JP4949641B2 - Pumping adjustment mechanism in a small submersible pump - Google Patents

Description

  The present invention relates to a pumping adjustment mechanism in a small submersible pump, and more particularly to a pumping adjustment mechanism in a small submersible pump configured to be installed in a water tank provided in a fan for agriculture and livestock.

  Conventionally, in the submersible pump, the following prior art can be cited as an invention in which an air vent hole for connecting the outer periphery and the inner periphery is established at a place where air easily collects.

  Document (1) is a “submersible pump” disclosed in Japanese Patent Application Laid-Open No. 2003-286989. As pointed out in the column of problems in the prior art, the present invention is an air that cannot be exhausted above the impeller during pump operation. Caused an air lock and the pump did not pump up. And when it is used for sewage, filth, and miscellaneous drainage, there existed a fault which tends to produce the airlock. Therefore, the document (1) is configured so that the outer periphery and the inner periphery of the outer cylinder part are communicated with each other in the vicinity of the corner where the upper part of the outer cylinder part, which is the uppermost part of the annular space, intersects the upper partition wall Air is generated during operation by providing an air vent hole at the top of the annular space (the air vent hole is provided at the upper side where the air above the impeller of the mechanical seal cover of the submersible pump tends to accumulate) Adopts a configuration that prevents the pumping from being impossible by quickly being eliminated from the annular space without stagnation and avoiding an air lock.

  Document (2) is a “submersible pump” disclosed in Japanese Patent Application Laid-Open No. 2003-97485, and as pointed out in the column of the prior art and its problems, the present invention has an air valve structure protruding outward from the casing. The size of the water stop ball is limited due to space limitations, and the air outlet has a small diameter, so that foreign matter is blocked and the air bleeding function is easily impaired. Further, the structure in which only the air vent hole is opened without providing the air valve has a disadvantage that the pump performance is lowered. Therefore, this document (1) is to provide a submersible pump in which the air in the impeller housing chamber is effectively expelled and is not fouled by the discharged sewage. The point of the structure is an air valve chamber that is vertically installed from the inner periphery of the wall surface through the communication path inside the wall surface around the upper casing that serves as a storage chamber for accommodating the impeller inside. A configuration is adopted in which an air vent hole is formed in the center of the surface, and a baffle plate is provided for injecting air in a guided manner from above the opening surface of the air vent hole toward the outer periphery of the pump.

  Document (3) is a “submersible pump” disclosed in Japanese Patent Application Laid-Open No. 11-193791, and as pointed out in the column of problems in the prior art, this invention uses a manhole or a sewage relay for this type of submersible pump. To prevent the scum generated at the pumping station from accumulating, the pump stop water level is set to a low position corresponding to the lower end of the suction bell mouth, and the operation is continued until the suction water tank is almost empty. A lot is happening. However, when the pump is stopped, air enters the pump casing through the suction bell mouth and suction port, and a part of this air remains in the pump casing even if the water level rises to the operation start water level. There is a disadvantage that the operation becomes in a state and the inflow of water into the pump casing is hindered to cause an empty operation in which pumping is impossible at the time of restart at the operation start water level. Then, this literature (3) aims at providing the submersible pump which can ensure the discharge function of the air which entered the pump casing, and can avoid the occurrence of the idling which cannot pump up at the time of restart. It is said. The point of the structure is that the discharge passage is defined by a vertical curved pipe connecting the inlet on the pump casing side opened at a low position communicating with the spiral chamber and the outlet on the anti-pump casing side opened at a high position. The upper end level of the discharge passage is set at the height of the lower surface of the casing cover or the vicinity thereof, and the region from the upper end of the inlet to the lower surface of the casing cover or the vicinity thereof is set as a starting point at the upper end of the outlet. A configuration is adopted in which an air vent passage extending toward the inside is provided in communication with each of the discharge passage and the pump casing.

  Document (4) is a “submersible pump” disclosed in Japanese Patent Application Laid-Open No. 11-257273, and the present invention is substantially the same as the contents pointed out in the column of problems of the prior art of the document (3), The point is that in the submersible pump provided with an elastic seal ring for preventing solid foreign matter from entering the mechanical seal housing part, an air vent hole is provided in the casing cover above the elastic seal ring, and the impeller facing the casing cover is provided. A configuration is adopted in which a small gap is formed in the outer peripheral edge portion so that the inside of the pump casing communicates with the lower side of the elastic seal ring.

JP2003-286989 JP2003-97485 JP-A-11-193791 JP 11-257273 A

  The purpose of the documents (1) to (4) is as follows: “The water level rises to the operation start water level, an air lock state in which air remains in the pump casing, and prevents the inflow of water into the pump casing. It is intended to eliminate the “deficiency of generating an idle operation in which pumping is not possible at the time of restart at the operation water level”. Therefore, the present invention intends to “open a pumping adjustment hole in a small submersible pump and / or open an air escape hole to avoid impeller damage”. , For different purposes.

  An outline of the configurations of the documents (1) to (4) is as follows. First, the document (1) states that “an air vent hole is provided in the upper side portion where the air above the impeller of the mechanical seal cover of the submersible pump tends to accumulate. In addition, the document (2) is an air valve chamber that is vertically installed from the inner periphery of the wall surface through the communication path inside the wall surface around the upper casing serving as a storage chamber for storing the impeller inside. The air valve chamber has a configuration in which an air vent hole is opened at the center of the top surface of the air valve chamber. References (3) and (4) show that “the air vent passage is provided in communication with the discharge passage and the pump casing. In addition, the literature (4) describes that “the casing cover is provided with an air vent hole above the elastic seal ring, and the pump casing is communicated with the lower side of the elastic seal ring at a predetermined position. Small formed was the configuration of the gap "adopted for. Therefore, the present invention intends to “open a pumping adjustment hole in a small submersible pump in at least the discharge passage of the pump and / or open a hole for air escape to avoid breakage of the impeller, etc. This is a configuration provided with a “pumping adjustment mechanism in at least a small submersible pump”, which has a different purpose.

  The invention of claim 1 is intended to adjust the amount of pumped water discharged from the discharge passage or to avoid damage to the impeller by opening a pumping adjustment hole in a small submersible pump. The invention of claim 1 is intended to achieve driving of the impeller even in a use state in which the flow rate of the discharge passage and the piping is reduced. Furthermore, the invention of claim 1 is intended to avoid breakage of the impeller.

Claim 1 provides a main body case having a suction port with a watertight portion and a submerged portion, a drive portion is provided in the watertight portion, and a drive transmission portion that is driven by the drive portion in the submerged portion; An impeller that is rotated by the drive transmission unit is provided, and a discharge passage is provided in the main body case. The discharge passage is configured to be a flow path of water discharged from the impeller. And a pumping adjustment mechanism in a small submersible pump having a pumping adjustment hole in the pipe for the discharge passage ,
The discharge passage and the hole of the pipe for the discharge passage have a blind lid structure, and are a pumping adjustment mechanism in a small submersible pump configured to open the blind lid so that the hole is opened .

  The invention of claim 2 intends to clarify the field in which this kind of small submersible pump can be adopted by achieving the object of claim 1.

  A submersible pump according to a first aspect of the present invention is a pumping adjustment mechanism in a small submersible pump configured to be equipped in a water tank provided in a fan for agriculture or livestock.

According to the first aspect of the present invention, a watertight portion and a submerged portion are provided in a main body case having a suction port, a drive portion is provided in the watertight portion, a drive transmission portion driven by the drive portion is provided in the submerged portion, and a drive An impeller that rotates in the transmission section is provided, and a discharge passage is provided in the main body case. The discharge passage is structured to be a flow path of water discharged from the impeller, and the flow of water discharged from the impeller A pumping adjustment mechanism in a small submersible pump having a discharge passage serving as a passage, a discharge passage, and a hole for adjusting pumping in the pipe for the discharge passage ,
The discharge passage and the hole of the pipe for the discharge passage have a blind cover structure, and are a pumping adjustment mechanism in a small submersible pump configured to open the blind cover by opening the blind cover .

  Accordingly, the first aspect is characterized in that the amount of pumped water discharged from the discharge passage can be adjusted by opening a pumping adjustment hole in a small submersible pump, or the impeller can be prevented from being damaged. Further, claim 1 has an actual advantage that the driving of the impeller can be achieved even in a use state in which the discharge passage and the flow rate of the piping are reduced. Further, the first aspect has a feature that damage to the impeller 5 can be avoided.

  The invention of claim 2 is a pumping adjustment mechanism in a small submersible pump equipped in a water tank provided in a fan for agriculture and livestock production.

  Accordingly, the second aspect has a feature that the object of the first aspect can be achieved and a field in which this kind of small submersible pump can be adopted is clarified.

  An example of the present invention will be described.

  1 is a front view of a submersible pump, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a front view of FIG. 4, and FIG. 6 is an enlarged cross-sectional view of the water supply tank of the stirring fan of the agricultural fine fog cooling shown in FIG. 4.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a main body case including a suction port 2, and the main body case 1 includes a watertight portion 100 and a submerged portion 101. The watertight part 100 is provided with a magnet drive, a stator, etc. as an example of the drive part 3, and the drive transmission part 4 driven by the drive part 3 is provided in the flooded part 101. In addition, let this drive transmission part 4 be a rotating shaft, a rotor, etc., for example. The impeller 5 is secured to the rotating shaft. One of the chambers 6 for accommodating the impeller 5 is communicated with the suction port 2 and the other is communicated with the discharge passage 8.
Accordingly, the water sucked from the suction port 2 is sent to the discharge passage 8 via the impeller 5, and this submersible pump controls the rotation of the impeller 5 when pressure is applied to the discharge passage 8. Adjust the flow rate. It is a so-called submersible pump having a flow rate adjusting function.

  A pipe 10 is connected to the discharge passage 8 continuously. The discharge passage 8 and / or the pipe 10 is provided with a pumping adjustment hole 11, and the amount of pumped water discharged from the discharge passage 8 can be adjusted by discharging at least water from the hole 11, or There is a feature that damage to the impeller 5 can be avoided. In the configuration in which the hole 11 is opened only in the pipe 10, the amount of pumped water discharged from the discharge passage 8 can be adjusted without adding improvements to the conventional submersible pump, and it is simple and rational. There are features. Although not shown, this hole 11 has a blind lid structure, is opened when necessary, has a structure that can exhibit the above-described characteristics, can be used in the same manner as in the past, and can adjust the pumping amount precisely. There are features. The number of the holes 11 is arbitrary, and may be changed depending on the capacity, form, purpose, etc. of the discharge passage 8 and / or the submersible pump, for example. Moreover, it adjusts suitably as needed.

  4-6 is an example equipped with the submersible pump of this invention, It is the stirring fan 20 of the fine fog cooling for agriculture, Comprising: This stirring fan 20 and the casing 21 which exhibits the cylinder shape by opening back and forth (right and left) The motor 22 supported on the casing 21, the impeller 22 (stirring fan) and / or the diffusion disk 25 secured to the output shaft of the motor 22, and the water case 24 attached to the output side of the motor 22. A water injection pipe 26 that opens to the approximate center of the water case 24 and the disk 25; a pumping pipe 27 that is connected to the water injection pipe 26; and the casing 21 in which the pumping pipe 27 is provided. The water dripped from the water supply tank 30 and the water injection pipe 26 is atomized by the disk 25 for rotation and / or diffusion of the impeller 22 (stirring fan), and the excess water is used as the front. The return pipe 28 for feeding the water supply tank 30 to the main structure. The submersible pump according to the present invention is installed in the water supply tank 30, the suction port 2 of the submersible pump opens into the water supply tank 30, and the pipe 10 is connected to the pumping pipe 27. Accordingly, the water in the water supply tank 30 passes from the suction port 2 of the submersible pump via the pipe 10 to the pumping pipe 27 and / or the water injection pipe 26 of the agitating fan 20 from the pipe 10 and is atomized as described above. Is done.

  In the figure, 31 is a float, 32 is a water supply pipe, and 33 is a lid.

Figure 1 is a front view of the submersible pump 2 is a plan view of FIG. 3 is a cross-sectional view taken along line AA in FIG. Fig. 4 is a schematic cross-sectional view of a stirrer fan for agricultural fine fog cooling where a submersible pump is installed. 5 is a front view of FIG. 6 is an enlarged cross-sectional view of the water supply tank of the stirring fan of the agricultural fine fog cooling shown in FIG.

DESCRIPTION OF SYMBOLS 1 Main body case 100 Watertight part 101 Flooding part 2 Suction port 3 Drive part 4 Drive transmission part 5 Impeller 6 Chamber 8 Discharge passage 10 Piping 20 Casing 21 Motor 22 Impeller 24 Water case 25 Disk 26 Water injection pipe 27 Pumping pipe 28 Return Pipe 30 Water supply tank 31 Float 32 Water supply pipe 33 Lid

Claims (2)

A body case provided with a suction port is provided with a watertight portion and a submerged portion, a drive portion is provided in the watertight portion, a drive transmission portion that is driven by this drive portion, A rotating impeller is provided, and a discharge passage is provided in the main body case. The discharge passage is configured to be a flow path of water discharged from the impeller. The discharge passage and the discharge passage A pumping adjustment mechanism for a small submersible pump that has a hole for adjusting pumping in a pipe for use in the pump ,
A pumping adjustment mechanism in a small submersible pump in which the discharge passage and the hole of the pipe for the discharge passage have a blind lid structure, and the hole is opened by opening the blind lid .   The submersible pump according to claim 1 is a pumping adjustment mechanism in a small submersible pump configured to be installed in a water tank provided in a fan for agriculture or livestock.

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