JP2015143475A - Pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump system capable of ensuring stable water sealing performance and ensuring the water level of priming water.SOLUTION: A pump system including an impeller driven to rotate by a motor, a guide vane located to cover an outer circumference of the impeller and fixed to a synthetic resin casing having an outer shell for forming a pump chamber, and a synthetic resin cover fixedly attached watertight via an O-ring so as to cover the guide vane, and performing a vortex pump action by the rotation of a rotary shaft, comprises: a lift check valve; and an intake-side water passage provided in a front surface of the casing cover and including a lift-check-valve storage portion storing therein the lift check valve, the lift-check-valve storage portion having a check-valve water sealing surface, and the check-valve water sealing surface being located above an upper end of the impeller.

Description

  The present invention relates to a pump device.

  The material of the casing and casing cover of the pump device, including the turbine pump device, is becoming the mainstream from the conventional cast iron or gun metal to synthetic resin. Thereby, it has become possible to form a complicated shape at a low cost.

  Patent Document 1 describes a synthetic resin centrifugal pump provided with a pump casing made of a synthetic resin such as PPE resin. Patent Document 1 describes a valve seat and a valve body (swing check valve) configured to be seated on and away from the valve seat on the inner side end face of the flange fitting.

  Many turbine pump devices rely on cast articles for their outer shells such as casings, and generally have a structure that can be produced at low cost while avoiding complicated shapes and processing to ensure productivity.

  The check valve structure and suction-side water passage also employ simple mechanisms and shapes. Specifically, the check valve is swing-type, and the suction-side water passage is swing-type so that no complicated shape is required. A configuration in which a suction flange is connected so as to communicate with the vicinity of the upstream side of the check valve is generally known (Patent Document 1).

JP-A-7-243398

  In a turbine pump device that is mainly used in a low head environment, the swing check valve described in Patent Document 1 may not be able to obtain a sufficient negative pressure in the suction pipe. In addition, with the swing check valve, there is a risk that the water tightness of the valve seat surface may be insufficient due to scale adhesion due to long-term use, and stable water sealing cannot be ensured.

  In addition, the swing check valve described in Patent Document 1 has a check valve water sealing surface located below the upper end of the impeller, so that in the unlikely event that water leaks from the check valve, a priming water level is secured. You may not be able to do self-priming.

  An object of this invention is to provide the pump apparatus which can ensure the stable water-sealing property and can ensure a priming water level.

  In order to solve the problem, a guide vane that has an impeller that is rotationally driven by an electric motor, is positioned so as to cover the outer periphery of the impeller, and is fixed to a synthetic resin casing that forms a pump chamber by an outer shell. In addition, in a pump device in which a synthetic resin casing cover is fixed in a watertight manner through an O-ring so as to cover the guide vane and performs a spiral pump action by rotation of a rotating shaft, a lift check valve is provided. A suction side water passage having a lift check valve storage portion for storing the lift check valve on the front surface of the casing cover, and the lift check valve storage portion is provided with a check valve water sealing surface, The check valve water sealing surface is located above the upper end of the impeller.

  ADVANTAGE OF THE INVENTION According to this invention, the pump apparatus which can ensure the stable water-sealing property and can ensure a priming water level can be provided.

It is a perspective view in the state where pump cover 11 was removed from pump device 100 concerning the present invention. It is a longitudinal section of pump device 100 concerning the present invention. It is the fragmentary sectional view which showed the structure of the water storage wall and discharge side water channel | path which concern on this invention. It is a figure by the side of the casing cover of the casing 3 which concerns on this invention. It is a figure by the side of the electric motor of casing 3 concerning the present invention. It is a figure by the side of the electric motor of the casing cover 4 which concerns on this invention. It is the figure which attached the pump cover 11 to the pump apparatus 100 which concerns on this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Hereinafter, as shown in the figure, the vertical direction is defined with the base 5 side in the pump device 100 as a downward direction.

  FIG. 1 is a perspective view of the pump device 100 according to the present invention with the pump cover 11 removed. FIG. 2 is a longitudinal sectional view of the pump device 100 according to the present invention. FIG. 3 is a partial cross-sectional view showing the configuration of the water storage wall 25 and the discharge-side water passage 22 according to the present invention. FIG. 7 is a perspective view of the pump device 100 according to the present invention.

  The pump device 100 includes a base 5, a pump unit 101, a pressure tank 6, a pressure switch 7, and a pump cover 11.

  The base 5 is a substantially rectangular parallelepiped member. A pressure tank 6, a pressure switch 7, and a pump unit 101 are arranged side by side on the upper surface of the base 5, and are fixed to the upper surface of the base 5.

  The pressure tank 6 stores water pressurized by the pump unit 101.

  The pressure switch 7 controls the start / stop of the pump unit 101 according to the pressure value.

  The pump cover 11 is a substantially rectangular parallelepiped concave member having an open bottom surface and a part of the side surface. The pump cover 11 is detachable from the base 5. This is because the pump unit 101, the pressure tank 6, and the pressure switch 7 can be operated.

  The pump cover 11 is fixed to the base 5 so as to cover most of the pump unit 101 and all of the pressure tank 6 and the pressure switch 7 between the pump cover 11 and the base 5. The pump cover 11 can reduce the risk that sound generated from the pump unit 101 or the like is transmitted to the outside of the pump device 100. The opening on the side surface of the pump cover 11 is provided at the lower side of the side surface of the pump cover 11. As shown in FIG. 1, this can be realized because the suction flange 9 and the discharge flange 10 of the pump unit 101 are provided at the upper end of the base 5. Thereby, the opening area of the pump cover 11 is not increased so much, and the pump device 100 that realizes low noise can be provided.

  The pump unit 101 includes an electric motor 1, a casing 3, and a casing cover 4.

  The electric motor 1 has a rotating shaft 2 and an impeller 14. The impeller 14 is screwed to the pump chamber side of the casing 3 on the rotary shaft 2.

  The impeller 14 is rotationally driven by the electric motor 1 and applies speed and pressure to the pumped water by centrifugal force. The guide vane 15 efficiently guides the pumped water from the impeller 14 to the casing 3 that also serves as a pump chamber, and converts the speed energy of the pumped water into pressure energy.

  On the outer periphery of the impeller 14, the guide vane 15 is fixed to the casing 3 with screws or the like.

  FIG. 4 is a view of the casing cover side of the synthetic resin casing 3 according to the present invention. FIG. 5 is a view of the motor side of the synthetic resin casing 3 according to the present invention.

  The casing 3 is a substantially rectangular parallelepiped member having an opening on one surface.

  On the upper surface of the casing 3, there is a screw-type priming water supply plug 8. The priming water supply plug 8 is removed to perform priming water.

  A casing discharge port 20 is provided in the upper part of the rear surface of the casing 3. The casing discharge port 20 is an opening penetrating from the pump chamber side to the back side opposite to the pump chamber.

  A discharge-side water passage 22 that communicates with the casing discharge port 20 is provided on the back surface of the casing 3. The casing discharge port 20 and one end of the discharge side water passage 22 can be fixed in a watertight manner by the casing discharge port flange portion 21. In other words, the casing discharge port 20 is provided in an upper portion penetrating from the pump chamber to the back surface, the discharge flange portion 23 is fixed to the upper end of the base 5, and the discharge side water passage 22 communicating with the casing discharge port 20 on the back surface side of the casing 3. A discharge-side water passage 22 for constituting a water passage from the casing discharge port flange portion 21 to the discharge flange portion 23 that can be fixed in a watertight manner is connected. In this structure, the opening area of the pump cover 11 is small, and noise can be reduced. Furthermore, since the discharge-side water passage 22 is configured on the back side of the casing 3 in the same direction as the mounting surface of the electric motor 1, there is no increase in the height direction, and the width dimension of the discharge-side water passage portion 22 is also increased. Therefore, it is possible to reduce the size. Further, by configuring the casing discharge port 20 on the back side, even when the material of the casing 3 is made of synthetic resin, the mold does not require a slide structure and can be manufactured at low cost.

  In order to further reduce the size of the pump device 100, a bowl-shaped water storage wall 25 having only an upper surface opened (having an opening on the upper surface) is formed on the pump chamber side of the casing discharge port 20. The water storage wall upper end (opening of the water storage wall) 25a is configured above the casing discharge port lower end 20a, whereby the priming water level becomes the upper limit at the water storage wall upper end 25a, and water injection beyond that is to the discharge pipe. Flowing. In a structure in which the conventional partition wall 25 is not formed, the priming water level is the casing discharge port lower end 20a. That is, by forming the partition wall 25, the priming water level can be maintained above the casing discharge port lower end 20a, and the total casing height for L shown in FIG. 2 can be lowered (shown in FIG. 2). L is the height from the impeller upper end 14a to the check valve water seal surface 12a).

  The priming water level has a great influence on the self-priming performance. Since negative pressure is generated at the inlet of the impeller 14 during self-priming, the priming water gradually flows back to the suction pipe while gradually decreasing. When the water level drops to the vicinity of the upper end 14a of the impeller, the self-priming action stops, so that the casing 3 needs to store the reduced amount of water due to the backward flow, and the casing 3 cannot be easily reduced in size.

  According to the present embodiment, the water storage wall 25 can reduce the overall height of the casing 3 by L as shown in FIG. 3 while securing the priming water level. Further, the water storage wall 25 is on the back surface of the casing discharge port 20, and if the material is made of synthetic resin, a mold slide mechanism is not required and can be easily formed.

  In addition, when using a synthetic resin for the material of the casing 3 so as to ensure strength and relatively little deformation at the time of applying pressure, the function can be further secured by using a glass-containing material of 10 to 30%.

  The casing cover 4 includes a suction flange 9, a casing cover main portion 4a, and a casing cover pipe portion 4b. The casing cover 4 is made of synthetic resin, so that the cost is reduced.

  The casing cover main portion 4a is a substantially rectangular parallelepiped member having an opening on one surface. The casing cover main portion 4a forms a pump chamber between the casing 3 and the casing 3 by fixing an opening of the casing cover main portion 4a and an opening of the casing 3 described later.

  The casing cover tube portion 4b is a tubular member, and is provided on the front surface of the casing cover main portion 4a opposite to the pump chamber side. One end of the casing cover tube portion 4b communicates with the suction flange 9, and the other end communicates with the pump chamber.

  The casing cover pipe portion 4 b is a part of the suction side water passage 13. The casing cover pipe portion 4 b is provided with a lift check valve storage portion 29 that stores the lift check valve 12. The lift check valve storage portion 29 has a check valve water sealing surface 12a. The check valve water sealing surface 12a is a portion that comes into contact with the lift check valve 12, and can make it possible to obtain water sealing performance. A check valve cap 26 is attached to the lift check valve storage portion 29.

  By constructing the check valve water sealing surface 12a so as to be positioned above the impeller upper end 14a, which is the upper end of the impeller 14, the self-priming is performed without priming again even when water leaks from the lift check valve 12. Possible priming water level can be secured. That is, as shown in FIG. 2, a priming water level capable of self-priming can be secured by configuring L> 0.

  A suction flange portion 28 is provided at the lower front portion of the casing cover 4. The suction flange 9 can be attached to the suction flange portion 28. The opening area of the pump cover 11 can be kept to a minimum by directly below the suction flange portion 28 being the upper end of the base 5, and the pump operation noise can be suppressed.

  The reason for adopting the lift check valve 12 structure is as follows. As mentioned above, turbine pumps that are mainly used in a low head environment often do not provide sufficient negative pressure in the suction pipe. In contrast to the tightness of the valve seat surface and stable water sealing, the lift check valve 12 is higher due to the weight of the lift check valve 12 piece in addition to the pressure contact of the valve seat surface caused by the back flow of fluid. This is because water sealability is obtained.

  In addition, although it becomes cheap by manufacturing the casing cover 4 with synthetic resin, there exists a possibility that the following problems may arise. In the casing cover 4, the suction side water passage 13 from the suction flange portion 28 through the lift check valve storage portion 29 to the impeller inlet 14 b needs to have a hairpin shape. It is difficult to form the cover 4 integrally.

  In the present embodiment, a partition for separating the suction-side water passage 13 and the pump chamber in the casing 3 is formed, and the suction-side water passage from the downstream of the lift check valve storage portion 29 to the impeller inlet 14b. A partition plate 17 for forming 13 is screwed to the back surface of the casing cover 4. A hairpin shape can be formed by separately providing the partition plate 17 and screwing it.

  Further, the synthetic resin casing cover 4 may be deformed by the pressure increase in the pump chamber. However, since the tightening margin of the O-ring 16 must be secured, the box shape increases the strength. In order to suppress deformation, a plurality of reinforcing ribs 18 are formed inside. However, the arrangement of the reinforcing ribs 18 is in a direction perpendicular to the direction of the spiral generated by the rotation of the impeller 14, and thus becomes a resistance and may become a noise source due to a decrease in pumping performance or disturbance of running water.

  FIG. 6 is a view on the motor side of the casing cover 4 according to the present invention. In the present embodiment, a flat surface is formed on the partition plate 17 so as to cover the entire surface of the reinforcing rib 18 provided on the back surface of the casing cover 4. The partition plate 17 is screwed to the back surface of the casing cover 4 with screws 19 so as to be parallel to the spiral direction generated by the rotation of the impeller 14. Since the partition plate 17 is configured to be planar and parallel to the spiral direction in which the impeller 14 is generated, a rectifying action can be obtained. Furthermore, in addition to the performance improvement by the above-mentioned rectifying action, the partition plate 17 itself has an effect of sound insulation, and therefore, it is effective in reducing the flowing sound that becomes a noise source and the driving sound of the electric motor 1.

  That is, the partition plate 17 is configured to be flat and parallel to the effect of the partition for separating the suction-side water passage 13 and the pump chamber in the casing 3, and the spiral direction generated by the impeller 14, and the rectifying action is performed. There are three effects: the effect to be obtained, and the effect of the sound insulation board.

  The suction flange 9 is a portion that serves as a suction port for pumped water, and is located at an upper end portion of the base 5.

  Further, as shown in FIG. 2, a lift check valve 12 for preventing the backflow of the pumped water is housed in the casing cover tube portion 4b. The suction flange 9 is provided at the lower part of the casing cover 4.

  Next, storage of the lift check valve 12 will be described.

  The lift check valve 12 is stored in the lift check valve storage portion 29 of the casing cover 4. After the lift check valve 12 is stored, the check valve cap 26 is directly attached to the lift check valve storage portion 29 and the upper surface via an O-ring. The check valve cap 26 includes a check valve cap guide portion 27 that also serves as a guide that allows the lift check valve 12 to slide in the height direction. The check valve cap 26 is provided with a connection screw that can be connected to the casing cover 4. By providing a connection screw, a complicated mold structure is not required and can be manufactured at low cost, and a check can be performed without removing the casing cover 4 or the like for maintenance in the event of a malfunction such as the check valve 12 being caught. There is an effect that it can be dealt with only by attaching and detaching the valve cap 26.

Moreover, since the check valve water sealing surface 12a is configured above the impeller upper end 14a, that is, L> 0, priming after maintenance is not required.
When the power is turned on and the pump device 100 is operated, the pumped water is sent out from the discharge pipe (not shown) through the discharge flange 10. When the flow path connected to the discharge pipe (not shown) is closed, the downstream pressure increases from the discharge pipe (not shown). Normally, the pressure switch 7 or the like is activated and the electric motor 1 is stopped.

  In addition, when using a synthetic resin for the casing 3 and the casing cover 4 material, when a glass-containing material of 10 to 30% is used, there is an effect that strength is ensured and deformation at the time of applying pressure is relatively small.

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Rotating shaft 3 Casing 4 Casing cover 4a Casing cover main part 4b Casing cover pipe part 5 Base 6 Pressure tank 7 Pressure switch 8 Nozzle supply tap 9 Suction flange 10 Discharge flange 11 Pump cover 12 Lift check valve 12a Lift reverse valve Stop valve water sealing surface 13 Suction side water passage 14 Impeller 14a Impeller upper end 14b Impeller inlet 15 Guide vane 16 O-ring 17 Partition plate 18 Reinforcement rib 19 Screw 20 Casing discharge port 20a Casing discharge port lower end 21 Casing discharge port flange 22 Discharge side water passage 23 Discharge flange portion 25 Water storage wall 25a Water storage wall upper end 26 Check valve cap 27 Check valve cap guide portion 28 Suction flange portion 29 Check valve storage portion 100 Pump device 101 Pump portion

Claims (5)

A guide vane that has an impeller that is driven to rotate by an electric motor, that is positioned so as to cover the outer periphery of the impeller and that is fixed to a synthetic resin casing that forms a pump chamber on the outer shell; In a pump device in which a casing cover made of a synthetic resin is fixed in a watertight manner via an O-ring so as to cover a spiral pump action by rotation of a rotating shaft,
Equipped with a lift check valve,
A suction side water passage having a lift check valve storage portion for storing the lift check valve on the front surface of the casing cover;
A pump device characterized in that a check valve water seal surface is provided in the lift check valve storage portion, and the check valve water seal surface is located above the upper end of the impeller. The pump device according to claim 1,
A partition for separating the suction-side water passage of the casing cover and the pump chamber in the casing is formed, and a suction-side water passage from the downstream of the lift check valve storage portion to the impeller inlet is formed. A pump device characterized in that a partition plate for fixing is fixed to the back surface of the casing cover. The pump device according to claim 1 or 2,
A flat surface is formed on the partition plate so as to entirely cover the reinforcing rib provided on the back surface of the casing cover, and the flat surface is arranged so as to be parallel to a spiral direction generated by the rotation of the impeller. A pump device characterized by being fixed to the back surface of the pump. The pump device according to claim 1 or 2,
2. A pump apparatus according to claim 1, further comprising a suction flange portion to which a suction flange for screwing a pipe connected to a water source can be attached to a lower front portion of the casing cover. The pump device according to claim 1 or 2,
After the lift check valve is stored in the check valve storage portion, a check valve cap that also serves as a guide that allows the lift check valve to slide in the height direction is attached to the casing cover via an O-ring. A pump device characterized by being directly attached to the upper surface of the check valve storage portion.