Quantitative liquid conveyor

Abstract

The utility model belongs to the technical field of machinery, and particularly relates to a liquid quantitative conveyor which solves the problem that liquid cannot be quantitatively output. The quantitative liquid conveyor comprises a liquid storage tank and a pumping cylinder body, a piston is connected in the pumping cylinder body in a sliding mode, a liquid storage cavity is formed between the piston and the pumping cylinder body, a liquid inlet connector and a liquid outlet connector are connected to the liquid storage cavity, the liquid inlet connector is connected with the liquid storage tank, and the liquid outlet connector is connected with the pumping cylinder body. One-way valves are arranged on the liquid inlet connector and the liquid outlet connector, and the piston is driven by the piston driving structure to move so as to compress or expand the liquid storage cavity. The effect of quantitatively outputting liquid at a time is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery, and in particular relates to a liquid quantitative conveyor. Background Art

[0002] In mechanical equipment, in order to reduce the friction resistance and wear rate between multiple parts in frictional contact, it is often necessary to deliver lubricating oil or other liquid media to the corresponding positions. However, most current lubricating oil delivery devices use direct extrusion or spraying to output oil to the corresponding positions. This makes it impossible to accurately control the amount of oil output at a single time, which may cause problems such as inadequate lubrication or waste of lubricating oil, which is not conducive to the stable operation and cost control of the machinery. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems in the prior art and to provide a liquid quantitative conveyor.

[0004] In order to achieve the purpose of innovation of this utility model, the following technical solutions can be used:

[0005] A liquid quantitative conveyor includes a pumping cylinder, a piston is slidably connected to the pumping cylinder, a liquid storage chamber is formed between the piston and the pumping cylinder, a liquid inlet interface and a liquid outlet interface are connected to the liquid storage chamber, the liquid inlet interface is connected to a liquid storage tank, and a one-way valve is provided on the liquid inlet interface and the liquid outlet interface. The piston is driven by a piston drive structure to move to compress or expand the liquid storage chamber.

[0006] The liquid quantitative conveyor of the present invention can be used for quantitatively conveying liquids such as lubricating oil and water, wherein the liquid storage tank is used to store the liquid to be conveyed, and a cylindrical liquid storage chamber is provided in the pumping cylinder body, which is closed by a piston, and the piston driving structure is used to drive the axial movement of the piston to change the pressure inside the liquid storage chamber. An annular seal is formed between the piston and the inner wall of the liquid storage chamber, and a one-way valve is provided on the liquid inlet interface and the liquid outlet interface, so that the interface can only be used for the input or output of the liquid. When the piston is withdrawn and the pressure decreases, the liquid inlet interface draws the liquid in the liquid storage tank into the liquid storage chamber, and conversely, the liquid in the liquid storage chamber is pressed out from the liquid outlet interface. The single extrusion amount is the liquid storage amount in the liquid storage chamber, thereby achieving the effect of quantitative conveying.

[0007] In the above-mentioned liquid quantitative conveyor, the piston drive structure includes a drive chamber arranged between the piston and the pumping cylinder body, the drive chamber and the liquid storage chamber are respectively located on both sides of the piston, and the drive chamber is provided with an air inlet joint and an air outlet joint, and the air inlet joint and the air outlet joint are connected to the gas power assembly through an electromagnetic valve assembly.

[0008] A drive chamber and a liquid storage chamber are formed on either side of the piston, respectively. A gas power assembly is connected to the drive chamber, driving the piston's movement, acting as a cylinder. A solenoid valve assembly controls the passage between the gas power assembly and the drive chamber. The gas power assembly and solenoid valve assembly are common knowledge and will not be discussed in detail.

[0009] In the above-mentioned liquid quantitative conveyor, the pumping cylinder is provided with a flow rate regulating structure, and the flow rate regulating structure includes a speed regulating valve assembly arranged on the air inlet joint, and the speed regulating valve assembly is provided with a speed regulating knob.

[0010] The flow rate regulation structure is used to adjust the channel size of the air inlet connector, thereby controlling the speed of gas entry, controlling the rate of change of the driving chamber pressure, and achieving the effect of controlling the flow rate of the liquid output from the liquid storage chamber. It can be applied to application scenarios with different flow rate requirements.

[0011] In the above-mentioned liquid quantitative conveyor, the piston drive structure includes a drive motor, which is arranged on the pumping cylinder body, and the piston is connected to the output end of the drive motor through a screw transmission assembly or a gear rack assembly.

[0012] As another feasible solution for the piston driving structure, the driving motor drives the axial movement of the piston through a corresponding transmission structure, and the transmission structure can be implemented by, but not limited to, a screw transmission assembly or a rack and pinion assembly.

[0013] Specifically, the screw transmission assembly includes a screw that passes through the pumping cylinder and a nut that engages with the screw. The nut is fixedly connected to the piston, and the screw is connected to the output end of the drive motor. The output end of the drive motor is rotated to drive the screw, thereby achieving the effect of controlling the nut's axial movement on the screw, thereby achieving the axial movement control of the piston. The rack and pinion assembly includes a rack axially arranged on the upper end of the piston, and the rack is connected to the gear on the output end of the drive motor. The rack is fixed in the same direction to the upper end of the piston, and the gear on the output end of the drive motor is engaged with the rack. The output end of the drive motor is rotated to achieve the effect of driving the rack's axial movement, thereby controlling the extension and retraction of the piston.

[0014] In the above-mentioned liquid quantitative conveyor, a flow regulating structure is also provided between the side of the piston away from the liquid storage chamber and the pumping cylinder body. The flow regulating structure includes a fine-tuning micrometer arranged on the piston cylinder body. The telescopic axis of the fine-tuning micrometer is located on the movable path of the piston and is used to limit the maximum pulling distance of the piston.

[0015] The flow regulation structure controls the volume of the liquid storage chamber by limiting the maximum pull-out distance of the piston, thereby controlling the flow rate of a single liquid output. This is specifically achieved through a fine-tuning micrometer. The telescopic shaft of the fine-tuning micrometer is located on the movable path of the piston. When the piston is pulled out, it is offset against the telescopic shaft. At this time, the liquid storage chamber is fully filled with liquid at a single time. By adjusting the axial position of the telescopic shaft, the maximum pull-out distance of the piston can be adjusted, thereby achieving effective control of the single output liquid volume.

[0016] In the above-mentioned liquid quantitative conveyor, the fine-adjustment micrometer includes a mounting base fixed on the pumping cylinder body and a telescopic shaft and an adjustment handle arranged on the mounting base. A transmission assembly is provided between the telescopic shaft and the adjustment handle, which is used to control the telescopic action of the telescopic shaft by rotating the adjustment handle; a locking knob is threadedly connected to the mounting base, and the locking end of the locking knob abuts against the outer wall of the telescopic shaft.

[0017] The telescopic shaft and the adjustment handle are arranged on the pumping cylinder body through the mounting seat. The transmission assembly is used to realize the transmission from the circumferential rotation of the adjustment handle to the axial extension and contraction of the telescopic shaft. This is the existing technology and is not expanded. The locking knob is screwed on the pumping cylinder body. When the locking knob is screwed in, the locking end abuts against the telescopic shaft, limiting the telescopic movement of the telescopic shaft. When it is screwed out, the limit is released. The operation is convenient and the currently adjusted single flow state can be stabilized.

[0018] In the above-mentioned liquid quantitative conveyor, a docking rod is provided at the upper end of the piston, and the docking rod and the telescopic shaft of the fine-tuning micrometer are located on the same straight line. An observation port is provided on the side of the pumping cylinder body, and the observation port is located on the side of the docking rod and the telescopic shaft.

[0019] The piston is docked with the telescopic shaft through a docking rod, and the docking rod passes through the docking rod through-hole to exit the drive cavity. The docking rod and the docking rod through-hole are circumferentially sealed to ensure the sealing of the drive cavity. The observation port exposes the outer end of the docking rod and the lower end of the telescopic shaft inside, which is convenient for real-time inspection of the matching status between them.

[0020] In the above-mentioned liquid quantitative conveyor, the liquid storage tank is connected to the liquid inlet interface through a pipeline, and a filter assembly is provided on the pipeline.

[0021] A filter assembly is connected in series on the pipeline between the liquid storage tank and the liquid inlet interface to filter impurities in the passing liquid and ensure the quality of the output liquid.

[0022] In the above-mentioned liquid quantitative conveyor, a liquid filling port is provided on the top of the liquid storage tank, a tank cover is detachably provided on the liquid filling port, and an air filter is provided on the vent hole on the tank cover.

[0023] The liquid filling port is used to add the corresponding liquid to the liquid storage tank. The tank cover is detachable and used to close the liquid filling port. Its vent hole is used to balance the air pressure inside and outside the tank to ensure the smooth output of the internal liquid. The air filter is used to filter the passing air to prevent impurities from entering the tank.

[0024] In the above-mentioned liquid quantitative conveyor, a liquid level indicating structure is provided on the liquid storage tank, and the liquid level indicating structure includes a float floating on the liquid surface, and an indicating rod is connected to the float, and the indicating rod extends upward from a through hole at the upper end of the liquid storage tank; and / or the liquid level indicating structure also includes a liquid level gauge assembly arranged on the side of the liquid storage tank.

[0025] A float floats on the liquid surface, and an indicator rod extends from the upper end of the liquid storage tank. The height of the indicator rod allows the determination of the liquid level within. Furthermore, the indicator rod is provided with a scale that indicates the specific amount of liquid within. Furthermore, a liquid level gauge assembly can be installed on the side of the liquid storage tank to directly display the internal liquid level. This liquid level gauge assembly is common knowledge and will not be elaborated on in detail.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This liquid quantitative conveyor can be used to quantitatively convey liquid. The piston drive structure is used to drive the axial movement of the piston to change the pressure inside the liquid storage chamber, thereby achieving the effect of pumping the liquid in the liquid storage tank into the liquid storage chamber and outputting the liquid in the liquid storage chamber. Since only the liquid in the liquid storage chamber is output during a single action, the goal of single quantitative delivery is ensured.

[0028] 2. A driving chamber and a liquid storage chamber are formed on both sides of the piston respectively. The gas power component is connected to the driving chamber to drive the movement of the piston, which is equivalent to a cylinder and has a good driving effect.

[0029] 3. The flow rate adjustment structure controls the flow rate of the liquid output from the liquid storage chamber by adjusting the channel size of the air inlet connector, and can be applied to application scenarios with different flow rate requirements.

[0030] 4. The flow regulation structure controls the single liquid output flow by limiting the maximum pull-out distance of the piston. This is achieved through a fine-tuning micrometer and is easy to operate.

[0031] 5. The piston is docked with the telescopic shaft through the docking rod. The docking rod passes through the docking rod through-hole to exit the drive cavity. The observation port exposes the outer end of the docking rod and the lower end of the telescopic shaft, which is convenient for real-time inspection of the matching status between them. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0033] Figure 2 It is a simplified cross-sectional schematic diagram of the interior of the pumping cylinder provided by the utility model.

[0034] In the figure, there are a liquid storage tank 90, a pumping cylinder 91, a piston 92, a liquid storage chamber 93, a liquid inlet interface 94, a liquid outlet interface 95, a piston drive structure 96, a drive chamber 97, a solenoid valve assembly 98, an air inlet connector 99, a speed control valve assembly 100, a speed control knob 101, a fine adjustment micrometer 102, a mounting seat 103, a telescopic shaft 104, an adjusting handle 105, a locking knob 106, a docking rod 107, an observation port 108, a filter assembly 109, a liquid filling port 110, a tank cover 111, an air filter 112, a liquid level indicating structure 113, an indicating rod 114, and a liquid level meter assembly 115. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] Example 1

[0037] Specific implementation examples Figure 1 、 2 As shown, the present liquid quantitative conveyor comprises a liquid storage tank 90 and a pumping cylinder 91, wherein a piston 92 is slidably connected in the pumping cylinder 91, and a liquid storage chamber 93 is formed between the piston 92 and the pumping cylinder 91, and a liquid inlet interface 94 and a liquid outlet interface 95 are connected to the liquid storage chamber 93, and the liquid inlet interface 94 is connected to the liquid storage tank 90, and a one-way valve is provided on the liquid inlet interface 94 and the liquid outlet interface 95, and the piston 92 is driven by the piston driving structure 96 to move to compress or expand the liquid storage chamber 93.

[0038] Specifically, the liquid quantitative conveyor of the present invention is used for quantitatively conveying lubricating oil, wherein the liquid storage tank 90 is used to store the lubricating oil to be conveyed, and a cylindrical liquid storage chamber 93 is provided in the pumping cylinder 91, and the liquid storage chamber 93 is closed by a piston 92. The piston drive structure 96 is used to drive the axial movement of the piston 92 to change the pressure inside the liquid storage chamber 93. An annular seal is formed between the piston 92 and the inner wall of the liquid storage chamber 93. A one-way valve is provided on the liquid inlet interface 94 and the liquid outlet interface 95, so that the interface can only be used for the input or output of lubricating oil. When the piston 92 is withdrawn and the pressure decreases, the liquid inlet interface 94 draws the lubricating oil in the liquid storage tank 90 into the liquid storage chamber 93. Conversely, the lubricating oil in the liquid storage chamber 93 is pressed out from the liquid outlet interface 95. The single extrusion amount is the oil storage amount in the liquid storage chamber 93, thereby achieving the effect of quantitative conveying.

[0039] like Figure 1 、 2As shown, piston drive structure 96 includes a drive chamber 97 disposed between piston 92 and pumping cylinder 91. Drive chamber 97 and liquid storage chamber 93 are located on either side of piston 92. Drive chamber 97 is provided with an air inlet connector 99 and an air outlet connector. Air inlet connector 99 and air outlet connector 99 are connected to the gas power assembly via a solenoid valve assembly 98. Pumping cylinder 91 is provided with a flow rate adjustment structure, which includes a speed control valve assembly 100 disposed on the air inlet connector 99. Speed ​​control valve assembly 100 is provided with a speed adjustment knob 101.

[0040] Specifically, a drive chamber 97 and a liquid storage chamber 93 are formed on either side of piston 92, respectively. A gas power assembly is connected to drive chamber 97 to drive the movement of piston 92, acting as a cylinder. A solenoid valve assembly 98 controls the passage between the gas power assembly and drive chamber 97. A flow rate adjustment mechanism adjusts the channel size of inlet connector 99, thereby controlling the speed at which gas enters and the rate of pressure change in drive chamber 97. This effectively controls the flow rate of liquid output from liquid storage chamber 93, making it suitable for applications with varying flow rate requirements.

[0041] like Figure 1 As shown, a flow regulating structure is further provided between the side of the piston 92 away from the liquid storage chamber 93 and the pumping cylinder 91. The flow regulating structure includes a fine-tuning micrometer 102 provided on the cylinder body of the piston 92. The telescopic shaft 104 of the fine-tuning micrometer 102 is located on the movable path of the piston 92 and is used to limit the maximum pull-out distance of the piston 92. The fine-tuning micrometer 102 includes a mounting base 103 fixed on the pumping cylinder 91, and a telescopic shaft 104 and an adjustment handle 105 provided on the mounting base 103. A transmission assembly is provided between the telescopic shaft 104 and the adjustment handle 105 for controlling the telescopic movement of the telescopic shaft 104 by rotating the adjustment handle 105. A locking knob 106 is threadedly connected to the mounting base 103, and the locking end of the locking knob 106 abuts against the outer wall of the telescopic shaft 104. A docking rod 107 is provided at the upper end of the piston 92 , and the docking rod 107 is located on the same straight line as the telescopic shaft 104 of the fine-tuning micrometer 102 . An observation port 108 is provided on the side of the pumping cylinder body 91 , and the observation port 108 is located on the side of the docking rod 107 and the telescopic shaft 104 .

[0042] Specifically, the flow regulating structure controls the volume of the liquid storage chamber 93 by limiting the maximum pull-out distance of the piston 92, thereby controlling the flow rate of a single liquid output. This is specifically achieved through the fine-tuning micrometer 102. The telescopic shaft 104 of the fine-tuning micrometer 102 is located on the movable path of the piston 92. When the piston 92 is pulled out, it is offset from the telescopic shaft 104. At this time, the liquid storage chamber 93 is in a state of being fully absorbed with liquid in a single time. By adjusting the axial position of the telescopic shaft 104, the maximum pull-out distance of the piston 92 can be adjusted, thereby achieving effective control of the single output liquid volume. The telescopic shaft 104 and the adjustment handle 105 are mounted on the pumping cylinder 91 via a mounting base 103. The transmission assembly is used to transmit the circumferential rotation of the adjustment handle 105 to the axial extension of the telescopic shaft 104. This is a prior art and will not be elaborated. The locking knob 106 is screwed onto the pumping cylinder 91. When the locking knob 106 is screwed in, the locking end abuts against the telescopic shaft 104, limiting the telescopic movement of the telescopic shaft 104. When the locking knob 106 is screwed out, the limit is released. This is convenient to operate and can stabilize the current single flow state after adjustment. The piston 92 is docked with the telescopic shaft 104 via a docking rod 107. The docking rod 107 passes through the docking rod through hole and extends out of the drive chamber 97. The docking rod 107 and the docking rod through hole are circumferentially sealed to ensure the sealing of the drive chamber 97. The observation port 108 exposes the outer end of the docking rod 107 and the lower end of the telescopic shaft 104, facilitating real-time inspection of the coupling state between them.

[0043] As an optimization of this embodiment, the liquid storage tank 90 is connected to the liquid inlet interface 94 through a pipeline, and a filter assembly 109 is provided on the pipeline. The filter assembly 109 is connected in series on the pipeline between the liquid storage tank 90 and the liquid inlet interface 94 to filter impurities in the liquid to ensure the quality of the output liquid.

[0044] As an optimization of this embodiment, a liquid filling port 110 is provided on the top of the liquid storage tank 90 , a tank cover 111 is detachably provided on the liquid filling port 110 , and an air filter 112 is provided on the vent hole on the tank cover 111 .

[0045] Specifically, the liquid filling port 110 is used to add lubricating oil to the liquid storage tank 90, and the tank cover 111 is detachable and used to close the liquid filling port 110. Its vent hole is used to balance the air pressure inside and outside the tank to ensure the smooth output of the internal liquid. The air filter 112 is used to filter the passing air to prevent impurities from entering the tank.

[0046] As a further optimization, a liquid level indicating structure 113 is provided on the liquid storage tank 90. ​​The liquid level indicating structure 113 includes a float floating on the liquid surface, and the float is connected to an indicating rod 114. The indicating rod 114 extends upward from a through hole at the upper end of the liquid storage tank 90; the liquid level indicating structure 113 also includes a liquid level meter assembly 115 arranged on the side of the liquid storage tank 90.

[0047] Specifically, a float floats on the liquid surface, and an indicator rod 114 extends from the upper end of the liquid storage tank 90. ​​The height of the liquid inside can be determined by observing the height of the indicator rod 114. Furthermore, the indicator rod 114 is provided with a scale that indicates the specific amount of liquid inside. Furthermore, a liquid level gauge assembly 115 is also provided on the side of the liquid storage tank 90 to directly display the internal liquid level.

[0048] The specific working principle is: the liquid outlet interface 95 is connected to the liquid outlet pipe, and the liquid outlet pipe is connected to the position where lubricating oil is needed. When lubricating oil needs to be output, the gas power component is activated, and the piston 92 is pulled up until the outer end of its docking rod 107 is against the telescopic shaft 104, and the liquid storage chamber 93 draws lubricating oil from the liquid storage tank 90 through the liquid inlet interface 94. Then the gas power component drives the piston 92 to move in the opposite direction, and the oil in the liquid storage chamber 93 is output from the liquid outlet interface 95, realizing a single lubricating oil output.

[0049] Example 2

[0050] The specific working principle of this embodiment is basically the same as that of embodiment 1, and the difference lies in the piston drive structure 96.

[0051] In this embodiment, the piston drive structure 96 includes a drive motor, which is arranged on the pumping cylinder 91. The piston 92 is connected to the output end of the drive motor through a gear rack assembly. The gear rack assembly includes a rack axially arranged on the upper end of the piston 92, and the rack is meshed with the gear on the output end of the drive motor.

[0052] Specifically, the drive motor is driven through a rack and pinion assembly, the rack is fixed in the same direction to the upper end of the piston 92, the gear on the output end of the drive motor is engaged with the rack, and the output end of the drive motor is rotated to achieve the effect of axial movement of the drive rack, thereby controlling the extension and retraction action of the piston 92.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A liquid quantitative conveyor, comprising a liquid storage tank (90), characterized in that: The invention also includes a pumping cylinder (91), wherein a piston (92) is slidably connected to the pumping cylinder (91), and a liquid storage chamber (93) is formed between the piston (92) and the pumping cylinder (91). The liquid storage chamber (93) is connected to a liquid inlet interface (94) and a liquid outlet interface (95). The liquid inlet interface (94) is connected to a liquid storage tank (90), and a one-way valve is provided on the liquid inlet interface (94) and the liquid outlet interface (95). The piston (92) is driven by a piston driving structure (96) to move to compress or expand the liquid storage chamber (93).

2. The liquid quantitative delivery device according to claim 1, characterized in that: The piston drive structure (96) includes a drive chamber (97) arranged between the piston (92) and the pumping cylinder (91), the drive chamber (97) and the liquid storage chamber (93) are respectively located on both sides of the piston (92), and the drive chamber (97) is provided with an air inlet connector (99) and an air outlet connector, and the air inlet connector (99) and the air outlet connector are connected to the gas power component through the solenoid valve component (98).

3. The liquid quantitative delivery device according to claim 2, characterized in that: The pumping cylinder (91) is provided with a flow rate regulating structure, and the flow rate regulating structure includes a speed regulating valve assembly (100) arranged on the air inlet joint (99), and the speed regulating valve assembly (100) is provided with a speed regulating knob (101).

4. The liquid quantitative delivery device according to claim 1, characterized in that: The piston drive structure (96) includes a drive motor, which is arranged on the pumping cylinder (91). The piston (92) is connected to the output end of the drive motor through a screw transmission assembly or a gear rack assembly.

5. The liquid quantitative delivery device according to any one of claims 1 to 4, characterized in that: A flow regulating structure is also provided between the side of the piston (92) away from the liquid storage chamber (93) and the pumping cylinder (91). The flow regulating structure includes a fine-tuning micrometer (102) provided on the cylinder of the piston (92). The telescopic shaft (104) of the fine-tuning micrometer (102) is located on the movable path of the piston (92) and is used to limit the maximum pull-out distance of the piston (92).

6. The liquid quantitative delivery device according to claim 5, characterized in that: The fine adjustment micrometer (102) comprises a mounting seat (103) fixed on the pumping cylinder (91), and a telescopic shaft (104) and an adjustment handle (105) arranged on the mounting seat (103). A transmission assembly is provided between the telescopic shaft (104) and the adjustment handle (105), for controlling the telescopic movement of the telescopic shaft (104) by rotating the adjustment handle (105). The mounting seat (103) is connected to a locking knob (106) via a thread, and the locking end of the locking knob (106) abuts against the outer wall of the telescopic shaft (104).

7. The liquid quantitative delivery device according to claim 6, characterized in that: A docking rod (107) is provided at the upper end of the piston (92), and the docking rod (107) and the telescopic shaft (104) of the fine adjustment micrometer (102) are located on the same straight line. An observation port (108) is provided on the side of the pumping cylinder (91), and the observation port (108) is located on the side of the docking rod (107) and the telescopic shaft (104).

8. The liquid quantitative delivery device according to any one of claims 1 to 4, characterized in that: The liquid storage tank (90) is connected to the liquid inlet interface (94) via a pipeline, and a filter assembly (109) is provided on the pipeline.

9. The liquid quantitative delivery device according to any one of claims 1 to 4, characterized in that: The top of the liquid storage tank (90) is provided with a liquid filling port (110), a tank cover (111) is detachably provided on the liquid filling port (110), and an air filter (112) is provided on the vent hole on the tank cover (111).

10. The liquid quantitative delivery device according to any one of claims 1 to 4, characterized in that: The liquid storage tank (90) is provided with a liquid level indicating structure (113), the liquid level indicating structure (113) comprising a float floating on the liquid surface, the float being connected to an indicating rod (114), the indicating rod (114) passing upward from a through hole at the upper end of the liquid storage tank (90); And / or the liquid level indicating structure (113) further includes a liquid level meter assembly (115) arranged on the side of the liquid storage tank (90).

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