Air inlet valve structure of air compressor

Abstract

The air inlet valve structure of the air compressor comprises a valve body, an air inlet cavity is formed in the valve body, and a valve plate and a piston assembly are arranged in the air inlet cavity; the piston assembly comprises a piston, a valve rod, a first spring and a second spring. A piston chamber is arranged beside the air inlet cavity, a sealing cover is arranged at one end of the piston chamber, and an air source inlet is formed in the other end of the piston chamber. The piston is arranged in the piston chamber in a sliding mode, the valve rod penetrates through the sealing cover in a sliding mode and is inserted into the air inlet, and the valve plate is arranged on the valve rod in a sliding and sleeving mode. The first spring is arranged between the valve plate and the sealing cover in an abutting mode, and the second spring is arranged between the sealing cover and the piston in an abutting mode. A gas outlet of the gas inlet cavity is communicated to a gas inlet end of the compressor host, and a gas source inlet is communicated with a gas outlet end of the oil-gas separation tank through a gas control pipeline; compared with an existing structure, the air inlet valve structure only needs to be provided with two springs and one control air source, the structure is simple and easy to assemble, a corresponding unit air control system is simple and easy to operate, and the air inlet valve structure is more stable and efficient in actual use.

Description

TECHNICAL FIELD

[0001] The utility model relates to air inlet valve technical field, concretely relates to an air inlet valve structure of air compressor. BACKGROUND

[0002] Air inlet valve is one of important components of air compressor, and it controls the loading and unloading of air compressor, so the performance of the whole compressor becomes particularly important. The structure of the existing air inlet valve is shown in the figure, the control gas source is introduced into the cavity on both sides of piston 11 through A and B to adjust the pressure difference on both sides of piston 11, and piston 11 is driven to move left and right in piston chamber 7 by the force between the pressure difference and three springs, so that valve plate 5 is driven to move left and right by valve rod 12 fixedly connected with piston 11, to open or close the air inlet of air inlet valve 3. However, in order to match the force on valve plate 5, the above-mentioned air inlet valve structure needs to be provided with three springs and connected with two control gas sources, which is complex in structure, difficult to assemble, and the corresponding unit gas control system is not easy to operate, and is not stable and efficient in actual use. Figure 1 SUMMARY Therefore, the embodiment of the utility model provides an air inlet valve structure of air compressor to solve the technical problem that the existing air inlet valve structure is complex, difficult to assemble and operate, and not stable and efficient in actual use.

[0003] The utility model discloses an air inlet valve structure of air compressor, including the valve body, be equipped with the air inlet cavity in the valve body, the air inlet cavity is equipped with the air inlet and the air outlet, be equipped with the valve plate and the piston assembly for driving the valve plate seal the air inlet in the air inlet cavity, the piston assembly includes the piston, with the piston fixed connection valve rod and the first spring and the second spring of the sleeve setting on the valve rod, the air inlet cavity's side is provided with the piston chamber, the piston chamber with the air inlet opposite is provided, and the end of the piston chamber towards the air inlet is equipped with the end of the piston chamber away from the air inlet is equipped with the gas source entrance for the control gas source to enter, the piston is slidably arranged in the piston chamber, and can reciprocatingly move to the direction close to or away from the air inlet, the valve rod can slidably pass through the cover and insert to the air inlet, the valve plate can slidably sleeve setting on the valve rod, be equipped with the limiting step on the valve rod for limiting the sliding distance of the valve plate, the first spring is located between the valve plate and the cover, for the valve plate is added to make its elastic force seal the air inlet, the second spring is located between the cover and the piston, for the piston is added to make its elastic force away from the cover,

[0004]

[0005] ​The gas outlet is communicated to the gas inlet of the oil-gas separation tank.

[0006] Optionally, the gas control pipeline comprises a first gas control pipeline, a second gas control pipeline and a third gas control pipeline arranged in parallel, a three-way electromagnetic valve A in a normally closed state is installed on the first gas control pipeline, a three-way electromagnetic valve B in a normally open state is installed on the second gas control pipeline, and a three-way electromagnetic valve C in a normally open state is installed on the third gas control pipeline; the gas inlet ends of the first gas control pipeline, the second gas control pipeline and the third gas control pipeline are all communicated to the gas outlet end of the oil-gas separation tank, the gas outlet ends of the first gas control pipeline and the third gas control pipeline are respectively communicated to two gas inlet ends of a first shuttle valve, the gas outlet end of the second gas control pipeline and the gas outlet end of the first shuttle valve are respectively communicated to two gas inlet ends of a second shuttle valve, and the gas outlet end of the second shuttle valve is communicated to the gas source inlet.

[0007] Optionally, a one-way valve is arranged between the three-way electromagnetic valve A and the gas inlet end of the first gas control pipeline, and a gas storage tank is communicated to the three-way electromagnetic valve A through a branch.

[0008] Optionally, a pressure regulating valve and a throttle are arranged between the three-way electromagnetic valve B and the second shuttle valve.

[0009] Optionally, an unloading hole is arranged on the valve body and communicated to the gas inlet cavity, and the unloading hole is communicated to the gas outlet end of the oil-gas separation tank through a circulating unloading valve.

[0010] Optionally, a sealing gasket for sealing cooperation with the valve plate is embedded on the side of the gas inlet port facing the valve plate.

[0011] Optionally, a guide seat is arranged in the gas inlet port, a guide hole coaxially arranged with the valve rod is arranged on the guide seat, and the valve rod is slidably inserted into the guide hole.

[0012] Optionally, the cover is detachably installed on the piston chamber through a snap spring, and the cover and the piston chamber are sealingly cooperated.

[0013] Optionally, an O-shaped sealing ring is embedded on the outer periphery of the piston.

[0014] The embodiment of the utility model has the following beneficial effects: adjusting the installation position of the spring, using two springs to replace the original three spring air inlet valve structure, matching the force between the two springs, and combining the vacuum degree when the compressor works, the natural suction force generated when the compressor works can easily open the valve plate; when air volume is adjusted, only one way of control gas source is needed to be introduced to the side of the piston away from the air inlet, the air pressure is used to overcome the force of the two springs and the natural suction force, the opening of the valve plate can be adjusted, and the air intake is reduced; when the customer does not use, the pressure of the control gas source can be increased to push the valve plate to completely close the air inlet; compared with the existing air inlet valve structure, the air inlet valve structure provided by the application only needs to set two springs and one way of control gas source, the structure is simple, easy to assemble, and the corresponding unit gas control system is simple and easy to operate, and is more stable and efficient in actual use. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0016] Figure 1 It is the structural schematic diagram of the existing air inlet valve;

[0017] Figure 2 It is the structural schematic diagram of the air inlet valve provided by the embodiment of the utility model;

[0018] Figure 3 It is the system connection diagram of the embodiment of the utility model;

[0019] The numbers in the figure represent:

[0020] 1, valve body;2, air inlet cavity;3, air inlet;4, air outlet;5, valve plate;6, sealing gasket;7, piston chamber;8, cover;9, gas source inlet;10, snap spring;11, piston;12, valve rod;13, first spring;14, second spring;15, O-shaped sealing ring;16, guide seat;17, compressor host;18, oil-gas separation tank;19, first gas control pipeline;20, second gas control pipeline;21, third gas control pipeline;22, three-position electromagnetic valve A;23, three-position electromagnetic valve B;24, three-position electromagnetic valve C;25, first shuttle valve;26, second shuttle valve;27, check valve;28, gas storage tank;29, pressure regulating valve;30, throttling element;31, unloading hole;32, circulating unloading valve. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application. In addition, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second", etc. can explicitly or implicitly include one or more features.

[0022] Please refer to Figure 2 The utility model discloses an air compressor's air inlet valve structure, including valve body 1, be equipped with air inlet chamber 2 in valve body 1, air inlet chamber 2 is equipped with air inlet 3 and air outlet 4, be equipped with valve plate 5 and the piston assembly for driving valve plate 5 seal air inlet 3 in air inlet chamber 2, to guarantee the sealing effect, can be embedded in the side of air inlet 3 towards valve plate 5 for with valve plate 5 sealed cooperation's sealing pad 6.

[0023] The side of air inlet chamber 2 is equipped with piston chamber 7, and piston chamber 7 is opposite to the setting of air inlet 3, and the end of piston chamber 7 towards air inlet 3 is equipped with the cover of sealing cover 8, and the end of piston chamber 7 away from air inlet 3 is equipped with the gas source inlet 9 for the control gas source to enter. Specifically, the sealing cover 8 is detachably installed to the piston chamber 7 by the snap spring 10 in the utility model embodiment, and the sealing cooperation is facilitated between the sealing cover 8 and the piston chamber 7, to guarantee the sealing property of piston chamber 7.

[0024] The piston assembly includes piston 11, valve rod 12 fixedly connected with piston 11 and first spring 13 and second spring 14 sleeved on valve rod 12. Among them, piston 11 is slidably arranged in piston chamber 7, and can reciprocate towards the direction close to or away from air inlet 3, and the outer periphery of piston 11 is embedded with O-shaped sealing ring 15. Valve rod 12 can slide through sealing cover 8 and is inserted into air inlet 3, and air inlet 3 is provided with guide seat 16, and the guide hole coaxial with valve rod 12 is formed in guide seat 16, and valve rod 12 is slidably inserted into the guide hole, to improve the stability and reliability of valve rod 12 movement. Valve plate 5 is slidably sleeved on valve rod 12, and valve rod 12 is provided with a limiting step for limiting the sliding distance of valve plate 5. First spring 13 is arranged between valve plate 5 and sealing cover 8, for applying elastic force to valve plate 5 to seal air inlet 3, and second spring 14 is arranged between sealing cover 8 and piston 11, for applying elastic force to piston 11 to move away from sealing cover 8.

[0025] As Figure 3As shown, the gas outlet 4 is communicated to the gas inlet end of the compressor main 17, the gas outlet end of the compressor main 17 is communicated to the gas inlet end of the oil-gas separation tank 18, and the gas outlet end of the oil-gas separation tank 18 is communicated to the gas source inlet 9 through the air control pipeline to take the compressed gas separated from the oil-gas separation tank 18 as the control gas source for driving the piston 11 to move. When the compressor is started, the gas in the gas inlet cavity 2 is sucked into the compressor main 17 to generate negative pressure in the gas inlet cavity 2, and when the natural suction force formed by the negative pressure is greater than the elastic force of the first spring 13, the valve plate 5 can move away from the gas inlet port 3 along the valve rod 12 to open the gas inlet port 3, thereby ensuring the normal operation of the compressor. When it is necessary to adjust the gas inlet flow of the gas inlet valve, the control gas source can be introduced into the piston chamber 7 through the air control pipeline, the gas source pressure is used to overcome the force of the two springs and the natural suction force, the piston 11 drives the valve rod 12 to move towards the gas inlet port 3, thereby pushing the valve plate 5 towards the gas inlet port 3 to adjust the opening of the valve plate 5 and reduce the gas inlet amount. When the compressor needs to stop running, the valve plate 5 is moved to completely close the gas inlet port 3 by increasing the gas source pressure, and then the control gas source is stopped, and the piston 11 and the valve rod 12 are reset under the action of the two springs.

[0026] Specifically, the air control pipeline in the embodiment of the utility model includes the first air control pipeline 19, the second air control pipeline 20 and the third air control pipeline 21 which are arranged in parallel, the first air control pipeline 19 is installed with the three-position electromagnetic valve A 22 in the normally closed state, the second air control pipeline 20 is installed with the three-position electromagnetic valve B 23 in the normally open state, and the third air control pipeline 21 is installed with the three-position electromagnetic valve C 24 in the normally open state. Wherein, the gas inlet end of the first air control pipeline 19, the second air control pipeline 20 and the third air control pipeline 21 are all communicated to the gas outlet end of the oil-gas separation tank 18, the gas outlet end of the first air control pipeline 19 and the third air control pipeline 21 are respectively communicated to the two gas inlet ends of the first shuttle valve 25, the gas outlet end of the second air control pipeline 20 and the first shuttle valve 25 are respectively communicated to the two gas inlet ends of the second shuttle valve 26, and the gas outlet end of the second shuttle valve 26 is communicated to the gas source inlet 9.

[0027] Further, the three-position electromagnetic valve A 22 and the gas inlet end of the first air control pipeline 19 are provided with a one-way valve 27, the one-way valve 27 and the three-position electromagnetic valve A 22 are communicated with the gas storage tank 28 through a branch, and the compressed gas stored in the gas storage tank 28 can be used as the standby gas source of the first air control pipeline 19. The three-position electromagnetic valve B 23 and the second shuttle valve 26 are provided with a pressure regulating valve 29 and a throttling element 30 to adjust the gas pressure of the gas outlet end of the second air control pipeline 20.

[0028] Further, the valve body 1 is also provided with an unloading hole 31 communicated with the gas inlet cavity 2, the unloading hole 31 is communicated with the gas outlet end of the oil-gas separation tank 18 through a circulating unloading valve 32, and the compressed gas in the third air control pipeline 21 can be used as the control gas source of the circulating unloading valve 32.

[0029] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the technical solutions and core ideas of the present application. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An air compressor's air inlet valve structure, comprising a valve body, an air inlet cavity is arranged in the valve body, the air inlet cavity is provided with an air inlet port and an air outlet port, a valve plate and a piston assembly for driving the valve plate to seal the air inlet port are arranged in the air inlet cavity, characterized in that: The piston assembly comprises a piston, a valve rod fixedly connected with the piston, and a first spring and a second spring sleeved on the valve rod; a piston chamber is arranged beside the intake cavity, and the piston chamber is arranged opposite to the intake port; a sealing cover is arranged at one end of the piston chamber facing the intake port, and an air source inlet for allowing a control air source to enter is arranged at the other end of the piston chamber away from the intake port; the piston is slidably arranged in the piston chamber and can reciprocate towards the intake port or away from the intake port; the valve rod is slidably inserted into the intake port through the sealing cover; the valve plate is slidably sleeved on the valve rod, and a limiting step for limiting the sliding distance of the valve plate is arranged on the valve rod; the first spring is arranged between the valve plate and the sealing cover and used for applying an elastic force to the valve plate to make the valve plate seal the intake port; and the second spring is arranged between the sealing cover and the piston and used for applying an elastic force to the piston to make the piston away from the sealing cover. The gas outlet is connected to the air inlet of the compressor host, the air outlet of the compressor host is connected to the air inlet of the oil-gas separation tank, and the air outlet of the oil-gas separation tank is connected to the air source inlet through the gas control pipeline.

2. An air compressor inlet valve structure according to claim 1, wherein: The gas control pipeline comprises a first gas control pipeline, a second gas control pipeline and a third gas control pipeline arranged in parallel, a three-way electromagnetic valve A in a normally closed state is installed on the first gas control pipeline, a three-way electromagnetic valve B in a normally open state is installed on the second gas control pipeline, and a three-way electromagnetic valve C in a normally open state is installed on the third gas control pipeline; the air inlets of the first gas control pipeline, the second gas control pipeline and the third gas control pipeline are all connected to the air outlet of the oil-gas separation tank, the air outlets of the first gas control pipeline and the third gas control pipeline are respectively connected to two air inlets of a first shuttle valve, the air outlet of the second gas control pipeline and the air outlet of the first shuttle valve are respectively connected to two air inlets of a second shuttle valve, and the air outlet of the second shuttle valve is connected to the air source inlet.

3. An air compressor inlet valve structure according to claim 2, wherein: A one-way valve is arranged between the three-way electromagnetic valve A and the air inlet of the first gas control pipeline, and the one-way valve is connected to a gas storage tank through a branch.

4. An air compressor inlet valve structure according to claim 2, wherein: A pressure regulating valve and a throttle are arranged between the three-way electromagnetic valve B and the second shuttle valve.

5. The air compressor inlet valve structure of claim 1, wherein: An unloading hole is arranged in the valve body and connected to the air outlet of the oil-gas separation tank through a circulating unloading valve.

6. The air compressor inlet valve structure of claim 1, wherein: A sealing gasket is embedded on the side of the intake port facing the valve plate.

7. The air compressor inlet valve structure of claim 1, wherein: A guide seat is arranged in the intake port, a guide hole coaxial with the valve rod is arranged in the guide seat, and the valve rod is slidably inserted into the guide hole.

8. The air compressor inlet valve structure of claim 1, wherein: The sealing cover is detachably installed on the piston chamber by a snap spring, and the sealing cover is sealingly connected to the piston chamber.

9. The air compressor inlet valve structure of claim 1, wherein: An O-shaped sealing ring is embedded on the outer periphery of the piston.

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