JP4428773B2 - Self-priming centrifugal pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-priming centrifugal pump that is incorporated in a water heater and used for a circulation pump for bathing or the like.
[0002]
[Prior art]
Conventionally, as a small self-priming centrifugal pump, as shown in FIG. 6, an impeller casing 13 is overlapped with a partition plate 12 sandwiched between a splicing end face of a motor housing 10 on the drive magnet disk 11 side, and the impeller casing is further overlapped. 13 has a laminated structure in which the end casing 15 is overlapped with the metal partition plate 14 and the gasket plate 9 and is interconnected with mounting bolts (not shown). A centrifugal type impeller (impeller) 18 incorporating a driven magnet disk 17 is rotatably fitted to the fixed shaft 16 planted on the partition plate 12, and the drive magnet disk 11 and the driven magnet disk 17 are connected to the partition plate. A magnet coupling is configured with 12 interposed therebetween, and the centrifugal impeller 18 is rotationally driven across the partition plate 12 by the rotation of the motor shaft 19 driven by the motor.
[0003]
As shown in FIG. 7A, the impeller casing 13 has a substantially rectangular frame shape having a circular arc portion at the lower portion, and is a disk-shaped cavity portion containing a centrifugal impeller 18 having a plurality of spiral blades 18a and a front shroud 18b. An impeller chamber 20, an oblique guide channel 22 extending from the impeller chamber 20 in the upward tangential direction of the peripheral wall 21, and guiding the centrifugal flow by the impeller 18 obliquely upward from the impeller chamber 20, and the oblique guide channel 22 An air-water separation chamber 23 is provided for separating the air and the water by causing the air-water mixed flow radiated vigorously from the outlet 22b to collide with the upper recoil barrier 21a and splash the water downward.
[0004]
The end casing 15 also has a substantially rectangular frame shape having an arc portion at the lower part so as to match the outer contour of the impeller casing 13, and holds down the suction joint 24 and the discharge joint 25 projecting from the upper left and right, and the boss part of the impeller 18. And a cylindrical boss presser 26 for retaining it, a suction chamber 27 for sucking a suction fluid (water or air) from the suction joint 24, a cylindrical boss presser 26 and an open annular partition wall 28 around it. Then, the suction fluid is guided from the lower portion of the suction chamber 27 to the central portion (blade converging portion) of the centrifugal impeller 18 that is accommodated in the impeller chamber 20 via the circular flow port (first flow port) 14 a of the partition plate 14. And a water reservoir space 30 for storing priming water and supplying priming water to the impeller chamber 20 via the priming water circulation port (fourth circulation port) 14b of the partition plate 14. The discharge chamber 31 for discharging the air separated in the steam / water separation chamber 23 of the impeller casing 13 and the discharge water at the time of pumping to the discharge joint 25 through the upper flow port (second flow port) 14c of the partition plate 14. And have. The partition plate 14 has a return port (third flow port) 14d for returning the separated water separated in the steam / water separation chamber 23 of the impeller casing 13 to the water reservoir space 30 below the end casing 15 from the upper flow port 14c. It is formed at the bottom. Reference numeral 32 denotes a water drain port for draining the priming water so that the priming water in the water reservoir space 30 does not freeze.
[0005]
When the pump is started (self-priming operation), since the impeller 18 is immersed in the priming water of the water storage space 30, the centrifugal flow in which water and air are mixed rebounds upward from the outlet 22a via the oblique guide channel 22. Colliding with the barrier 21a, air is sent out to the discharge joint 25 through the upper circulation port 14c, and the separated water falls in the steam-water separation chamber 23 and returns to the water storage space 30 through the reflux port 14d. By repeating the exhaust of air and the recovery of the priming water due to such air-water separation, the inside of the pipe connected to the suction joint 24 becomes negative pressure. It is pumped from the guide channel 22 to the discharge joint 25 through the upper flow port 14c. In addition, the arrow W in a figure shows the flow of water.
[0006]
By the way, in the impeller casing 13, since the oblique guide flow path 22 is disposed at the upper part with respect to the impeller chamber 20 of the disk-shaped cavity portion located at the lower part, as shown in FIG. The right corner of the guide channel 22 sandwiching the upper partition wall 22a is a bag chamber 33 as a dead space surrounded by the peripheral wall 21. The reason for forming the bag chamber 33 having a hollow is to prevent distortion deformation due to the sink of the resin thickness when the impeller casing 13 is molded, and to flatten the top end face of the partition wall of the peripheral wall 21 and the oblique guide channel 22. This is because the gap between the partition plate 14 and the partition plate 14 is eliminated. A rib (not shown) is formed inside the bag portion chamber 33.
[0007]
[Problems to be solved by the invention]
However, the above self-priming centrifugal pump has the following problems.
[0008]
(1) At the time of pumping operation, since the pressure fluid flows through the oblique guide channel 22, in the waterproof structure in which the partition plate 14 is pressed against the partition wall of the oblique guide channel 22, the upper partition wall extends from the oblique guide channel 22. Water gradually oozes out into the bag portion chamber 33 through a slight gap generated on the mating surface of 22a and the partition plate 14, and the water stays in the cavity of the bag portion chamber 33. For this reason, fine substances such as dirt, dust and bathing agents are likely to accumulate in the bag portion chamber 33.
[0009]
(2) When the pump is not used for a long period of time, the priming water in the water storage space 30 is drained from the water drain port 32, but the water staying in the bag chamber 33 remains collected without falling naturally. . For this reason, at the time of cold, the staying water in the bag part chamber 33 is easily frozen.
[0010]
(3) Water is accumulated in the bag chamber 33 even during the pump water flow inspection, but when it is installed in a water heater or the like, the remaining water in the bag chamber 33 begins to spill out due to impact or the like, and the installation workability is reduced. There is a risk of inviting.
[0011]
By the way, in the waterproof structure in which the partition plates are combined in this way, water inevitably enters the bag room from the oblique guide flow path through the alignment gap during the pumping operation. A sealing material can be applied to the top end face of the upper partition wall of the guide channel, and a watertight structure can be adopted. However, the increase in the number of parts and the assembly work become complicated.
[0012]
Therefore, in view of the above problems, an object of the present invention is to provide a self-priming centrifugal pump having a structure capable of preventing water from staying in the bag chamber when the pump is stopped without causing an increase in the number of parts. It is in.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first means taken by the present invention is to provide a drainage path for the bag chamber.
[0014]
That is, the present invention provides a first case having a suction chamber that communicates with a suction port, and a discharge chamber that communicates with the discharge port and has a water reservoir space in the lower portion, and an impeller chamber that communicates with the suction chamber and houses a centrifugal impeller therein. And an oblique guide channel for guiding the centrifugal flow generated by the centrifugal impeller obliquely upward from the impeller chamber, and a lower partition with respect to the oblique guide channel. A second case having an air-water separation chamber having an upper recoil barrier facing the mouth, and a bag chamber positioned at an upper corner of the oblique guide channel with its upper partition interposed therebetween, and an overlapping A first communication port that communicates between the suction chamber and the impeller chamber, and a second fluid communication between the air / water separation chamber and the discharge chamber at the top. , A third circulation port communicating the steam-water separation chamber and the water reservoir space at the bottom, and a water reservoir space In the self-priming centrifugal pump including a partition plate having a fourth flow port communicating with the impeller chamber, the partition plate has a fifth flow port communicating with the discharge chamber and the bag portion chamber at the upper portion, The second case is characterized by having a first notch communicating the bag portion chamber and the impeller chamber at the lower portion of the upper partition.
[0015]
During the pumping operation, water inevitably enters the bag part chamber from the oblique guide channel through the gap between the upper partition wall and the partition plate, and water accumulates in the bag part chamber through the fifth circulation port. When the pump operation is stopped, the air naturally communicates with the bag portion chamber from the discharge joint through the discharge chamber and the fifth flow port, so that the water accumulated in the bag portion chamber passes through the first notch and the impeller chamber. Since it returns as priming water, it is possible to prevent water from staying in the bag chamber. For this reason, accumulation and freezing of fine objects in the bag part chamber can be prevented, and water leakage does not occur when the pump is assembled, thereby improving workability. Furthermore, since it is only necessary to form the fifth flow port in the partition plate and form the first notch in the second case, the number of parts does not increase, and the cost can be reduced.
[0016]
Here, in the case where the second case has a second notch communicating the oblique guide channel and the bag part chamber at the upper part of the upper partition, only the draining action of the stagnant water in the bag part chamber can be achieved. In addition, the bag chamber itself performs the second air / water separation function. That is, during the self-priming operation, the centrifugal flow of the air-water mixture flows through the oblique guide channel, and this centrifugal flow is radiated from the outlet to the air-water separation chamber having the upper recoil wall, and at the same time, Since the part enters the bag part chamber through the second notch, air bubbles (air) in the air-water mixed flow entering the bag part room are extracted to the discharge joint through the fifth circulation port, and The water of the water mixed flow flows down in the bag part chamber and returns to the impeller chamber as priming water through the first notch. Therefore, although this bag part chamber does not have an outstanding recoil barrier, it corresponds to the second air-water separation chamber by natural separation based on the specific gravity of the water. For this reason, self-priming performance improves.
[0017]
There may be a configuration in which the fifth notch is not formed in the partition plate and the first notch and the second notch are formed in the second case. Although the fifth distribution port for removing the air of the air-water mixed flow that has entered the bag portion chamber is not formed, the air in the bag portion remains as an air reservoir in the upper portion, and only the separated water passes through the first notch. Return to the impeller room. In such a case, the bag chamber corresponds to a return path for the second air-water separation chamber and the priming water that is passive during the self-priming operation, but when the pump operation is stopped, the air is passed through the second notch to the bag chamber. Therefore, the water accumulated in the bag chamber returns to the impeller chamber as priming water through the first notch, so that the bag chamber can be prevented from staying.
[0018]
The second notch is formed, for example, at the outlet side root portion of the upper partition. It is an area that does not belong to the air-water separation chamber with the original upper recoil wall. During the self-priming operation, a part of the air-water mixed flow pumped along the upper partition wall of the oblique guide flow channel enters the bag chamber by passing around the second notch at the outlet side base portion. Since a part of the air-water mixed flow immediately before radiation enters from the outlet, the substantial flow resistance of the oblique guide channel does not need to be increased. According to the experiment, even when the second cutout was formed below the outlet side root portion, almost no change was observed in the self-priming performance and the pumping performance. A plurality of second notches may be discretely formed along the upper partition of the oblique guide channel. Since the interior of the bag portion is full during pumping, the amount of water returning from the bag chamber to the impeller chamber is limited by the drawing resistance due to the first notch, so even when a plurality of second notches are formed, The flow resistance of the oblique guide channel is not so high. Rather, the return speed of priming water increases during self-priming.
[0019]
Second notch Kiha , Upper recoil barrier Be formed along Is appropriate. Since the second notch intersects at an acute angle with the direction of the air-water mixed flow fed along the upper partition and does not face the centrifugal flow component, part of the return flow of the air-water mixed flow along the upper partition Will enter the bag compartment, so the second notch itself will become a local air / water separator, and will perform the air / water separation action that tends to take water into the bag compartment while escaping air bubbles. Will increase.
[0020]
The first cutout is formed, for example, in the base portion of the upper partition wall on the scraper opening side of the impeller chamber. Since the water returned from the bag chamber through the first notch to the vicinity of the scraping opening of the impeller chamber encounters periodic scraping pressure (pulse pressure) due to the circumferential end of the spiral blade of the centrifugal impeller, the blade circle Immediately after the peripheral edge crosses the first cutout, the return water flows into the impeller chamber, hardly returns to the water reservoir space, and is inclined again through the discharge port by the scraping of the subsequent peripheral edge of the blade immediately after flowing in. It is pumped to the direction guide channel. For this reason, a part of the priming water volume forms a circulation system in the vicinity of the impeller chamber scraping outlet → the oblique guide channel → the second notch → the bag portion chamber → the first notch → the vicinity of the impeller chamber scraping port. However, immediately after the circumferential edge of the blade crosses the first notch, the return water is drawn into the vicinity of the raking port, so that the raking port is blocked. It is considered that the pulling-back force of the extruded bubble flow is weakened, the bubble discharging efficiency in the oblique guide channel is increased, and the self-priming performance is improved. As a synchronous water film escapement (non-return) for the bubbly flow in which the return water flow drawn from the first notch to the vicinity of the scraping port every time the blade circumferential edge feeds up the slant guide channel It is thought that it is acting.
[0021]
First cutout Kiha , Formed parallel to the upper recoil barrier . Since the second notch intersects the direction of the centrifugal flow along the upper partition wall at an acute angle and does not face the centrifugal flow component, water must be reliably drained from the bag chamber to the impeller chamber even during self-priming operation. It is possible to improve self-priming performance and reduce draining noise.
[0022]
As apparent from the above, the present invention pays attention to the fact that the bag part chamber is positively used as the second air-water separation chamber, and the present invention lays this out and does not restrict the bag part chamber. The second air / water separation chamber or the guide channel automatic reduction means for supplementing the first air / water separation chamber having the recoil barrier is provided.
[0023]
The original air / water separation chamber (first air / water separation chamber) is configured so that the centrifugal flow (bubble flow) from the impeller chamber collides with the upper recoil barrier via the guide flow path, so that While air bubbles are regenerated by increasing the frequency of air bubble association, air-water separation is performed by the mistake of the water recoil direction and the air rising direction, but it reaches the upper recoil barrier (deflection wall). Static air-water separation can be carried out even with simple specific gravity separation of the bubble flow in the middle of the previous guide path.
[0024]
The air-water separation action during the self-priming operation has the significance of exhausting the air in the pipe and collecting the priming water. However, if the amount of priming water is large, the bubble trapping rate becomes high, so that high self-priming performance is achieved. The impeller stirs the priming water to generate a bubble flow so as to entangle the bubbles and scrapes it out to the oblique guide channel. In the initial stage of self-priming operation, it is necessary to expel the air in the impeller chamber and make it negative pressure. When the amount of priming water is small, a small amount of bubble flow rises along the surface layer of the upper partition wall of the oblique guide channel, but an air layer remains on the side of the lower partition wall and the impeller chamber and the oblique guide channel are released. The opening communicates with the air at a pressure, so that a check valve action against air does not occur in the oblique guide flow path, and negative pressure in the impeller chamber does not occur. Here, when the channel cross-sectional area (flow product) of the oblique guide channel is thin, even if the priming water amount is too small, a small amount of bubble flow generated in the impeller chamber rises in a state where the narrow oblique guide channel is full. For this reason, in the narrow oblique guide channel, the above-described check valve action with respect to the air occurs, and the impeller chamber eventually becomes negative pressure to generate a self-priming action. However, when shifting during the pumping operation, the flow resistance of the oblique guide channel is high and the pumping performance is low. In the self-priming operation, the priming water recoiled by the upper recoil barrier of the first air-water separation chamber returns to the basin space, but since the return loop is long, the substantial priming water remaining in the basin space is reduced, Since the bubble flow is reduced, the check valve action is more difficult to occur.
[0025]
Therefore, the second means of the present invention is to draw the priming water from the upper partition wall of the guide path during the self-priming operation so that the self-priming action can be reliably started without degrading the pumping performance even when the priming water amount is small. By flowing from the vicinity to the upper part along the upper partition wall and refluxing it, the self-priming operation substantially constricts the flow of the guide path for the bubble flow from the impeller chamber, and the check valve action against air To achieve a self-priming action.
[0026]
That is, the present invention rotatably supports a centrifugal impeller immersed in priming water in a water reservoir space, and rotatably supports an impeller chamber that communicates with a suction port, and a guide channel that leads a centrifugal flow from the impeller chamber from the impeller chamber; It has an upper recoil barrier facing the outlet of the guide channel, separates the air / water mixed water radiated from the outlet, returns the separated water to the water storage space and discharges the separated gas to the outlet. In a self-priming centrifugal pump comprising a first air / water separation chamber, a part of the air / water mixed water that flows on the guide channel to the outlet is taken from the upper intake portion to separate the air and water, and the separated water is It has the 2nd air-water separation chamber extracted from the upper partition of a guide channel to the root part by the side of the discharge port in an impeller chamber through a lower drainage part.
[0027]
According to such a configuration, during the self-priming operation, the priming water taken from the upper intake portion returns to the vicinity of the scraping opening of the upper partition wall of the guide path in the impeller chamber via the second steam separation chamber and the lower drainage portion. The returned priming water rises again along the upper partition wall of the guide path. For this reason, the flow volume of the guide path for the bubble flow from the impeller chamber is substantially constricted by the amount of the priming water that flows on the surface of the upper partition wall. A check valve action with respect to air occurs, the impeller chamber becomes negative pressure, and a self-priming action can be started. When the operation is shifted to the pumping operation, the second air / water separation chamber is also filled with water, and the reflux through the second air / water separation chamber is substantially eliminated. Since the priming water circulates between the upper and lower ends of the guide channel and the loop length is the shortest, the amount of priming water to be recirculated is small.
[0028]
The reflux water returning from the second steam-water separation chamber to the impeller chamber forms a bias flow of the guide path. In which part of the guide path, the water film check valve action is manifested. Is interesting. It can be inferred that it is the minimum flow-portion part (constriction part) of the guide path or the scraping port. However, it is considered that the layer thickness of the return flow that rises along the upper partition is not uniform, and it can be generally said that the narrowed portion of the guide path corresponds to the scraping port side. It is considered that the return water flow drawn from the lower drainage portion to the vicinity of the raking port causes a synchronous water film check valve action for the bubble flow rising up the guide channel in the vicinity of the raking port.
[0029]
Further, when the pump operation is stopped, the accumulated water in the second steam separation chamber falls into the impeller chamber, so that the original problem of the present invention can be achieved.
[0030]
In addition, you may form an upper water intake part in the 1st notch in a 1st means, and a lower water drain part in the 2nd notch in a 1st means, respectively, respectively.
[0031]
When the second air / water separation chamber communicates with the discharge chamber via the air vent at the upper part, the air separated in the second air / water separation chamber is removed via the air vent during the self-priming operation. For this reason, the air-water separation action is vigorous, and improvement in self-priming performance can be expected.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings.
[0033]
[First Embodiment]
FIG. 1 (A) is a plan view showing an impeller casing in the self-priming centrifugal pump according to the first embodiment of the present invention, and FIG. 1 (B) is a plan view of the end casing in the self-priming centrifugal pump as seen upside down. FIG. 1C is a plan view of the self-priming centrifugal pump viewed from the inside up, FIG. 2A is an enlarged plan view of the impeller casing, and FIG. 2B is FIG. It is a cross-sectional arrow figure which shows the state cut | disconnected along the AA of A). 1 and 2, the same parts as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and the description thereof is omitted.
[0034]
The self-priming centrifugal pump of this example has the same configuration as the conventional pump shown in FIGS. 6 and 7, but the partition plate 14 includes a round flow port (first flow port) 14a and an upper flow port (first flow port). 2 outlet 14 c, reflux outlet (third outlet) 14 d, and water outlet (fourth outlet) 14 b, and an air outlet (fifth outlet) communicating the discharge chamber 31 and the bag chamber 33 at the upper part. No. 14e). On the other hand, the impeller casing 13 has a first notch 33a that allows the bag portion chamber 33 and the impeller chamber 20 to communicate with each other under the upper partition 22a. The first notch 33a is formed at the root portion of the upper partition wall 22a on the side of the outlet 20a of the impeller chamber 20, and the direction intersects the scraping direction 1 of the centrifugal flow at an acute angle (upper recoil wall). 21a creeping direction). In this example, the notch depth of the first notch 33a is formed to be shallow to about a fraction of the height of the upper partition wall 22a as shown in FIG.
[0035]
Thus, even in the configuration in which the bag chamber 33 has the air vent (fifth flow port) 14e and the first notch 33a, the upper partition 22a and the partition plate 14 are aligned from the oblique guide channel 22 during the pumping operation. Although water may inevitably enter the bag portion chamber 33 through the gap, the water in the discharge chamber 31 fills the bag chamber portion 33 through the air vent (fifth distribution port) 14e. However, when the pump operation is stopped, since air naturally communicates with the bag portion chamber 33 from the discharge joint 25 through the discharge chamber 31 and the air vent (fifth flow port) 14e, the water accumulated in the bag portion 33 is Since it returns to the impeller chamber 20 as priming water through the first notch 33a, the retention of water in the bag portion chamber 33 can be prevented.
[0036]
For this reason, accumulation and freezing of fine objects in the bag portion chamber 33 can be prevented, and water leakage does not occur when the pump is assembled, and workability can be improved. In addition, the air vent (fifth flow port) 14e is punched into the partition plate 14 at the same time as the other flow ports, and the first notch 33a only needs to be formed at the same time when the impeller casing 13 is formed. It is possible to reduce the cost of the pump without increasing the number of points.
[0037]
During the self-priming operation, a small amount of priming water that enters the bag chamber 33 through the air vent (fifth flow port) 14e quickly returns to the impeller chamber 20 through the first notch 33a. Will increase. Since the notch depth of the first notch 33a is made shallower than the height of the upper partition wall 22a, the return does not hit the blade circumferential edge of the impeller 18, so that water draining noise can be suppressed. . In addition, if the notch depth of the 1st notch 33a is made deep and the reflux water which flows in into the impeller chamber 20 from the 1st notch 33a is made to scrape out to the subsequent blade circumferential end, the reflux water will be However, since it functions as a water film check valve at the scraping opening 20a, pulling back of the bubble flow once pushed out to the guide path 22 can be weakened, and the self-priming performance can be improved.
[0038]
[Second Embodiment]
FIG. 3 (A) is a plan view showing an impeller casing in a self-priming centrifugal pump according to a second embodiment of the present invention, and FIG. 3 (B) is a plan view of the end casing in the self-priming centrifugal pump as seen upside down. 3C is a plan view of the self-priming centrifugal pump viewed from the inside up, FIG. 4A is an enlarged plan view of the impeller casing, and FIG. 4B is FIG. It is a cross-sectional arrow figure which shows the state cut | disconnected along the AA of A). 3 and 4, the same reference numerals are given to the same portions as those shown in FIGS. 6 and 7, and the description thereof is omitted.
[0039]
The self-priming centrifugal pump of this example has the same configuration as that of the pump according to the first embodiment shown in FIGS. 1 and 2, except that an air vent (fifth flow port) 14e and a first notch (lower part). In addition to the water drainage portion 33a, the upper partition 22a has a second notch (upper water intake portion) 33b communicating with the oblique guide channel 22 and the bag portion chamber 33. The second notch 33b is formed at the root portion of the upper partition 22a on the side of the outlet 22b, and the direction thereof is a direction along the boundary surface of the upper recoil barrier 21a. In this example, the notch depth of the second notch 33b is shallow to about a fraction of the height of the upper partition wall 22a as shown in FIG. 4B.
[0040]
Thus, when it has the 2nd notch 33b, not only the draining action of the stagnant water of the bag part chamber 33 but the bag part chamber 33 itself exhibits a 2nd air-water separation function. That is, during the self-priming operation, the centrifugal flow of the air / water mixture flows through the oblique guide channel 22, and this centrifugal flow is radiated from the outlet 22b to the air / water separation chamber 23 having the upper recoil wall 21a. At the same time, since a part of the air enters the bag part chamber 33 through the second notch 33b, bubbles (air) in the air-water mixed flow entering the bag part chamber 33 are removed from the air vent (fifth distribution port) 14e. The water in the gas-water mixed flow flows down in the bag chamber 33 and returns to the impeller chamber 20 as priming water through the first notch 33a. Therefore, although this bag part chamber 33 does not have an outstanding recoil barrier, it corresponds to a second air-water separation chamber by natural separation based on the specific gravity of water. For this reason, compared with 1st Embodiment, self-priming performance improves.
[0041]
The second notch 33b is formed at the root portion of the upper partition wall 22a on the outlet 22b side, but according to experiments, the second notch 33b is formed below the root portion of the outlet 22b side. However, almost no change was observed in self-priming performance and pumping performance.
[0042]
The direction of the second notch 33b is a direction along the boundary surface of the upper recoil barrier 21a. Since the second notch 33b intersects at an acute angle with the direction of the air / water mixed flow pumped along the upper partition 22a and does not face the centrifugal flow component, one of the air / water mixed flows along the upper partition 22a Since the partial return flow enters the bag part chamber 33, the second notch 33b itself becomes a local air / water sorting part, and the air / water separation action tends to take water into the bag part chamber 33 while escaping bubbles. And self-priming performance increases.
[0043]
Also in this example, the synchronous water film for the bubble flow in which the return water flow drawn from the first notch 33a to the vicinity of the raking port 20a rises up the oblique guide channel 22 every time one blade is fed at the blade circumferential end. It is thought that it acts as an escapement (non-return).
[0044]
[Third Embodiment]
FIG. 5 (A) is an enlarged plan view showing an impeller casing in a self-priming centrifugal pump according to a third embodiment of the present invention, and FIG. 5 (B) is along the line AA in FIG. 5 (A). It is a cross-sectional arrow view which shows the state cut | disconnected. In FIG. 5, the same parts as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and the description thereof is omitted.
[0045]
The self-priming centrifugal pump of this example has the same configuration as the pump according to the second embodiment shown in FIGS. 3 and 4, but the air vent (fifth flow port) 14e in the second embodiment is deleted. It has a configuration. In addition, although the reinforcing rib 33c of the horizontal direction 2 form is formed in the bag part chamber 33 shown in FIG. 5, such a rib also comprises 1st and 2nd embodiment.
[0046]
As described above, in the configuration in which the bag portion chamber 33 has the first notch (upper water intake portion) 33a and the second notch 33b, the bag portion chamber 33 is drained when the operation is stopped, as in the second embodiment. As well as air / water separation during self-priming operation.
[0047]
In the above-described embodiment, the first notch 33a is shallowly formed mainly for the draining action of the bag chamber 33. However, in order to enhance the air-water separation action, the draining noise is not manifested. It may be formed deeply or the notch width may be widened. The second notch 33b is also formed shallow, but it may be formed deeply or a plurality of thin notches may be formed discretely.
[0048]
【The invention's effect】
As described above, the present invention is characterized in that the drainage path of the bag part chamber is provided first, and the second air / water separation chamber is configured using the bag part chamber and the like second. Since it has features, it has the following effects.
[0049]
(1) Even if water is stored in the bag room due to a gap between the partition plate and the like during pumping operation, water will naturally fall from the bag room to the impeller room when the pump is stopped, preventing water from staying in the bag room. can do. For this reason, accumulation and freezing of fine objects in the bag part chamber can be prevented, and water leakage does not occur when the pump is assembled, thereby improving workability. Furthermore, the fifth distribution port is formed in the partition plate, and the first and second cutouts are only formed in the second case, so that the number of parts is not increased and the cost is reduced. Can also be realized.
[0050]
(2) Since the second air / water separation chamber is provided in the bag chamber or other portion, even if water is stored in the second air / water separation chamber during the pumping operation, the second air / water separation chamber is used when the pump operation is stopped. Since the water naturally falls from the water separation chamber to the impeller chamber, it is possible to prevent water from staying in the second air / water separation chamber, so that the same effect as the above (1) can be obtained.
[0051]
(3) In addition to the air / water separation action by the upper recoil barrier of the first air / water separation chamber, guidance by specific gravity separation in the second air / water separation chamber such as the bag chamber and the return with short circulation time of the priming water Since the water film check valve action of the route is superimposed, the self-priming performance can be improved.
[Brief description of the drawings]
FIG. 1A is a plan view showing an impeller casing in a self-priming centrifugal pump according to a first embodiment of the present invention, and FIG. 1B is a plan view of the end casing in the self-priming centrifugal pump as seen upside down. (C) is the top view which looked at the partition plate in the self-priming type centrifugal pump inside out.
2A is an enlarged plan view showing the impeller casing of the first embodiment, and FIG. 2B is a sectional view taken along the line AA in FIG.
FIG. 3A is a plan view showing an impeller casing in a self-priming centrifugal pump according to a second embodiment of the present invention, and FIG. 3B is a plan view of the end casing in the self-priming centrifugal pump as seen upside down. (C) is the top view which looked at the partition plate in the self-priming type centrifugal pump turned upside down.
FIG. 4A is an enlarged plan view showing an impeller casing of a second embodiment, and FIG. 4B is a cross-sectional view taken along the line AA in FIG.
5A is an enlarged plan view showing an impeller casing according to a third embodiment, and FIG. 5B is a cross-sectional view taken along the line AA of FIG.
FIG. 6 is a partial longitudinal sectional view showing a conventional self-priming centrifugal pump.
7A is a plan view of an impeller casing showing a state seen along the line AA in FIG. 6, and FIG. 7B is an end casing showing a state seen along the line BB in FIG. 6; (C) is a top view of the partition plate which shows the state seen along the BB line of FIG.
[Explanation of symbols]
1 ... Direction of centrifugal flow scraping (direction of guide path)
9 ... Gasket plate
10. Motor housing (drive chamber case)
11 ... Driving magnet disk
12 ... Bulkhead plate
13 ... Impeller casing
14 ... Metal divider
14a ... Round distribution port (first distribution port)
14b ... priming outlet (fourth outlet)
14c ... Upper distribution port (second distribution port)
14d ... Reflux port (third distribution port)
14e ... Air vent (fifth distribution port)
15 ... End casing (pump cover)
16 ... fixed shaft
17 ... Driven magnetic disk
18 ... Centrifugal impeller (impeller)
18a ... spiral blade
18b ... Front shroud
19 ... Motor shaft
20 ... Impeller room
21 ... Ambient wall
21a ... Upper recoil barrier
22 ... Diagonal guide channel
22a ... Upper partition
22b ... Outlet
23a ... Gas-water separation chamber
24 ... Inhalation joint
25 ... Discharge joint
26 ... Boss presser
27 ... Inhalation chamber
28 ... Open annular partition
29 ... annular introduction part
30 ... Puddle space
31 ... Discharge chamber
33 ... Bag club room
33a ... 1st notch (lower drainage part)
33b ... Second notch (upper water intake)
33c ... Reinforcing rib

Claims (9)

A first case having a suction chamber communicating with the suction port; a discharge chamber communicating with the discharge port and having a water reservoir space at a lower portion; an impeller chamber communicating with the suction chamber and housing a centrifugal impeller therein; and the centrifugal type An oblique guide channel for deriving a centrifugal flow by the impeller obliquely upward from the impeller chamber; and an outlet of the oblique guide channel, the lower guide wall being positioned with respect to the oblique guide channel. A second case having an air-water separation chamber having an upper recoil barrier facing the bag, a bag chamber located at an upper corner of the oblique guide channel with an upper partition therebetween, and an overlap A first flow port that is sandwiched between the first case and the second case, and communicates the suction chamber and the impeller chamber, and the air / water separation chamber and the discharge chamber at the top. A second circulation port that communicates and the air-water separation below the second circulation port In self-priming centrifugal pump comprising a partition plate having a said third flow port for communicating the water reservoir space, the fourth flow port communicating with said impeller chamber and the water reservoir space,
The partition plate has a fifth flow port that communicates the discharge chamber and the bag portion chamber at an upper portion thereof, and the second case communicates the bag portion chamber and the impeller chamber at a lower portion of the upper partition wall. A self-priming centrifugal pump characterized by comprising a first notch.   2. The self-priming centrifugal pump according to claim 1, wherein the second case has a second notch communicating with the oblique guide channel and the bag portion chamber at an upper portion of the upper partition. A self-priming centrifugal pump characterized by that. A first case having a suction chamber communicating with the suction port; a discharge chamber communicating with the discharge port and having a water reservoir space at a lower portion; an impeller chamber communicating with the suction chamber and housing a centrifugal impeller therein; and the centrifugal type An oblique guide channel for deriving a centrifugal flow by the impeller obliquely upward from the impeller chamber; and an outlet of the oblique guide channel, the lower guide wall being positioned with respect to the oblique guide channel. A second case having an air-water separation chamber having an upper recoil barrier facing the bag, a bag chamber located at an upper corner of the oblique guide channel with an upper partition therebetween, and an overlap A first flow port that communicates between the suction chamber and the impeller chamber, and communicates the air / water separation chamber and the discharge chamber at the top. A second circulation port, and the air / water separation chamber below the second circulation port. The third flow port for communicating the serial water reservoir space, and the self-priming centrifugal pump comprising a partition plate having a fourth flow port communicating with said impeller chamber and the water reservoir space,
The second case has a first notch communicating the bag portion chamber and the impeller chamber with a lower portion of the upper partition wall, and communicates the oblique guide channel and the bag portion chamber with an upper portion of the upper partition wall. A self-priming centrifugal pump characterized by comprising a second notch.   4. The self-priming centrifugal pump according to claim 2, wherein the second notch is formed at an outlet side root portion of the upper partition wall. 5. The self-priming centrifugal pump according to claim 4, wherein the second notch is formed along the upper recoil barrier.   The self-priming centrifugal pump according to any one of claims 2 to 5, wherein the first notch is formed in a root portion of the upper partition wall on a scraping opening side of the impeller chamber. A self-priming centrifugal pump characterized by that. The self-priming centrifugal pump according to claim 6, wherein the first notch is formed in parallel to the upper recoil barrier . A centrifugal impeller immersed in the priming water of the water storage space is rotatably supported, an impeller chamber communicating with the suction port, a guide flow path for deriving a centrifugal flow by the centrifugal impeller from the impeller chamber, and the guide flow path A first rebounding barrier that faces the air outlet, separates the air-water mixed water radiated from the air outlet, returns the separated water to the water reservoir space, and draws the separated gas to the outlet. In a self-priming centrifugal pump comprising a gas-water separation chamber,
A part of the air / water mixed water flowing on the guide channel to the outlet is taken from the upper intake part to separate the water, and the separated water is separated from the upper partition wall of the guide channel via the lower drain part. A self-priming centrifugal pump comprising a second air / water separation chamber that returns to the root portion of the impeller chamber on the raking outlet side.   5. The self-priming centrifugal pump according to claim 4, wherein the second air-water separation chamber communicates with the discharge chamber through an air vent at an upper portion thereof.

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