JP3363769B2 - Pump system with self-priming device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a centrifugal pump,
It relates pump system and a driving dynamic method comprises a pump having no self-priming force such as a gear pump.

[0002]

2. Description of the Related Art Centrifugal pumps and gear pumps have various advantages such as high liquid supply capability, low noise, durability and low cost, but have the drawback of not having self-priming capability. That is, as shown in FIG. 4, when the liquid tank 1 is lower than the position of the main pump (spiral pump) 2, liquid is not yet supplied to the inside of the main pump 2 at the start of operation, and thus the main pump 2 The operation cannot be started until the priming water 3 is injected inside. In addition, in order to prevent the priming water 3 and the liquid in the discharge pipe 4 from falling into the liquid tank 1 through the main pump 2 and the suction pipe 5 and being lost when the priming water 3 is injected or the operation is stopped for a long time. It was necessary to provide the foot valve 6 at the tip of the suction pipe 5.

[0003]

The conventional pump system described above has a problem in that the priming water and the tank for storing the priming water are required, which makes the system large in size.
Further, since the foot valve must be provided on the suction side of the pump, the suction load by the foot valve becomes large, and there is a problem that operating efficiency is reduced and cavitation occurs.

The present invention has been made in view of the above problems, and provides a pump system with a self-priming device which eliminates the need for priming water and a foot valve, a self-priming unit used for the pump system, and a method of starting the pump system. The purpose is to

[0005]

A pump system with a self-priming device according to the present invention comprises a main pump having no self-priming ability for transferring liquid, a main flow path connected to a liquid discharge side of the main pump, A self-priming unit provided in the main flow channel to supplement the self-priming ability of the main pump is provided, and the self-priming unit includes a check valve provided in the main channel and the check valve of the main channel. And a branch flow passage narrower than the main flow passage that branches from the upstream side and joins the main flow passage on the downstream side of the check valve, and a branch flow passage that is provided in the branch flow passage at the start of operation and the main flow passage.
A self-priming auxiliary pump that sucks up the liquid via the branch flow path and the main pump when the pump fails.

A pump unit according to the present invention is a self-priming unit that is provided on the liquid discharge side of a main pump that does not have the self-priming capability for transferring liquid and that supplements the self-priming capability of the main pump. A main flow path connected to the liquid discharge side of
A valve mechanism for preventing backflow inserted in the main channel, a branch channel provided so as to connect the inlet and the outlet of the valve mechanism and branched from the main channel, the branch channel being thinner than the main channel, and the branch flow. It is installed on the road at the start of operation and
A self-priming auxiliary pump that sucks up the liquid via the branch flow passage and the main pump when the pump fails.

Further, driving the dynamic process of self-priming device with a pump system according to the present invention, a valve mechanism for backflow prevention to the main channel of the liquid discharge side having no main pumping self-priming force provided for transferring liquid, In addition to providing a branch flow passage narrower than the main flow passage branched from the main flow passage so as to connect the inlet and the outlet of the valve mechanism, a self-priming auxiliary pump is provided in the branch flow passage, At the start of operation, prior to the start of operation of the main pump, liquid is sucked up by the self-priming auxiliary pump, and when the main pump is filled with liquid, the operation of the main pump is started , If the main pump fails, use the self-priming auxiliary pump
It is characterized in that it is made to operate .

According to the present invention, a self-priming unit is provided on the liquid discharge side of the main pump having no self-priming capability, and the self-priming unit is equipped with a self-priming auxiliary pump which supplements the self-priming capability of the main pump. Therefore, when the system is started up, the inside of the main pump can be filled with the liquid by sucking up the liquid through the branch portion branched from the main flow path by the self-priming auxiliary pump. After the inside of the main pump is filled with liquid, if the self-priming auxiliary pump is automatic, stop it and start the main pump to start normal operation.

According to the present invention, priming water becomes unnecessary,
The system configuration becomes simple. Further, since it is not a start-up method by priming, it is not necessary to provide a foot valve at the tip of the suction pipe of the main pump. This reduces the suction load on the main pump and prevents cavitation. The loss and drop of the liquid when the main pump is stopped can be effectively prevented by providing a backflow preventing valve mechanism in the main flow path on the discharge side of the main pump.

As the self-priming auxiliary pump,
If it has self-priming ability, it does not matter particularly the liquid feeding ability, and for example, a bellows pump, a diaphragm pump or the like can be used.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a pump system with a self-priming device according to an embodiment of the present invention. This pump system includes a main pump 11 composed of a spiral pump, a self-priming unit 12 connected to a discharge port 14 of the main pump 11, and a controller 1 for driving and controlling the main pump 11 and the self-priming unit 12.
3 and 3. Suction port 1 of main pump 11
A suction pipe 16 is connected to the suction pipe 5,
The tip of 6 is led to the liquid 18 in the liquid tank 17.

The self-priming unit 12 has a main pipe 21 which forms a main channel M connected to the discharge port 13 of the main pump 11.
A valve mechanism 22 connected to the discharge side of the main pipe 21, a bypass pipe 23 that forms a branch flow path B branched from the main pipe 21 to reach the valve mechanism 22, and inserted into the bypass pipe 23. Auxiliary pump 24 for self-priming
And is configured.

The valve mechanism 22 includes check valves (poppet valves) 31, 32 provided in two stages, and the check valves 31, 32.
A cylindrical body 33 that accommodates 32, a lock nut 34 that connects the cylindrical body 33 and the tip of the main pipe 21, a discharge pipe 35 that is connected to the discharge side of the cylindrical body 33, and the discharge pipe 35 and the cylindrical body 33.
It is composed of a lock nut 36 for connecting with.

The self-priming auxiliary pump 24 comprises a bellows pump, and includes a pump head 41 inserted into the bypass pipe 23, a bellows 42 connected to the pump head 41, and an actuator for driving the bellows 42. 43, a frame 44 that supports them, and a cover 45 that protects a motor portion (not shown) of the actuator 43. The pump head 41 is
Check valves (for example, poppet valves) 52 and 53 are respectively arranged on the suction port side and the discharge port side of the head main body 51 to guide the liquid therebetween to the bellows 42 side and to connect the bypass pipe 23 to the suction port side. Lock nut 54
And a lock nut 56 for connecting to the discharge pipe 55 on the discharge port side. And
The discharge pipe 55 is connected to the side surface of the cylindrical body 33 of the valve mechanism 22.

Next, the operation of the pump system with a self-priming device constructed as described above will be described. First, when the pump system is activated, the controller 13 activates the self-priming auxiliary pump 24. When the self-priming auxiliary pump 24 is activated, the reciprocating motion of the bellows 42 by the actuator 43 is started, and the liquid in the liquid tank 17 is sucked into the suction pipe 1.
6, main pump 11, main pipe 21, bypass pipe 2
3. It is introduced into the cylindrical body 33 of the valve mechanism 22 via the self-priming auxiliary pump 24. The liquid introduced into the cylindrical body 33 flows in the flow direction of the main flow path M through the check valve 32 and the discharge pipe 35, but flows in the reverse direction of the main flow path M due to the existence of the check valve 31. Absent.

The controller 13 uses the self-priming auxiliary pump 2
When a sensor (not shown) detects that the inside of the main pump 11 is filled with the liquid by the operation of No. 4, or when a timer measures a predetermined time, the operation of the self-priming auxiliary pump 24 is stopped, and the main pump 11 is stopped. 11 is started. This allows
The liquid in the liquid tank 17 is the suction pipe 16, the main pump 11,
The normal operation state in which the main pipe 21, the valve mechanism 22, and the discharge pipe 35 flow along the main flow path M is entered.

According to this system, by making the main pipe 21 thick and the bypass pipe 23 thin, even a self-priming auxiliary pump having a self-priming ability but a small liquid transporting ability can be quickly started. Since the main pump 11 that has no self-priming ability but has a high liquid transfer ability after the start-up transfers the liquid by the flow in the main flow path M, a large flow rate of liquid can be transferred. According to this system, priming water is unnecessary, and since the self-priming unit 12 is simply connected to the discharge side of the main pump 11, the system structure can be simplified. Further, since it is not necessary to provide a foot valve on the suction side of the main pump 11, maintenance is facilitated, suction load is reduced, and cavitation is prevented.

2 and 3 are diagrams showing the system and various modifications thereof. 2A is a schematic view of the system of FIG. 1, and FIG. 2B is a schematic view of valves 31, 32.
An example in which the bypass pipe 23 is branched from between and the auxiliary pump 24 for self-priming is provided therein, FIG.
In this example, 2 is omitted. In the example of FIGS. 2A to 2C, since the check valves 31 and 32 are provided in the main flow path M, it is possible to prevent the liquid from dropping and flowing out even during the operation stop period after the system is started. . In the example of FIGS. 2A and 2C, the bypass pipe 23 branches immediately after the discharge port of the main pump 11, so that the self-priming auxiliary pump 24 can be quickly started even if it has a low suction capacity. Is. The configuration of FIG.
Since the pump 24 performs suction operation via the check valve 31, the suction load increases, but this configuration is sufficient if the power of the pump 24 can be obtained to some extent.

Further, FIGS. 3D to 3F show the check valve 3
In the example in which a manual valve is used in place of 1, 32, the manual valve 61 is provided in the main pipe 21 and the manual valve 62 is provided in the bypass pipe 23 upstream of the self-priming auxiliary pump 24 in FIG. For example, the same figure (e) is an example in which the main pipe 21 is provided with a manual valve 61, and the bypass pipe 23 is provided with a manual valve 62 downstream of the self-priming auxiliary pump 24. When self-priming, the manual valve 61 is closed and the manual valve 62
Is open, and the valve is opened and closed so that the manual valve 61 is opened and the manual valve 62 is closed during normal operation. Same figure ( f )
Is an example in which the manual valve 62 is omitted. Also, if these manual valves 61, 62 are controlled by the controller as electromagnetic valves, automatic operation becomes possible.

FIG. 3 shows an example in which a bellows 71 which is a manual pump is used as a self-priming auxiliary pump. As in this example, by connecting only the bellows 71 to the branch portion from the main flow path M between the check valves 31 and 32 of the valve mechanism, the bellows 71 is expanded and contracted at startup to fill the main pump 11 with liquid. If the main pump is started later, a more compact system can be constructed. Needless to say, an automatic self-priming system can be constructed by driving the bellows 71 with an actuator 72 as shown by the dotted line in the figure. This example corresponds to an example in which the valve mechanism 22 of FIG. 1 and the pump head 41 of the self-priming auxiliary pump 24 are shared.

Of the above-mentioned examples, in the examples of FIGS. 2A and 3, the check valve 3 is provided on the discharge side of the self-priming auxiliary pumps 24, 71.
Since 2 exists, it is also effective in preventing pump damage due to a water hammer. Further, in the example of FIG. 2, the main pump 1
By operating the self-priming auxiliary pump 24 at the time of failure of No. 1, there is also an advantage that it is possible to send liquid though the self-priming unit 12 though the amount is very small.

The self-priming unit 12 is connected to the main pump 11
It is possible to install it on the suction side of, but in this case,
Since air remains in the suction port of the main pump 11, there is a possibility that the main pump 11 may entrap air, which is not preferable.
In the system described above, air does not remain on the suction side of the main pump 11, and the restart is smoothly performed.

[0023]

As described above, according to the present invention, priming water is unnecessary, the system configuration is simplified, and it is not necessary to provide a foot valve at the tip of the suction pipe of the main pump. The suction load is reduced and cavitation can be prevented from occurring.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a pump system with a self-priming device according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing various modified examples of the present invention.

FIG. 3 is a diagram schematically showing another embodiment of the present invention.

FIG. 4 is a diagram schematically showing a conventional pump system.

[Explanation of symbols]

1, 17 ... liquid tank, 2, 11 ... main pump, 3 ... priming water, 4
... Discharge pipe, 5,16 ... Suction pipe, 6 ... Foot valve,
12 ... Self-priming unit, 13 ... Controller, 21 ... Main pipe, 22 ... Valve mechanism, 23 ... Bypass pipe, 24
... Bellows pump, 31,32,52,53 ... Check valve,
42, 71 ... Bellows, 43, 72 ... Actuator,
61, 62 ... Manual valve.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-145710 (JP, A) JP-A-50-89902 (JP, A) JP-A-1-203696 (JP, A) Actual development Sho-64- 22893 (JP, U) Actually open 60-19795 (JP, U) Actually open 52-80101 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04D 9/00 F04D 13 / 12

Claims (3)

(57) [Claims] 1. A main pump having no self-priming ability for transferring liquid, a main channel connected to a liquid discharge side of the main pump, and a main channel provided in the main channel to supplement the self-priming ability of the main pump. A self-priming unit, wherein the self-priming unit branches from the upstream side of the check valve of the main flow path to the check valve of the main flow path, and branches from the check valve of the main flow path on the downstream side of the check valve. A branch flow passage that is narrower than the main flow passage that joins the passage, and is provided in the branch flow passage at the start of operation and the main pump
A self-priming pump system having a self-priming auxiliary pump that sucks liquid through the branch flow path and the main pump in the event of failure . 2. A self-priming unit for supplementing the self-priming ability of the main pump, the self-priming unit being provided on the liquid dispensing side of the main pump that does not have the self-priming ability for transferring liquid, and is connected to the liquid dispensing side of the main pump. A main flow path, a valve mechanism for preventing backflow inserted in the main flow path, and a branch flow narrower than the main flow path branching from the main flow path provided so as to connect the inlet and the outlet of the valve mechanism. And the main pump at the start of operation provided in this branch flow path
A self-priming unit for a pump, comprising: a self-priming auxiliary pump that sucks up liquid through the branch flow path and the main pump when the failure occurs. 3. A valve mechanism for preventing backflow is provided in a main flow passage on the liquid discharge side of a main pump that does not have a self-priming ability for transferring a liquid, and the main flow is such that an inlet and an outlet of the valve mechanism are connected to each other. A branch flow passage narrower than the main flow passage branched from the passage is provided, and a self-priming auxiliary pump is provided in this branch flow passage, and at the start of operation of the main pump, prior to the start of operation of the main pump, The liquid is sucked up by the suction auxiliary pump, and when the main pump is filled with the liquid, the operation of the main pump is started . When the main pump fails, the self-priming auxiliary pump is activated.
Driving the dynamic process of self-priming device with a pump being characterized in that so as to.