JP2006233790A - Self-priming pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-priming pump capable of eliminating necessity for increasing mold size of a casing cover above predetermined size even when requiring screw type sewage, drainage, and priming joints. <P>SOLUTION: This self-priming pump is provided with an electric motor 1, a casing 3 provided with an impeller 6 fixed to a rotary shaft 2 of the electric motor 1, an impeller chamber for storing the impeller 6, a discharge passage through which water flowing out from the impeller chamber passes, and a feeding-out tank part for receiving flowing out water, a gas water separation chamber communicating with the feeding-out tank part, a water tank part for storing priming water to feed a part of water flowing out into the impeller chamber, and the casing cover 4 arranging the priming joint 14 for letting priming water flow in on a side face. The drainage joint 13 arranged to drain water remaining in a pump chamber when the pump is not used is provided in the casing 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a circulation pump that is mainly incorporated in a water heater and used for reheating, and more particularly, to a self-priming pump that can suck up bath water in a bath and make it self-prime.

  In general, self-priming pumps are widely used for bath circulation. Conventionally, the function as a hot water heater body was also simple, so the hot water filling of the bathtub was poured directly from the faucet of the bathroom, and then the bathtub water was sucked up and circulated by a pump.

  For this reason, the self-priming pump joint is designed to prevent damage caused by freezing in the winter when residual water is present in the pump when the suction joint and discharge joint for circulating bath water and the water heater is not used. The three drainage joints for draining residual water were all arranged on the casing cover.

  FIG. 4 shows an example of a cross-sectional view of this type of conventional self-priming pump. 5 is a plan view of a casing impeller of a conventional self-priming pump, FIG. 6 is a plan view of a casing partition plate of the conventional self-priming pump, and FIG. 7 is a plan view of the conventional self-priming pump as viewed from the casing cover opening side. FIG.

  In FIG. 4, reference numeral 1 denotes an electric motor. A casing 3 is attached to one side of the electric motor 1, and a rotating shaft 2 of the electric motor 1 is coupled to an impeller 6 in the casing 3. A pump chamber 9 is formed on the open side of the casing 3 by being coupled and sealed to the open side of the casing cover 4 via a partition plate 7 and a packing 8.

  In FIG. 6, the partition plate 7 is formed with a circulation hole 7a for a water flow passage at a predetermined position, a central circulation hole 7c, and a drain hole 7b at the lowermost end. The packing 8 has these circulation holes 7a and drain holes 7b. The water is prevented from leaking from the periphery of the central circulation hole 7c.

  In FIG. 5, an impeller 6 is accommodated in the impeller chamber 3 c of the casing 3. The rotating shaft 2 is protruded from the central portion of the impeller chamber 3c, and the impeller 6 is mounted with the mechanical seal 10 sandwiched between the tip portion and the electric motor 1 and the pump chamber 9 are sealed. Yes.

  The casing 3 has an impeller chamber 3c, and is provided with a discharge passage 3b through which water flows out from the impeller chamber 3c to the delivery tank portion 3a.

  As shown in FIG. 7, a suction passage 4 a communicating with the suction joint 11 and a water tank portion 4 c are formed in the casing cover 4. The suction passage 4 a communicates with the impeller chamber 3 c of the casing 3 through the central flow hole 7 c of the partition plate 7. A drainage joint 13 is provided at the lowermost end of the casing cover 4.

  The drainage joint 13 has various shapes and positions. If the water heater is a wall-hanging type, it is disposed at the lowermost end of the casing cover 4, and if the water heater is a stationary type, the front end of the lowermost casing cover 4 is provided. It is arranged.

  In particular, in the drainage type, a drain plug is generally fixed using a screw, and a thread 13 a is formed on a part of the inside of the drainage joint 13. A drain plug 17 is screwed to press the O-ring 17a at the tip of the drain plug against the seal portion 13b to form a seal.

  12 is a discharge joint, 4b is a steam separation chamber.

  FIG. 8 is a schematic configuration diagram showing a conventional self-priming pump in use. In FIG. 8, 40 is a water heater, 41 is a suction pipe, 42 is a discharge pipe, 43 is a heat exchanger, 44 is a faucet in the bathroom, 45 is a bathtub, and 46 is circulating water.

  Next, the operation will be described. First, exhalation water is poured into the pump chamber 9 in advance. The injected water enters the impeller chamber 3c. Also, circulating water 46 is poured into the bathtub 45 from a faucet 44 in the bathroom.

  Next, when the electric motor 1 is driven, the impeller 6 in the impeller chamber 3c rotates. Then, the water in the impeller chamber 3c is stirred by the impeller 6, and at this time, bubbles are mixed into the water. The water mixed with air enters the delivery tank portion 3a through the discharge passage 3b, and further flows into the water tank portion 4c of the casing cover 4 through the flow hole 7d of the partition plate 7.

  An air / water separation chamber 4b is provided in the upper part of the water tank portion 4c in the casing cover 4, and water flowing out from the flow hole 7d of the partition plate 7 is separated into air and water in the air / water separation chamber 4b. The air is discharged from the discharge joint 12 through the heat exchanger 43 and the discharge pipe 42 into the bathtub 45 as indicated by an arrow C.

  On the other hand, the remaining water returns from the water tank portion 4 c to the impeller chamber 3 c of the casing 3 through the circulation hole 7 a of the partition plate 7 as indicated by an arrow D. That is, water circulates between the impeller chamber 3c and the water tank 4c, and only air flows out to the outside. When this state continues, the pressure gradually decreases in the central portion of the impeller chamber 3c and the suction passage 4a.

  And the circulating water 46 in the bathtub 45 is sucked up by the pressure difference between the pressure in the suction passage 4a and the outside. When the circulating water 46 flows into the suction passage 4a from the suction joint 11 through the suction pipe 41, a full-scale water supply state is entered, and the circulation operation is performed.

  The sucked circulating water 46 is heated by the heat exchanger 43, returns to the bathtub 45 through the discharge pipe 42, and is chased.

  Usually, when a water heater is not used, measures are taken to prevent circulating water from being frozen by a heater or the like in order to prevent freezing, especially at night in winter. It is because it destroys by freezing.

  However, in winter, when the water heater is not used for a long time and the power outlet is not connected, the freeze prevention device does not operate. For this reason, it is necessary to drain water in advance so that the residual water in the pump and heat exchanger does not freeze.

The remaining water in the pump chamber 9 exists in the impeller chamber 3 c and the casing cover 4 in the casing 3. Residual water in the casing 3 communicates with the inside of the casing cover 4 through a drain hole 7 b disposed at the lowermost end of the partition plate 7. All the remaining water in the pump chamber 9 is discharged by opening the drain plug of the drain joint 13 disposed at the lowermost end of the casing cover 4.
JP 2002-303289 A

  However, the functions of water heaters have also diversified, and high-performance water heaters have been required. The user can perform automatic hot water filling with a single remote control button in the bathroom, automatic reheating to keep the bath water temperature constant, or automatically add hot water to the set water level when the bath water level drops A function that can be used was added.

  For this reason, the hot water filling to the bathtub was not poured from the faucet in the bathroom but from the circulation port of the bathtub through the water heater. As a result, it has become common for the primary water supply to be directly connected to the pump outlet of the pump built in the water heater.

  FIG. 9 is a schematic configuration diagram showing a use state of a self-priming pump mounted on a water heater having high functions.

  The primary water supply pipe 47 is configured to be directly connected to the pump chamber 9 via the electromagnetic valve 48. When the user wants to perform automatic hot water filling, the electromagnetic valve 48 is opened by remote control operation, passes through the pump chamber, passes through the suction pipe 41 and the discharge pipe 42, and water is injected from the circulation port 49 connected to the bathtub 45. . When the water is full, the solenoid valve 48 is closed, and when the pump is driven, circulation tracking is performed as in the conventional self-priming pump.

  FIG. 10 is a plan view as seen from the casing cover opening side where the priming joint is disposed. As shown in FIG. 10, the casing cover 4 has a suction joint 11 for flowing the primary water supply into the pump in addition to the suction joint 11, the discharge joint 12, and the drainage joint 13 for circulating the water in the bathtub. It becomes a structure to arrange.

  The exhalation joint 14 may be disposed on the front surface or the side surface of the casing cover 4 depending on the structure of the water heater. The expiratory joint 14 is directly connected to the primary water supply, and therefore needs to be connected to the suction passage 4a side of the casing cover 4 in order to prevent backflow.

  For this reason, in particular, when it is disposed on the side surface of the casing cover 4, it is necessary to provide the tunnel flowing water passage 14a in the water tank portion 4c and communicate with the center of the suction passage 4a.

  FIG. 11 shows a motor drive structure diagram of a casing cover mold provided with a priming joint and a screw type drainage joint. Reference numeral 20 denotes a mold frame.

  When an internal thread is required for the drainage joint 13, the mold structure needs to be configured by a motor drive. In FIG. 11, 22 is a motor, 23 is a main gear, 24 is a sub gear, 25 is a rotary slide pin, and 25a is a slide pin thread.

  When the mold is filled with resin, the thread 13a is formed inside the drainage joint 13 by the slide pin thread 25a. When the motor 22 is driven to rotate, the rotary slide pin 25 rotates via the main gear 23 and the sub gear 24 and moves in the direction of the arrow K, whereby a thread 13 a is formed inside the drainage joint 13. .

  In the case of a structure with a motor drive in a two-part mold, it is necessary to remove the rotary slide pin 25 from the same direction, and therefore, the drainage joint 13 needs to be arranged in the same direction.

  Further, the priming joint 14 is formed by a priming slide pin 21. The expiratory slide pin 21 moves in the direction of arrow L after the resin is filled in the mold, thereby forming the tunnel flowing water passage 14a.

  Since the expiratory slide pin 21 is connected to the suction passage 4a by the tunnel flowing water passage 14a with respect to the center of the casing cover 4, the expiratory slide pin 21 becomes a considerably long slide pin. In order to secure the movable length of the expiratory slide pin 21, a pitch J having a considerable length is required in the case of a double die.

  If the casing cover does not have a motor drive structure, the expiratory joint shown in FIG. 12 is arranged, and the casing cover is made to face up and down as shown in the mold structure diagram of the casing cover without the screw type drainage joint. Since the expiratory slide pin 21 can be disposed outside the mold frame 20, it is a mold of the same size as the casing cover mold in a self-contained pump that is efficiently contained in the mold and does not have a conventional expelling joint. Can be created.

  As described above, in the two-cavity mold in which the screw-type drainage joint 13 is disposed on the casing cover 4 and the priming joint 14 is disposed on the side surface of the casing cover 4, Since the length is long, it is necessary to increase the pitch J, which is a necessary mold size, and the molding machine is also large.

  To achieve the above object, the present invention provides an electric motor, an impeller that is driven by the electric motor to absorb and discharge water, an impeller chamber that houses the impeller, and a discharge passage through which water flowing out of the impeller chamber flows. A casing having a delivery tank portion for receiving water flowing out from the impeller chamber, a steam / water separation chamber communicating with the delivery tank portion, and a part of the water flowing out into the impeller chamber A drainage joint that includes a water tank section for storing exhaled water and a casing cover that is provided on the side surface with an exhalation joint for allowing exhalation to flow in, and discharges water remaining in the pump chamber when the impeller is not driven Is provided in the casing.

  By adopting a configuration in which the drain plug is provided on the casing side by this configuration, an effect that the mold of the casing cover can be produced with the same size as the mold of the conventional self-priming pump and the molding machine can be achieved.

  In the present invention, the drain cover is provided on the casing side, so that the mold of the casing cover can be made in the same size as the mold and the molding machine of the conventional self-priming pump.

  For this reason, the conventional molding can be performed, and the effect of reducing the loss due to the mold and molding machine becoming larger than necessary can be achieved.

  The embodiment of the present invention includes an electric motor, an impeller driven by the electric motor to absorb and discharge water, an impeller chamber for storing the impeller, and a discharge passage through which water flowing out of the impeller chamber is passed. And a casing containing a delivery tank section for receiving water flowing out from the impeller chamber, a steam-water separation chamber communicating with the delivery tank section, and storing expiratory water for sending a part of the water flowing into the impeller chamber A casing is provided with a water tank section and a casing cover with a priming joint for injecting priming water on the side surface, and a drainage coupling for discharging water remaining in the pump chamber when the impeller is not driven is provided in the casing. It is a thing.

  Thus, by providing the drain plug on the casing side, the mold of the casing cover can be created in the same size as the mold of the conventional self-priming pump and the molding machine.

  For this reason, it is possible to perform conventional molding, and it is possible to reduce a loss caused by an excessively large mold and molding machine.

(Embodiment 1)
Hereinafter, the best mode for carrying out the present invention will be described more specifically with reference to the drawings.

  Here, in the accompanying drawings, the same members are denoted by the same reference numerals, and redundant description is omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

Example 1
FIG. 1 is a cross-sectional view of the self-priming pump according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the casing according to the first embodiment of the present invention, and FIG. 3 is a plan view of the casing partition plate according to the first embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes an electric motor. A casing 3 is attached to one side of the electric motor 1, and a rotating shaft 2 of the electric motor 1 is coupled to an impeller 6 in the casing 3. A pump chamber 9 is formed on the open side of the casing 3 by being coupled and sealed to the open side of the casing cover 4 via a partition plate 7 and a packing 8.

  In FIG. 3, the partition plate 7 is formed with a circulation hole 7a for a water flow passage at a predetermined position, a central circulation hole 7c, and a drain hole 7b at the lowermost end. The packing 8 has these circulation holes 7a and drain holes 7b. The water is prevented from leaking from the periphery of the central circulation hole 7c.

  In FIG. 2, an impeller 6 is accommodated in the impeller chamber 3 c of the casing 3. The rotating shaft 2 is protruded from the central portion of the impeller chamber 3c, and the impeller 6 is mounted with the mechanical seal 10 sandwiched between the tip portion and the electric motor 1 and the pump chamber 9 are sealed. Yes.

  The casing 3 has an impeller chamber 3c, and is provided with a discharge passage 3b through which water flows out from the impeller chamber 3c to the delivery tank portion 3a.

  As shown in FIG. 10, a suction passage 4 a communicating with the suction joint 11 and a water tank portion 4 c are formed in the casing cover 4. The suction passage 4 a communicates with the impeller chamber 3 c of the casing 3 through the central flow hole 7 c of the partition plate 7.

  The drainage joint 13 for draining the remaining water present in the pump chamber 9 is arranged not at the casing cover 4 but at the lowermost end of the casing 3.

  Next, the operation will be described. First, exhalation water is poured into the pump chamber 9 in advance. The injected water enters the impeller chamber 3c. Also, circulating water 46 is poured into the bathtub 45 from a faucet 44 in the bathroom.

  Next, when the electric motor 1 is driven, the impeller 6 in the impeller chamber 3c rotates. Then, the water in the impeller chamber 3c is stirred by the impeller 6, and at this time, bubbles are mixed into the water. The water mixed with air enters the delivery tank portion 3a through the discharge passage 3b, and further flows into the water tank portion 4c of the casing cover 4 through the flow hole 7d of the partition plate 7.

  An air / water separation chamber 4b is provided in the upper part of the water tank portion 4c in the casing cover 4, and water flowing out from the flow hole 7d of the partition plate 7 is separated into air and water in the air / water separation chamber 4b. The air is discharged from the discharge joint 12 through the heat exchanger 43 and the discharge pipe 42 into the bathtub 45 as indicated by an arrow C.

  On the other hand, the remaining water returns from the water tank portion 4 c to the impeller chamber 3 c of the casing 3 through the circulation hole 7 a of the partition plate 7 as indicated by an arrow D. That is, water circulates between the impeller chamber 3c and the water tank 4c, and only air flows out to the outside. When this state continues, the pressure gradually decreases in the central portion of the impeller chamber 3c and the suction passage 4a.

  And the circulating water 46 in the bathtub 45 is sucked up by the pressure difference between the pressure in the suction passage 4a and the outside. When the circulating water 46 flows into the suction passage 4a from the suction joint 11 through the suction pipe 41, a full-scale water supply state is entered, and the circulation operation is performed.

  The sucked circulating water 46 is heated by the heat exchanger 43, returns to the bathtub 45 through the discharge pipe 42, and is chased.

  When draining the remaining water in the pump chamber 9, when the drain plug 17 is opened, the remaining water in the suction passage 4a of the casing cover 4 flows into the impeller chamber 3c of the casing 3 through the central flow hole 7c of the partition plate. .

  Further, the remaining water in the water tank portion 4 c of the casing cover 4 flows into the impeller chamber 3 c of the casing 3 through the drain hole 7 b of the partition plate 7. A casing drain hole 3d is provided at the lower end of the casing bottom 3e and communicates with the drain joint 13.

  For this reason, the remaining water in the impeller chamber 3c can be discharged from the drainage joint 13 via the casing drainage hole 3d.

  In addition, about the arrangement | positioning position of the drainage coupling 13, it is also possible in the impeller chamber side surface 3f portion.

  The self-priming pump of the present invention can be expected to be applied to various pumps used in, for example, fuel cell devices and heat pump devices.

Cross section of self-priming pump according to Embodiment 1 of the present invention Casing plan view in Embodiment 1 of the present invention Casing partition plate plan view in Embodiment 1 of the present invention Cross-sectional view of a conventional self-priming pump Casing impeller plan view of conventional self-priming pump Casing partition plate plan view of conventional self-priming pump A plan view of a conventional self-priming pump viewed from the casing cover open side Schematic configuration diagram showing the state of use of conventional self-priming pumps Schematic configuration diagram showing the state of use of a self-priming pump mounted on a water heater with high functionality Plan view seen from the casing cover open side with the expiratory joint installed Motor drive structure diagram of casing cover mold with priming joint and screw type drainage joint Mold structure diagram of casing cover with expiratory fitting and no screw type drainage fitting

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Rotating shaft 3 Casing 3a Delivery tank part 3b Discharge passage 3c Impeller chamber 3f Impeller chamber side surface 4 Casing cover 4a Suction passage 4b Air-water separation chamber 4c Water tank part 6 Impeller 7 Partition plate 7a Circulation hole 7b Drain hole 7c Central flow hole 7d Flow hole 8 Packing 9 Pump chamber 10 Mechanical seal 11 Suction joint 12 Discharge joint 13 Drainage joint 14 Explosion joint 14a Tunnel flow channel 17 Drain plug 17a O-ring 20 Mold frame 21 Explosion slide pin 22 Motor 23 Main gear 24 Sub gear 25 Rotating slide pin 25a Slide pin thread 40 Water heater 41 Suction piping 42 Discharge piping 43 Heat exchanger 44 Faucet 45 Bath 46 Circulating water 47 Primary water supply piping 48 Solenoid valve 49 Circulating port

Claims (1)

An electric motor, an impeller driven by the electric motor to absorb and discharge water, an impeller chamber that houses the impeller, and a discharge passage through which water that has flowed out of the impeller chamber flows and flows out of the impeller chamber A casing having a delivery tank portion for receiving the discharged water, an air / water separation chamber communicating with the delivery tank portion, a water tank portion for storing exhalation water for sending a part of the water flowing into the impeller chamber, And a casing cover provided on a side surface of the pump, and a drainage joint for discharging water remaining in the pump chamber when the impeller is not driven is provided in the casing. Self-priming pump.

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