JP6185052B2 - Rotary positive displacement pump - Google Patents

Description

  The present invention relates to a rotary positive displacement pump such as a gear pump that rotates while the volume of a fluid transfer space is changed by movement in a rotational direction.

  Conventionally, for example, a gear pump is known as this type of rotary positive displacement pump. This gear pump is located in the gap between the rotationally driven pinion (driving gear) and the internal gear (driven gear) that meshes with the pinion and drives the pinion, and separates the suction side from the discharge side. The space formed between the pinion and the internal gear rotates and moves as the pinion rotates, and the meshing state of the two changes to change the volume. The positive displacement pump is formed by introducing a transfer fluid into this space, transferring it in the rotational direction, and discharging it. When the rotary positive displacement pump described in Patent Document 1 is used, gas lock can be prevented without requiring an air venting operation even when handling a volatile transfer fluid.

Patent 3494213

  In general, in a rotary displacement pump, the transfer path needs to be filled when the pump is started in order to prevent bearing wear. For this reason, the rotary displacement pump described in Patent Document 1 requires a starting operation in which the gear pump is driven at a low speed by an inverter and gradually fills up. It was. Moreover, since the transfer fluid circulates in the rear casing via the gear pump, the temperature of the transfer fluid may increase.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a rotary positive displacement pump that can be quickly started and does not cause a rise in temperature of a transfer fluid.

  The rotary displacement pump according to the present invention has a suction port and a discharge port for a transfer fluid, introduces the transfer fluid to the inside through the suction port, and rotates the internal space with a volume change in the rotation direction. A pump main body that discharges the transfer fluid from the discharge port by moving, a first port that communicates with the suction port of the pump main body, and a second port that communicates with the discharge port of the pump main body and discharges the transfer fluid. Rotational capacity provided with a port housing having a port and a rotational drive mechanism in which a rotary body that gives rotational drive force to cause pump operation to the pump body and is connected to the pump body is housed inside the rear casing In the pump, the port housing includes a first suction passage that communicates from the first port to the rear casing, and a second suction that communicates from the rear casing to the suction port of the pump body. It has a road, the first port, the first suction passage, is characterized in that in communication with the suction inlet of the pump body via the internal and the second suction passage of the casing.

  According to the rotary displacement pump of the present invention, the internal space of the rear casing is interposed in the flow path of the transfer fluid from the first port for introducing the transfer fluid to the suction port of the pump body. Without depending on the pump operation of the main body, the transfer fluid can be directly introduced into the interior of the rear casing from the first port by the pressure of the tank. For this reason, a quick start is possible. Further, since the transfer fluid is structured to flow from the rear casing side to the pump main body side, the temperature of the transfer fluid does not increase.

  In one embodiment of the present invention, the port housing is arranged between the pump body and the rear casing. According to such an arrangement structure, the overall length of the pump can be shortened.

  The port housing may include a filter for filtering the transfer fluid between at least one of the first suction flow path and the rear casing and between the rear casing and the second suction flow path. In this case, it is possible to effectively prevent foreign matter from being mixed regardless of the use environment of the positive displacement pump, thereby preventing damage to the pump. Further, by removing the rear casing from the pump body, it is possible to perform maintenance such as filter replacement or cleaning relatively easily.

  The port housing has a vertically extending gas separation part whose lower end communicates with the first suction flow path, the lower end of the gas separation part, the first suction flow path, the second suction flow path, and Of the suction port of the pump body, it is preferable that the lower end of the gas separation unit is disposed at the top. When the rotary positive displacement pump is configured in this way, for example, when transferring a volatile transfer fluid, it is possible to effectively exhaust the gas generated in the suction port and the casing from the gas separation unit. . Here, for example, when the piping resistance on the suction side is high, the water surface is lowered in the gas separation unit, and a gas such as air is mixed into the discharged transfer fluid through the inside of the casing and the pump body. You might also say that. However, in this embodiment, such a situation can be prevented by the check valve.

It is sectional drawing seen from the side of the rotary positive displacement pump which concerns on 1st embodiment of this invention. It is a front view which cuts and shows a part of same rotary pump with the same positive displacement pump. It is a top view which shows the filter of the positive displacement pump.

  Hereinafter, a rotary positive displacement pump according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First embodiment]
[overall structure]
FIG. 1 is a cross-sectional view of the rotary positive displacement pump according to the first embodiment of the present invention as seen from the side, and FIG. 2 is a front view showing a part of the rotary positive displacement pump.

  The rotary positive displacement pump according to the present embodiment has a magnet driven rotary drive mechanism 1 and a suction port and a discharge port for the transfer fluid, and introduces the transfer fluid into the inside through the suction port. And a pump head 2 that transports a transport fluid to a discharge port and discharges it by moving the internal space with a change in volume in the rotational direction by the rotational motion transmitted from the head.

[Rotation drive mechanism 1]
The rotary drive mechanism 1 includes a bracket 11 formed with a fixing portion 11a capable of fixing a rotary positive displacement pump to a floor surface or the like. Inside the bracket 11 is accommodated a cylindrical rotary drive body 12 driven by a motor via a drive shaft (not shown). The rotary drive 12 supports a ring-shaped drive magnet 121 inside the open end. Further, the proximal end side of the rear casing 13 is accommodated inside the rotary drive body 12. A rotating body 14 that rotates in accordance with the rotational movement of the rotary drive body 12 is accommodated in the rear casing 13. The rotating body 14 is magnetically coupled to the ring-shaped magnet 121, and a driven magnet 141 that transmits the rotational motion of the motor described above via the rotary driving body 12, a magnet can 142 that houses the driven magnet 141 inside, and a magnet And a rotating shaft 143 attached to the can 142.

[Pump head 2]
The pump head 2 includes a pump body 21, a port housing 22 that supports the pump body 21, and a cover 23 that houses the pump body 21 together with the port housing 22. In the present embodiment, a first port 24A and a second port 24B project from the both side surfaces of the port housing 22, respectively, and a third port 24C projects from the upper surface.

[Pump body 21]
The pump body 21 includes a drive gear 211 that is rotationally driven by a rotary shaft 143, a driven gear 212 that meshes with the drive gear 211 in an eccentric state and is driven by the drive gear 211, and a gap between the drive gear 211 and the driven gear 212. A crescent-shaped guide body 213 that is positioned and separates the suction side and the discharge side. The drive gear 211, the driven gear 212, and the guide body 213 are in contact with the housing 22 through the side plate 214 and the gasket 215. A shaft hole 21a through which the shaft of the rotating body 14 is inserted is formed at the center of the side plate 214 and the gasket 215, and a suction port 21b for the transfer fluid and a discharge port 21c for the transfer fluid are formed outside the shaft hole 21a. A bearing 216 is fitted on the outer side of the driven gear 212, and the outer side and front side thereof are covered with a gear housing 217. In this embodiment, the guide body 213 is formed integrally with the gear housing 217, but may be formed integrally with the side plate 214 or may be formed independently. In the present embodiment, the pump body 21 is configured as described above. However, the pump body has a suction port and a discharge port for the transfer fluid, and the transfer fluid is introduced into the inside through the suction port and rotated. What is necessary is just to discharge the transfer fluid from the discharge port by moving the internal space with the volume change in the rotation direction by the operation. Therefore, the pump body does not have a crescent-shaped guide body, for example, a trochoidal internal displacement pump, external displacement pump, or all rotary displacement pumps with different principles such as vane displacement pumps. It can be employed as the main body 21.

[Port housing 22]
A shaft hole 22 a is formed in the center of the front surface of the port housing 22 to hold the rotating shaft 143 via a bearing 25 so as to be rotatable. A gear housing fitting portion 22b into which the pump body 21 can be fitted is formed outside the shaft hole 22a, and a flange 22c is further formed outside thereof. A portion corresponding to the suction port 21b of the gear housing fitting portion 22b is provided with a second suction flow path 22d communicating with the back surface of the gear housing 22, and corresponds to the discharge port 21c of the gear housing fitting portion 22b. A discharge passage 22e communicating with one side surface of the gear housing 22 is bored in the portion to be performed.

  The shaft hole 22a communicates with the center of the rear surface of the port housing 22, a wall surface 22f facing the inside of the rear casing 13 is formed on the outer side, and a flange 22g is formed on the outer side. . The lowermost portion of the wall surface 22f communicates with the second suction channel 22d. A first suction flow path 22h communicating with the upper surface and other side surfaces of the port housing 22 is bored at the uppermost portion of the wall surface 22f. Further, the rear casing 13 is attached to the flange 22g so as to keep the inside in a watertight / airtight state. The bracket 11 is attached to a further outer portion of the flange 22g. In addition, when transferring a non-volatile transfer fluid using a rotary positive displacement pump, the suction flow path 22h only needs to communicate with the other side surface, and communicate with the upper surface of the port housing 22. It is not necessary.

[First port 24A, second port 24B, and third port 24C]
The first port 24A is formed with a first suction channel 24Aa communicating with the first suction channel 22h described above, and a flange 24Ab is attached to the tip of the first port 24A. The second port 24B is formed with a discharge flow path 24Ba communicating with the above-described discharge flow path 22e, and a flange 24Bb is also attached to the tip of the second port 24B. Further, a gas separation part 24Ca is formed inside the third port 24C, and the gas separation part 24Ca has a lower end communicating with the first suction flow path 22h and the first suction flow path 24Aa. It extends in the vertical direction and opens upward. The gas separation unit 24Ca is provided with a check valve 24Cb. A flange 24Cc is attached to the tip of the third port 24C. Note that the third port 24C is not necessary when transferring a non-volatile transfer fluid using a rotary positive displacement pump.

[Filter 26]
In the present embodiment, as shown in FIG. 1, a filter 26 is fitted to the wall surface 22 f on the back surface of the port housing 22. As shown in FIG. 3, the filter 26 includes a first filter 262 that can remove foreign matters of the transfer fluid transferred from the outer frame 261 and the first suction path 22 h to the inside of the rear casing 13, and a second filter from the inside of the rear casing 13. A second filter 263 capable of removing foreign substances in the transfer fluid transferred to the suction flow path 22b. As a result, it is possible to provide a rotary positive displacement pump that is excellent in environmental resistance and is less likely to fail. Further, by removing the rear casing 13 from the port housing 22, maintenance such as replacement or cleaning of the filter 26 can be performed relatively easily. The filter 26 is formed in an annular shape so as not to block the shaft hole 22a and the interior of the rear casing 13. In this embodiment, in order to improve the performance of the filter, filtering is performed on both the transfer fluid transferred to the rear casing 13 and the transfer fluid discharged from the rear casing 13. It is also possible to filter either one. Further, the filter 26 may not be provided depending on the operating environment of the rotary positive displacement pump.

[Operation]
Next, the operation of the rotary positive displacement pump according to the present embodiment will be described.

  First, prior to starting, the transfer fluid is introduced from the tank to the first port 24A, and the transfer fluid is supplied into the rear casing 13 via the first suction flow path 24Aa, and the interior of the rear casing 13 is filled with water. State.

  Next, when the rotary drive body 12 is driven by a drive shaft (not shown), the rotary body 14 is driven via the ring-shaped magnet 121 and the driven magnet 141 that are magnetically coupled. Since the rotating body 14 is connected to the driving gear 211 via the rotating shaft 143, the driving gear 211 rotates, and the driven gear 212 meshed with the driving gear 211 in an eccentric state rotates. Accordingly, of the space formed by the drive gear 211, the driven gear 212, and the guide body 213, the volume of the portion exposed to the inside of the rear casing 13 through the suction port 21b and the second suction flow path 22d is as follows. In order to increase, the transfer fluid inside the rear casing 13 is sucked into the space. The sucked transfer fluid is transferred to the discharge port 21c by the rotational movement of the drive gear 211 and the driven gear 212. Further, since the volume of the portion exposed to the discharge port 21c in the space formed by the drive gear 211, the driven gear 212, and the guide body 213 is reduced, the transferred transfer fluid is discharged from the discharge port 21c and the discharge channel. 22e is discharged.

  As the transfer operation proceeds, the transfer fluid is supplied into the rear casing 13 through the first suction flow path 24Aa and the first suction flow path 22h. The transfer fluid transferred into the rear casing 13 follows the same path as the transfer fluid existing in the rear casing 13, and is discharged through the discharge flow path 22e.

  That is, in the rotary positive displacement pump according to the present embodiment, the rear casing can be easily filled with water in advance, so that quick start is possible. Further, since the transfer fluid is also filled in the boundary portion between the port housing 22 and the shaft portion of the rotating body 14, the bearing 25 can be lubricated without preparing a reflux path for preventing the wear of the bearing 25. It is possible to prevent the temperature of the transfer fluid from rising. In addition, the structure is such that the fluid is directly fed into the rear casing 13 and drawn from the pump side, so that the rear casing can be cleaned well and can be applied to sanitary applications and fluids containing slurry. is there.

  Further, even when the transfer fluid has volatility, the gas generated in the first suction flow path 22h and the rear casing 13 is discharged from the gas separation unit 24Ca, so that the problem of gas lock does not occur. . Further, for example, when the piping resistance of the first suction flow path 22h is high, the water surface is lowered in the gas separation portion 24Ca, and air or the like is transferred to the transported fluid discharged through the interior of the rear casing 13 and the pump head 2. It is thought that this gas will be mixed. However, in the present embodiment, such a situation can be prevented by the check valve 24Cb.

  In addition, the rotary positive displacement pump according to the present embodiment can be used by switching the suction direction and the discharge direction by rotating the motor in the reverse direction. In this case, the position of the filter 26 can be changed to protect the pump main body 21. However, it is limited to the discharge pressure within the rear casing pressure resistance.

  In summary, the first pump has a suction port and a discharge port for the transfer fluid, introduces the transfer fluid to the inside through the suction port, and rotates the internal space with a volume change in the rotation direction. A pump main body that discharges the transfer fluid from the discharge port by moving, a first port that communicates with the suction port of the pump main body, and a second port that communicates with the discharge port of the pump main body and discharges the transfer fluid. Rotational capacity provided with a port housing having a port and a rotational drive mechanism in which a rotary body that gives rotational drive force to cause pump operation to the pump body and is connected to the pump body is housed inside the rear casing The port housing includes a first suction flow path that communicates from the first port to the rear casing, and a second suction flow that communicates from the rear casing to the suction port of the pump body. It has a first port, the first suction passage, in which is in communication with the suction inlet of the pump body via the internal and the second suction passage of the casing.

  The second pump has a suction port and a discharge port for the transfer fluid. The pump body introduces the transfer fluid to the inside through the suction port and discharges the transfer fluid from the discharge port, and the suction port of the pump body. A port housing having a first port for introducing a transfer fluid and a second port for discharging the transfer fluid in communication with a discharge port of the pump body, and a driving force for causing pump operation to the pump body In the pump including the drive mechanism, the port housing includes a first suction passage that communicates from the first port to the rear casing, and a second suction passage that communicates from the rear casing to the suction port of the pump body. And the first port communicates with the suction port of the pump body via the first suction flow path, the inside of the casing and the second suction flow path, and the port housing includes the first suction flow path and the rear casing In which further comprising a filter for filtering the transferred fluid to at least one of between and between the rear casing and the second suction passage.

  The third pump has a suction port and a discharge port for the transfer fluid. The pump body introduces the transfer fluid into the inside through the suction port and discharges the transfer fluid from the discharge port, and the suction port of the pump body. A port housing having a first port communicating with the suction passage and introducing a transfer fluid and a second port communicating with the discharge port of the pump body and discharging the transfer fluid, and causing the pump body to perform a pump operation In the pump having a driving mechanism for applying a driving force for the gas, the port housing is formed with a gas separation portion having a vertically extending portion, the lower end of the gas separation portion communicates with the first port, and the suction The flow path communicates with the gas separation unit above the suction port of the pump body, and the gas separation unit has a check valve provided therein.

  DESCRIPTION OF SYMBOLS 1 ... Rotation drive mechanism, 2 ... Pump head, 11 ... Bracket, 12 ... Rotation drive body, 13 ... Rear casing, 14 ... Rotation body, 21 ... Pump main body, 22 ... Port housing, 23 ... Cover, 24A ... 1st Port, 24B ... Second port, 24C ... Third port, 25 ... Bearing, 26 ... Filter, 121 ... Ring magnet, 141 ... Drive magnet, 142 ... Magnetic can, 143 ... Rotary shaft, 211 ... Drive gear, 212 ... driven gear, 213 ... guide body, 214 ... side plate, 215 ... gasket, 216 ... bearing, 217 ... housing.

Claims (4)

A suction port and a discharge port for the transfer fluid; the transfer fluid is introduced into the interior through the suction port, and the internal fluid is moved in the rotational direction with a volume change by a rotation operation; A pump body that discharges from a discharge port;
A port housing including a first port communicating with the suction port of the pump body and introducing the transfer fluid and a second port communicating with the discharge port of the pump body and discharging the transfer fluid;
The rotary volume product pump having a rotating body the rotation driving force imparted coupled to the pump body and rotary drive mechanism accommodated in the interior of the rear casing for generating a pumping action in the pump body,
The port housing is disposed between the pump body and the rear casing, and communicates from the first port to the rear casing, and from the rear casing to the suction port of the pump body. A second suction channel that
The first port communicates with the suction port of the pump body through the first suction flow path, the inside of the casing, and the second suction flow path. pump.   A suction port and a discharge port for the transfer fluid; the transfer fluid is introduced into the interior through the suction port, and the internal fluid is moved in the rotational direction with a volume change by a rotation operation; A pump body that discharges from a discharge port;
  A port housing including a first port communicating with the suction port of the pump body and introducing the transfer fluid and a second port communicating with the discharge port of the pump body and discharging the transfer fluid;
  A rotation driving mechanism that applies a rotation driving force for causing pump operation to the pump body, and a rotating body connected to the pump body is housed in a rear casing;
  In a rotary positive displacement pump with
  The port housing includes a first suction channel that communicates with the rear casing from the first port, a second suction channel that communicates with the suction port of the pump body from the rear casing, and the first A gas separation part having a lower end communicating with the suction channel and extending vertically,
  The first port communicates with the suction port of the pump body via the first suction flow path, the inside of the casing and the second suction flow path,
  Of the lower end of the gas separation unit, the first suction channel, the second suction channel, and the suction port of the pump body, the lower end of the gas separation unit is disposed at the top.
  A rotary positive displacement pump characterized by that.   It further has a check valve provided in the gas separation part.
  The rotary positive displacement pump according to claim 2. The port housing includes a filter that filters the transfer fluid between at least one of the first suction flow path and the rear casing and between the rear casing and the second suction flow path. The rotary positive displacement pump according to any one of claims 1 to 3 .

Images