CN212406984U - Miniature check valve and be equipped with miniature air pump of this check valve - Google Patents

Abstract

The utility model provides a miniature check valve and be equipped with miniature air pump of this check valve, this miniature check valve include the valve barrel and embed the case in the inside fixed air chamber of valve barrel, and the inside of case is equipped with the cavity, and reset spring one end is located the cavity, the outer wall of case and the inner wall contact sliding fit of fixed air chamber, and a plurality of air vents that are linked together with the cavity are seted up to the end circumference that contracts in of case. The outer wall of the valve core of the utility model is in contact sliding fit with the inner wall of the valve sleeve, and the inner wall of the valve sleeve is used as a guide mechanism of the valve core, so that the high-speed reciprocating motion of the valve core in the fixed air chamber is more stable; the air flow channel reaches the exhaust hole through the cavity of the valve core, the air flow is large and smooth, and the response speed of opening or closing of the one-way valve is accelerated. The utility model discloses miniature check valve compact structure, it is small, be applicable to the high frequency and make the miniature air pump of pressing the occasion and use.

Description

Miniature check valve and be equipped with miniature air pump of this check valve

Technical Field

The utility model relates to a check valve among the pressure check-up technical field, concretely relates to miniature check valve of reliable operation, reaction sensitivity and be equipped with miniature air pump of this check valve.

Background

In the field pressure calibration occasion, a micro air pump is generally required to generate high-pressure air so as to realize preset pressure control, and in the process, the sealing and circulation of the high-pressure air are required to be realized by virtue of a one-way valve. The traditional one-way valve has the working principle that the valve core on the gas channel does high-frequency reciprocating motion under the action of pressure difference at two ends so as to realize the effects of one-way conduction and reverse cut-off. In a common micro one-way valve (see fig. 1A and 1B), a valve core 2 is located in a valve sleeve 3, a first sealing ring 5 is sleeved at the end part of the periphery of the valve core 2 and located at one end of an air inlet of the micro one-way valve, a return spring 1 is sleeved at the periphery of the valve core and located at one end of an air outlet of the micro one-way valve, a gap is formed between the outer wall of the valve core 2 and the inner wall of the valve sleeve 3, an air flow channel is a gap between the valve core 2 and the first sealing ring 5 and the inner wall of the valve sleeve 3, the valve sleeve 3 cannot play a guiding role for the high-speed reciprocating motion of the valve core 2 due to the fact that the outer wall of the valve core 2 is not in contact with the inner wall of the valve sleeve 3, the operation of the valve core 2 is unstable, and in the high-speed motion of the valve core 2, the valve core 2 may rotate to cause the jamming of the motion, the gap between the first sealing ring 5 and the inner wall of the valve sleeve 3 is reduced, the air resistance is large when high-pressure air passes through, the response characteristics of the one-way valve during opening and closing are affected, for example, the opening and closing speed is slow, the reaction is not timely, meanwhile, the first sealing ring 5 is easy to fall off, the sealing effect between the first sealing ring 5 and the inner wall of the valve sleeve 3 is poor, and the whole pressure making efficiency of the micro air pump is affected by permanent failure in serious cases.

SUMMERY OF THE UTILITY MODEL

In order to solve one or more of the above problems, the present invention provides a micro check valve.

The utility model adopts the following technical scheme:

a miniature one-way valve comprises a valve sleeve, wherein a fixed air chamber is arranged in the valve sleeve, a valve core is arranged in the fixed air chamber, a cavity (21) is arranged in the valve core (2), one side of the cavity (21) facing an exhaust hole (31) of the fixed air chamber (8) is an opening end, one end of a reset spring (1) is positioned in the cavity (21), and the other end of the reset spring extends out of the cavity (21) and abuts against the inner wall of the fixed air chamber (8); the outer wall of case (2) and the inner wall contact sliding fit of fixed air chamber (8), the one end that case (2) are located inlet port (41) of fixed air chamber (8) contracts in the shrink and forms interior end (23), the terminal surface of interior end (23) contracts for being used for sealed sealing surface (24) of inlet port (41), it is gapped between the inner wall of end (23) circumference and fixed air chamber (8) to contract in, it sets up a plurality of air vents (22) that are linked together with cavity (21) to contract in end (23) circumference to make fixed air chamber (8) and cavity (21) communicate.

In the miniature one-way valve, the valve sleeve (3) is of a cylindrical structure with one open end, the valve cover (4) is installed at the open end of the valve sleeve (3), the exhaust hole (31) is formed in the bottom of the valve sleeve (3), the air inlet hole (41) is formed in the valve cover (4), and the valve cover (4) seals the open end of the valve sleeve (3) so that the fixed air chamber (8) is formed inside the valve sleeve (3).

In the micro one-way valve, the inner side surface of the valve cover (4) is provided with an annular groove (42) for installing the first sealing ring (5), and the annular groove (42) is positioned on the periphery of the air inlet hole (41).

In the micro one-way valve, any one of the two side walls of the annular groove (42) inclines towards the groove to form a necking groove, and the first sealing ring (5) is embedded into the annular groove (42).

In the micro one-way valve, the outer edge of the side wall of the annular groove (42) is arc-shaped.

In the miniature one-way valve, the valve cover (4) is in threaded connection with the valve sleeve (3), and a groove for placing the second sealing ring (6) is formed in the joint of the valve cover (4) and the valve sleeve (3).

In the micro one-way valve, the first sealing ring (5) is a standard O-shaped sealing ring or a sealing gasket made of an elastic material.

The utility model provides a miniature air pump, this miniature air pump are equipped with high-pressure cylinder, and cylinder body (230) embeds there is a slidable piston (240), forms a changeable variable air chamber of volume (280) between piston (240) and cylinder body (240), with be provided with respectively on inlet channel and the exhaust passage of variable air chamber (280) intercommunication admit air check valve (260) and exhaust check valve (270), admit air check valve (260) and exhaust check valve (270) be above-mentioned arbitrary miniature check valve.

In the miniature air pump, a cylinder cover (250) is arranged at the bottom of the cylinder body (230), an air inlet hole (41) of the air inlet check valve (260) is communicated with a third through hole (2501) formed in the cylinder cover (250), and an air outlet hole (31) is communicated with a first through hole (2301) formed in the cylinder body (230) to form an air inlet channel; an air inlet hole (41) of the exhaust check valve (270) is communicated with a second through hole (2302) arranged on the cylinder body (230), and an exhaust hole (31) is communicated with a fourth through hole (2502) arranged on the cylinder cover (250) to form an exhaust channel.

In the miniature air pump, the outer walls of the end parts of the air inlet one-way valve (260) and the air outlet one-way valve (270) are provided with annular grooves, and a third sealing ring (7) is placed in each annular groove, so that the air inlet one-way valve (260) forms sealing on an air inlet channel and the air outlet one-way valve (270) forms sealing on an air outlet channel.

The utility model discloses owing to take above design, have following characteristics: the outer wall of the valve core of the miniature one-way valve is in contact sliding fit with the inner wall of the valve sleeve, the inner wall of the valve sleeve is used as a guide mechanism of the valve core, and the reset spring is positioned in the cavity of the valve core, so that the valve core can reciprocate stably at high speed in the fixed air chamber, and the phenomena of rotation and clamping stagnation can not occur in the operation process; the air flow channel reaches the exhaust hole through the cavity of the valve core, the air flow is large and stable, and the response speed of opening or closing of the one-way valve is accelerated; the first sealing ring is embedded into the valve cover and is always in a static state, and the first sealing ring is positioned in the necking groove, so that the falling and abrasion risks are reduced, the service life of the first sealing ring is prolonged, and the sealing effect of the first sealing ring is improved; the utility model discloses miniature check valve compact structure, it is small, the reliable operation can regard as the subassembly to assemble alone, but positive and negative installation is applicable to the high frequency and makes the miniature air pump of pressing the occasion and use.

Drawings

FIG. 1A is a schematic structural view of a conventional check valve in a closed state;

FIG. 1B is a schematic structural view of a conventional check valve in an open state;

fig. 2A is a schematic structural view of the micro check valve of the present invention in a closed state;

fig. 2B is a schematic structural view of the micro check valve according to the present invention in an open state;

fig. 2C is a cross-sectional view of the micro check valve of the present invention;

FIG. 2D is a schematic perspective view of the valve cartridge;

fig. 3 is a schematic structural diagram of an embodiment of the micro air pump of the present invention.

The main labels are as follows:

100-a miniature one-way valve;

1-a return spring;

2-valve core, 21-cavity, 22-vent hole, 23-inward-contracting end, and 24-sealing surface;

3-valve sleeve, 31-exhaust hole;

4-valve cover, 41-air inlet hole, 42-annular groove;

5-a first sealing ring; 6-a second sealing ring; 7-a third sealing ring; 8-a fixed air chamber;

200-a miniature air pump;

210-air pump main shaft; 220-a swing rod; 230-cylinder block, 2301-first through hole, 2302-second through hole; 240-a piston; 250-cylinder head, 2501-third through hole, 2502-fourth through hole; 260-air inlet one-way valve; 270-exhaust check valve; 280-variable air chamber.

Detailed Description

The micro check valve and the micro air pump with the check valve of the present invention will be described in detail with reference to the following embodiments and the accompanying drawings. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Fig. 3 is a structural example of the micro air pump 200 of the present invention. In this embodiment, the micro air pump 200 is provided with a high pressure cylinder, a slidable piston 240 is disposed in the cylinder block 230, a variable air chamber 280 with a variable volume is formed between the piston 240 and the cylinder block 230, a cylinder cover 250 is installed at the bottom of the cylinder block 230, a first through hole 2301 and a second through hole 2302 which are communicated with the variable air chamber 280 are respectively disposed at the bottom of the cylinder block 230, a third through hole 2501 and a fourth through hole 2502 which are communicated with the variable air chamber 280 are respectively disposed on the cylinder cover 250, an air inlet check valve 260 and an air outlet check valve 270 which are independent from each other are disposed between the cylinder block 230 and the cylinder cover 250, the air inlet check valve 260 is disposed between the first through hole 2301 and the third through hole 2501, the air outlet check valve 270 is disposed between the second through hole 2302 and the fourth through hole 2502, the air inlet check valve 260 and the air outlet check valve 270 are used for air compression and flow control, such that the air inlet check valve 260 can only communicate in an air inlet direction (i.e. a direction in, while the exhaust check valve 270 can be conducted only in the exhaust direction (i.e., the direction in which gas is exhausted from the variable plenum 280 through the exhaust check valve 270); the piston 240 is connected to the air pump main shaft 210 through a swing rod 220, the swing rod 220 is fixed to a non-axial position of the air pump main shaft 210 (the air pump main shaft 210 is an eccentric wheel with respect to the piston 240), and the air pump main shaft 210 is driven by a motor.

The utility model provides a miniature check valve 100, this miniature check valve 100 use in above-mentioned miniature air pump 200, not only can realize the function of general check valve, can also increase the operational reliability and the reaction sensitivity of miniature air pump, guarantee the miniaturized structure of air pump. Fig. 2A to 2C show the structure of the miniature check valve 100 of the present invention, the miniature check valve 100 is provided with a valve sleeve 3, the valve sleeve 3 is a cylindrical structure with an open end, the bottom of the valve sleeve 3 is provided with an exhaust hole 31, a valve cover 4 is installed at the open end of the valve sleeve 3, a valve core 2 is arranged in a fixed air chamber 8 formed by the valve cover 4 and the valve sleeve 3, the valve cover 4 is provided with an air inlet 41 communicated with the fixed air chamber 8, the inner side surface of the valve cover 4 is provided with an annular groove 42, and the annular groove 42 is located at the periphery of the air inlet 41 and is used for; referring to fig. 2D, the valve core 2 is a cylindrical shell structure, a cavity 21 is formed inside the valve core 2, one side of the cavity 21 facing the exhaust hole 31 is an open end, one end of the return spring 1 is located in the cavity 21, and the other end of the return spring extends out of the cavity 21 and abuts against the bottom of the valve sleeve 3; the outer wall of the valve core 2 is in contact sliding fit with the inner wall of the valve sleeve 3, one end of the valve core 2, which is positioned at the air inlet 41, is retracted, and the end is defined as an inward-retracted end 23, a gap is reserved between the circumferential direction of the inward-retracted end 23 and the inner wall of the fixed air chamber 8, and a plurality of vent holes 22 communicated with the cavity 21 are formed in the circumferential direction of the inward-retracted end 23, so that the fixed air chamber 8 is communicated with the cavity 21; the end face of the retraction end 23 is a sealing face 24, the sealing face 24 is matched with the first sealing ring 5, and in a natural state, the sealing face 24 compresses the first sealing ring 5 under the elastic action of the return spring 1, so that the air inlet 41 is sealed and isolated from the fixed air chamber 8 and the exhaust hole 31.

The return spring 1 is a helical compression spring whose stiffness coefficient is determined by the required opening pressure.

Preferably, any one of the two side walls of the annular groove 42 is inclined inwards to form a necking groove, and the first sealing ring 5 is embedded into the annular groove 42, so that the first sealing ring is not easy to fall off the annular groove 42 due to necking. The outer edge of the side wall of the annular groove 42 is arc-shaped, and the outer edge of the arc is in smooth contact with the first sealing ring 5, so that the first sealing ring 5 cannot be damaged, and the service life of the first sealing ring is prolonged.

In one embodiment, the valve cover 4 is in threaded connection with the valve housing 3, and the joint of the valve cover 4 and the valve housing 3 is provided with a groove for placing the second sealing ring 6, and the second sealing ring 6 prevents the gas in the fixed air chamber 8 from leaking from the joint of the two.

Preferably, the first seal ring 5 and the second seal ring 6 are standard O-ring seals. Obviously, the first seal ring 5 may be a seal made of another elastic material such as polytetrafluoroethylene or polychlorotrifluoroethylene. In another embodiment, the first sealing ring 5 can be eliminated, and the smooth surface on the inner side of the valve cover 4 is directly contacted with the sealing surface 24 of the valve core 2 to form a seal, and the sealing form requires that the smooth surface on the inner side of the valve cover 4 and the sealing surface 24 of the valve core 2 have high smoothness and verticality so that the smooth surface and the sealing surface can be sealed tightly.

Compared with the existing check valve, the outer wall of the valve core 2 of the miniature check valve 100 of the utility model is in contact sliding fit with the inner wall of the valve sleeve 3, the inner wall of the valve sleeve 3 is used as the guide mechanism of the valve core 2, and the reset spring 1 is positioned in the cavity 21 of the valve core 2, so that the valve core 2 can reciprocate more stably at high speed in the fixed air chamber 8, and the rotation and clamping stagnation phenomena can not occur in the operation process; the air flow channel reaches the exhaust hole 31 through the cavity 21 of the valve core 2, the air flow is large and smooth, and the response speed of opening or closing of the one-way valve is accelerated; the first sealing ring 5 is embedded into the valve cover 4 and is always in a static state, and the first sealing ring 5 is positioned in the necking groove, so that the falling and abrasion risks are reduced, and the service life and the sealing effect of the first sealing ring 5 are improved; the utility model discloses miniature check valve compact structure, it is small, the reliable operation can regard as the subassembly to assemble alone, but positive and negative installation is applicable to the high frequency and makes the miniature air pump of pressing the occasion and use.

After the assembly of the miniature check valve 100 of above-mentioned structure is accomplished, can set up between the high-pressure cylinder of miniature air pump 200 and high-pressure gas output pipeline (see fig. 3, high-pressure gas output pipeline is linked together with exhaust check valve 270, and fig. 3 does not show high-pressure gas output pipeline), admit air check valve 260 and exhaust check valve 270 and be the utility model discloses miniature check valve 100 all installs in the space that cylinder head 250 and cylinder block 230 formed. The inlet 41 of the micro check valve 100 as the inlet check valve 260 is communicated with a third through hole 2501 arranged on the cylinder cover 250, and the outlet 31 is communicated with a first through hole 2301 arranged on the cylinder body 230 to form an inlet channel; the micro check valve 100 as the exhaust check valve 270 has an intake port 41 communicating with a second through hole 2302 provided in the cylinder block 230, and an exhaust port 31 communicating with a fourth through hole 2502 provided in the cylinder head 250, thereby forming an exhaust passage.

Preferably, the outer wall of the end of the micro check valve 100 is provided with an annular groove, and a third sealing ring 7 is placed in the annular groove to prevent air leakage from the contact position of the micro check valve 100 with the cylinder body 230 and the cylinder cover 250, so that the air inlet check valve 260 forms a seal on the air inlet channel and the air outlet check valve 270 forms a seal on the air outlet channel.

In operation, the air pump spindle 210 is driven by the motor to rotate, and the swing rod 220 drives the piston 240 to perform reciprocating linear motion (i.e., left and right directions in fig. 3) in the cylinder block 230. When the piston 240 moves to the left, the volume of the variable air chamber 280 increases (i.e. the vacuum degree in the variable air chamber 280 increases), the difference between the gas pressure at the air inlet 41 of the air inlet check valve 260 and the gas pressure in the variable air chamber 280 (at this time, the variable air chamber 280 is communicated with the fixed air chamber 8, and the pressures of the two are the same) is larger than the elastic force of the return spring 1, so that the sealing surface 24 of the air inlet check valve 260 is far away from the first sealing ring 5 (i.e. the air inlet check valve 260 is opened, at this time, the exhaust check valve 270 is closed), the gas enters the variable air chamber 280 through the air inlet 41, the fixed air chamber 8, the vent hole 22 and the cavity 21 of the valve core 2 and the exhaust hole 31 of the valve sleeve 3, until the piston 240 moves to the leftmost end to complete the air suction process (in this process, when the difference between the pressure at the air inlet 41 of the, the sealing surface 24 of the air inlet check valve 260 is in pressing contact with the first sealing ring 5 for sealing, namely the air inlet check valve 260 is in a closed state); when the piston 240 moves rightwards, the volume of the variable air chamber 280 is continuously reduced in the movement process of the piston 240, the gas pressure in the variable air chamber 280 is continuously increased, at this time, both the check valves are in a closed state until the difference between the gas pressure in the variable air chamber 280 and the pressure at the exhaust hole 31 of the exhaust check valve 270 is greater than the elastic force of the return spring 1, the exhaust check valve 270 is opened (namely, the sealing surface 24 of the exhaust check valve 270 is far away from the first sealing ring 5), and high-pressure gas is exhausted to a high-pressure gas output pipeline or a specific container through the air inlet 41 of the exhaust check valve 270, the fixed air chamber 8, the vent hole 22 of the valve core 2, the cavity 21 and the exhaust hole 31 of the valve sleeve 3 until the piston 240 moves to the rightmost end to. The air suction and compression actions of the micro air pump 200 are continuously and circularly reciprocated, and finally, the air pressurization function is realized.

It will be understood by those skilled in the art that these examples or embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention, and that various equivalent modifications and changes may be made without departing from the scope of the present invention.

Claims (10)

1. A miniature one-way valve comprises a valve sleeve, wherein a fixed air chamber is arranged in the valve sleeve, and a valve core is arranged in the fixed air chamber, and is characterized in that a cavity (21) is arranged in the valve core (2), one side of the cavity (21) facing an exhaust hole (31) of the fixed air chamber (8) is an opening end, one end of a reset spring (1) is positioned in the cavity (21), and the other end of the reset spring extends out of the cavity (21) and abuts against the inner wall of the fixed air chamber (8); the outer wall of case (2) and the inner wall contact sliding fit of fixed air chamber (8), case (2) are located the one end of inlet port (41) of fixed air chamber (8) and contract inwards and form retraction end (23), and the terminal surface of retraction end (23) is for being used for sealed sealing surface (24) of inlet port (41), and it is gapped between the inner wall of retraction end (23) circumference and fixed air chamber (8), and a plurality of air vents (22) that are linked together with cavity (21) are seted up to retraction end (23) circumference.

2. The micro check valve according to claim 1, wherein the valve housing (3) is a cylindrical structure with one open end, the open end of the valve housing (3) is provided with a valve cover (4), the exhaust hole (31) is arranged at the bottom of the valve housing (3), the air inlet hole (41) is arranged on the valve cover (4), and the valve cover (4) seals the open end of the valve housing (3).

3. The micro non-return valve according to claim 2, characterized in that the inner side of the valve cover (4) is provided with an annular groove (42) for mounting the first sealing ring (5), the annular groove (42) being located at the periphery of the air inlet hole (41).

4. The micro check valve according to claim 3, wherein either one of the two side walls of the annular groove (42) is inclined inward to form a constricted groove, and the first seal ring (5) is fitted into the annular groove (42).

5. The micro check valve of claim 3, wherein the outer edge of the side wall of the annular groove (42) is arc-shaped.

6. The micro check valve according to any one of claims 2 to 5, characterized in that the valve cover (4) is in threaded connection with the valve housing (3), and a groove for placing the second sealing ring (6) is provided at the connection of the valve cover (4) and the valve housing (3).

7. The micro non-return valve according to any of claims 3 to 5, characterised in that the first sealing ring (5) is a standard O-ring or a gasket made of an elastic material.

8. A miniature air pump, there is high-pressure cylinder, the cylinder block (230) embeds a slidable piston (240), form a variable air chamber (280) of variable volume between cylinder block (230) and the piston (240), there are air inlet check valve (260) and air exhaust check valve (270) on air inlet passage and air exhaust passage communicated with variable air chamber (280) separately, characterized by, said air inlet check valve (260) and air exhaust check valve (270) are the miniature check valve of any claim 1 to 7.

9. The miniature air pump according to claim 8, wherein a cylinder cover (250) is installed at the bottom of the cylinder body (230), the air inlet hole (41) of the air inlet check valve (260) is communicated with a third through hole (2501) formed on the cylinder cover (250), and the air outlet hole (31) is communicated with a first through hole (2301) formed on the cylinder body (230) to form an air inlet channel; an air inlet hole (41) of the exhaust check valve (270) is communicated with a second through hole (2302) arranged on the cylinder body (230), and an exhaust hole (31) is communicated with a fourth through hole (2502) arranged on the cylinder cover (250) to form an exhaust channel.

10. The micro air pump according to claim 9, wherein the outer walls of the end portions of the inlet check valve (260) and the outlet check valve (270) are provided with annular grooves, and the third sealing rings (7) are placed in the annular grooves.

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