JPH06307353A - Rotary type pump - Google Patents

Abstract

PURPOSE:To provide selectivity for the connection place of a piping at the time of execution of works, facilitate laying of a piping system in accordance with the situation of the site of installation, and allow well response to various uses widely. CONSTITUTION:A rotary pump has a pump casing 1, which is internally fitted with rotors 3, 5 so that the suction side and discharge side lie separately on the two sides when the pump is put in operation, and a drive shaft 12 to drive these rotors 3, 5 is installed on one side of this pump closing 1 while a casing cover 31 is installed on the other side of the casing 1. The pump casing 1 is furnished with the first port 10 to be in communication with one side of the rotors 3, 5 and the second port 11 in communication to the other side, and the casing cover 31 is provided with a third port 34 which is in communication to either side of the rotors 3, 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rotary pumps such as trochoid pumps and gear pumps.

[0002]

2. Description of the Related Art A rotary type pump having a rotary body for operating a pump inside a pump casing includes a trochoid pump,
There are gear pumps, vane pumps, and others. In this type of rotary pump, conventionally, a pump casing is provided with a suction port and a discharge port, respectively, and a pump action during rotation of a rotating body sucks fluid from the suction port side to the outside from the discharge port side. It is designed to discharge.

[0003]

The conventional rotary pump has the following drawbacks because the pump casing is provided with only one inlet and one outlet. That is, since there is only one suction port and one discharge port, if the installation position of the pump is restricted, or if there is another obstacle near either the suction port or the discharge port, the suction port Alternatively, it is necessary to bend the pipe connected to the discharge port near the pump. For this reason, it goes without saying that the construction of the piping system is troublesome, and there is a problem that the pipe resistance increases due to the bending of the piping.

Further, when two different kinds of fluids are simultaneously sucked and mixed and discharged, or when the fluids are divided into two systems on the discharge side and supplied to the next process, the conventional pump has a suction port and a discharge port of the pump casing. Since there is only one outlet,
It is necessary to connect a branch pipe to the outside, which makes the construction troublesome. Moreover, if the fluid has a particularly high viscosity, the
Since it is practically very difficult to evenly inhale different kinds of fluids at the same time and mix them in the pump, their use is naturally limited.

The present invention has been made in view of such conventional problems.
An object of the present invention is to provide a rotary pump capable of appropriately selecting a connection point of a pipe at the time of construction, easily constructing a piping system according to the situation of an installation site, and widely applicable to various uses.

[0006]

According to a first aspect of the present invention, a rotating body is provided in a pump casing 1 so that a suction side and a discharge side are separated from each other when the pump is operated by rotation.
In the rotary pump in which 3,5 are installed, the drive shaft 12 for driving the rotating bodies 3,5 is provided on one side of the pump casing 1, and the casing cover 31 is attached on the other side of the pump casing 1. The casing 1 has a first port 10 communicating with one side of the rotating bodies 3, 5 and a second port 11 communicating with the other side thereof.
And the casing cover 31 is provided with the third port 34 communicating with either one of the both sides of the rotating bodies 3, 5.

Further, the present invention according to claim 2 is directed to the suction port 41.
A rotary body 3, 5 for pump operation is provided inside a pump casing 1 having a discharge port 42 and a discharge shaft 42, and a drive shaft 12 for driving the rotary body 3, 5 is provided on one side of the pump casing 1. In the rotary pump in which the casing cover 31 is attached to the other side of the casing 1, the casing cover 31
Is provided with an escape passage 44 communicating with the suction side of the rotating bodies 3, 5 and a discharge port 43 communicating with the discharge side.The discharge port 44 and the discharge port 43 are provided between the discharge passage 43 and the discharge port when the pressure on the discharge side rises. A safety valve 45 is provided so as to allow the fluid to escape from the 43 side to the passage 44 side.

[0008]

According to the first aspect of the present invention, when the rotating bodies 3 and 5 are normally rotated by the drive shaft 12, the first port 10 side becomes the suction port, and the second port 11 and the third port 34 are the discharge ports. Becomes Therefore, the fluid can be sucked from the first port 10 side by the pump operation of the rotating bodies 3 and 5, and can be discharged in two systems from the second port 11 and the third port 34.

When the drive shaft 12 is rotated in the reverse direction, the second port 11 and the third port 34 become the suction port, and the first port 10 becomes the discharge side.
Therefore, two different fluids can be sucked and mixed from the second port 11 and the third port 34, and then discharged from the first port 10. Further, since either one of the intake port and the discharge port becomes two due to the forward / reverse rotation of the drive shaft 12, when only one intake port or one discharge port is required, the pipe connection may be made according to the situation of the installation site. It is possible to select any place.

According to the second aspect of the present invention, since the casing cover 31 has another discharge port 43 in addition to the suction port 41 and the discharge port 42 of the pump casing 1, the fluid sucked from the suction port 41 is discharged. The discharge can be divided into two systems from the outlets 42, 43, and either one of them can be selected and used according to the installation site. Further, since the safety valve 45 is provided between the discharge port 43 of the casing cover 31 and the escape passage 44, if the pressure on the discharge side increases, the fluid can escape from the discharge side to the suction side via the safety valve 45.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 5 show a first embodiment in which the present invention is applied to a trochoid pump. 1 to 4, reference numeral 1 denotes a pump casing made of stainless steel, cast iron or the like, and a mounting base 2 is integrally provided on the lower side thereof.

Reference numeral 3 denotes an outer rotating body, which is rotatably mounted inside the recess 4 of the pump casing 1. 5 is the inner rotating body,
It is rotatably fitted inside the outer rotating body 3. The rotors 3 and 5 are both made of a synthetic resin such as zircon, and the inner teeth 6 and the outer teeth 7 are formed, and they rotate relatively in the recess 4 of the pump casing 1 while meshing with each other. Then, the pump is operated.

In the pump casing 1, the suction side and the discharge side of the pump operation are divided into both sides when the rotating bodies 3 and 5 are rotated, so that the first passage is provided so as to correspond to both sides of the rotating bodies 3 and 5, respectively. 8 and the second passage 9 are formed in an arc shape, and the first port 10 and the second port 11 communicating with each of the passages 8 and 9 are formed on both sides of the pump casing 1 in the diametrical direction. Has been done.

The passages 8 and 9 are formed so as to open toward the concave portion 4 of the pump casing 1, and the ports 10 and 11 are formed so as to open to the outside of the pump casing 1 and the opening end side thereof. Further, female screws 10a, 11a are formed so that a pipe joint or the like can be detachably screwed.

A drive shaft 12 is inserted into the pump casing 1 from one side opposite to the rotating bodies 3 and 5. Drive shaft 12
Is rotatably supported by a bearing case 15 via ball bearings 13 and 14, and the bearing case 15 is detachably attached to one side of the pump casing 1 by a bolt 16.

The drive shaft 12 has a fitting portion 17 having a flat cross section and a substantially oval cross section on the inner end side. The fitting portion 17 is inserted into a substantially oval hole 18 of the inner rotor 5. It is inserted freely.
Further, a pulley 19 is keyed to the outer end of the drive shaft 12, and the drive shaft 12 is normally or reversely rotated by an electric motor via the pulley 19.

A mechanical seal 20 has a seal ring 21 and a rotary ring 22, as shown in FIG. The seal ring 21 is detachably interposed between the pump casing 1 and the bearing case 15, and the cushion rings 23 and 24 are interposed between the seal ring 21 and the pump casing 1 and the bearing case 15, respectively. Has been done.

The rotating ring 22 is a recess in the pump casing 1.
It is fitted onto the outer periphery of the drive shaft 12 within 25 via a packing 26. Sliding rings 27 and 28 that slidably contact with each other are fitted to the opposing ends of the seal ring 21 and the rotating ring 22, respectively. Rotating ring 22 is stopper ring 29
Is urged toward the seal ring 21 side by a spring 30 interposed between and. The stopper ring 29 is detachably fixed to the drive shaft 12.

Reference numeral 31 denotes a casing cover, which is detachably mounted on the pump casing 1 on the side opposite to the bearing case 15 with bolts 32. The casing cover 31 includes a protruding portion 33 that protrudes outward, and a third port 34 is formed in the protruding portion 33. The third port 34 is the second passage of the pump casing 1.
9 has an arcuate opening 35 facing the concave portion 4 side opposite to 9, and a female screw 34a is formed on the outer opening end side. A pipe 37 is connected to the female screw 34a via a removable flow control valve 36. The flow rate adjusting valve 36 has an adjusting lever 38.

In the trochoid pump having the above structure, for example, if the drive shaft 12 is normally rotated by an electric motor,
As a result, the inner rotor 5 and the outer rotor 3 rotate in the forward rotation direction. Therefore, the first port 10 side of the pump casing 1 serves as a suction port, and the second port 11 of the pump casing 1 and the third port 34 of the casing cover 31 both serve as discharge ports. Therefore, the fluid is sucked into the pump casing 1 from the first port 10 side by the pump operation accompanying the relative rotation of the two rotating bodies 3 and 5, and the fluid is discharged from both the second port 11 and the third port 34. be able to.

Therefore, when it is necessary to discharge the fluid by dividing it into two systems, a pipe is connected to the second port 11 and
If a pipe 37 is connected to the third port 34, it is possible to separately discharge into two systems on the discharge side. At this time, if the flow rate on the side of the third port 34 is adjusted by the flow rate control valve 36, the second port 11 and the third port 34
The distribution amount of the fluid discharged from the mouth 34 can also be changed arbitrarily.

When the drive shaft 12 is rotated in the reverse direction, the second port 11 and the third port 34 become the suction port, and the first port 10 becomes the discharge port. Therefore, it is also possible to suck two different fluids from the second port 11 and the third port 34, mix the two fluids in the pump, and then discharge the mixed fluid from the first port 10 to supply it to the next process. It is possible.

Further, in the case where only one suction port and one discharge port are required, if the rotation direction of the drive shaft 12 and the installation direction of the pump are changed, the connecting point of the pipe is appropriately selected according to the situation of the installation site. Therefore, the trouble of bending the pipe in the vicinity of the pump is eliminated, the construction of the pipe and the like becomes very easy, and the problem of the conduit resistance can be solved.

For example, when used in the normal rotation state, the second port 11
Since the outlet and the third outlet 34 become outlets, if there is an obstacle or the like on the outlet side, connect the outlet side piping to the second outlet 11 and the third outlet 34 according to the situation of the installation site. You can select either Also, if used in reverse, the second port 11 and the third port 34
Since it becomes an intake port, even if there is an obstacle on the intake side, select either 2nd port 11 or 3rd port 34 depending on the installation site situation and the connection point of the suction side pipe. it can. In addition,
Of the second port 11 and the third port 34, the ports on the unused side may be closed with a blind plug or the like.

At the time of maintenance, if the bolt 16 is removed, the drive shaft 12 can be withdrawn in the axial direction from the pump casing 1 and the inner rotor 5 in the recess 4 thereof. At this time,
The mechanical seal 20 can be withdrawn from the pump casing 1 integrally with the drive shaft 12 while being fitted in the outer periphery of the drive shaft 12.

When the bolt 32 is removed, the casing cover
Since 31 is removed, the rotating bodies 3 and 5 can be removed from the recess 4 of the pump casing 1. Therefore, there is an advantage that disassembly and assembly are very easy and maintenance is easy.

FIG. 6 illustrates a second embodiment of the present invention. The casing cover 31 is provided with a protrusion 39 that is substantially symmetrical to the protrusion 33. The protrusion 39 is provided with a fourth mouth similar to the third mouth 34.
40 are provided.

In this way, since there are two suction ports and two discharge ports, different fluids can be mixed in the pump and then divided into two systems on the discharge side to be supplied to the next step. If there are other obstacles on both the suction port and the discharge port, you can select either of the two suction ports and the discharge port to connect the pipes. Greater freedom of choice.

7 to 9 illustrate a third embodiment of the present invention. This trochoid pump is of the normal rotation type only, and the configuration on the pump casing 1 side is the same as that of the first embodiment. The pump casing 1 is provided with an intake port 41 and a discharge port 42.

The casing cover 31 is provided with another discharge port 43, and an escape passage 44 is formed corresponding to the suction side of the rotating bodies 3 and 5. Further, between the discharge port 43 and the escape passage 44, a safety valve 45 for allowing a part of the fluid to escape from the discharge port 43 side to the escape passage 44 side when the pressure on the discharge port 43 side rises is interposed. There is. The safety valve 45 includes a ball-shaped valve body 47 that opens and closes the flow path 46, and a spring 48 that biases the valve body 47 in the closing direction. 49 is a cap that also serves as a spring receiver.

Also in this case, since there are two discharge ports 42 and 43, the fluid can be discharged from both of them, and either one of them can be selected and used according to the installation site. it can. Moreover, since there is a safety valve 45, if the pressure on the discharge side rises, the valve body 47 is opened against the spring 48 and the flow path
Since the fluid can escape from the discharge side to the suction side via 46, an abnormal pressure rise on the discharge side can be prevented, and the safety is remarkably improved.

In each of the embodiments, the trochoid pump has been mainly described, but the present invention is not limited to this, and needless to say, the same can be applied to a rotary pump such as a gear pump.

[0033]

According to the present invention as set forth in claim 1, the rotating bodies 3 and 5 are provided in the pump casing 1 so that the suction side and the discharge side are separated on both sides when the pump is operated by rotation. A drive shaft 12 for driving the rotating bodies 3 and 5 is provided on one side of the pump casing 1, and the pump casing 1
In a rotary pump in which a casing cover 31 is mounted on the other side, the pump casing 1 is provided with a first port 10 communicating with one side of the rotating bodies 3, 5 and a second port 11 communicating with the other side, and the casing Since the cover 31 is provided with the third port 34 communicating with either one of both sides of the rotating bodies 3, 5, the rotating bodies 3, 5
The second port that sucked the fluid from the first port 10 side by the pump operation of
It is possible to separately discharge from 11 and the third port 34 into two systems, and also to discharge from the first port 10 after sucking and mixing two different kinds of fluids from the second port 11 and the third port 34. In addition, since either one of the suction port and the discharge port becomes two due to the forward / reverse rotation of the drive shaft 12, when only one suction port or one discharge port is required, the piping can be changed according to the situation of the installation site. It is possible to select either of the connection points.

Therefore, at the time of construction, there is an advantage that the connection portion of the suction side or the discharge side pipe can be appropriately selected, the piping system can be easily constructed according to the situation of the installation site, and various applications can be widely applied.

Furthermore, since the third port 34 is provided on the casing cover 31 on the side opposite to the drive shaft 12 for driving the rotating bodies 3 and 5, the third port 34 is provided on the pump casing 1 side as compared with the case where it is provided on the pump casing 1. There is an advantage that the basic structure does not need to be significantly changed and can be implemented very easily with a slight design change.

According to the second aspect of the present invention, the pump casing 1 having the suction port 41 and the discharge port 42 is internally provided with the rotating bodies 3 and 5 for pump operation.
The drive shaft 12 for driving the rotating bodies 3, 5 is provided on one side of the pump casing 1, and the casing cover 3 is provided on the other side of the pump casing 1.
In the rotary pump equipped with 1, the casing cover 3
1 has an escape passage 44 communicating with the suction side of the rotating bodies 3 and 5 and a discharge port 43 communicating with the discharge side.
It is possible to discharge the fluid inhaled from the outlets 42, 43 separately into 2 systems, and the outlets 42, 43 can be discharged according to the installation site.
It is also possible to select and use any one of the above.

Moreover, since the safety valve 45 is interposed between the escape passage 44 and the discharge port 43 so as to allow the fluid to escape from the discharge port 43 side to the escape passage 44 side, when the pressure on the discharge side rises. Since the fluid can be released from the discharge side to the suction side through the safety valve 45, the safety is remarkably improved.

Further, since the other discharge port 43 and the safety valve 45 are provided on the casing cover 31 on the side opposite to the drive shaft 12 which drives the rotating bodies 3 and 5, as compared with the case where they are provided on the pump casing 1, There is no need to significantly change the basic structure of the pump casing 1 side, and there is an advantage that it can be implemented very easily with a slight design change.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a trochoid pump showing a first embodiment of the present invention.

FIG. 2 is a front sectional view of the trochoid pump showing the first embodiment of the present invention.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a view taken along the line BB of FIG.

FIG. 5 is a cross-sectional view of a seal portion showing the first embodiment of the present invention.

FIG. 6 is a plan sectional view of a trochoid pump showing a second embodiment of the present invention.

FIG. 7 is a plan sectional view of a trochoid pump showing a third embodiment of the present invention.

FIG. 8 is a front sectional view of a trochoid pump showing a third embodiment of the present invention.

FIG. 9 is a view taken along the line CC of FIG.

[Explanation of symbols]

 1 Pump casing 3,5 Rotating body 10 1st port 11 2nd port 12 Drive shaft 31 Casing cover 34 3rd port 41 Suction port 42 Discharge port 43 Discharge port 44 Relief passage 45 Safety valve

Claims (2)

[Claims] 1. A rotary body (3) (5) is provided inside the pump casing (1) so that the suction side and the discharge side are separated on both sides when the pump is operated by rotation, and one of the pump casing (1) is A rotary shaft having a drive shaft (12) for driving the rotating bodies (3), (5) on the side and a casing cover (31) mounted on the other side of the pump casing (1). ), The first port communicating with one side of the rotating body (3) (5)
(10) and a second port (11) communicating with the other side are provided, and a third port (34) communicating with either side of the rotating bodies (3), (5) is provided in the casing cover (31). A rotary pump characterized by being provided. 2. A pump casing (1) having a suction port (41) and a discharge port (42) is internally provided with a rotating body (3) (5) for pump operation, and one side of the pump casing (1). In this rotating body (3)
In a rotary pump in which a drive shaft (12) for driving (5) is provided and a casing cover (31) is mounted on the other side of the pump casing (1), the casing cover (31) has a rotating body.
(3) An escape passage (44) communicating with the suction side of (5) and a discharge port (43) communicating with the discharge side are provided, and discharge is provided between the escape passage (44) and the discharge port (43). The rotary pump (45) is characterized in that a safety valve (45) is interposed so as to allow the fluid to escape to the escape passage (44) side from the discharge port (43) side when the pressure on the side increases.