded to GND; the emitter of the second NPN transistor T3 is connected to the anode of the second light-emitting diode LED2, and the cathode of the second light-emitting diode LED2 is grounded to GND.

[0053] The second LED (LED2) and the first LED (LED5) emit different colors to distinguish different levels of irritation. The following explanation uses an example where the second LED (LED2) emits green light and the first LED (LED5) emits red light.

[0054] To prevent excessive current from damaging the LEDs, as an optional implementation, a first current-limiting resistor R5 is connected in series on the line connecting the emitter of the first NPN transistor T6 and the anode of the first LED5, and a second current-limiting resistor R12 is connected in series on the line connecting the emitter of the second NPN transistor T3 and the anode of the second LED2.

[0055] The present invention does not impose any particular limitation on the resistance values ​​of the first current-limiting resistor R5 and the second current-limiting resistor R12, and they can be selected according to the actual situation. The embodiment of the present invention is based on the example of 1 kΩ for both resistors.

[0056] The first transmitter converts the acquired high liquid level signal into a first electrical signal, and the second transmitter converts the acquired low liquid level signal into a second electrical signal. The control module of the T80 intelligent single-beam beam meter is used to control the first NPN transistor T6 to conduct when the first electrical signal is greater than the preset first liquid level threshold, and to control the second NPN transistor T3 to conduct when the second electrical signal is greater than the preset second liquid level threshold. The first light-emitting diode LED5 emits red light when the first NPN transistor T6 is conducting, and the second light-emitting diode LED2 emits green light when the second NPN transistor T3 is conducting.

[0057] The first liquid level threshold is less than the second liquid level threshold.

[0058] To protect the booster pump and extend its service life, as an optional implementation, the control unit 1 also includes a relay control circuit for the booster pump. This circuit can be implemented by connecting the upper limit normally open contact of the T80 intelligent single-beam beam measuring and control instrument in the control unit 1 in series with the coil in the relay control circuit of the booster pump, or by connecting the upper limit normally open contact of the T80 intelligent single-beam beam measuring and control instrument in the control unit 1 in series with the coil in the relay control circuit of the booster pump. This invention does not impose any particular limitation on this; the following example uses the connection of the upper limit normally open contact of the T80 intelligent single-beam beam measuring and control instrument in the control unit 1 in series with the coil in the relay control circuit of the booster pump as an illustrative example. The normally closed contact in the relay control circuit of the booster pump is connected in series in the start / stop control circuit of the booster pump. When the first signal is greater than the first page threshold, the normally open upper limit contact of the T80 intelligent single beam meter and controller closes, the coil in the relay control circuit of the booster pump is energized, the control module controls the normally open contact in the relay control circuit of the booster pump to open, the normally closed contact in the relay control circuit of the booster pump to open, the relay of the booster pump is activated, and the booster pump is cut off.

[0059] It should be noted that when the normally open upper limit contact of the T80 intelligent single beam level controller in control unit 1 is connected in series with the coil in the relay control circuit of the booster pump, the high limit probe signal line of the liquid level sensing controller 22 is connected to the upper limit of the T80 intelligent single beam level controller; when the normally open upper limit contact of the T80 intelligent single beam level controller in control unit 1 is connected in series with the coil in the relay control circuit of the booster pump, the high limit probe signal line of the liquid level sensing controller 22 is connected to the upper limit of the T80 intelligent single beam level controller.

[0060] To protect the booster pump, as an optional implementation, the early warning control circuit also includes an external power supply protection circuit 2. The input terminal of the external power supply protection circuit 2 is connected to an external power supply, and the output terminal is connected to the power supply terminal of the T80 intelligent single beam meter and controller in the control unit 1 and the power supply terminal of each switch in the switching unit 5, respectively.

[0061] The external power supply consists of 35 kV high-voltage electricity transmitted from the high-voltage line, which is stepped down to 400 V by the station transformer to provide power and 220 V lighting electricity. The external power supply can be distributed to each electrical device through the outdoor power distribution device.

[0062] To prevent damage to the control unit 1 and the switching unit 5 due to excessive voltage, as an optional implementation, the warning control circuit also includes a step-down chip unit 3. With the step-down chip unit 3 present, the external power supply protection circuit 2 is connected to the power supply terminals of the T80 intelligent single-beam beam measuring and control instrument and each switching transistor in the switching unit 5 via the step-down chip unit 3.

[0063] The specific structure of the external power supply protection circuit 2 can be found in the following reference. Figure 3 .

[0064] Figure 3 This is a schematic diagram of an external power supply protection circuit provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the external power supply protection circuit includes: a control circuit for the first transformer TC1, a start / stop control circuit for the injection pump connected in parallel with the control circuit for the first transformer TC1, and a control circuit for the cooling fan connected in parallel with the control circuit for the first transformer TC1.

[0065] The function of the control circuit of the first transformer TC1 is to supply power to the second transformer TCA and to provide overvoltage protection for the injection pump. The control circuit of the first transformer TC1 includes: the first transformer TC1, the second transformer TC2, the switching terminal X, the coil of the first intermediate relay KA1, the normally closed contact of the first intermediate relay KA1, the coil of the second intermediate relay KA2, and the normally open contact of the second intermediate relay KA2.

[0066] Specifically, one end of the primary side of the first transformer TC1 is connected to the live wire L, and the other end is connected to the neutral wire N; the first end P1 of the secondary side of the first transformer TC1 is connected to the first inlet of the switching terminal X, and the second end P2 of the secondary side of the first transformer TC1 is connected to the second inlet of the switching terminal X through the coil of the first intermediate relay KA1 and to the first inlet of the switching terminal X through the coil of the second intermediate relay KA2; one end of the normally open contact of the second intermediate relay KA2 is connected to the live wire L connected to one end of the primary side of the first transformer TC1, and the other end is connected to one end of the primary side of the second transformer TC2 after being connected in series with the normally closed contact of the first intermediate relay KA1; the other end of the primary side of the second transformer TC2 is connected to the neutral wire N connected to the other end of the primary side of the first transformer TC1 after being connected through another set of normally closed contacts of the first intermediate relay KA1.

[0067] When power is needed for the second transformer TC2, the working principle of the control circuit of the first transformer TC1 is as follows: when the small circuit breaker in the control circuit of the injection pump control cabinet is closed, the primary side of the first transformer TC1 receives 220V voltage, and its secondary side outputs 36V voltage. After the coil of the second intermediate relay KA2 receives 36V voltage, the normally open contact of the second intermediate relay KA2 closes, and the circuit that controls the power supply to the second transformer TC2 is turned on, so the primary side of the second transformer TC2 receives 220V voltage.

[0068] When the injection pump is overvoltage protected, the working principle of the control circuit of the first transformer TC1 is as follows: the secondary side of the first transformer TC1 outputs 36V voltage. When the injection pump pressure exceeds the set value, XP1 (not shown) is turned on, the coil of the first intermediate relay KA1 receives 36V voltage and is energized. Its normally closed contact is opened, controlling the second transformer TC2 to lose power, and the injection pump stops working.

[0069] The injection pump start / stop control circuit includes: injection pump start button ST, injection pump stop button STP, normally open contact of the third intermediate relay KA3, and coil of the third intermediate relay KA3.

[0070] Specifically, one end of the injection pump stop button STP is connected to the end of the normally open contact of the second intermediate relay KA2 that is connected to the normally open contact of the first relay KA1. The other end of the injection pump stop button STP is connected to one end of the injection pump start button ST. The other end of the injection pump start button ST is connected in series with the coil of the third intermediate relay KA3 and then connected to the neutral line N connected to the other end of the primary side of the first transformer TC1. The first set of normally open contacts of the third intermediate relay KA3 is connected in parallel across the two ends of the injection pump start button ST, and the second set of normally open contacts is connected in series with the main control board circuit.

[0071] The working principle of the injection pump when it starts is as follows: After the live wire L and the neutral wire N are connected to the 220V power supply, the secondary side of the first transformer TC1 outputs 36V voltage. The switching terminal X controls the coil of the second intermediate relay KA2 to receive 36V voltage and then energizes it, controlling the coil of the first intermediate relay KA1 to be de-energized. Therefore, the normally open contact of the second intermediate relay KA2 is closed, and the normally closed contact of the first intermediate relay KA1 is closed. Because the liquid level has not reached the upper limit of the T80 level gauge (i.e., the high limit probe 224 of the level sensing and control instrument 22 has not yet collected data), the protection of the booster pump relay KA5 does not activate, so the normally closed contact of the booster pump relay KA5 is also closed. At this time, pressing the booster pump stop button STP closes the booster pump stop button STP, and the 220V voltage supplies power to the primary side of the second transformer TC2. The secondary side of the second transformer TC2 generates two 15V voltages for use by the main control board. Pressing the booster pump start button ST closes the booster pump start button ST, the coil of the third intermediate relay KA3 is energized and the normally open contact of the third intermediate relay KA3 closes, and the main control board sends a start signal to the booster pump, and the booster pump starts working.

[0072] The working principle when the booster pump stops is as follows: Pressing the booster pump stop button STP disconnects the button, causing the coil of the third intermediate relay KA3 to de-energize and open. The normally open contact of the third intermediate relay KA3 then opens, disconnecting the main control board's start signal, and the booster pump stops working. The working principle when the pump is stopped due to protection is as follows: When the liquid level reaches the upper limit, the normally open contact of the upper limit of the T80 intelligent single-beam level controller closes, providing 24V voltage to the coil of relay KA5. Relay KA5 engages, its normally closed contact opens, the primary side of TC2 loses 220V power supply, the main control board loses power and stops working, and the booster pump stops working.

[0073] The cooling fan control circuit includes: thermal relay YH, miniature relay KA4, first cooling fan 01, second cooling fan 02, and third cooling fan 03.

[0074] Specifically, one end of the normally open contact of the thermal relay YH is connected to the secondary side of the first transformer TC1 and one end of the normally open contact of the miniature relay KA4, respectively. The other end of the normally open contact of the thermal relay YH is connected in series with the coil of the miniature relay KA4. The other end of the coil of the miniature relay KA4 is connected to the secondary side of the first transformer TC1 and the second end of the first cooling fan 01, respectively.

[0075] The other end of the normally open contact of the miniature relay KA4 is connected to the first end of the first cooling fan 01, the second cooling fan 02 is connected in parallel to the two ends of the first cooling fan 01, and the third cooling fan 03 is connected in parallel to the two ends of the second cooling fan 02.

[0076] The working principle of the cooling fan control circuit is as follows: when the temperature inside the injection pump control cabinet reaches the set value, the normally open contact of the thermal relay YH closes, the coil of the intermediate relay KA4 receives 220V voltage and is energized, and the normally open contact of the coil of the intermediate relay KA4 also closes, connecting the first cooling fan 01, the second cooling fan 02 and the third cooling fan 03 to work, so as to cool down the injection pump control cabinet.

[0077] The step-down chip unit 3 can be any commercially available chip that can convert 100V~240V alternating current (AC) into 24V direct current (DC). This invention does not impose any particular limitation on it.

[0078] Figure 4 This is a schematic diagram of a step-down chip unit provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the buck converter chip unit is model TPS5430. Figure 4 In this circuit, the two AC input terminals a and b of the TPS5430 are connected to the output terminals of the external power protection module 3. The external power protection module 3 outputs 100V~240V AC power, which is converted into 24V DC power after passing through the full-bridge rectifier 40 and its peripheral circuits, the transformer 41 and its peripheral circuits, and the optocoupler 42 and its peripheral circuits. One DC power output port is c, and the other is d. The DC power output ports supply power to the T80 intelligent single-beam beam measuring and controlling instrument in the control unit 1, the various switching transistors in the switching unit 5, and the information cabinet 4, respectively.

[0079] To facilitate maintenance personnel's understanding of indicators such as the leakage rate of the injection pump and packing leaks, as an optional implementation, the early warning control circuit also includes an information cabinet 4. The external power protection circuit 2 is also connected to the information cabinet 4 through the step-down chip unit 3, and each probe of the liquid level sensing and control instrument 22 is connected to the information cabinet through quick connectors 221.

[0080] When powered by the step-down chip unit 3, the information cabinet 4 processes the liquid level signals sensed by each probe of the liquid level sensing and control instrument 22, converts them into a 4-20 milliampere (mA) current signal, and transmits it to the analog (AI) interface of the remote terminal unit (RTU) via the signal line. The RTU processes and stores the data it reads and then transmits it to the supervisory control and data acquisition (SCADA) system via the network.

[0081] The following is a detailed explanation. Figure 1 The working principle of the injection pump packing leak warning device is shown.

[0082] Specifically, when packing leakage occurs, the groundwater in the packing first passes through filter plate 224 to filter impurities, which are then filtered into the sedimentation tank. The filtered groundwater then enters the inlet chamber. When the leakage amount during packing leakage is less than the preset opening of the flow metering valve 212, the liquid level in the tank 21 remains unchanged. When the leakage amount during packing leakage exceeds the preset opening of the flow metering valve 212, the liquid level in the tank 21 begins to rise. When the liquid level reaches the low limit probe 223 of the liquid level sensing and control instrument 22, the low limit sensing probe 223 transmits the sensed liquid level signal to the second transmitter. The second transmitter converts this liquid level signal into a second electrical signal. When the second electrical signal is greater than the second preset threshold, the control module in the T80 intelligent single-beam beam controller controls the second NPN transistor T3 to conduct, and the second light-emitting diode LED2 emits green light. As the leakage from the packing gland increases, the liquid level in the housing 21 rises to the high limit probe 224 of the liquid level sensor and controller 22. The high limit probe 224 then transmits the sensed liquid level signal to the first transmitter. The first transmitter converts this liquid level signal into a first electrical signal. When the first electrical signal exceeds the first preset threshold, the control module in the T80 intelligent single beam meter and controller controls the first NPN transistor T6 to conduct, and the first light-emitting diode LED5 emits red light. The control module in the T80 intelligent single beam meter and controller also controls the venting solenoid valve 211 to open, discharging the liquid in the housing 21. At the same time, the relay of the booster pump is disconnected, and the booster pump stops working, thus preventing water from entering the crankcase of the booster pump and causing an oil emulsification and scrapping accident.

[0083] This invention provides a packing leak early warning device for a booster pump, comprising an early warning control circuit, a housing for collecting leaking liquid from the booster pump packing, and a liquid level sensor installed inside the housing to sense the liquid level within the housing. A baffle plate is provided below the water inlet of the housing, dividing the housing into an inlet chamber communicating with the water inlet and a sensing chamber for housing the liquid level sensor. A channel is provided on one end of the baffle plate near the bottom wall of the housing to connect the inlet chamber and the sensing chamber. By installing a baffle plate inside the housing, dividing the housing into two chambers—one for water inlet and the other for housing the liquid level sensor—the baffle plate prevents water leaking from the packing from splashing onto the sensing probe of the liquid level sensor, reducing false alarms. The channel below the baffle plate allows liquid from the inlet chamber to flow into the sensing chamber, improving the accuracy of liquid level measurement by the liquid level sensor in the sensing chamber.

Claims

1. A pre-existing warning device for packing puncture of a booster pump, comprising a pre-existing warning control circuit and a housing for collecting liquid leaking from the packing of the booster pump, wherein a liquid level sensor is installed inside the housing for sensing the liquid level inside the housing, characterized in that, A baffle plate is provided below the water inlet of the box body, which divides the box body into a liquid inlet chamber that communicates with the water inlet and a sensing chamber for placing the liquid level sensing and control instrument. The baffle plate near the bottom wall of the box has a channel for connecting the liquid inlet chamber and the sensing chamber.

2. The injection pump packing leak early warning device according to claim 1, characterized in that, The box includes an open box and an upper cover adapted to the open box; The upper cover is hinged or overlapped with the open box body.

3. The injection pump packing leak early warning device according to claim 2, characterized in that, The water inlet is located on the top wall of the upper end cover.

4. The injection pump packing leak early warning device according to claim 3, characterized in that, A first short plate is provided on the side wall of the upper end cover; The first short plate is connected to or hinged to the side wall of the upper end cover through a supporting structure; The upper cover also includes an inclined filter plate, one end of which overlaps or is hinged to the other end of the first short plate, and the other end of which overlaps or is hinged to the liquid baffle. The first short plate, the filter plate, and the upper cover form a sedimentation tank at their joint.

5. The injection pump packing leak early warning device according to claim 1, characterized in that, The base of the liquid level sensing and control instrument is fixedly connected to the bottom wall of the box.

6. The injection pump packing leak early warning device according to claim 5, characterized in that, The probe of the liquid level sensing and control instrument includes at least a high limit probe.

7. The injection pump packing leak early warning device according to claim 6, characterized in that, The liquid level sensing and control instrument also includes a quick connector; The quick connector is located on the outside of the housing; The signal line of the high limit probe is connected to the early warning control circuit via the quick connector.

8. The injection pump packing leak early warning device according to claim 7, characterized in that, The early warning control circuit includes: a signal conversion unit, a control unit, a switching unit, and an alarm unit; The control unit includes: an intelligent single-beam beam measuring and control instrument; The signal line of the high-limit probe is connected to the control module of the intelligent single-beam beam measuring and control instrument through the signal conversion unit. The control module is connected to the control terminal of the switch unit; The on / off terminal of the switch unit is connected in series with the alarm unit.

9. The injection pump packing leak early warning device according to claim 8, characterized in that, The control unit also includes a relay control circuit for the booster pump; The normally open upper limit contact of the intelligent single beam measuring and control instrument is connected in series with the coil in the relay control circuit of the booster pump; the normally closed contact in the relay control circuit of the booster pump is connected in series with the start / stop control circuit of the booster pump.

10. The injection pump packing leak early warning device according to claim 8 or 9, characterized in that, It also includes a flow metering valve disposed on the bottom wall of the housing and communicating with the liquid inlet chamber, and a venting solenoid valve disposed at the bottom of the side wall of the housing and communicating with the liquid inlet chamber or the sensing chamber. The control terminal of the venting solenoid valve is connected to the control module of the intelligent single beam measuring and control instrument.

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