A pre-filtered liquid pump device

Abstract

This utility model discloses a pre-filter liquid pump device applied to a water purification system. The water purification system includes a pre-filter and a water purifier. The output end of the pre-filter is connected to the input end of the water purifier. The pre-filter liquid pump device includes a pump assembly and a flow detection assembly. The input end of the pump assembly is used to connect to the water supply source, and the output end of the pump assembly is used to connect to the input end of the pre-filter. The flow detection assembly is installed between the output end of the pre-filter and the input end of the water purifier. The flow detection assembly is used to detect liquid flow and generate a trigger signal. The pump assembly is connected to the flow detection assembly to start operation according to the trigger signal. This design starts to increase water pressure as needed to meet the user's water purification needs.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, and in particular to a pre-filter liquid pump device. Background Technology

[0002] Existing water purifiers are typically RO (reverse osmosis) water purifiers, which contain an RO membrane. The RO membrane uses the reverse osmosis principle to filter out impurities such as metals and minerals from the water, thus purifying it. However, RO membranes are relatively expensive. When the water supply contains a large number of large particles, these particles adhere to the RO membrane, significantly reducing its lifespan. Therefore, manufacturers recommend that users install a pre-filter between the water supply and the purifier's input. Pre-filters contain filter cartridges made of materials such as activated carbon, diatomaceous earth, resin, and titanium rods. These cartridges have a microporous structure that effectively isolates larger particles, achieving coarse filtration. Furthermore, pre-filter cartridges are less expensive than RO membranes, making them more suitable for frequent replacement.

[0003] However, when the above structure is applied in remote areas where the water quality is poor and the water pressure is insufficient, the water flow cannot be supplied to the user normally after particulate matter clogs the micropores of the filter element. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pre-filter liquid pump device that can be activated as needed to increase water pressure and meet the user's purified water needs.

[0005] A pre-filter liquid pump device according to a first aspect of the present invention is applied to a water purification system. The water purification system includes a pre-filter and a water purifier. The output end of the pre-filter is connected to the input end of the water purifier. The pre-filter liquid pump device includes: a liquid pump assembly, the input end of which is connected to a water supply source, and the output end of which is connected to the input end of the pre-filter; and a liquid flow detection assembly, installed between the output end of the pre-filter and the input end of the water purifier, the liquid flow detection assembly being used to detect liquid flow and generate a trigger signal. The liquid pump assembly is connected to the liquid flow detection assembly to start operation according to the trigger signal.

[0006] A pre-filter pump device according to an embodiment of the present utility model has at least the following beneficial effects:

[0007] This utility model relates to a pre-filter liquid pump device. A liquid pump assembly is installed between the pre-filter and the water supply source, and a liquid flow detection assembly is installed between the output end of the pre-filter and the input end of the water purifier. When the water purifier prepares soft water or the user opens the water valve, causing water flow between the water supply source and the water purifier, the liquid flow detection assembly detects the liquid flow and generates a trigger signal. The liquid pump assembly starts operating according to the trigger signal, increasing the water pressure. Even in cases of poor water quality, the increased water pressure ensures that water can still be supplied to the input end of the water purifier through the pre-filter. When the water purifier stops operating or the user stops using water, the liquid flow detection assembly detects the cessation of liquid flow and controls the liquid pump assembly to stop operating, saving energy. This design increases water pressure on demand to meet the user's purified water needs.

[0008] According to some embodiments of the present invention, the liquid flow detection component includes a base shell, a movable component, a light emitter, and a light receiver. The base shell has a movable cavity and an inlet and an outlet, both communicating with the movable cavity. The inlet is connected to the output end of a pre-filter, and the outlet is connected to the input end of a water purifier. The movable component is movably disposed within the movable cavity and located between the inlet and the outlet. The light emitter and the light receiver are disposed on the inner wall of the movable cavity and face each other. The movable component has at least a first movable position and a second movable position within the movable cavity. When liquid flows from the inlet to the outlet, the movable component can move from the first movable position to the second movable position. In the first movable position, the light emitted by the light emitter can be received by the light receiver. In the second movable position, the movable component is located between the light emitter and the light receiver, blocking the light emitted by the light emitter from being received by the light receiver, thereby causing the light receiver to generate a trigger signal.

[0009] According to some embodiments of the present invention, the movable component is provided with a counterweight, which can drive the movable component to move to a first movable position.

[0010] According to some embodiments of the present invention, the base shell is provided with an elastic element in the movable cavity, and the elastic element can abut against the movable element to drive the movable element to move to a first movable position.

[0011] According to some embodiments of the present invention, the base shell is provided with a limiting partition near the liquid outlet in the movable cavity. The limiting partition can restrict the movable part from passing through the liquid outlet, and the limiting partition is provided with multiple through holes.

[0012] According to some embodiments of the present invention, the pre-filter pump device further includes a switch module, which forms at least a portion of the power supply branch with the pump assembly. The power supply branch is used to connect to a power supply. The output terminal of the optical receiver is connected to the controlled terminal of the switch module to control the switch module to conduct according to a trigger signal.

[0013] According to some embodiments of this utility model, the switching module includes a relay unit and a diode D1, the light receiver includes a photosensitive switch, which conducts when receiving light, the relay unit includes a relay coil and a relay switch, the relay coil being energized to engage the relay switch, the first end of the light receiver is connected to the negative terminal of diode D1, the first end of the relay coil, and the first end of the relay switch and connected to a power supply, the last end of the light receiver is connected to the positive terminal of diode D1 and the last end of the relay coil and grounded, and the last end of the relay switch is connected to the liquid pump assembly.

[0014] According to some embodiments of the present invention, the pre-filter pump device further includes a control module and a switch module. The switch module and the pump assembly form at least a portion of the power supply branch, which is used to connect to a power supply. The control module is connected to the controlled end of the liquid flow detection assembly and the switch module respectively to control the switch module to conduct according to a trigger signal.

[0015] According to some embodiments of the present invention, the control module includes a signal processing unit, the input terminal of which is connected to the optical receiver, and the output terminal of which is connected to the controlled terminal of the switch module.

[0016] According to some embodiments of this utility model, the light receiver includes a photosensitive switch, which is turned on when receiving light. The signal processing unit includes resistors R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16, operational amplifier U1, operational amplifier U2, and diode D2. The switching module includes a switching transistor Q1. The first terminal of the photosensitive switch is connected to the first terminals of resistors R4, R6, R10, and R12, as well as the negative terminal of diode D2, and is connected to a power supply. The first terminal of resistor R3 is connected to the second terminal of the photosensitive switch and the first terminal of resistor R2. The second terminal of resistor R3 is connected to the second terminal of resistor R4, the first terminal of resistor R5, and the second input terminal of operational amplifier U1. The first input terminal of operational amplifier U1 is... Do not connect the following resistors to the tail end of resistor R6, the beginning end of resistor R8, and the beginning end of resistor R7. Connect the output of operational amplifier U1 to the tail end of resistor R8 and the beginning end of resistor R9. Connect the tail end of resistor R9 to the tail end of resistor R10, the beginning end of resistor R11, and the first input terminal of operational amplifier U2. Connect the second input terminal of operational amplifier U2 to the tail end of resistor R12 and the beginning end of resistor R13. Connect the output of operational amplifier U2 to the beginning end of resistor R14. Connect the tail end of resistor R14 to the beginning end of resistor R15 and the controlled terminal of switch Q1. Connect the input terminal of switch Q1 to the positive terminal of diode D2 and the liquid pump assembly. Connect the output of switch Q1 to the tail end of resistor R13 and the beginning end of resistor R16. Connect the tail end of resistor R2 to the tail ends of resistors R5, R7, R11, R15, and R16 and ground.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the principle structure of one embodiment of the pre-filter pump device of this utility model;

[0020] Figure 2 This is a cross-sectional view of the fluid flow detection component;

[0021] Figure 3This is a circuit diagram of the switching module of the first embodiment of the pre-filter pump device of this utility model;

[0022] Figure 4 This is a circuit diagram of the signal processing unit of the pre-filter pump device of the present invention, according to a second embodiment.

[0023] Figure label:

[0024] Pre-filter 100; Water purifier 200; Liquid pump assembly 300; Liquid flow detection assembly 400; Base shell 410; Movable cavity 420; Liquid inlet 430; Liquid outlet 440; Limiting partition 450; Through hole 451; Movable component 460; Light emitting component 470; Light receiving component 480; Relay unit 500; Relay coil 510; Relay switch 520; Signal processing unit 600; Switch module 700. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1 to 4 As shown, a pre-filter liquid pump device according to a first aspect embodiment of the present invention is applied to a water purification system. The water purification system includes a pre-filter 100 and a water purifier 200. The output end of the pre-filter 100 is connected to the input end of the water purifier 200. The pre-filter liquid pump device includes a pump assembly 300 and a flow detection assembly 400. The input end of the pump assembly 300 is used to connect to a water supply source, and the output end of the pump assembly 300 is used to connect to the input end of the pre-filter 100. The flow detection assembly 400 is installed between the output end of the pre-filter 100 and the input end of the water purifier 200. The flow detection assembly 400 is used to detect liquid flow to generate a trigger signal. The pump assembly 300 is connected to the flow detection assembly 400 to start operation according to the trigger signal.

[0030] The water purifier 200 is typically an RO reverse osmosis water purifier 200, equipped with an RO reverse osmosis membrane. The RO reverse osmosis membrane uses the principle of reverse osmosis to filter out impurities such as metal and mineral particles from the water, achieving water purification. The pre-filter 100 contains a filter element made of materials such as activated carbon, diatomaceous earth, resin, and titanium rods. The filter element has a microporous structure, which can first isolate larger particles, achieving coarse filtration. The liquid pump assembly 300 can be selected from conventional fluid pumps. The liquid pump assembly 300 may have a rotor; the rotation of the rotor provides pressure to drive the water flow towards the input end of the pre-filter 100.

[0031] This utility model relates to a pre-filter liquid pump device. A liquid pump assembly 300 is installed between the pre-filter 100 and the water supply source, and a liquid flow detection assembly 400 is installed between the output end of the pre-filter 100 and the input end of the water purifier 200. When the water purifier 200 prepares soft water or the user opens the water valve to use water, causing water flow between the water supply source and the water purifier 200, the liquid flow detection assembly 400 detects the liquid flow and generates a trigger signal. The liquid pump assembly 300 starts operating according to the trigger signal, increasing the water pressure for the water supply. Even in cases of poor water quality, the increased water pressure ensures that water can still be supplied to the input end of the water purifier 200 through the pre-filter 100. When the water purifier 200 stops operating or the user stops using water, the liquid flow detection assembly 400 detects the cessation of liquid flow and controls the liquid pump assembly 300 to stop operating, saving energy. This design increases water pressure on demand to meet the user's purified water needs.

[0032] In some embodiments of this utility model, such as Figure 2 As shown, the liquid flow detection component 400 includes a base shell 410, a movable component 460, a light emitter 470, and a light receiver 480. The base shell 410 has a movable cavity 420. The base shell 410 has an inlet 430 and an outlet 440, both communicating with the movable cavity 420. The inlet 430 is connected to the output end of the pre-filter 100, and the outlet 440 is connected to the input end of the water purifier 200. The movable component 460 is movably disposed within the movable cavity 420 and located between the inlet 430 and the outlet 440. The light emitter 470 and the light receiver 480 are disposed on the inner wall of the movable cavity 420, and the light... The emitter 470 and the light receiver 480 are directly opposite each other. The movable member 460 has at least a first movable position and a second movable position in the movable cavity 420. When the liquid flows from the inlet 430 to the outlet 440, the movable member 460 can move from the first movable position to the second movable position. When the movable member 460 is in the first movable position, the light emitted by the light emitter 470 can be received by the light receiver 480. When the movable member 460 is in the second movable position, the movable member 460 is located between the light emitter 470 and the light receiver 480, thus blocking the light emitted by the light emitter 470 from being received by the light receiver 480, so that the light receiver 480 generates a trigger signal.

[0033] The base shell 410 can be a pipe made of resin or alloy material. The inlet 430 and outlet 440 are located at opposite ends of the movable cavity 420. The light emitter 470 can be a conventional laser emitter, infrared emitter, etc., and the light receiver 480 is a laser receiver, infrared receiver, etc., adapted to the light emitter 470. The movable part 460 can be spherical or cylindrical. When water flows, the water flow exerts force on the surface of the movable part 460, which can push the movable part 460 from the inlet 430 toward the outlet 440 to the second movable position. At this time, the movable part 460 can be located between the light emitter 470 and the light receiver 480, blocking the light emitted by the light emitter 470 from being received by the light receiver 480. When the water flow stops, the movable part 460 can return to the first movable position, and the light output by the light emitter 470 can be received by the light receiver 480. In this way, it can be determined whether there is water flow.

[0034] In some embodiments of this utility model, the movable component 460 is provided with a counterweight. The counterweight can drive the movable component 460 to move to a first movable position. The counterweight can be integrally formed with the movable component 460, or it can be an alloy component disposed inside the movable component 460. The liquid inlet 430 is located below the movable cavity 420, while the liquid outlet 440 is located above the movable cavity 420. When there is no water flow, under the action of gravity, the gravity is greater than the buoyancy of the movable component 460, and the movable component 460 will move down to be close to the liquid inlet 430. In the first active position, when the water flows, the combined force of the pressure exerted by the water flow on the movable part 460 and the buoyancy is greater than the gravity, so the movable part 460 moves upward to the second active position near the outlet 440. Alternatively, the inlet 430 is also located above the active cavity 420, where the gravity of the movable part is less than the buoyancy. When the water flow is still, the buoyancy pushes the movable part to the first active position. When the water flow is flowing, the combined force of the pressure exerted by the water flow on the movable part 460 and the gravity is greater than the buoyancy, so the movable part 460 moves upward to the second active position near the outlet 440.

[0035] In some embodiments of this utility model, the base shell 410 is provided with an elastic element in the movable cavity 420, and the elastic element can abut against the movable element 460 to drive the movable element 460 to move to a first movable position.

[0036] The elastic element can be a spring, a rubber column, etc. When there is no water flow, the elastic element applies force to the movable element 460, causing the movable element 460 to tend to move to the first movable position. When the water flows, the force exerted by the water flow on the movable element 460 is greater than the force exerted by the elastic element, so the movable element 460 moves to the second movable position.

[0037] In some embodiments of this utility model, such as Figure 2As shown, the base shell 410 has a limiting partition 450 in the movable cavity 420 near the liquid outlet 440. The limiting partition 450 can restrict the movable part 460 from passing through the liquid outlet 440. The limiting partition 450 is provided with a plurality of through holes 451.

[0038] The limiting baffle 450 can be integrally set with the base shell 410 or a plate added inside the base shell 410. Liquid can pass through the through hole 451, but the limiting baffle 450 can block the moving part 460, thereby preventing the moving part 460 from coming out of the liquid outlet 440 under the push of the water flow.

[0039] In some embodiments of this utility model, the pre-filter pump device further includes a switch module, which forms at least part of the power supply branch with the pump assembly 300. The power supply branch is used to connect to the power supply. The output terminal of the photodetector 480 is connected to the controlled terminal of the switch module to control the switch module to conduct according to the trigger signal.

[0040] The switching module is controlled by whether the optical receiver 480 outputs a trigger signal, which in turn controls the power supply branch. The liquid pump assembly 300 operates when powered on and stops when powered off. The structure is simple and efficient, and the layout cost is low.

[0041] Specifically, such as Figure 3 As shown, the switching module includes a relay unit 500 and a diode D1. The light receiver 480 includes a photosensitive switch that conducts when receiving light. The relay unit 500 includes a relay coil 510 and a relay switch 520. The relay coil 510 is energized and can attract the relay switch 520. The first end of the light receiver 480 is connected to the negative terminal of the diode D1, the first end of the relay coil 510, and the first end of the relay switch 520, and is connected to a power supply. The tail end of the light receiver 480 is connected to the positive terminal of the diode D1 and the tail end of the relay coil 510, and is grounded. The tail end of the relay switch 520 is connected to the liquid pump assembly 300.

[0042] The power supply connected to the first terminal of relay switch 520 and the power supply connected to the negative terminal of diode D1 can be the same or different. For example, they can both be 12V DC power supply and 24V DC power supply, or the power supply connected to the negative terminal of diode D1 can be 12V DC power supply, while the power supply connected to the first terminal of relay switch 520 can be 220V power supply.

[0043] In some embodiments of this utility model, the pre-filter pump device further includes a control module and a switch module 700. The switch module 700 and the pump assembly 300 form at least a portion of the power supply branch, which is used to connect to the power supply. The control module is connected to the controlled terminals of the liquid flow detection assembly 400 and the switch module 700 respectively to control the switch module to conduct according to the trigger signal.

[0044] The control module can make logical judgments based on the trigger signal to generate corresponding control signals to control the on / off state of the switch module. Similarly, it can control the on / off state of the power supply branch. The liquid pump assembly 300 operates when powered on and stops when powered off. The logic control is flexible and suitable for expanding more functions.

[0045] In some embodiments of this utility model, such as Figure 4 As shown, the control module includes a signal processing unit 600, the input terminal of which is connected to the optical receiver 480, and the output terminal of which is connected to the controlled terminal of the switch module 700.

[0046] The signal processing unit 600 can perform digital-to-analog conversion and amplification on the analog signal output by the optical receiver 480.

[0047] Specifically, the light receiver 480 includes a photosensitive switch that conducts when receiving light. The signal processing unit 600 includes resistors R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16, operational amplifier U1, operational amplifier U2, and diode D2. The switch module 700 includes a switching transistor Q1. The first terminal of the photosensitive switch is connected to the first terminals of resistors R4, R6, R10, and R12, as well as the negative terminal of diode D2, and is connected to a power supply. The first terminal of resistor R3 is connected to the second terminal of the photosensitive switch and the first terminal of resistor R2. The second terminal of resistor R3 is connected to the second terminal of resistor R4, the first terminal of resistor R5, and the second input terminal of operational amplifier U1. The first input terminal of operational amplifier U1 is connected to the first terminal of resistor R2. The terminals of resistors R6, R8, and R7 are connected. The output of operational amplifier U1 is connected to the terminals of resistors R8 and R9. The terminal of resistor R9 is connected to the terminals of resistors R10 and R11, and the first input terminal of operational amplifier U2. The second input terminal of operational amplifier U2 is connected to the terminals of resistors R12 and R13. The output of operational amplifier U2 is connected to the first terminal of resistor R14. The tail end of resistor R14 is connected to the beginning end of resistor R15 and the controlled end of switch Q1. The input end of switch Q1 is connected to the positive terminal of diode D2 and the controlled end of switch module 700. The output end of switch Q1 is connected to the tail end of resistor R13 and the beginning end of resistor R16. The tail end of resistor R2 is connected to the tail ends of resistors R5, R7, R11, R15, and R16 and grounded.

[0048] Resistors R3, R4, and R5 divide and sample the trigger signal, while resistors R6 and R7 divide the power supply output voltage to form a first reference signal. Operational amplifier U1 compares the trigger signal with the first reference signal and outputs a digital signal. Operational amplifier U2 amplifies and processes the digital signal output by operational amplifier U1, thereby driving the switching transistor Q1 to turn on and off to form a feedback signal to the control unit. Specifically, the switching transistor Q1 can be a transistor, a MOSFET, or an IGBT.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pre-filter liquid pump device applied to a water purification system, the water purification system comprising a pre-filter and a water purifier, an output end of the pre-filter being connected with an input end of the water purifier, characterized in that, The pre-filter pump unit includes: A liquid pump assembly, wherein the input end of the liquid pump assembly is used to connect to a water supply source, and the output end of the liquid pump assembly is used to connect to the input end of a pre-filter; A liquid flow detection component is installed between the output end of the pre-filter and the input end of the water purifier. The liquid flow detection component is used to detect liquid flow and generate a trigger signal. The liquid pump component is connected to the liquid flow detection component to start operation according to the trigger signal.

2. A pre-filtered fluid pump apparatus as claimed in claim 1, wherein: The liquid flow detection component includes a base shell, a movable component, a light emitter, and a light receiver. The base shell has a movable cavity and an inlet and an outlet, both communicating with the movable cavity. The inlet is connected to the output of a pre-filter, and the outlet is connected to the input of a water purifier. The movable component is movably disposed within the movable cavity and located between the inlet and the outlet. The light emitter and the light receiver are disposed on the inner wall of the movable cavity and face each other. The movable component has at least a first movable position and a second movable position within the movable cavity. When liquid flows from the inlet to the outlet, the movable component can move from the first movable position to the second movable position. In the first movable position, the light emitted by the light emitter can be received by the light receiver. In the second movable position, the movable component is located between the light emitter and the light receiver, blocking the light emitted by the light emitter from being received by the light receiver, thereby causing the light receiver to generate a trigger signal.

3. A pre-filter pump apparatus as claimed in claim 2, wherein: The movable component is provided with a counterweight, which can drive the movable component to move to a first movable position.

4. The pre-filtered fluid pump apparatus of claim 2, wherein: The base shell is provided with an elastic element in the movable cavity, and the elastic element can abut against the movable element to drive the movable element to move to a first movable position.

5. A pre-filtered fluid pump apparatus as defined in claim 2, wherein: The base shell has a limiting baffle plate in the movable cavity near the liquid outlet. The limiting baffle plate can restrict the movable part from passing through the liquid outlet. The limiting baffle plate is provided with multiple through holes.

6. A pre-filtered fluid pump apparatus as defined in claim 2, wherein, It also includes a switch module, which, together with the liquid pump assembly, forms at least a portion of the power supply branch, which is used to connect to a power supply. The output terminal of the optical receiver is connected to the controlled terminal of the switch module to control the switch module to conduct according to a trigger signal.

7. A pre-filtered fluid pump apparatus as claimed in claim 6, wherein, The switching module includes a relay unit and a diode D1. The light receiver includes a photosensitive switch, which conducts when receiving light. The relay unit includes a relay coil and a relay switch. The relay coil is energized to engage the relay switch. The first end of the light receiver is connected to the negative terminal of diode D1, the first end of the relay coil, and the first end of the relay switch, and is connected to a power supply. The last end of the light receiver is connected to the positive terminal of diode D1 and the last end of the relay coil, and is grounded. The last end of the relay switch is connected to the liquid pump assembly.

8. The pre-filtered fluid pump apparatus of claim 2, wherein, It also includes a control module and a switch module. The switch module and the liquid pump assembly form at least part of the power supply branch. The power supply branch is used to connect to the power supply. The control module is connected to the controlled end of the liquid flow detection assembly and the switch module respectively to control the switch module to conduct according to the trigger signal.

9. A pre-filtered fluid pump apparatus as defined in claim 8, wherein, The control module includes a signal processing unit, the input of which is connected to the optical receiver, and the output of which is connected to the controlled end of the switch module.

10. A pre-filtered fluid pump apparatus as claimed in claim 9, wherein, The light receiver includes a photosensitive switch that conducts when receiving light. The signal processing unit includes resistors R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16, operational amplifier U1, operational amplifier U2, and diode D2. The switching module includes a switching transistor Q1. The first terminal of the photosensitive switch is connected to the first terminals of resistors R4, R6, R10, and R12, as well as the negative terminal of diode D2, and is connected to a power supply. The first terminal of resistor R3 is connected to the second terminal of the photosensitive switch and the first terminal of resistor R2. The second terminal of resistor R3 is connected to the second terminal of resistor R4, the first terminal of resistor R5, and the second input terminal of operational amplifier U1. The first input terminal of operational amplifier U1 is connected to the first terminal of resistor R6. The tail end, the beginning end of resistor R8, and the beginning end of resistor R7 are connected. The output end of operational amplifier U1 is connected to the tail end of resistor R8 and the beginning end of resistor R9. The tail end of resistor R9 is connected to the tail end of resistor R10, the beginning end of resistor R11, and the first input end of operational amplifier U2. The second input end of operational amplifier U2 is connected to the tail end of resistor R12 and the beginning end of resistor R13. The output end of operational amplifier U2 is connected to the beginning end of resistor R14. The tail end of resistor R14 is connected to the beginning end of resistor R15 and the controlled end of switching transistor Q1. The input end of switching transistor Q1 is connected to the positive terminal of diode D2 and the liquid pump assembly. The output end of switching transistor Q1 is connected to the tail end of resistor R13 and the beginning end of resistor R16. The tail end of resistor R2 is connected to the tail ends of resistors R5, R7, R11, R15, and R16 and grounded.

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