KR100769176B1 - Valve assembly for diaphragm pump - Google Patents

Abstract

The present invention relates to an air switching valve for a diaphragm pump that can be restarted in any case in the event of a malfunction. To this end, the present invention forms a predetermined air flow space therein, the valve body having an inlet for the external pressurized air is introduced and the discharge port is connected to the inside of the pump individually; A spool which forms an internal air flow path from the inlet to the outlet in the valve body; And it is provided on the valve body, and provides a diaphragm pump air switching valve, characterized in that consisting of a reset structure to manually and automatically readjust the position of the spool in the event of a malfunction.

Diaphragm Pump, Switching Valve, Reset Structure

Description

Valve for air diaphragm pump {VALVE ASSEMBLY FOR DIAPHRAGM PUMP}

1 is a perspective view showing a general diaphragm pump.

2 is a cross-sectional view showing an air switching valve for a diaphragm pump according to the present invention.

3A and 3B are sectional views showing the automatic operation of the air switching valve according to the present invention.

4A and 4B are sectional views showing the manual operation of the air switching valve according to the present invention.

Description of the main parts of the drawing

100: air switching valve 110: body

111: suction port 112,113: upper / lower discharge port

120: spool 121: central axis

122a, 122b, 122c: Flange 140: Reset structure

141: case 141a: inlet

141b, 141c: upper and lower through holes 142: button

141a: first protrusion 141b: second protrusion

141c: stopper 141d: elastic member                 

143: sealing member

The present invention relates to a diaphragm pump, and more particularly, to an air switching valve for supplying an internal compressed air while alternately changing the direction of the inside of the diaphragm pump.

In general, a diaphragm pump is a device that generates pressure by the movement of an internal diaphragm to transport a target liquid or gas. The diaphragm pump has a relatively low head, but can transport the pump working fluid such as hydraulic oil or compressed air without mixing with the fluid to be transported. Such a diaphragm pump is shown in FIG. 1 and briefly described with reference to the following.

The illustrated diaphragm pump 10 is pneumatic and transfer chambers 12a and 12b outside on the basis of two left and right diaphragms 11a and 11b and the diaphragms 11a and 11b which are internally connected by a center rod (not shown). ), And has a main body consisting of inner air chambers 13a and 13b. In addition, the diaphragm pump 10 includes a suction transfer pipe 15 and a discharge transfer pipe 17 connected to the transfer chambers 12a and 12b, respectively, and the suction and discharge transfer pipes 15 and 17 include: The suction port 14 and the discharge port 16 are formed, respectively. In addition, the diaphragm pump 10 body is equipped with an air switching valve 18 for controlling the compressed air to be alternately supplied to the right and left air chambers (13a, 13b).                         

The diaphragm pump 10 moves the left and right two diaphragms 11a and 11b horizontally to pressurize the liquid, which will be described in more detail as follows. When the compressed air is sent to the air chamber 13a on the right side by the switching valve 18 during operation, the diaphragms 11a and 11b connected to each other are horizontally moved to the right side. Accordingly, the liquid in the right transfer chamber 12a is extruded into the discharge transfer tube 17 and at the same time, the liquid is sucked from the suction transfer tube 15 into the left transfer chamber 12b. On the other hand, the switching valve 18 supplies compressed air to the left air chamber 13b at the next moment, and the diaphragms 11a and 11b move to the left to extrude the liquid in the left transfer chamber 12b. The liquid is sucked into the right transfer chamber 12a. As a result, by the reciprocating motion of the diaphragms (11a, 11b) the liquid from the suction port 14 through the suction conveying pipe 15, the right or left conveying chamber (12a, 12b) and the discharge conveying pipe (17) Finally, it is continuously conveyed from the discharge port 16.

However, as described above, since the operation of the diaphragm pump 10 depends entirely on the compressed air switching of the switching valve 18, there is a problem that the operation is completely stopped when the switching valve 18 malfunctions. In general, the malfunction of the switching valve 18 is mainly caused by the stop of the spool reciprocating in the middle, and to solve this problem, a method of repositioning the spool has been conventionally used automatically or automatically.

However, in the case of the manual method, the readjustment of the spool is certainly guaranteed, but it takes a lot of time until the reset because the operator has to recognize the action. On the other hand, in the case of the automatic method, the action can be taken as soon as a problem occurs in the operation of the pump, but it is not possible to check whether the spool is readjusted. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the present invention provides an air switching valve for a diaphragm pump which can effectively readjust the inner spool in any case during malfunction.

In order to achieve the above object, the present invention forms a predetermined air flow space therein, the valve body having an inlet and a discharge port that is connected to the inside of the pump and the pressurized air outside; A spool which forms an internal air flow path from the inlet to the outlet in the valve body; And it is provided on the valve body, and provides a diaphragm pump air switching valve, characterized in that consisting of a reset structure to manually and automatically readjust the position of the spool in the event of a malfunction.

More specifically, the manual / automatic reset structure may include a case forming a predetermined internal space and including a suction port through which external air is introduced; And a button in the form of a straight bar installed inside the case and protruding into the body by a predetermined external operating force to move the spool.

The button may include a first protrusion protruding into the body when the air pressure is applied; A second protrusion extending to face the first protrusion and at least partially protruding out of the case; And a stopper to which the air pressure is applied to define the protruding length of the second protrusion.

The manual / automatic reset structure may include a pressure sensing unit configured to detect an abnormal pressure state of the pump due to a malfunction of the valve; And an auxiliary air supply unit which supplies compressed air to the inside of the case through the suction port in cooperation with the pressure sensing unit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention in which the above objects can be specifically realized are described with reference to the accompanying drawings. In describing the present embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted below.

2 is a cross-sectional view showing an air switching valve for a diaphragm pump according to the present invention will be described in detail with reference to this structure of the air switching valve.

The air switching valve 100 is composed of a body 110 and a spool 120 located inside the body as a whole, forming a predetermined air flow space therein. In addition, the air switching valve 100 of the present invention further includes a reset structure 140 installed in the body 110 to manually and automatically reposition the spool 120 when the valve 100 malfunctions.

First, the body 110 includes an inlet 111 formed at one side and upper / lower outlets 112 and 113 formed to substantially face the inlet 111. The suction port 111 introduces compressed air for operating a diaphragm pump, and the upper and lower discharge ports 112 and 113 are separately connected to the right and left air chambers 13a and 13b for discharge of the introduced compressed air.

The spool 120 includes a central axis 121 as a whole and a plurality of flanges 122 protruding radially from the central axis 121. The flange 122 actually includes the upper, middle and lower flanges 122a, 122b, 122c in the present invention. And two compressed air passages are formed between adjacent flanges, that is, between the upper and middle flanges 122a and 122b and between the middle and lower flanges 122b and 122c. That is, the spool 120 forms two different internal air flow paths extending from the intake port 111 to the upper or lower discharge ports 112 and 113 through the respective compressed air passages during the reciprocating motion as indicated by the dotted line and the solid line. do. Therefore, the compressed air introduced through the suction port 111 may be alternately discharged to the upper or lower discharge ports 112 and 113.

In the configuration of the present invention, the body 110 and the spool 120 and the like are the same as the general air switching valve, so a detailed description thereof will be omitted, and the reset structure 140 will be described in detail as follows.

The reset structure 140 is composed of a case 141 located on the upper portion of the body 110 and forming a predetermined internal space and a button 142 installed inside the case 141, as shown.

The case 141 is formed on the side similar to the body 110 described above and includes an inlet 141a for introducing external compressed air and a separate auxiliary air supply unit for supplying compressed air to the inlet 141a. (Not shown) is connected. In addition, upper and lower through holes 141b and 141c are formed at upper and lower portions of the case 141, respectively, and the buttons 142 are inserted to be operated up and down through the through holes 141b and 141c. In addition, a predetermined sealing member 143 such as, for example, an O-ring is interposed between the upper through hole 141b and the button 142 inserted therein, and thus the final compressed air from the case 141. Prevent leakage.

The button 142 is a member of a substantially straight bar shape as shown in the drawing, and is generally inserted into the first protrusion 142a and the upper through hole 141b inserted into the lower through hole 141c. And a stopper 142c formed between the second protrusion 142b and the first and second protrusions 142a and 142b. In addition, the button 142 also includes an elastic member 142d into which the first protrusion 142a is inserted to be interposed between the stopper 142c and the lower surface of the case 141.

More specifically, the first protrusion 142a protrudes from the lower through hole 141c into the body 110 only when the button 142 is operated, i.e., moves downward. The second protrusion 142b extends to face the first protrusion 142a and at least a part of the second protrusion 142b protrudes out of the case 141 through the upper through hole 141b. That is, when the button 142 moves downward, the protruding length is changed, but the second protruding portion 142b maintains the protruding state of the case 141. In addition, the stopper 142c primarily defines the protruding length of the first protrusion 142a during operation together with the lower surface of the case 141 and the elastic member 142d. 2 allows a constant outward projection of the projection 142b. In addition, the stopper 142c forms a pressure action surface such that the compressed air introduced from the suction port 141a can apply a predetermined force to the button 142 itself. The elastic member 142d serves to restore the button 142 to its original state when the external manipulation force is removed.

On the other hand, the reset structure 140 preferably includes a pressure sensing unit (not shown) for detecting an abnormal pressure state of the pump due to the malfunction of the valve 100. Accordingly, the auxiliary air supply unit may supply compressed air to operate the button 142 through the inlet 141a automatically when the auxiliary air supply unit is interlocked with the pressure sensing unit.

The operation of the air switching valve of the present invention having such a configuration will be described next with reference to Figs. 3A to 4B.

3A and 3B are sectional views showing the automatic operation of the reset structure according to the present invention, and FIGS. 4A and 4B are sectional views showing the manual operation of the reset structure according to the present invention.

As shown in FIG. 3A, when the air switching valve 100 malfunctions, that is, when the movement of the spool 120 is stopped, the suction port 111 is actually closed and the vertical movement of the spool 120 is simultaneously performed. There is no internal airflow path that depends on. Therefore, the discharge of the compressed air through the upper and lower discharge ports 112 and 113 becomes impossible and consequently the operation of the pump is stopped.

In this case, the automatic operation of the reset structure 140 is first started in the present invention. That is, when a malfunction of the pump described above occurs, the pressure sensing unit (not shown) detects an abnormal state of pressure accompanying the malfunction, and at the same time, the auxiliary air supply unit (not shown) through a predetermined control device. No) is activated. Thereafter, as shown in FIG. 3B, the compressed air introduced from the auxiliary air supply unit through the inlet 141a exerts pressure on the stopper 142c to cause the entire button 142 to move downward. At this time, the first protrusion 142a is guided by the lower through hole 141c to protrude toward the outside of the case 141, that is, toward the spool 120, thereby pushing the spool 120 to the position of the spool 120. Reset it. At the same time, the second protrusion 142b moves downward so that the automatic operation of the reset structure 140 of the present invention can be recognized from the outside.

Accordingly, the inlet 111 is opened to form an internal flow path leading to the outlet 112 between the flanges 122a and 122b of the spool, through which compressed air can be supplied into the pump. And once this normal air supply is performed, the reciprocating motion of the spool 120 is made by the back pressure, etc. from the pump, the pump continues to operate smoothly.

On the other hand, as shown in Figure 4a when the operation of the auxiliary air supply failure occurs, the supply of compressed air through the inlet 141a is not made, the automatic operation of the reset structure 140 is impossible. However, in the present invention, such an automatic inoperable state is understood through the movement of the second protrusion 142b, and the position adjustment of the appropriate spool 120 may be manually performed. That is, if the second protrusion 142b does not move downward even though the pump 10 stops operating, the operator recognizes this as an inoperable state of automatic operation and applies a force directly to the second protrusion 142b. do. Accordingly, as the button 142 moves downward, the position of the spool 120 is reset by the first protrusion 142a which protrudes out of the case 141.

Although only a few embodiments have been described herein above, it will be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit and scope thereof. Therefore, the above-described embodiments are to be considered as illustrative and not restrictive, and thus, the invention is not limited to the above detailed description, but may vary within the scope of the appended claims and their equivalents.

Referring to the effect of the air switching valve for a diaphragm pump according to the present invention described above are as follows.

In the reset structure of the air switching valve of the present invention, when a malfunction occurs, the pump operation can be quickly restored by automatically resetting the position of the spool in association with the auxiliary air supply unit and the pressure sensing unit. In addition, it is possible to check whether the reset structure is operated by the second protrusion, and accordingly, the position of the spool is manually pressed by pressing the second protrusion by the external operator even in the event of failure of the automatic actuator such as the auxiliary air supply unit and the pressure sensing unit. Can be reset.

Therefore, by the basic automatic operation and the manual operation to assist it, the air switching valve of the present invention can efficiently reset the spool and thereby restart the pump in any case, and consequently greatly improve the stability of the pump operation. .

Claims (4)

A valve body having a predetermined air flow space therein and having a first inlet port through which external pressurized air is introduced and a discharge port individually connected to the inside of the pump; A spool forming an internal air flow path from the first inlet to the outlet in the valve body; And The diaphragm pump air switching valve is installed in the valve body, and made of a reset structure for manually and automatically readjusting the position of the spool in case of malfunction. The method of claim 1, The manual / auto reset structure is: A case including a second suction port through which external air is introduced, forming a predetermined inner space; And Is installed inside the case, the air switching valve for a diaphragm pump comprising a straight bar-shaped button protruding into the body by a predetermined external operating force to move the spool. The method of claim 2, The button above: A first protrusion protruding into the body when the air pressure is applied; A second protrusion extending to face the first protrusion and at least partially protruding out of the case; And a stopper to which the air pressure is applied to define the protruding length of the second protrusion. The method of claim 2, The manual / auto reset structure is: A pressure sensing unit for detecting an abnormal pressure state of the pump due to a malfunction of the valve; And And an auxiliary air supply unit for supplying compressed air into the case through the second suction port in cooperation with the pressure sensing unit.

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