CN222350886U

CN222350886U - Pneumatic metering pump

Info

Publication number: CN222350886U
Application number: CN202421153542.8U
Authority: CN
Inventors: 盘其海
Original assignee: Foshan Haiwu Technology Co ltd
Current assignee: Foshan Haiwu Technology Co ltd
Priority date: 2024-05-24
Filing date: 2024-05-24
Publication date: 2025-01-14
Anticipated expiration: 2034-05-24

Abstract

The utility model relates to the technical field of metering pumps, and provides a pneumatic metering pump which comprises a one-way valve, a metering mechanism, a driving mechanism and a control mechanism. The one-way valve is provided with a storage cavity, a metering cylinder body of the metering mechanism is communicated with the storage cavity, a metering piston is connected in the metering cylinder body in a sliding mode to change the size of the storage cavity, a driving piece of the driving mechanism is connected with the metering piston, a first driving cavity and a second driving cavity are formed in the driving cylinder body, the control mechanism comprises an electromagnetic valve and an adjusting screw, the electromagnetic valve controls the driving piston to slide in a reciprocating mode, and the adjusting screw adjusts the stroke of the driving piston. The pneumatic metering pump provided by the utility model has the advantages that the movement control of the metering piston is easier through the electromagnetic valve, the movement of the metering piston can be controlled without more control components, the structure of the metering pump can be simplified, the cost is reduced, and the control precision is high, so that the movement of the metering piston is more accurate, and the precision of the pneumatic metering pump is improved.

Description

Pneumatic metering pump

Technical Field

The utility model relates to the technical field of metering pumps, in particular to a pneumatic metering pump.

Background

Metering pumps are a type of fluid delivery machinery that are distinguished by the ability to maintain a constant flow rate independent of discharge pressure. The metering pump can simultaneously complete the functions of conveying, metering and adjusting, thereby simplifying the production process flow. By using a plurality of metering pumps, a plurality of mediums can be input into the process flow according to an accurate proportion for mixing. Due to its own prominence, metering pumps are now widely used in various industrial fields of petrochemical industry, pharmaceutical industry, food industry, and the like.

The metering pump in the prior art controls the movement stroke of a driving piece in the driving mechanism to enable a metering piston of the metering mechanism to do reciprocating sliding movement of corresponding stroke, so that the size of the storage cavity of the one-way valve is alternately changed to suck or pump materials, and the purpose of quantitatively conveying the materials is achieved.

However, in the related metering pump technology, the movement control of the metering piston is difficult, and a large number of control components are required, so that the metering pump has a complex structure, high manufacturing cost and poor accuracy.

Disclosure of utility model

In order to overcome the defects in the prior art, the utility model provides the pneumatic metering pump, which is used for solving at least one technical defect in the prior art, so that the movement control of the metering piston of the pneumatic metering pump is easier, more control components are not needed, the structure of the metering pump can be simplified, the manufacturing cost is reduced, and the accuracy is improved.

In order to achieve the object of the present utility model, the present utility model provides a pneumatic metering pump comprising:

the one-way valve is provided with a feeding port, a discharging port and a storage cavity which are communicated with each other;

The metering mechanism comprises a metering cylinder body and a metering piston, the metering cylinder body is communicated with the storage cavity, and the metering piston is connected in the metering cylinder body in a sliding manner and is suitable for changing the volume of the storage cavity;

The driving mechanism comprises a driving piece, a driving piston and a driving cylinder body, wherein the first end of the driving piece is connected with the metering piston, the second end of the driving piece is connected with the driving piston, the driving piston is connected in the driving cylinder body in a sliding way,

The driving piston divides the driving cylinder body into a first driving cavity and a second driving cavity;

the control mechanism comprises an electromagnetic valve and an adjusting screw rod,

The electromagnetic valve is provided with a first air delivery port and a second air delivery port, the first air delivery port is communicated with the first driving cavity, the second air delivery port is communicated with the second driving cavity,

The electromagnetic valve controls the first air delivery port and the second air delivery port to alternately ventilate so as to control the driving piston to slide back and forth along the axial direction of the driving cylinder body,

The adjusting screw rod stretches into the second driving cavity through spiral connection and is suitable for adjusting the sliding stroke of the driving piston in the driving cylinder body.

Preferably, the control mechanism further comprises a gas exchange valve,

The air exchange valve is arranged on the driving cylinder body and extends into the first driving cavity, the air exchange valve is communicated with the electromagnetic valve,

When the driving piston is abutted with the air exchange valve, the first air delivery port of the electromagnetic valve outputs air, the air flows into the first driving cavity to drive the driving piston to slide towards the second driving cavity,

When the driving piston is separated from the air exchange valve, the second air delivery port of the electromagnetic valve outputs air, and the air flows into the second driving cavity so as to drive the driving piston to slide towards the first driving cavity.

Preferably, the air exchange valve comprises an elastic piece, an air exchange valve core and an air exchange valve core seat;

The elastic piece is arranged in the air exchange valve core seat and is respectively in butt joint with the air exchange valve core seat and the air exchange valve core, so that the air exchange valve core and the air exchange valve core seat can be connected in a telescopic way;

The air exchange valve core is arranged on the driving cylinder body and extends into the first driving cavity;

When the driving piston is abutted with the ventilation valve core, the gas of the first driving cavity is led to the electromagnetic valve through the ventilation valve core, so that a first gas delivery port of the electromagnetic valve is opened,

When the driving piston is separated from the ventilation valve core, the gas in the first driving cavity is disconnected from the electromagnetic valve, so that the second gas transmission port of the electromagnetic valve is opened.

Preferably, the control mechanism further comprises a first throttle valve and a second throttle valve,

The first throttle valve is arranged between the first air conveying port and the first driving cavity, and the second throttle valve is arranged between the second air conveying port and the second driving cavity.

Preferably, the part of the adjusting screw extending out of the outside is provided with scales.

Preferably, the metering mechanism further comprises a metering inner cylinder, the metering inner cylinder is arranged in the metering cylinder, and the metering piston is connected with the metering inner cylinder in a sliding manner;

The driving mechanism further comprises a driving inner cylinder, the driving inner cylinder is arranged in the driving cylinder, and the driving piston is connected with the driving inner cylinder in a sliding manner.

Preferably, the sealing device also comprises a first sealing ring and a second sealing ring,

The first sealing ring is arranged between the metering piston and the metering inner cylinder, and the second sealing ring is arranged between the driving piston and the driving inner cylinder.

Preferably, the muffler further comprises a first muffler, a second muffler and a third muffler,

The first muffler is communicated with the first gas transmission port, the second muffler is communicated with the second gas transmission port, and the third muffler is communicated with the air exchange valve.

Preferably, the metering cylinder is provided with an observation window, the observation window being located between the metering piston and the driving member.

Preferably, the control mechanism further comprises a first lock cylinder, and the first lock cylinder passes through the driving cylinder body to be abutted with the adjusting screw rod through screw connection.

The pneumatic metering pump has the advantages that the pneumatic metering pump is provided, the reciprocating sliding motion of the driving piston in the driving cylinder body is controlled through the electromagnetic valve with the first air conveying port and the second air conveying port, the driving piece is respectively connected with the driving piston and the metering piston to control the reciprocating sliding motion of the metering piston in the metering cylinder body, meanwhile, the adjusting screw rod stretches into the second driving cavity in a spiral connection mode to adjust the sliding stroke of the driving piston in the driving cylinder body, under the connection effect of the driving piece, the sliding stroke of the metering piston in the metering cylinder body can be adjusted by the adjusting screw rod, the electromagnetic valve alternately ventilates the first air conveying port and the second air conveying port and the spiral adjustment of the adjusting screw rod can enable the motion control of the metering piston to be easier, more control components are not needed, the motion of the metering piston can be controlled to realize the adjustment of a rated metering value, the structure of the metering pump can be simplified, the manufacturing cost is reduced, the electromagnetic valve has high control precision of alternate ventilation, and the motion of the metering piston is more accurate, and the pneumatic precision is improved.

Drawings

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments of the utility model, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intentionally drawn to scale on actual size or the like, with emphasis on illustrating the principles of the utility model.

FIG. 1 is a schematic diagram of the overall structure of a pneumatic metering pump according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of A-A of FIG. 1;

FIG. 3 is a cross-sectional view of B-B of FIG. 1;

FIG. 4 is a cross-sectional view of C-C of FIG. 3;

FIG. 5 is an enlarged view of FIG. 4 at A;

fig. 6 is a schematic diagram of a pneumatic metering pump gas circuit according to an embodiment of the present utility model.

In the figure:

100. 110, a feed inlet, 120, a discharge outlet, 130, a storage cavity;

200. The device comprises a metering mechanism, a metering cylinder body, a 211, an observation window, a 220, a metering piston, a 230 and a metering inner cylinder;

300. The device comprises a driving mechanism, 310, a driving piece, 320, a driving piston, 330, a driving cylinder body, 331, a first driving cavity, 332, a second driving cavity, 333, a ventilation joint and 340, and a driving inner cylinder;

400. The control mechanism comprises a control mechanism body 410, an electromagnetic valve 411, a first air delivery port, a second air delivery port 412, a feedback joint 413, a 420, an adjusting screw rod 421, an adjusting nut 430, a gas exchange valve 431, an elastic piece 432, a gas exchange valve core 433, a gas exchange valve core seat 440, a first throttle valve 450, a second throttle valve 460 and a first lock cylinder;

500. A first seal ring;

600. A second seal ring;

700. First muffler 710, second muffler 720 and third muffler.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Embodiments of the present utility model are described below with reference to fig. 1 to 6. It should be understood that the following description is only illustrative of embodiments of the utility model and is not intended to limit the utility model in any way.

Referring to fig. 1 to 6, an embodiment of the present utility model provides a pneumatic metering pump including a check valve 100, a metering mechanism 200, a driving mechanism 300, and a control mechanism 400.

The check valve 100 has a feed inlet 110, a discharge outlet 120 and a storage chamber 130, which are mutually communicated.

The metering mechanism 200 includes a metering cylinder 210 and a metering piston 220. The metering cylinder 210 is communicated with the storage cavity 130, and the metering piston 220 is slidably connected in the metering cylinder 210. The size of the volume of the accumulator chamber 130 may be changed as the metering piston 220 slides within the metering cylinder 210.

That is, the volume of the accumulator chamber 130 may vary as the metering piston 220 slides.

When the metering piston 220 slides along the second axial direction (i.e., the right side of fig. 2) of the metering cylinder 210, the volume of the storage chamber 130 increases, a negative pressure is formed in the storage chamber 130, and external materials can enter the storage chamber 130 through the feed inlet 110.

When the metering piston 220 slides along the first axial direction (i.e., the left side in fig. 2) of the metering cylinder 210, the volume of the storage cavity 130 becomes smaller, the storage cavity 130 is extruded by the metering piston 220, and the material in the storage cavity 130 can be discharged from the outside through the discharge port 120, so that the material can be conveyed by the reciprocating movement of the metering piston 220 along the first direction and the second direction.

The drive mechanism 300 includes a drive 310, a drive piston 320, and a drive cylinder 330. The first end of the driver 310 is connected to the metering piston 220, the second end of the driver 310 is connected to the driver piston 320, and the driver piston 320 is slidably coupled within the driver cylinder 330. The driving member 310 may be a driving plunger, where a first end of the driving plunger is connected to the metering piston 220, and a second end of the driving plunger is connected to the driving piston 320, and when the driving piston 320 reciprocates in the driving cylinder 330, the driving plunger may drive the metering piston 220 to reciprocate in the metering cylinder 210, so as to change the volume of the storage cavity 130 alternately.

The driving piston 320 is slidably coupled within the driving cylinder 330, and may divide the driving cylinder 330 into a first driving chamber 331 and a second driving chamber 332.

The control mechanism 400 includes a solenoid valve 410 and an adjustment screw 420.

The solenoid valve 410 has a first gas transfer port 411 and a second gas transfer port 412, the first gas transfer port 411 being in communication with the first drive chamber 331 and the second gas transfer port 412 being in communication with the second drive chamber 332.

The solenoid valve 410 controls the first air delivery port 411 and the second air delivery port 412 to alternately ventilate, and can control the driving piston 320 to reciprocally slide along the axial direction of the driving cylinder 330.

Specifically, when the solenoid valve 410 controls the first gas delivery port 411 to open, gas enters the first driving chamber 331, so that the driving piston 320 slides along the second direction of the axial direction of the driving cylinder 330, and by the action of the driving plunger, the metering piston 220 also slides along the second direction of the axial direction of the metering cylinder 210 (i.e. the right side of fig. 2), so that the volume of the storage chamber 130 becomes larger.

When the solenoid valve 410 controls the second gas delivery port 412 to open, gas enters the second driving chamber 332, so that the driving piston 320 slides along the first direction of the axial direction of the driving cylinder 330, and the metering piston 220 also slides along the first direction of the axial direction of the metering cylinder 210 (i.e. the left side of fig. 2) under the action of the driving plunger, so that the volume of the storage chamber 130 is reduced.

That is, the solenoid valve 410 controls the first air delivery port 411 and the second air delivery port 412 to alternately ventilate, so that the volume of the storage chamber 130 can be alternately changed to realize the delivery of the material.

The adjusting screw 420 is extended into the second driving chamber 332 by screwing, so that the sliding stroke of the driving piston 320 in the driving cylinder 330 can be adjusted.

When the adjusting screw 420 rotates positively, the adjusting screw 420 moves along the first axial direction of the driving cylinder 330, the first end of the adjusting screw 420 can abut against the driving piston 320, so that the sliding travel of the driving piston 320 in the driving cylinder 330 is shortened, and the sliding travel of the metering piston 220 in the metering cylinder 210 is shortened by the action of the driving member 310 (driving plunger), so that the maximum volume of the storage cavity 130 is reduced, that is, the rated metering value of the pneumatic metering pump is reduced.

When the adjusting screw 420 is reversed, the adjusting screw 420 moves along the second axial direction of the driving cylinder 330, and the first end of the adjusting screw 420 may abut against the driving piston 320, so that the sliding travel of the driving piston 320 in the driving cylinder 330 is prolonged, and the sliding travel of the metering piston 220 in the metering cylinder 210 is prolonged by the action of the driving member 310 (driving plunger), so that the maximum volume of the storage chamber 130, that is, the rated metering value of the pneumatic metering pump is increased.

That is, the sliding stroke of the driving piston 320 in the driving cylinder 330 can be adjusted by the rotation operation of the adjusting screw 420, and the moving stroke of the driving member 310 can also be adjusted, so that the sliding stroke of the metering piston 220 in the metering cylinder 210 can be adjusted, so as to realize the adjustment of the rated metering value of the pneumatic metering pump.

It can be appreciated that the pneumatic metering pump according to the embodiment of the present utility model controls the reciprocating sliding motion of the driving piston 320 in the driving cylinder 330 by providing the solenoid valve 410 having the first air delivery port 411 and the second air delivery port 412, uses the driving member 310 to connect the driving piston 320 and the metering piston 220 respectively to control the reciprocating sliding motion of the metering piston 220 in the metering cylinder 210, and simultaneously uses the adjusting screw 420 to extend into the second driving chamber 332 in a spiral connection manner to adjust the sliding stroke of the driving piston 320 in the driving cylinder 330, under the connection of the driving member 310, the sliding stroke of the metering piston 220 in the metering cylinder 210 can be adjusted by the adjusting screw 420, and the solenoid valve 410 alternately ventilates the first air delivery port 411 and the second air delivery port 412 and the spiral adjustment of the adjusting screw 420, so that the movement of the metering piston 220 can be controlled more easily, without more control components, the movement of the metering piston 220 can be controlled to realize the adjustment of the metering valve, the structure can be simplified, the manufacturing cost can be reduced, and the precision of the pneumatic metering pump can be improved by alternately controlling the movement of the metering piston 220 with high precision.

Referring to fig. 3-5, in some embodiments of the utility model, the control mechanism 400 further includes a gas exchange valve 430.

The scavenging valve 430 is disposed on the driving cylinder 330, the scavenging valve 430 extends into the first driving chamber 331, and the scavenging valve 430 communicates with the solenoid valve 410.

When the driving piston 320 slides along the first axial direction of the driving cylinder 330 (i.e., the left side in fig. 2) and the driving piston 320 slides to the bottom of the first driving chamber 331 of the driving cylinder 330, the driving piston 320 abuts against the ventilation valve 430, and the first gas delivery port 411 of the electromagnetic valve 410 outputs gas, so that the gas flows into the first driving chamber 331 and can drive the driving piston 320 to slide toward the second driving chamber 332 (i.e., slide toward the second axial direction of the driving cylinder 330).

When the driving piston 320 is in contact with the adjusting screw 420, the driving piston 320 is separated from the air exchange valve 430, and the second air outlet 412 of the electromagnetic valve 410 outputs air, which flows into the second driving chamber 332, so as to drive the driving piston 320 to slide toward the first driving chamber 331 (i.e., slide toward the first direction of the axial direction of the driving cylinder 330).

In this embodiment, the air exchange valve 430 is disposed in the first driving cavity 331 of the pneumatic metering pump, so that the sliding position of the driving piston 320 in the driving cylinder 330 can be fed back to the electromagnetic valve 410, so that the electromagnetic valve 410 can more accurately adjust the alternate air delivery condition of the first air delivery port 411 and the second air delivery port 412, and the movement accuracy of the driving piston 320 can be improved, and further the movement accuracy of the metering piston 220 can be improved, so that the metering accuracy of the pneumatic metering pump can be further improved.

Referring to fig. 4 and 5 in particular, in some embodiments of the utility model, the ventilation valve 430 includes a resilient member 431, a ventilation valve spool 432, and a ventilation valve spool seat 433.

The elastic member 431 is provided in the ventilation valve seat 433, and the elastic member 431 is respectively abutted against the ventilation valve seat 433 and the ventilation valve 432, so that the ventilation valve 432 is telescopically connected with the ventilation valve seat 433.

The ventilation valve core seat 433 is arranged on the driving cylinder 330, and the ventilation valve core 432 extends into the first driving cavity 331.

When the drive piston 320 abuts against the ventilation valve 432, the gas in the first drive chamber 331 is introduced into the solenoid valve 410 through the ventilation valve 432, and the first gas transfer port 411 of the solenoid valve 410 is opened.

When the driving piston 320 is separated from the ventilation valve core 432, the gas in the first driving chamber 331 is disconnected from the solenoid valve 410, so that the second gas transfer port 412 of the solenoid valve 410 is opened.

The elastic member 431 may be a ventilation spring, the ventilation spring is disposed in the ventilation valve seat 433, a first end of the ventilation valve 432 extends into the ventilation valve seat 433 to be in abutment with the ventilation spring, a second end of the ventilation valve 432 extends into the first driving cavity 331, and the ventilation valve seat 433 may be further connected to the feedback connector 413 of the electromagnetic valve 410 through the driving cylinder 330 disposed in the ventilation channel and the ventilation connector 333. In this way, the structure of the scavenging valve 430 is made simpler, further reducing the manufacturing costs of the pneumatic metering pump.

In some embodiments of the utility model, in conjunction with fig. 1, the control mechanism 400 further includes a first throttle 440 and a second throttle 450.

The first throttle 440 is disposed between the first transfer port 411 and the first driving chamber 331 and the second throttle 450 is disposed between the second transfer port 412 and the second driving chamber 332.

The first throttle valve 440 can control the flow rate of the gas entering the first driving cavity 331, the second throttle valve 450 can control the flow rate of the gas entering the second driving cavity 332, so as to control the sliding speed of the driving piston 320, and further control the sliding speed of the metering piston 220, so that the rated metering value of the pneumatic metering pump can be conveniently adjusted, and the operation is simple and convenient only by adjusting the corresponding throttle valve.

Further, in order to visualize the adjustment of the metering value of the pneumatic metering pump, the adjustment is made easier and more convenient, and in some embodiments of the present utility model, the portion of the adjusting screw 420 extending outside is provided with a scale, and the metering value can be determined by reading the scale on the adjusting screw 420 when the adjusting screw 420 is rotated to adjust the pneumatic metering pump.

In order to make the metering piston 220 more smooth to slide within the metering cylinder 210, in conjunction with fig. 2, to increase the accuracy of the pneumatic metering pump, in some embodiments of the present utility model, the metering mechanism 200 further includes a metering inner cylinder 230. The metering cylinder 230 is disposed within the metering cylinder 210, and the metering piston 220 is slidably coupled to the metering cylinder 230.

Of course, the driving mechanism 300 further includes a driving inner cylinder 340, the driving inner cylinder 340 is disposed in the driving cylinder 330, and the driving piston 320 is slidably connected to the driving inner cylinder 340.

Further, in order to improve the sealability between the metering piston 220 and the metering inner cylinder 230 and between the driving piston 320 and the driving inner cylinder 340, the movements of the driving piston 320 and the metering piston 220 are further made more accurate, thereby improving the accuracy of the pneumatic metering pump. In this embodiment, the pneumatic metering pump further comprises a first seal ring 500 and a second seal ring 600.

The first seal ring 500 is disposed between the metering piston 220 and the metering cylinder 230, and the second seal ring 600 is disposed between the drive piston 320 and the drive cylinder 340.

The first seal ring 500 and the second seal ring 600 may be O-rings. Of course, an O-ring may be disposed at the contact of other components with the cylinder, for example, an O-ring may be disposed at the screw connection of the adjusting screw 420 and the driving cylinder 330, so as to prevent the sliding movement of the driving piston 320 due to the leakage of the gas in the second driving chamber 332.

In order to reduce the noise of the pneumatic metering pump, in some embodiments of the present utility model, the pneumatic metering pump further includes a first muffler 700, a second muffler 710, and a third muffler 720.

The first muffler 700 communicates with the first transfer port 411, the second muffler 710 communicates with the second transfer port 412, and the third muffler 720 communicates with the ventilation valve 430.

Further, in order to facilitate the operator to know the movement state of the metering piston 220 at any time, in some embodiments of the present utility model, a viewing window 211 is further provided on the metering cylinder 210. The viewing window 211 is located between the metering piston 220 and the driver 310.

In some embodiments of the utility model, referring to fig. 2, control mechanism 400 further includes a first lock cylinder 460. The first lock cylinder 460 abuts the adjustment screw 420 through a screw connection through the drive cylinder 330. When the adjustment of the adjusting screw 420 is completed, the first locking post 460 can lock the position of the adjusting screw 420, so that the adjusting screw 420 is prevented from loosening in the axial direction of the adjusting screw 420 to affect the rated metering value of the pneumatic metering pump under the impact of the driving piston 320, and the accuracy of the pneumatic metering pump is further ensured.

The adjusting screw 420 further includes an adjusting nut 421, the adjusting nut 421 is fixed on the driving cylinder 330, and the adjusting screw 420 is in screw connection with the adjusting nut 421.

In this specification, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, reference to the terms "preferred embodiment," "further embodiment," "some embodiments," "other embodiments," or "specific examples" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A pneumatic metering pump, comprising:

2. The pneumatic metering pump of claim 1 wherein the control mechanism further comprises a gas exchange valve,

3. The pneumatic metering pump of claim 2, wherein the air exchange valve comprises an elastomeric member, an air exchange valve cartridge, and an air exchange valve cartridge seat;

4. The pneumatic metering pump of claim 1 wherein the control mechanism further comprises a first throttle valve and a second throttle valve,

5. Pneumatic metering pump according to claim 1, characterized in that the part of the adjusting screw extending outside is provided with graduations.

6. The pneumatic metering pump of claim 1, wherein the metering mechanism further comprises a metering internal cylinder disposed within the metering cylinder, the metering piston being slidably coupled to the metering internal cylinder;

7. The pneumatic metering pump of claim 6, further comprising a first seal ring and a second seal ring,

8. The pneumatic metering pump of claim 2, further comprising a first muffler, a second muffler, and a third muffler,

9. Pneumatic metering pump according to any of claims 1 to 8, wherein the metering cylinder is provided with a viewing window, the viewing window being located between the metering piston and the drive member.

10. The pneumatic metering pump of claim 9, wherein the control mechanism further comprises a first lock post that abuts the adjustment screw through a threaded connection through the drive cylinder.