JP4498239B2 - Self-priming tank for self-priming pump and self-priming pump having the self-priming tank - Google Patents

Description

The present invention relates to a pump having an impeller for pumping liquid, and more particularly, to a pump suction port of a pump casing of a pump having an impeller (hereinafter, a pump having an impeller is referred to as a “centrifugal pump”). The present invention relates to a self-priming tank for disposing in front and a self-priming pump having the self-priming tank.

  The self-priming pump used to pump liquid does not feed liquid mixed with air to the pump discharge port, so air and liquid are separated before the pump liquid suction port and air is selected. It is known to provide a gas-liquid separation chamber such as a self-priming tank that discharges automatically. However, the conventional self-priming pumps have been manufactured as a self-priming type from the beginning of manufacture, and in many cases, the gas-liquid separation chamber and the pump casing are integrally formed. For this reason, it is usually difficult to convert a non-self-priming pump into a self-priming pump, and the usage and place of use of the pump are limited.

On the other hand, as shown in FIG. 8, a non-self-priming pump self-priming tank 8 is also present, which can be easily modified to self-priming pump, the pump this compound, which has a pump discharge port 4 impeller 5 and thereon An integrated storage tank 13 having a lower portion connected by a packing 10 and a self-priming tank 8 having a nominal water inlet 14, a faucet 15, and a self-priming tank suction port 11 are installed on the upper portion of the casing 2 in front of the pump suction port 3. It has a configuration. However, the self-priming tank 8 does not have a role of a gas-liquid separation chamber, and has a structure in which liquid corresponding to the volume in the self-priming tank 8 is sucked from the self-priming tank suction port 11 and is self-primed. As described above, the structure is such that the storage tank 13 is installed in front of the pump suction port 3 of the pump casing 2 and the pumping performance of the pump is significantly reduced. Therefore, it is difficult to use the non-self-priming pump as a self-priming pump.

Japanese Patent Publication No. 7-47960 Japanese Patent No. 2785957

  The problem to be solved by the present invention is to solve the above-mentioned problem. By suppressing the piping resistance in the self-priming tank, the pumping performance of the pump is prevented from being lowered. By providing a structure that does not accumulate air in the air, it suppresses the increase in noise generated during the operation of the pump and provides a self-priming tank that can secure the amount of liquid for re-self-priming. To provide a self-priming tank having the above-described performance that can be easily modified to a self-priming pump and a self-priming pump to a non-self-priming pump, and a self-priming pump having this self-priming tank. Is to provide.

As a means of the present invention for solving the problems, the invention of claim 1 is a self-priming tank for a pump that sucks up a liquid at a position lower than the pump itself. connecting pipe and provided with a wicking pipe, and disposed on the suction side leading the reservoir tank to the pump inlet, the pump and the other end to one end of the connecting pipe between the pump in communication with the bottom of the storage tank portion of the connected to the inlet, the other end of the one end of the suction-side separating tube in conjunction with a wicking piping to dive into the liquid disposed in communication with the lower portion of the reservoir tank and the suction side separation tube And the upper part of the storage tank are connected to each other, and the small-diameter upper passage that prevents the liquid from entering the storage tank from the suction separation pipe, and the suction side separation pipe and the lower part of the storage tank part are communicated with each other. Let it be larger than the upper passage of the small diameter Is a self-priming tank, characterized in that the the is disposed and a lower passage.

The invention according to claim 2 is characterized in that the suction side separation pipe, one end of which is connected to a suction pipe that is submerged in the liquid and the other end is connected to the lower part of the storage tank part, is further provided in the storage tank part. 2. The self-priming tank according to claim 1, wherein the tank is in communication with the storage tank portion between an upper portion and a lower portion of the storage tank portion.

According to a third aspect of the present invention, the suction-side separation pipe having one end connected to a suction pipe that lies in the liquid and the other end communicated with the lower part of the storage tank section has an inner diameter of the storage tank. The self-priming tank according to claim 1 or 2, wherein the self-priming tank expands from the upper part of the part toward the lower part of the storage tank part.

According to a fourth aspect of the present invention, a connecting pipe connected to the pump having one end communicating with the lower portion of the storage tank portion and the other end connected to the pump suction port is disposed in communication with the suction side separation pipe. It is a self-priming tank of the means of any one of Claims 1-3 characterized by the above-mentioned.

The invention of claim 5 is a self-priming type characterized in that the self-priming tank of the means of any one of claims 1 to 4 is detachably disposed in front of the pump suction port of the pump casing. It is a pump.

As described above, according to the present invention, by installing a self-priming tank in front of the pump suction port of the pump casing, it is possible to self-suck the amount corresponding to the self-priming tank volume, and the storage tank portion and the suction By dividing the piping part, the piping resistance due to the self-priming tank can be suppressed, the pumping performance of the pump can be prevented from lowering, and the pump does not accumulate air in the self-priming tank. An increase in noise during operation can be suppressed, and an excellent effect is achieved such that the amount of liquid for self-supply during re-operation can be secured. Furthermore, since the self-priming tank is detachably attached, the present invention has an excellent effect such that the non-self-priming pump can be easily modified to a self-priming pump.

  The best mode for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

  FIG. 1 is a view showing a main part of a self-priming pump according to a first embodiment of the present invention, (a) is a rear view seen from the left side, (b) is a side view shown in section, c) is a front view seen from the right side. 2A and 2B are detailed views of the semi-open centrifugal impeller used in the present invention. FIG. 2A is a side view showing a partial cross section, and FIG. 2B is a front view seen from the right side. 3 is a cross-sectional view of the suction side separation pipe of the self-priming pump of FIG. 1, in which (a) is an XX cross-sectional view and (b) is a YY cross-sectional view. FIGS. 4A and 4B are diagrams showing a main part of the self-priming pump according to the second embodiment of the present invention, wherein FIG. 4A is a side view showing a section, and FIG. 4B is a front view seen from the right side. 5 is a cross-sectional view of the suction side separation pipe of the self-priming pump of FIG. 4, (a) is an XX cross-sectional view, and (b) is a YY cross-sectional view. FIGS. 6A and 6B are diagrams showing a main part of a self-priming pump according to a third embodiment of the present invention, wherein FIG. 6A is a side view showing a section, and FIG. 6B is a front view seen from the right side. 7 is a cross-sectional view of the suction side separation pipe of the self-priming pump of FIG. 6, (a) is an XX cross-sectional view, (b) is a YY cross-sectional view, and (c) is a ZZ cross-sectional view. It is. FIG. 9 is a schematic diagram showing a tank facility using a first self-priming tank and a pump in the present invention. FIG. 10 is a schematic diagram showing a tank facility using a second self-priming tank and a pump according to the present invention, where (a) is an overall view and (b) is an AA cross-sectional view of the suction side separation pipe 12. It is. FIG. 11 is a schematic diagram showing a tank facility using a third self-priming tank and a pump according to the present invention.

A centrifugal pump 1 shown in FIG. 1 has a pump casing 2 molded from a synthetic resin such as PPE resin. The pump casing 2 made of synthetic resin has a pump suction port 3 at the center thereof, and a pump discharge port 4 at the upper part of the side surface of the pump casing 2. An impeller 5 molded from a synthetic resin such as PPE resin that is rotated by a motor (not shown) or the like is disposed inside the pump casing 2.

As shown in FIG. 2, the impeller 5 has a circular back plate 6, and a spiral blade 7 is provided on the back plate 6 with a blade front end 7 a extending from the back plate 6 to the front side. A semi-open type impeller 5 is formed. In this embodiment, seven blades 7 are provided. By rotating the impeller 5, the liquid sucked from the pump suction port 3 on the front side of the pump casing 2 is conveyed toward the pump discharge port 4. Moreover, in this embodiment, although the centrifugal pump 1 is used, you may use rotary pumps, such as another cascade pump.

A self-priming tank 8 is fixed by a presser plate 9 so as to face the pump suction port 3 of the pump casing 2. The packing 10 sandwiched between the pump casing 2 and the self-priming tank 8 plays a role of keeping secret between the pump casing 2 and the self-priming tank 8. In addition, the self-priming tank 8 secures the amount of liquid necessary for self-priming with the suction pipe section composed of the suction- side separation pipe 12 connected from the self-priming tank suction port 11 to the pump suction port 3 of the pump casing 2. There is a storage tank portion consisting of the storage tank 13 for the purpose. In the upper part of the storage tank 13, a priming port 14 for injecting a liquid amount necessary for the initial self-priming is provided. This priming port 14 is covered with a priming faucet 15 that can be freely opened and closed. Further, the self-priming tank 8 sucks a passage 16 connecting the storage tank 13 and the self-priming tank suction port 11 with the suction side separation pipe 12 connected to the pump suction port 3 of the pump casing 2 with the front side of the storage tank 13. It is provided between the rear side of the side separation tube 12. The passage 16 transfers the liquid inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12 and the gas inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12. And is provided for transport.

  By the way, the pumping performance of the pump varies greatly depending on the pipe resistance, and this pipe resistance varies depending on the cross-sectional shape of the pipe through which the liquid passes and the change in expansion or contraction of the cross-sectional shape. Therefore, in the present invention, it is necessary to make the passage 16 communicating the storage tank 13 and the suction side separation pipe 12 as small as possible. In the present embodiment, as shown in FIG. 3, a passage 16a enlarged only at the lower portion of the storage tank 13 is provided, and a thin passage 16b is provided above the passage 16a to connect the storage tank 13 and the suction side separation pipe 12. ing. Further, the cross-sectional area of the passage 16 a is provided in a structure that gradually decreases from the storage tank 13 toward the suction side separation pipe 12. Accordingly, the liquid is easily transferred from the storage tank 13 to the suction side separation pipe 12, and conversely, the liquid is hardly transferred from the suction side separation pipe 12 to the storage tank 13. Next, since the cross-sectional area of the passage 16b is for discharging the gas inside the storage tank 13 from the storage tank 13 to the suction side separation pipe 12 as described above, the storage tank 13 is connected to the suction side separation pipe 12. It is made as small as possible in order to suppress the ingress of liquids. The passage 16b is opened to the upper part of the storage tank 13 so that all the gas in the storage tank 13 can be discharged.

  With the above configuration, in the suction side separation pipe 12, the change in the cross-sectional area as described above is restricted, and an increase in pipe resistance is suppressed. In addition, since the pipe resistance changes depending on the flow velocity, the inner diameter of the suction side separation pipe 12 is increased in order to suppress an increase in the pipe resistance. In this case, the diameter of the suction side separation pipe 12 is gradually changed in order to suppress the loss due to the expansion and reduction of the cross-sectional area in the increase and decrease methods. Further, the self-priming tank 8 has a structure in which liquid does not accumulate in the self-priming tank 8 when the pump casing 2 has a drain hole. The self-priming tank 8 has a structure that is detachably attached to the centrifugal pump 1. Therefore, by using the self-priming tank 8 of the present invention, it is possible to easily convert the self-priming pump into a non-self-priming pump and the non-self-priming pump into a self-priming pump. is there.

Next, a method for using the self-priming pump shown in FIG. 1 will be described. First, the priming faucet 15 is removed, a liquid is injected from the priming port 14, the interior of the storage tank 8 is filled, and then the priming faucet 15 is attached and closed. At this time, the injected liquid has entered the pump casing 2 through the passage 16 and the suction side separation pipe 12, and the pump casing 2 and the self-priming tank 8 are filled with the liquid. Next, the main body of the centrifugal pump 1 is activated and rotated by a motor (not shown). The centrifugal pump 1 that has been started and rotated sucks the liquid in the self-priming tank 8 into the pump casing 2 from the pump suction port 3 and conveys it to the pump discharge port 4 by the rotation of the impeller 5. By doing so, the inside of the self-priming tank 8 becomes negative pressure, and the liquid sucked from the self-priming tank suction port 11 is sucked into the self-priming tank 8.

This suction completes the self-priming into the self-priming tank 8, and the sucked liquid is repeatedly transported from the suction-side separation pipe 12 to the pump casing 2. Incidentally, at this time, the suction side separation pipe 12 becomes the selected conveyance path, and gas is present inside the storage tank 13. The gas inside the storage tank 13 is sucked into the suction side separation pipe 12 through the passage 16 by the negative pressure generated by the liquid passing through the suction side separation pipe 12. The sucked gas is transported into the pump casing 2 through the suction side separation pipe 12 and discharged from the pump discharge port 4 by the rotation of the impeller 5. By repeating this, all the gas inside the storage tank 13 is discharged and filled with liquid. Thereby, the pumping performance of the centrifugal pump 1 is exhibited without waste. In addition, the suction height that can be self-sucked during self-suction is the suction volume of the self-suction tank 8, that is, the suction side separation pipe that continues from the storage tank 13 and the self-suction tank suction port 11 to the pump suction port 3 of the pump casing 2. Determined by 12 internal volumes. The self-priming height can be adjusted by changing the internal volume and designing the self-priming tank 8.

FIG. 4 is a cross-sectional view showing a part of the self-priming tank 8 of the self-priming pump according to the second embodiment of the present invention. Similar to the one shown in FIG. 1, the self-priming tank 8 shown in FIG. 4 is installed facing the pump suction port 3 of the pump casing 2 of the main body of the centrifugal pump 1. Although not shown in FIG. 4, the packing 10 sandwiched between the pump casing 2 and the self-priming tank 8 plays a role of keeping the airtightness between the pump casing 2 and the self-priming tank 8. By the way, the self-priming tank 8 has a suction pipe portion composed of a suction-side separation pipe 12 connected from the self-priming tank suction port 11 to the pump suction port 3 of the pump casing 2 and the amount of liquid necessary for self-priming. There is a storage tank portion consisting of a storage tank 13 for securing. In the upper part of the storage tank 13, a priming port 14 for injecting a liquid amount necessary for the initial self-priming is provided. The priming port 14 is not shown in FIG. Similarly, a water faucet 15 that can be freely opened and closed is covered. Further, the self-priming tank 8 has a passage 16 a that connects the storage tank 13 and the self-priming tank suction port 11 to the suction side separation pipe 12 connected to the pump suction port 3 of the pump casing 2. In addition, the passage 16b is provided on the front side of the upper portion of the storage tank 13, respectively.

  This passage 16a is used for transferring the liquid inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12 during self-priming, and the passage 16b is used for the storage tank 13 after completion of self-suction. Is provided for transferring the gas existing inside the pump casing 2 through the suction side separation pipe 12. Further, the cross-sectional area of the passage 16a is configured to gradually decrease from the storage tank 13 toward the suction side separation pipe 12. As a result, a negative pressure is generated, so that the liquid is easily transferred from the storage tank 13 to the suction side separation pipe 12, and conversely, it is difficult to transfer the liquid from the suction side separation pipe 12 to the storage tank 13. As a result, the change in the cross-sectional area as described above in the suction side separation pipe 12 is suppressed, and an increase in pipe resistance is suppressed. Next, since the cross-sectional area of the passage 16b is for discharging the gas inside the storage tank 13 from the storage tank 13 to the suction-side separation pipe 12 as described above, the suction tank-side separation pipe 12 to the storage tank 13 The size is made as small as possible in order to prevent the liquid from entering.

  Further, the cross-sectional area of the suction-side separation pipe 12 communicating with the passage 16b makes it easy to suck in the gas inside the storage tank 13, so that the negative pressure is easily generated by slightly reducing the pipe line. Further, as described above, the pipe resistance changes the flow velocity of the other portions of the suction side separation pipe 12, and thus the inner diameter of the suction side separation pipe 12 is increased in order to suppress an increase in the pipe resistance. The increase and decrease methods are gradually changed in order to suppress the loss due to the expansion and reduction of the cross-sectional area. Further, the self-priming tank 8 has a structure in which liquid does not accumulate inside the self-priming tank 8 when the pump casing 2 has a drain hole. The self-priming tank 8 has a structure that is detachably attached to the main body of the centrifugal pump 1. Therefore, by using the self-priming tank 8 of the present invention, it is possible to easily convert the self-priming pump into a non-self-priming pump and the non-self-priming pump into a self-priming pump. is there.

Furthermore, in the method of using the self-priming pump of the second embodiment, liquid is injected from the priming port 14 shown in FIG. 4 to fill the storage tank 13, and then a priming faucet 15 (not shown). Install. At this time, the injected liquid has entered the pump casing 2 through the passage 16a and the suction side separation pipe 12, and the pump casing 2 and the self-priming tank 8 are filled with the liquid. Next, the main body of the centrifugal pump 1 (not shown) is activated. The activated main body of the centrifugal pump 1 sucks the liquid in the pump casing 2 and the self-priming tank 8 from a pump suction port 3 (not shown) and conveys the liquid to the pump discharge port 4. By doing so, the inside of the self-priming tank 8 becomes negative pressure, and the liquid is sucked up from the self-priming tank suction port 11. As a result, the self-priming is completed, and the sucked liquid is repeatedly conveyed from the suction side separation pipe 12 to the pump casing 2. However, at that time, the suction side separation pipe 12 becomes the selected conveyance path, and gas is present inside the storage tank 13. The gas inside the storage tank 13 is sucked into the suction side separation pipe 12 through the passage 16b by the negative pressure generated by the liquid passing through the suction side separation pipe 12. The sucked gas passes through the suction side separation pipe 12 and is conveyed into the pump casing 2 (not shown), and is discharged from the pump discharge port 4. By repeating this, all the gas inside the storage tank 13 is discharged and filled with liquid. As a result, the pumping performance of the main body of the centrifugal pump 1 is exhibited.

FIG. 6 is a sectional view showing a part of the self-priming tank 8 of the self-priming pump according to the third embodiment of the present invention. The self-priming tank 8 shown in FIG. 6 is installed facing the pump suction port 3 of the pump casing 2 of the main body of the centrifugal pump 1 (not shown) in the same manner as that shown in FIG. A packing 10 (not shown) sandwiched between the pump casing 2 and the self-priming tank 8 plays a role of keeping the airtightness between the pump casing 2 and the self-priming tank 8. In addition, the self-priming tank 8 secures the amount of liquid necessary for self-priming with the suction pipe section composed of the suction- side separation pipe 12 connected from the self-priming tank suction port 11 to the pump suction port 3 of the pump casing 2. There is a storage tank portion consisting of the storage tank 13 for the purpose. An upper portion of the storage tank 13 is provided with a priming port 14 for injecting a liquid amount necessary for the initial self-priming, and the priming port 14 is covered with an openable / closable priming faucet 15 (not shown). It has been. Further, the self-priming tank 8 has a passage 16 a that communicates between the storage tank 13 and the self-priming tank suction port 11 and the suction side separation pipe 12 connected to the pump suction port 3 of the pump casing 2 at the lower part of the storage tank 13. The passage 16b is provided between the front side of the upper portion of the storage tank 13 and the back side of the suction side separation pipe 12.

  The passage 16a transfers the liquid inside the storage tank 13 to the pump casing 2 during self-priming, and the passage 16b separates the gas present inside the storage tank 13 after the self-priming is completed. It is provided for transfer through the tube 12 into the pump casing 2. Further, the cross-sectional area of the passage 16 a is configured to gradually decrease from the storage tank 13 toward the suction side separation pipe 12. Due to this, a negative pressure is generated, so that the liquid is easily transferred from the storage tank 13 to the suction side separation pipe 12, and conversely, it is difficult to transfer the liquid from the suction side separation pipe 12 to the storage tank 13. Thereby, in the suction side separation pipe 12, the change in the cross-sectional area as described above is suppressed, and an increase in pipe resistance is suppressed. Next, since the cross-sectional area of the passage 16b is for discharging the gas inside the storage tank 13 from the storage tank 13 to the suction side separation pipe 12 as described above, the storage tank 13 is connected to the suction side separation pipe 12. It is made as small as possible in order to suppress the ingress of liquids. Further, the cross-sectional area of the suction side separation pipe 12 communicating with the passage 16b makes it easy to suck the gas inside the storage tank 13, so that the negative pressure is easily generated by slightly reducing the pipe line.

  Further, as described above, the pipe resistance of the other part of the suction side separation pipe 12 connected to the passage 16b also changes depending on the flow velocity. Therefore, in order to suppress an increase in the pipe resistance, The inner diameter is increased. The increase and decrease methods are gradually changed in order to suppress the loss due to the expansion and reduction of the cross-sectional area. Further, the self-priming tank 8 has a structure in which liquid does not accumulate in the self-priming tank 8 when the pump casing 2 has a drain hole. Since the self-priming tank 8 is detachably attached to the centrifugal pump 1, the self-priming pump is replaced with a non-self-priming pump, and vice versa. Remodeling can be easily performed.

  Further, the method of using the self-priming pump of the third embodiment is the same as the method of using the self-priming pump shown in FIG.

  When a pumping experiment was conducted using the self-priming pump of the present invention in the first to third embodiments, it was found that all the embodiments had a self-priming effect. The self-priming effect and the pumping performance are the best in the first embodiment, and then the second embodiment and the third embodiment are almost equivalent.

FIG. 9 is a schematic diagram showing tank equipment using the first self-priming tank 8 and the centrifugal pump 1 of the present invention described above. Similar to that shown in FIG. 1, the self-priming tank 8 shown in FIG. 9 is installed to face the pump suction port 3 of the pump casing 2 of the main body of the centrifugal pump 1 (not shown).

By the way, in this self-priming tank 8, a suction pipe portion composed of a suction side separation pipe 12 connected to a suction pipe 18 for sucking up liquid at a position lower than the pump itself, and liquid necessary for self-priming. There is a connecting pipe 17 between a storage tank portion made up of a storage tank 13 for securing the amount and a pump connected to the pump suction port 3. In the upper part of the storage tank 13, a priming port 14 for injecting a liquid amount required for the initial self-priming is provided, and the priming port 14 can be opened and closed as in FIG. 1. 15 is covered. Further, the self-priming tank 8 includes a passage 16a that communicates a suction pipe portion composed of a suction side separation pipe 12 connected to the storage tank 13 and the suction pipe 18 and a connection pipe 17 connected to the pump suction port 3. In the lower part of the storage tank 13, and a passage 16 b in the upper part of the storage tank 13.

  This passage 16a is used for transferring the liquid inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12 during self-priming, and the passage 16b is used for the storage tank 13 after completion of self-suction. Is provided for transferring the gas existing inside the pump casing 2 through the suction side separation pipe 12.

  The self-priming tank 8 has a structure that is detachably attached to the main body of the centrifugal pump 1. Therefore, by using the self-priming tank 8 according to the present invention, it is possible to easily modify the self-priming pump to a non-self-priming pump and the non-self-priming pump to a self-priming pump. It is.

Further, in the method of using the self-priming pump, liquid is injected from the priming port 14 shown in FIG. 9 and the storage tank 13 is filled, and then the priming faucet 15 is attached. At this time, the injected liquid enters the inside of the pump casing 2 (not shown) via the passage 16a and the connection pipe 17 with the pump, and the inside of the pump casing 2 and the self-priming tank 8 is filled with the liquid. . Next, the main body of the centrifugal pump 1 is activated. The activated main body of the centrifugal pump 1 sucks the liquid in the pump casing 2 and the self-priming tank 8 (not shown) from the pump suction port 3 and conveys them to the outlet 4. By doing so, the inside of the self-priming tank 8 becomes negative pressure, and the liquid 19 is sucked up from the self-priming tank suction port 11 through the suction pipe 18. As a result, the self-priming is completed, and the sucked liquid is repeatedly conveyed from the suction side separation pipe 12 to the pump casing 2. However, at that time, the suction side separation pipe 12 becomes the selected conveyance path, while gas is present inside the storage tank 13. The gas inside the storage tank 13 is sucked into the suction side separation pipe 12 through the passage 16 b by the negative pressure generated by the liquid passing through the suction side separation pipe 12. The sucked gas passes through the suction-side separation pipe 12 and the connection pipe 17 with the pump, is transported into the pump casing 2 (not shown), and is discharged from the pump discharge port 4. By repeating this, all the gas inside the storage tank 13 is discharged and filled with liquid. As a result, the pumping performance of the main body of the centrifugal pump 1 is exhibited.

FIG. 10 is a schematic diagram showing the tank equipment using the second self-priming tank 8 and the centrifugal pump 1 of the present invention, and shows the tank equipment using the self-priming tank 8 and the centrifugal pump 1. It is a typical schematic diagram. Similarly to the one shown in FIG. 9, the self-priming tank 8 shown in FIG. 10 is installed to face the pump suction port 3 of the pump casing 2 of the main body of the centrifugal pump 1 although not shown. By the way, in this self-priming tank 8, a suction pipe portion composed of a suction-side separation pipe 12 connected to a suction pipe 18 for sucking up liquid at a position lower than the pump itself, and a liquid amount necessary for self-priming. There is a connecting pipe 17 for connecting a storage tank portion made up of a storage tank 13 for securing the pump and a pump connected to the pump suction port 3. In the upper part of the storage tank 13, a priming port 14 for injecting a liquid amount necessary for the initial self-priming is provided. The priming port 14 can be opened and closed as in FIG. 15 is covered. Further, the self-priming tank 8 includes a passage 16a that communicates a suction pipe portion composed of a suction side separation pipe 12 connected to the storage tank 13 and the suction pipe 18 and a connection pipe 17 connected to the pump suction port 3. the sides of the suction pipe part in the lower part, also made the passage 16b for connecting the suction pipe section consisting of a suction-side separating pipe 12 which communicates with the reservoir tank 13 and the suction pipe 18 from the suction side separation line 12 of the storage tank 13 Respectively.

  This passage 16a is used for transferring the liquid inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12 during self-priming, and the passage 16b is used for the storage tank 13 after completion of self-suction. Is provided for transferring the gas existing inside the pump casing 2 through the suction side separation pipe 12.

  The self-priming tank 8 has a structure that is detachably attached to the main body of the centrifugal pump 1. Therefore, by using the self-priming tank 8 according to the present invention, it is possible to easily modify the self-priming pump to a non-self-priming pump and the non-self-priming pump to a self-priming pump. It is.

  Further, the method of using the self-priming tank 8 shown in the second schematic schematic view of the present invention is the same as the method of using the self-priming pump shown in FIG.

FIG. 11 is a schematic diagram showing the tank equipment using the third self-priming tank 8 and the centrifugal pump 1 of the present invention, and shows the tank equipment using the self-priming tank 8 and the centrifugal pump 1. It is a typical schematic diagram. Similar to the one shown in FIG. 1, the self-priming tank 8 shown in FIG. 11 is installed to face the pump suction port 3 of the pump casing 2 of the main body of the centrifugal pump 1 (not shown). By the way, in this self-priming tank 8, a suction pipe portion composed of a suction-side separation pipe 12 connected to a suction pipe 18 for sucking up liquid at a position lower than the pump itself, and a liquid amount necessary for self-priming. There is a connecting pipe 17 for connecting a storage tank portion made up of a storage tank 13 for securing the pump and a pump connected to the pump suction port 3. Further, the suction side separation pipe 12 and the connection pipe 17 for the pump are communicated with each other. In addition, a priming port 14 for injecting an amount of liquid necessary for the initial self-priming is provided in the upper part of the storage tank 13, and the priming port 14 can be opened and closed similarly to FIG. A stopper 15 is put on. Further, the self-priming tank 8 includes a passage 16a that communicates a suction pipe portion composed of a suction side separation pipe 12 connected to the storage tank 13 and the suction pipe 18 and a connection pipe 17 connected to the pump suction port 3. In the lower part of the storage tank 13, and a passage 16 b in the upper part of the storage tank 13.

  This passage 16a is used for transferring the liquid inside the storage tank 13 to the pump casing 2 via the suction side separation pipe 12 during self-priming, and the passage 16b is used for the storage tank 13 after completion of self-suction. Is provided for transferring the gas existing inside the pump casing 2 through the suction side separation pipe 12.

  The self-priming tank 8 has a structure that is detachably attached to the main body of the centrifugal pump 1. Therefore, by using the self-priming tank 8 according to the present invention, it is possible to easily modify the self-priming pump to a non-self-priming pump and the non-self-priming pump to a self-priming pump. It is.

  Furthermore, the usage method of the self-priming tank 8 shown in the third schematic diagram of the present invention is the same as the usage method of the self-priming pump shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the principal part of the self-priming pump of the 1st Embodiment of this invention, (a) is a rear view seen from the left side, (b) is a side view shown in a section, (c) is a right side It is the front view seen from. It is detail drawing of the semi-open type centrifugal impeller used for this invention, (a) is a side view shown with a partial cross section, (b) is the front view seen from the right side. It is sectional drawing of the suction side separation pipe of a self-priming pump, (a) is XX sectional drawing of FIG. 1, (b) is YY sectional drawing of FIG. It is sectional drawing which shows the part of the self-priming tank of the self-priming pump of the 2nd Embodiment of this invention, (a) is a side view shown in a cross section, (b) is the front view seen from the right side. It is sectional drawing of the suction side separation pipe of a self-priming pump, (a) is XX sectional drawing of FIG. 4, (b) is YY sectional drawing of FIG. It is sectional drawing which shows the part of the self-priming tank of the self-priming pump of the 3rd Embodiment of this invention, (a) is a side view shown by a cross section, (b) is the front view seen from the right side. It is sectional drawing of the suction side separation pipe of a self-priming pump, (a) is XX sectional drawing of FIG. 6, (b) is YY sectional drawing of FIG. 6, (c) is ZZ of FIG. It is sectional drawing. It is principal part sectional drawing of the conventional detachable self-priming tank, (a) is a side view shown with a cross section, (b) is the front view seen from the right side. It is a typical schematic diagram showing tank equipment using the 1st self-priming tank and pump in the present invention. It is a schematic diagram which shows the tank installation using the 2nd self-priming tank and pump in this invention, (a) is a general view, (b) is AA sectional drawing of a suction side separation pipe. It is a typical schematic diagram showing tank equipment using the 3rd self-priming tank and pump in the present invention.

DESCRIPTION OF SYMBOLS 1 Centrifugal pump 2 Pump casing 3 Pump suction port 4 Pump discharge port 5 Impeller 6 Back plate 7 Blade 7a Blade front end 8 Self-priming tank 9 Presser plate 10 Packing 11 Self-priming tank suction port 12 Suction side separation pipe 13 Storage tank 14 Nominating water Port 15 Call faucet 16 Passage 16a Passage 16b Passage 17 Connection pipe with pump 18 Suction pipe 19 Liquid

Claims (5)

In the pump self-priming tank that sucks up the liquid at a position lower than the pump itself, it has a suction side separation pipe, a storage tank section, a pump suction port, a connection pipe with the pump and a suction pipe , and the storage tank section is used as a pump suction port. Arranged on the suction side that communicates , one end of the connection pipe with the pump communicates with the lower part of the storage tank part, the other end is connected with the pump suction port, and one end of the suction side separation pipe is hidden in the liquid The other end is connected to the suction pipe and communicated with the lower part of the storage tank portion, and the suction side separation pipe and the upper part of the storage tank are communicated to connect the suction separation pipe to the storage tank. An upper passage with a small diameter that prevents the liquid from entering the lower passage, and a lower passage that has a larger diameter than the upper passage with the small diameter by communicating the suction side separation pipe with the lower portion of the storage tank portion. self-priming tank, characterized in that it has disposed. The suction side separation pipe having one end connected to a suction pipe for submerging in the liquid and the other end communicating with the lower part of the storage tank part is further provided from the upper part of the storage tank part to the storage tank part. The self-priming tank according to claim 1, wherein the self-priming tank is in communication with the storage tank portion up to a lower portion. The suction-side separation pipe having one end connected to a suction pipe for submerging in the liquid and the other end communicating with the lower part of the storage tank part has an inner diameter from the upper part of the storage tank part. The self-priming tank according to claim 1, wherein the self-priming tank expands toward a lower portion of the portion. The connection pipe with the pump that connects one end to the lower part of the storage tank portion and connects the other end to the pump suction port is provided to communicate with the suction side separation pipe. The self-priming tank of any one of 1-3. A self-priming pump, wherein the self-priming tank according to any one of claims 1 to 4 is detachably disposed in front of a pump suction port of a pump casing .

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