CA2280402C - Diaphragm pump - Google Patents
Diaphragm pump Download PDFInfo
- Publication number
- CA2280402C CA2280402C CA 2280402 CA2280402A CA2280402C CA 2280402 C CA2280402 C CA 2280402C CA 2280402 CA2280402 CA 2280402 CA 2280402 A CA2280402 A CA 2280402A CA 2280402 C CA2280402 C CA 2280402C
- Authority
- CA
- Canada
- Prior art keywords
- pump
- pump chamber
- discharge
- chamber
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Reciprocating Pumps (AREA)
Abstract
A diaphragm pump having a simple structure for effectively preventing pulsation of liquid is disclosed. The pump includes a body, a dividing wall for dividing the body into a first pump chamber and a second pump chamber, a partitioning plate in the second pump chamber defining a constant pressure chamber for retaining a volume of air under pressure, and the constant pressure chamber having an opening in a lower portion thereof. The pump further includes a diaphragm mounted in the first pump chamber. There is also provided an inlet in fluid communication with the first pump chamber, the inlet having a inlet valve, a discharge path connecting the first pump chamber to the second pump chamber, the discharge path having a discharge valve, and an outlet in fluid communication with the discharge path. A channel connects the discharge path to the opening in the constant pressure chamber, between the discharge valve and the outlet.
Description
TITLE OF THE INVENTION
DIAPHRAGM PUMP
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a diaphragm pump, and more particularly, relates to a diaphragm pump for effectively preventing pulsation of liquid by providing a first pump chamber for installing a diaphragm and a second pump chamber for arranging a cylindrical partitioning plate having an opening area at a lower portion.
Background of the Related Art Generally, a typical diaphragm pump pumps liquid by translating rotational movement of a motor into a reciprocating, movement by a device such as a cam. Since the amount of the discharged liquid from the diaphragm pump fluctuates by small amounts of volume, the diaphragm pump is generally used for precisely instilling liquid chemicals or medicines.
Fig. lA to lE are cross sectional views illustrating one embodiment of a conventional diaphragm pump. As shown in Fig.
lA, a diaphragm 110 is supported by a supporting ring 120 to form a pump chamber 130 in an open end of a pump head 100. A
suction hole 105 and a discharge hole 106 are located at the upper portion and the lower portion of a body 102, respectively.
The suction hole 105 and the discharge hole 106 are opened/closed by a check ball 140. Referring to Fig. 1C, an opening-side valve seat 141 having a cross-shaped groove is formed on a suction end of the suction hole 105 of the pump head 100 and an end of a discharge-side connector 160. A
closing-side valve seat 142 having tapered shape is formed at an end of a suction connector 150 and a discharge side of the discharge hole 106 of the pump head 100.
The following describes the operation of the diaphragm pump constructed in such a manner as mentioned above.
When a motor (not illustrated) is driven to operate the pump, the rotational movement of the motor is translated into the reciprocating movement of a diaphragm shaft 111 by a device such as an eccentric cam, and thereby the diaphragm 110 is driven back and forth. Fig. lA illustrates a state of the diaphragm being driven back, that is, a suction process, and Fig. 1B illustrates a state of the diaphragm being driven forward, that is, a discharge process.
During the suction process, due to internal pressure, each check ball 140 of the suction side and the discharge side moves toward the center of the pump head 100. Subsequently, since the opening-side valve seat 141 is formed at the end of the suction hole 105 of the pump head 100, liquid is drawn to the pump chamber through the cross-shaped groove. Further, the discharge hole 106 is closed by the check ball 140 during the suction process. On the other hand, during the discharge process, each check ball 140 moves away from the pump head 100 to the outside such that the suction hole 105 is closed by the check ball 140 and only the discharge hole 106 is opened.
Subsequently, the liquid in the pump chamber 130 is discharged through the cross-shaped groove formed at the discharge-side connector 160.
The advantage of such a conventional diaphragm pump in the long term is that the average amount of the discharged liquid is very constant. However, since the pumping operation is separated into the suction process and the discharge process, and it is intermittently performed, there results a fundamental problem of a pulsation of the discharged liquid, as shown in Fig. 1D.
Tn order to prevent such a pulsation of the discharged liquid, two or more pumps are connected in parallel and operated in different strokes, as shown in Fig. lE. Referring to Fig. 2, another method is explained. By installing an air chamber 200 at the center of a liquid pipe passage, during the discharge process, the air in the air chamber 200 is pressurized, and thereby the amount of the discharging liquid from a discharge pipe 210 is reduced. During the suction process, due to the expansion force of the pressurized air, the liquid stored in the air chamber 200 during the discharge process is discharged through the discharge pipe 210.
DIAPHRAGM PUMP
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a diaphragm pump, and more particularly, relates to a diaphragm pump for effectively preventing pulsation of liquid by providing a first pump chamber for installing a diaphragm and a second pump chamber for arranging a cylindrical partitioning plate having an opening area at a lower portion.
Background of the Related Art Generally, a typical diaphragm pump pumps liquid by translating rotational movement of a motor into a reciprocating, movement by a device such as a cam. Since the amount of the discharged liquid from the diaphragm pump fluctuates by small amounts of volume, the diaphragm pump is generally used for precisely instilling liquid chemicals or medicines.
Fig. lA to lE are cross sectional views illustrating one embodiment of a conventional diaphragm pump. As shown in Fig.
lA, a diaphragm 110 is supported by a supporting ring 120 to form a pump chamber 130 in an open end of a pump head 100. A
suction hole 105 and a discharge hole 106 are located at the upper portion and the lower portion of a body 102, respectively.
The suction hole 105 and the discharge hole 106 are opened/closed by a check ball 140. Referring to Fig. 1C, an opening-side valve seat 141 having a cross-shaped groove is formed on a suction end of the suction hole 105 of the pump head 100 and an end of a discharge-side connector 160. A
closing-side valve seat 142 having tapered shape is formed at an end of a suction connector 150 and a discharge side of the discharge hole 106 of the pump head 100.
The following describes the operation of the diaphragm pump constructed in such a manner as mentioned above.
When a motor (not illustrated) is driven to operate the pump, the rotational movement of the motor is translated into the reciprocating movement of a diaphragm shaft 111 by a device such as an eccentric cam, and thereby the diaphragm 110 is driven back and forth. Fig. lA illustrates a state of the diaphragm being driven back, that is, a suction process, and Fig. 1B illustrates a state of the diaphragm being driven forward, that is, a discharge process.
During the suction process, due to internal pressure, each check ball 140 of the suction side and the discharge side moves toward the center of the pump head 100. Subsequently, since the opening-side valve seat 141 is formed at the end of the suction hole 105 of the pump head 100, liquid is drawn to the pump chamber through the cross-shaped groove. Further, the discharge hole 106 is closed by the check ball 140 during the suction process. On the other hand, during the discharge process, each check ball 140 moves away from the pump head 100 to the outside such that the suction hole 105 is closed by the check ball 140 and only the discharge hole 106 is opened.
Subsequently, the liquid in the pump chamber 130 is discharged through the cross-shaped groove formed at the discharge-side connector 160.
The advantage of such a conventional diaphragm pump in the long term is that the average amount of the discharged liquid is very constant. However, since the pumping operation is separated into the suction process and the discharge process, and it is intermittently performed, there results a fundamental problem of a pulsation of the discharged liquid, as shown in Fig. 1D.
Tn order to prevent such a pulsation of the discharged liquid, two or more pumps are connected in parallel and operated in different strokes, as shown in Fig. lE. Referring to Fig. 2, another method is explained. By installing an air chamber 200 at the center of a liquid pipe passage, during the discharge process, the air in the air chamber 200 is pressurized, and thereby the amount of the discharging liquid from a discharge pipe 210 is reduced. During the suction process, due to the expansion force of the pressurized air, the liquid stored in the air chamber 200 during the discharge process is discharged through the discharge pipe 210.
In Figure 2, numeral 201 designated a pressure gauge.
Reference numeral 220 indicates a safety valve for receiving high-pressured liquid through a return pipe 230. Safety valve 220 opens in the event that the pressure of the liquid surpasses a predetermined pressure value.
However, the benefit of using two or more pumps connected in parallel is significantly offset by the substantial increase in installation cost. Moreover, it is difficult to install the air chamber at the center of the liquid pipe passage. Also, it is unsuitable to establish an air chamber when the connector of the pump or the liquid pipe passage is of the tube type. Furthermore, damage frequently occurs to the connector caused by the vibration of the air chamber when operating the pump. Furthermore, since such a method cannot fundamentally remove the pulsation of the discharged liquid, water hammering caused by the pulsation can be generated and it may destroy pipes, especially at high pressures.
SUI~lARY OF THE INVENTION
Therefore, the present invention attempts to overcome these problems by providing a diaphragm pump having a simple structure for efficiently preventing the pulsation of a discharged liquid.
Reference numeral 220 indicates a safety valve for receiving high-pressured liquid through a return pipe 230. Safety valve 220 opens in the event that the pressure of the liquid surpasses a predetermined pressure value.
However, the benefit of using two or more pumps connected in parallel is significantly offset by the substantial increase in installation cost. Moreover, it is difficult to install the air chamber at the center of the liquid pipe passage. Also, it is unsuitable to establish an air chamber when the connector of the pump or the liquid pipe passage is of the tube type. Furthermore, damage frequently occurs to the connector caused by the vibration of the air chamber when operating the pump. Furthermore, since such a method cannot fundamentally remove the pulsation of the discharged liquid, water hammering caused by the pulsation can be generated and it may destroy pipes, especially at high pressures.
SUI~lARY OF THE INVENTION
Therefore, the present invention attempts to overcome these problems by providing a diaphragm pump having a simple structure for efficiently preventing the pulsation of a discharged liquid.
Accordingly, the present invention provides a diaphragm pump for pumping liquid, the pump comprising:
a body;
a dividing wall for internally dividing said body into a first pump chamber and a second pump chamber;
a diaphragm installed in said first pump chamber;
a driving means for moving said diaphragm back and forth;
a cover plate sealing said second pump chamber;
a partitioning plate in the second pump chamber for forming a constant pressure chamber having pressurized air in an inside portion, wherein the partitioning plate has an opening area on a lower portion;
an inlet in fluid communication with said first pump chamber, said inlet having an inlet valve;
a discharge path for connecting said first pump chamber and said second pump chamber;
a discharge valve for opening/closing said first discharge path;
a discharge outlet formed on said second pump chamber.
In accordance with another aspect of the present invention, the discharge path defines a discharge valve installation hole for the discharge valve. Further, the discharge valve includes a valve body having a hollow interior with an open end and a closed end to house a check ball moveable within the interior, the closed end having a plurality of perforations, a valve seat at the open end of the valve body, and a protrusion extending from the closed end of the valve body engagable by a cap installable into the discharge valve installation hole to retain the valve body in the hole.
In accordance with yet another aspect of the present invention the pump further includes a pressure control channel and a high pressure liquid collecting channel, the pressure control channel being in fluid communication with the constant pressure chamber. There is additionally provided a valve plate which covers both an end of the pressure control channel and an end of the high pressure liquid collecting channel, and a supporter for elastically supporting the valve plate against the ends. If the pressure in the second pump chamber exceeds a predetermined pressure, the supporter is biased to discharge liquid under pressure in the pressure chamber through the pressure control channel and the high pressure liquid collecting channel.
BRIEF DESCRIPTION OF THE DRAWINGS
The advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
a body;
a dividing wall for internally dividing said body into a first pump chamber and a second pump chamber;
a diaphragm installed in said first pump chamber;
a driving means for moving said diaphragm back and forth;
a cover plate sealing said second pump chamber;
a partitioning plate in the second pump chamber for forming a constant pressure chamber having pressurized air in an inside portion, wherein the partitioning plate has an opening area on a lower portion;
an inlet in fluid communication with said first pump chamber, said inlet having an inlet valve;
a discharge path for connecting said first pump chamber and said second pump chamber;
a discharge valve for opening/closing said first discharge path;
a discharge outlet formed on said second pump chamber.
In accordance with another aspect of the present invention, the discharge path defines a discharge valve installation hole for the discharge valve. Further, the discharge valve includes a valve body having a hollow interior with an open end and a closed end to house a check ball moveable within the interior, the closed end having a plurality of perforations, a valve seat at the open end of the valve body, and a protrusion extending from the closed end of the valve body engagable by a cap installable into the discharge valve installation hole to retain the valve body in the hole.
In accordance with yet another aspect of the present invention the pump further includes a pressure control channel and a high pressure liquid collecting channel, the pressure control channel being in fluid communication with the constant pressure chamber. There is additionally provided a valve plate which covers both an end of the pressure control channel and an end of the high pressure liquid collecting channel, and a supporter for elastically supporting the valve plate against the ends. If the pressure in the second pump chamber exceeds a predetermined pressure, the supporter is biased to discharge liquid under pressure in the pressure chamber through the pressure control channel and the high pressure liquid collecting channel.
BRIEF DESCRIPTION OF THE DRAWINGS
The advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Fig. lA and 1B are cross sectional views showing the structure and operation of a conventional diaphragm pump;
Fig. 1C is a plan view of an opening-side valve seat having a cross-shaped groove;
Fig. 1D is a graph showing a pulsation of the amount of discharged liquid of a conventional diaphragm pump of Fig. 1A;
Fig. lE is a graph showing a pulsation of the amount of the discharged liquid in the case of reducing the pulsation effect;
Fig. 2 a schematic view showing an air chamber and a safety valve being installed on a conventional liquid pipe passage;
Fig. 3 is a cross sectional view of a diaphragm pump according to a preferred embodiment of the present invention;
Fig. 4 is a front elevational view of a constant pressure chamber cut from the Line A to A' of Fig. 3;
Fig. 5 is an exploded perspective view of a diaphragm pump according to a preferred embodiment of the present invention;
Fig. 6 is a partially cutaway view showing a discharge-side valve body; and Figs. 7 and 8 are cross sectional views illustrating other embodiments according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The characteristics and advantages of the above-described invention will be more clearly understood via the preferred embodiments shown in the attached drawings.
Figs . 3 through 6 illustrate the structure and operation of a diaphragm pump according to one embodiment of the present invention. Fig. 3 is a cross sectional view, Fig. 4 is a front elevational view of a constant pressure chamber taken by line A to A' of Fig. 3, wherein the constant pressure chamber is formed by a cylindrical partitioning plate having an opening, Fig. 5 is an exploded perspective view of a diaphragm pump and Fig. 6 is a partially cutaway view of a one-way discharge valve body.
Referring to Figure 3, a cylindrical body 11 is divided into right and left portions by a dividing wall 12 to form a first pump chamber 13 and a second pump chamber 14.
A diaphragm 110 is compressively installed over an open end of the first pump chamber 13 by a support ring 120. A
cover plate 15 is connected to an open end of the second pump chamber 14 with a gasket 75 as an intermediary. A cylindrical partitioning plate 21 having an opening 22 in the lower portion is installed in an inner portion of the second pump chamber 14. In pumping operation, air in the second pump chamber 14 is stored under pressure in the cylinder partitioning plate 21, by the flow of liquid through an outside portion of the cylindrical partitioning plate 21. The cylinder partitioning plate 21 thereby defines a constant pressure chamber 23.
An inlet 16 is farmed on a lower portion of the first pump chamber 13. A one-way inlet valve 30, which includes a suction-side valve body 32, a suction-side check ball 33 and a suction-side valve seat 34, is installed on an inside portion of a suction-side connector 31, wherein the suction-side connector 31 is connected to the inlet 16. An outlet 18 is formed on an upper portion of the second pump chamber 14 and connected to a discharge-side connector 51.
A discharge path 17 is formed in the dividing wall 12 for connecting the first pump chamber 13 and the second pump chamber 14 and a discharge valve installation hole 45 is formed intermediate the length of discharge path 17. A one-way discharge valve 40, which includes a discharge-side valve body 42, a discharge-side check ball 43 and a discharge-side valve seat 44, is installed on an inside portion of the discharge valve installation hole 45. Referring to Figure 6, the discharge-side valve body 42 defines a ball guide hole 42c and a perforation 42b. The suction-side valve body 32 is formed similarly with a ball guide hole and a perforating hole.
However, the discharge-side valve body 42 also forms a protrusion 42a on an upper portion. When a cap 41 is inserted into the open end of the discharge valve installation hole 45, the protrusion 42a is pressed by the end surface of the cap 41. Accordingly, the discharge-side valve body 42 is fixed in place within the discharge valve installation hole 45, and the space around the protrusion 42a forms a part of the discharge path 17.
By structuring the one-way discharge valve according to the present invention, the one-way discharge valve is more exactly operated compared to a conventional valve means as shown in Fig. 1C, can prevent the chattering, which occurs with a conventional valve, and has increased durability of the valve seat portion.
In Figures 3 to 5 and 7, 8, the description related to reference numeral: 61 indicates a drain pipe; 62 indicates a drain valve; 71 through 74 designate seals for preventing the leakage of air and liquid; and 76 indicates a bolt for connecting a cover plate, the cylindrical body and the support ring.
The following describes the operation of the diaphragm pump formed as the above-mentioned embodiment.
The state of the constant pressure chamber 23 in operation is shown in Fig. 4. Specifically, the liquid to be pumped is filled in the space between the cylindrical partitioning plate 21 and the cylindrical body 11 and in the lower portion of the constant pressure chamber. The pressurized air filled in the constant pressure chamber 23 is isolated from the external environment by the gasket 75 and the liquid filled in the lower portion, and the amount of the air in the constant pressure chamber 23 is constant.
The state of the diaphragm 110 in forward movement, that is in the discharge process, is shown in Fig. 3. In the discharge process, the discharge-side check ball 43 moves up to open the discharge path 17. Simultaneously, the liquid previously collected in the first pump chamber 13 during a previous suction process is discharged to the inside portion of the second pump chamber 14 via the discharge path 17.
Simultaneously, as the liquid pressure increases on the inside portion of the second pump chamber 14, the air in the constant pressure chamber 23 experiences a greater pressure due to the level of the liquid in the constant pressure chamber rising.
In other words, all of the pumped liquid flowing to the inside portion of the second pump chamber 14 via the discharge path 17 is not discharged through the outlet 18. A certain portion of the pumped liquid creates a rising level of the liquid in the constant pressure chamber 23 and increasing the air pressure, so that sudden change in the amount of liquid being discharged through the outlet 18 is prevented.
On the other hand, during a suction process, the one-way discharge valve 40 is closed to prevent reverse flowing of liquid from the inside portion of the second pump chamber 14 to the first pump chamber 13, and liquid discharged from the first pump chamber 13 to the second pump chamber 14 is stopped. However, due to air pressure in the constant pressure chamber 23 which was pressurized during the previous discharge process, the liquid in the inside portion of the second pump chamber 14 is continuously discharged through the outlet 18 and the discharge-side connector 51, and the liquid level in the constant pressure chamber 23 gradually decreases.
Accordingly, the amount of discharged liquid from the second pump chamber 14 is not decreased rapidly, and it is almost equal to the amount of the liquid discharged during the discharge process of the first pump chamber 13.
Fig. 7 is a sectional view showing another embodiment of the present invention. Referring to Fig. 7, a pressure control channel 81 and a high pressure liquid collecting channel 82 are formed on a cover plate 15, to which the open end of the second pump chamber 14 is connected. A valve plate 83 is installed on an outside surface of the cover plate 15 to cover both an end of the pressure control channel 81 and an end of the high pressure liquid collecting channel 82, wherein the valve plate 83 is elastically supported by a spring 85.
Preferably, the valve plate 83 is made of an elastic material.
The spring 85 is installed on an inside portion of a spring casing 84, wherein the spring casing 84 is connected to one side portion of the cover plate 15 by means of a screw. The valve plate is smoothly operated by installing a push plate 86 between the spring 85 and the valve plate 83. A cap 88 is connected to an end portion of the spring casing 84 for controlling the elasticity of spring 85 by means of a screw. A
spring seat 87 is formed between the cap 88 and the spring 85 for safely receiving the spring.
By structuring the pump in the above-mentioned manner, when the pressure in the second pump chamber 14 exceeds a predetermined pressure, the valve plate 83 is elastically deformed and simultaneously, the spring 85 is compressed.
Accordingly, the liquid under pressure in the second pump chamber 14 is discharged through the pressure control channel 81 and the high pressure liquid collecting channel 82.
Accordingly, as shown in Fig. 2, the pump apparatus of the present invention can control the pressure in the pump and the discharge path below a predetermined pressure without installing an extra safety valve on the discharge path.
Accordingly, the installation of the pump apparatus becomes much easier, thereby reducing installation costs.
Differing from the embodiment of the Fig. 3, Fig. 8 is another embodiment of the present invention. The cylindrical body 11 is divided into a first pump chamber body lla and a second pump chamber body llb. The second pump chamber body llb, the cover plate 15 and the cylindrical partitioning plate 21 are integrally formed in the embodiment of the Fig. 8, and together define the constant pressure chamber. An annular channel 24 provides a path for the flow of liquid between the discharge path and the constant pressure chamber. Liquid may pass into and out of the constant pressure chamber through the opening 22.
If the pump is not made of injection-molded resins but metal such as a stainless steel, the embodiment of Fig. 8 is less expensive than that of Fig. 3 from the point of view of the production process and production costs. Further, the S annular channel 24 can be relatively narrow, and does not have to extend the full length of the constant pressure chamber As described above, the diaphragm pump of the present invention proficiently prevents the pulsation effect of the l0 discharge liquid. Moreover, since there is no need for installing extra parts, such as an air chamber and pipes, the installation of the pump becomes much easier, thereby reducing the installation costs.
15 Furthermore, even if an air chamber is installed to reduce the pulsation of liquid according the conventional method, the liquid is still discharged intermittently from a diaphragm pump. As a result, the conventional diaphragm pump is noisy, and the pipes are frequently damaged due to the 20 water hammer effect. However, since the diaphragm pump of the present invention reduces the pulsation of the liquid with the pump itself before discharging the liquid, the pipes are guarded from such damage, and the level of noise can be reduced.
Even though the present invention has been described in application to a certain type of diaphragm pump for convenience, it should be noted that the present invention can be applied to any other type of diaphragm pump or any other type of pump in which the pulsation of the liquid is occurring by the intermittent suction and discharge.
While the present invention has been described in connection with preferred embodiments, various modification and equivalent arrangements can be made without violating the scope and spirit of the invention.
Fig. 1C is a plan view of an opening-side valve seat having a cross-shaped groove;
Fig. 1D is a graph showing a pulsation of the amount of discharged liquid of a conventional diaphragm pump of Fig. 1A;
Fig. lE is a graph showing a pulsation of the amount of the discharged liquid in the case of reducing the pulsation effect;
Fig. 2 a schematic view showing an air chamber and a safety valve being installed on a conventional liquid pipe passage;
Fig. 3 is a cross sectional view of a diaphragm pump according to a preferred embodiment of the present invention;
Fig. 4 is a front elevational view of a constant pressure chamber cut from the Line A to A' of Fig. 3;
Fig. 5 is an exploded perspective view of a diaphragm pump according to a preferred embodiment of the present invention;
Fig. 6 is a partially cutaway view showing a discharge-side valve body; and Figs. 7 and 8 are cross sectional views illustrating other embodiments according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The characteristics and advantages of the above-described invention will be more clearly understood via the preferred embodiments shown in the attached drawings.
Figs . 3 through 6 illustrate the structure and operation of a diaphragm pump according to one embodiment of the present invention. Fig. 3 is a cross sectional view, Fig. 4 is a front elevational view of a constant pressure chamber taken by line A to A' of Fig. 3, wherein the constant pressure chamber is formed by a cylindrical partitioning plate having an opening, Fig. 5 is an exploded perspective view of a diaphragm pump and Fig. 6 is a partially cutaway view of a one-way discharge valve body.
Referring to Figure 3, a cylindrical body 11 is divided into right and left portions by a dividing wall 12 to form a first pump chamber 13 and a second pump chamber 14.
A diaphragm 110 is compressively installed over an open end of the first pump chamber 13 by a support ring 120. A
cover plate 15 is connected to an open end of the second pump chamber 14 with a gasket 75 as an intermediary. A cylindrical partitioning plate 21 having an opening 22 in the lower portion is installed in an inner portion of the second pump chamber 14. In pumping operation, air in the second pump chamber 14 is stored under pressure in the cylinder partitioning plate 21, by the flow of liquid through an outside portion of the cylindrical partitioning plate 21. The cylinder partitioning plate 21 thereby defines a constant pressure chamber 23.
An inlet 16 is farmed on a lower portion of the first pump chamber 13. A one-way inlet valve 30, which includes a suction-side valve body 32, a suction-side check ball 33 and a suction-side valve seat 34, is installed on an inside portion of a suction-side connector 31, wherein the suction-side connector 31 is connected to the inlet 16. An outlet 18 is formed on an upper portion of the second pump chamber 14 and connected to a discharge-side connector 51.
A discharge path 17 is formed in the dividing wall 12 for connecting the first pump chamber 13 and the second pump chamber 14 and a discharge valve installation hole 45 is formed intermediate the length of discharge path 17. A one-way discharge valve 40, which includes a discharge-side valve body 42, a discharge-side check ball 43 and a discharge-side valve seat 44, is installed on an inside portion of the discharge valve installation hole 45. Referring to Figure 6, the discharge-side valve body 42 defines a ball guide hole 42c and a perforation 42b. The suction-side valve body 32 is formed similarly with a ball guide hole and a perforating hole.
However, the discharge-side valve body 42 also forms a protrusion 42a on an upper portion. When a cap 41 is inserted into the open end of the discharge valve installation hole 45, the protrusion 42a is pressed by the end surface of the cap 41. Accordingly, the discharge-side valve body 42 is fixed in place within the discharge valve installation hole 45, and the space around the protrusion 42a forms a part of the discharge path 17.
By structuring the one-way discharge valve according to the present invention, the one-way discharge valve is more exactly operated compared to a conventional valve means as shown in Fig. 1C, can prevent the chattering, which occurs with a conventional valve, and has increased durability of the valve seat portion.
In Figures 3 to 5 and 7, 8, the description related to reference numeral: 61 indicates a drain pipe; 62 indicates a drain valve; 71 through 74 designate seals for preventing the leakage of air and liquid; and 76 indicates a bolt for connecting a cover plate, the cylindrical body and the support ring.
The following describes the operation of the diaphragm pump formed as the above-mentioned embodiment.
The state of the constant pressure chamber 23 in operation is shown in Fig. 4. Specifically, the liquid to be pumped is filled in the space between the cylindrical partitioning plate 21 and the cylindrical body 11 and in the lower portion of the constant pressure chamber. The pressurized air filled in the constant pressure chamber 23 is isolated from the external environment by the gasket 75 and the liquid filled in the lower portion, and the amount of the air in the constant pressure chamber 23 is constant.
The state of the diaphragm 110 in forward movement, that is in the discharge process, is shown in Fig. 3. In the discharge process, the discharge-side check ball 43 moves up to open the discharge path 17. Simultaneously, the liquid previously collected in the first pump chamber 13 during a previous suction process is discharged to the inside portion of the second pump chamber 14 via the discharge path 17.
Simultaneously, as the liquid pressure increases on the inside portion of the second pump chamber 14, the air in the constant pressure chamber 23 experiences a greater pressure due to the level of the liquid in the constant pressure chamber rising.
In other words, all of the pumped liquid flowing to the inside portion of the second pump chamber 14 via the discharge path 17 is not discharged through the outlet 18. A certain portion of the pumped liquid creates a rising level of the liquid in the constant pressure chamber 23 and increasing the air pressure, so that sudden change in the amount of liquid being discharged through the outlet 18 is prevented.
On the other hand, during a suction process, the one-way discharge valve 40 is closed to prevent reverse flowing of liquid from the inside portion of the second pump chamber 14 to the first pump chamber 13, and liquid discharged from the first pump chamber 13 to the second pump chamber 14 is stopped. However, due to air pressure in the constant pressure chamber 23 which was pressurized during the previous discharge process, the liquid in the inside portion of the second pump chamber 14 is continuously discharged through the outlet 18 and the discharge-side connector 51, and the liquid level in the constant pressure chamber 23 gradually decreases.
Accordingly, the amount of discharged liquid from the second pump chamber 14 is not decreased rapidly, and it is almost equal to the amount of the liquid discharged during the discharge process of the first pump chamber 13.
Fig. 7 is a sectional view showing another embodiment of the present invention. Referring to Fig. 7, a pressure control channel 81 and a high pressure liquid collecting channel 82 are formed on a cover plate 15, to which the open end of the second pump chamber 14 is connected. A valve plate 83 is installed on an outside surface of the cover plate 15 to cover both an end of the pressure control channel 81 and an end of the high pressure liquid collecting channel 82, wherein the valve plate 83 is elastically supported by a spring 85.
Preferably, the valve plate 83 is made of an elastic material.
The spring 85 is installed on an inside portion of a spring casing 84, wherein the spring casing 84 is connected to one side portion of the cover plate 15 by means of a screw. The valve plate is smoothly operated by installing a push plate 86 between the spring 85 and the valve plate 83. A cap 88 is connected to an end portion of the spring casing 84 for controlling the elasticity of spring 85 by means of a screw. A
spring seat 87 is formed between the cap 88 and the spring 85 for safely receiving the spring.
By structuring the pump in the above-mentioned manner, when the pressure in the second pump chamber 14 exceeds a predetermined pressure, the valve plate 83 is elastically deformed and simultaneously, the spring 85 is compressed.
Accordingly, the liquid under pressure in the second pump chamber 14 is discharged through the pressure control channel 81 and the high pressure liquid collecting channel 82.
Accordingly, as shown in Fig. 2, the pump apparatus of the present invention can control the pressure in the pump and the discharge path below a predetermined pressure without installing an extra safety valve on the discharge path.
Accordingly, the installation of the pump apparatus becomes much easier, thereby reducing installation costs.
Differing from the embodiment of the Fig. 3, Fig. 8 is another embodiment of the present invention. The cylindrical body 11 is divided into a first pump chamber body lla and a second pump chamber body llb. The second pump chamber body llb, the cover plate 15 and the cylindrical partitioning plate 21 are integrally formed in the embodiment of the Fig. 8, and together define the constant pressure chamber. An annular channel 24 provides a path for the flow of liquid between the discharge path and the constant pressure chamber. Liquid may pass into and out of the constant pressure chamber through the opening 22.
If the pump is not made of injection-molded resins but metal such as a stainless steel, the embodiment of Fig. 8 is less expensive than that of Fig. 3 from the point of view of the production process and production costs. Further, the S annular channel 24 can be relatively narrow, and does not have to extend the full length of the constant pressure chamber As described above, the diaphragm pump of the present invention proficiently prevents the pulsation effect of the l0 discharge liquid. Moreover, since there is no need for installing extra parts, such as an air chamber and pipes, the installation of the pump becomes much easier, thereby reducing the installation costs.
15 Furthermore, even if an air chamber is installed to reduce the pulsation of liquid according the conventional method, the liquid is still discharged intermittently from a diaphragm pump. As a result, the conventional diaphragm pump is noisy, and the pipes are frequently damaged due to the 20 water hammer effect. However, since the diaphragm pump of the present invention reduces the pulsation of the liquid with the pump itself before discharging the liquid, the pipes are guarded from such damage, and the level of noise can be reduced.
Even though the present invention has been described in application to a certain type of diaphragm pump for convenience, it should be noted that the present invention can be applied to any other type of diaphragm pump or any other type of pump in which the pulsation of the liquid is occurring by the intermittent suction and discharge.
While the present invention has been described in connection with preferred embodiments, various modification and equivalent arrangements can be made without violating the scope and spirit of the invention.
Claims (4)
1. A diaphragm pump for pumping liquid, the pump comprising:
a body;
a dividing wall for internally dividing said body into a first pump chamber and a second pump chamber;
a diaphragm installed in said first pump chamber;
a driving means for moving said diaphragm back and forth;
a cover plate sealing said second pump chamber;
a partitioning plate in the second pump chamber for forming a constant pressure chamber having pressurized air in an inside portion, wherein the partitioning plate has an opening area on a lower portion;
an inlet in fluid communication with said first pump chamber, said inlet having an inlet valve;
a discharge path for connecting said first pump chamber and said second pump chamber;
a discharge valve for opening/closing said first discharge path;
a discharge outlet formed on said second pump chamber.
a body;
a dividing wall for internally dividing said body into a first pump chamber and a second pump chamber;
a diaphragm installed in said first pump chamber;
a driving means for moving said diaphragm back and forth;
a cover plate sealing said second pump chamber;
a partitioning plate in the second pump chamber for forming a constant pressure chamber having pressurized air in an inside portion, wherein the partitioning plate has an opening area on a lower portion;
an inlet in fluid communication with said first pump chamber, said inlet having an inlet valve;
a discharge path for connecting said first pump chamber and said second pump chamber;
a discharge valve for opening/closing said first discharge path;
a discharge outlet formed on said second pump chamber.
2. The diaphragm pump according to claim 1, wherein said discharge path defines a discharge valve installation hole for said discharge valve; and said one-way discharge valve comprises:
a valve body having a hollow interior with an open end and a closed end to house a check ball moveable within said interior, said closed end having a plurality of perforations;
a value seat at said open end of said valve body;
and a protrusion extending from said closed end of the valve body engagable by a cap installable into said discharge valve installation hole to retain said valve body in said hole.
a valve body having a hollow interior with an open end and a closed end to house a check ball moveable within said interior, said closed end having a plurality of perforations;
a value seat at said open end of said valve body;
and a protrusion extending from said closed end of the valve body engagable by a cap installable into said discharge valve installation hole to retain said valve body in said hole.
3. The diaphragm pump according to claim 1 or claim 2, further comprising:
a pressure control channel and a high pressure liquid collecting channel, said pressure control channel being in fluid communication with said constant pressure chamber;
a valve plate which covers both an end of said pressure control channel and an end of said high pressure liquid collecting channel; and a supporter for elastically supporting said valve plate against said ends;
wherein if the pressure in said second pump chamber exceeds a predetermined pressure, said supporter is biased to discharge liquid under pressure in said pressure chamber through said pressure control channel and said high pressurized liquid collecting channel.
a pressure control channel and a high pressure liquid collecting channel, said pressure control channel being in fluid communication with said constant pressure chamber;
a valve plate which covers both an end of said pressure control channel and an end of said high pressure liquid collecting channel; and a supporter for elastically supporting said valve plate against said ends;
wherein if the pressure in said second pump chamber exceeds a predetermined pressure, said supporter is biased to discharge liquid under pressure in said pressure chamber through said pressure control channel and said high pressurized liquid collecting channel.
4. The diaphragm pump according to any one of claims 1 to 3, wherein the body is a cylindrical body and the partitioning plate is a cylindrical partitioning plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR32985/1998 | 1998-08-14 | ||
| KR1019980032985A KR100291161B1 (en) | 1998-08-14 | 1998-08-14 | Diaphragm pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2280402A1 CA2280402A1 (en) | 2000-02-14 |
| CA2280402C true CA2280402C (en) | 2004-10-26 |
Family
ID=30768113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2280402 Expired - Fee Related CA2280402C (en) | 1998-08-14 | 1999-08-13 | Diaphragm pump |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2280402C (en) |
| ID (1) | ID23811A (en) |
| MY (1) | MY120821A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100291161B1 (en) * | 1998-08-14 | 2001-06-01 | 김성철 | Diaphragm pump |
-
1999
- 1999-08-13 MY MYPI9903482 patent/MY120821A/en unknown
- 1999-08-13 CA CA 2280402 patent/CA2280402C/en not_active Expired - Fee Related
- 1999-08-16 ID IDP990788D patent/ID23811A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MY120821A (en) | 2005-11-30 |
| CA2280402A1 (en) | 2000-02-14 |
| ID23811A (en) | 2000-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0816677B1 (en) | Reciprocating pump | |
| US6893229B2 (en) | Vacuum preventing device of scroll compressor | |
| US6227830B1 (en) | Check valve mounted adjacent scroll compressor outlet | |
| US20030206812A1 (en) | Vacuum preventing device for scroll compressor | |
| KR100291161B1 (en) | Diaphragm pump | |
| US7094038B2 (en) | Vacuum preventing device for scroll compressor | |
| US5380175A (en) | Fluid feed pump with valved piston device | |
| US20040047750A1 (en) | Reciprocating compressor | |
| CA2280402C (en) | Diaphragm pump | |
| KR100421965B1 (en) | Cylinder assembly of hermetic compressor | |
| KR0147004B1 (en) | Cylinder of an reciprocating compressor | |
| US20090120508A1 (en) | Air Release Valve | |
| KR100448548B1 (en) | Cylinder assembly and hermetic compressor having the same | |
| KR0130239Y1 (en) | Oil penetration protection structure in the muffler of a hermetic compressor | |
| KR100304573B1 (en) | Structure for preventing oil discharge in rotary compressor | |
| KR100719625B1 (en) | A check valve with floating plate | |
| KR200169201Y1 (en) | Air chamber reducing pulsation of diaphragm pump | |
| KR0129267Y1 (en) | Oil pump using an eccentric cam | |
| KR100308305B1 (en) | Apparatus for preventing gas antiflow of scroll compressor | |
| KR100498321B1 (en) | Protective device for suction valve in reciprocating compressor | |
| KR100311380B1 (en) | Discharge valve assembly | |
| KR100314076B1 (en) | Oil feeder for linear compressor | |
| JPH0730850B2 (en) | Check valve and pumping method using this check valve | |
| KR100202584B1 (en) | Muffler for hermetic compressor | |
| SU1196589A1 (en) | Check valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180813 |