JPH01390A - pump equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention houses a plurality of impellers in a pump casing, and switches the connection state of each impeller to a flow path between series and parallel.

(B) Conventional technology In the conventional technology described in Japanese Patent Publication No. 32-2887, which precedes the present invention, a plurality of impellers are housed in a pump casing, and when switching the impellers in series or parallel in a wave path, a large number of impellers are The on-off valve is engaged with an operating rod to operate it, but both the on-off valve and the operating rod are movable members, and there may be cases where power transmission between the two members is not achieved reliably. There is a risk of malfunction due to reasons such as .

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and allows the flow path to be switched reliably and easily without the need for a dedicated switching member.

(2) Means for Solving the Problems The present invention provides a method in which a plurality of suction I flow paths and a discharge side C flow path corresponding to each of a plurality of impellers are continuously formed in a pump casing and an auxiliary tank. , forming a selective flow path that selectively communicates the suction side wave path and the discharge side flow path in the welding head of the auxiliary tank, and changing the connection state of the impellers in series or parallel by switching the welding state of the welding head; This is to switch to .

(E) According to the present invention, when the welding state of the welding head is switched to the auxiliary tank, the selected flow path formed in the auxiliary tank is connected to the other suction side flow path and the discharge (MII flow path). Therefore, the plurality of impellers can be switched in series or in parallel with respect to the flow path.

(f) Examples Next, one embodiment of the present invention will be described.

In Figure 1, (1) is the suction side pipe inserted into the well, (2) is the check valve interposed in the suction side pipe (1), and (3)
is the pump, (4) is the motor as a drive source for the pump (3), and (5) is the opening/closing contact (6) for turning on/off the motor (4).
), (7) is a Hentury tube interposed in the discharge side conduit (8) of the pump (3), and has a high-pressure side detection path (9) and a low-pressure side detection path in its large diameter part and small diameter part, respectively. (10) is connected. (11) is a pressure condenser that communicates with both detection paths (9) and (10), and corresponds to the pressure of both detection paths (9) and (10).
12) and the pressure of the low pressure A-law output path (13),
The pressure switch (5) is opened and closed based on the differential pressure between the two output paths (12) and (13). (14) is the discharge side pipe (8)
The pressure tank (15) is a water faucet.

In Figure 2, (16) is the pressure condenser (11)
The first diaphragm chamber (17) is the second diaphragm chamber. The high pressure side (16B) and low pressure side (16L) of the first diaphragm chamber (16) are connected to both detection paths (9).
(1o). and a first diaphragm chamber (1
The high pressure side (1711) and low pressure side (16L) of the second diaphragm chamber (17) are connected to the high pressure side (511 (16H) and low pressure side (16L) of
17L) is communicating. (20) is the first diaphragm (
The first valve body installed in the high pressure side output path (12
) open and close. (22) is the first spring that presses the first valve body (20), (23) is the second diaphragm x, (24)
The second valve body attached to > opens and closes the low pressure side output path (13). (25) is the second valve that presses the second valve body (23).
The spring has a weaker spring coefficient than the first spring (22), as will be described later.

(26) is a third diaphragm chamber that is connected to the pressure switch (5), and the high pressure side (26B) and low pressure side (26L) are connected to the high pressure side output path (12) and the low pressure side output path (13), respectively.
are connected to each other. (27) is a rond attached to the third diaphragm (28), and the third spring (27) is attached to the third diaphragm (28).
9) to open the opening/closing contact (6).

In Figures 3, 4 and 5, <30) <31)
is a Unisph-type impeller installed in the pump (3),
0-car I〉・Bella (3) installed on the same rotating shaft (32)
0) (31) is fitted onto the rotating shaft (32) with a spacer (33) interposed between the two, and sequentially abuts against the retaining nut (34) screwed onto the rotating shaft (32), and is thrust. The position is restricted by direction. (35) is a pump casing, which includes a casing part (35a) and an intermediate casing part (35
b) and a part of the casing cover (35c) are connected by screws or the like. The casing portion (35a) accommodates a mechanical seal (36), and the mechanical seal (36) is sealed by being pressed against the insertion portion of the rotating shaft (32) by a compression spring (37). (38) is an auxiliary tank screwed to the upper part of the pump casing (35) via a packing (39), and is connected to each of the suction side pipe line (1) and the discharge side pipe line (8). (40)
(41). The suction side connection part (40) has a storage part (42) for the check valve (2). Storage section (
42) is closed by a lid body (44) that forms a locking portion for the pressing spring (43) of the check valve (2). (4
5) is a joining head which is screwed to the upper part of the auxiliary tank (38) via a gasket (46), and an opening/closing cap (47) for the priming water inlet is attached.

(48) is the first suction side flow path corresponding to the first impeller (30), and the water sucked in from the check valve (2) side is transferred to the auxiliary tank (
38) and the pump casing (35) to the first impeller (30). (49> is the first impeller (
30) in the first discharge side flow path corresponding to the first impeller (30).
0) is guided to the first discharge chamber (49a) of the auxiliary tank (38) via the pop casing (35). Auxiliary tank (38) in the first discharge chamber (49a)
The upper end opening (49b) is formed into a large square shape.

(50) is a second suction side flow path corresponding to the second impeller (31), and the water sucked in from the circular hole (50a) at the top of the auxiliary tank (38) passes through the pump casing (35) to the second suction side flow path.
Guide to impeller (31). (51) is a second discharge side flow path corresponding to the second impeller (31), and the water pushed out by the second impeller (31) is passed through the pump caning (35) through the circular hole (51a) at the top of the auxiliary tank (38). I will guide you to.

In FIG. 6, <52) (53) is the junction radius (
45) a selection flow path formed on the lower surface of the first and second suction side flow paths (48)<50) and the vJ1. 1st. The outlet flow path (49>(51)) is selectively communicated. In the bonding head (45), the bonding/\rad is connected to the auxiliary tank (38).
When it is joined to the upper part of the holder at the rotational angle position shown in Fig. 7,
One selection flow path (52) is connected to the first and second suction side flow paths (48).
) (50), and the other selection flow path (53) connects the first and second discharge side flow paths <49> (51), so that the first and second impellers (30) (31 ) are joined in parallel to each other with respect to the flow path. Further, in the welding head (45), the welding head is connected to the auxiliary tank (38).
When joined at the upper part of the 180° rotated position as shown in FIG. The other end of the second discharge side flow path (51) is separated from the circular hole (51a) and is closed by the upper wall, and the other selected flow path <
53> only communicates between the first discharge side flow path (49) and the second suction side flow path (50), so that the water in the pump flows between the first suction side flow path (48) and the second suction side flow path (50). 1 impeller (30) -
The flow passes through the first discharge side flow path <49> - the second suction side flow path (50) - the second impeller (31) - the second discharge side flow path (51), and therefore the first and second The impellers (30) and (31) are connected to each other in series with respect to the flow path.

In the pump device, when the pump device is stopped, as shown in FIG. 2(a), there is no flow in the venturi tube (7), so
The high pressure side detection path (9) and the low pressure side detection path (10) are at the same pressure, and the condenser (11) (7) and the first valve body (2
0) moves upward only by the pressing force of the first spring (22) and closes the high-pressure side output path (12), and this high-pressure side output path (12) is connected to the on-point pressure of the pump as described later. The third diaphragm (28) and rod (27) of the pressure cassette (5) are pushed up by the pressure in the low-pressure side output path (13) at the pump-off point, which is higher than the pressure at the on-point, and the contact (6) is off and the motor (4) is not energized.

When the pump device starts operating, the water faucet (15) is opened and the Venturi pipe (7) is opened, as shown in FIG. 2(b).
The internal pressure decreases, and this pressure decrease causes the low pressure side detection path (10
> and the pressure cass inch (5) via the low pressure side output path (13)
) on the low pressure side (26L) of the third diaphragm <28), and when this low pressure side (26L) reaches a pressure below the pump-on point, the high-pressure side (2
68), the third diaphragm (28) and the rod (
27) is pushed down and contact 6) is closed.

When the pump device has a large amount of water, as shown in Figure 2(c), a large pressure difference is created between the high pressure side detection path (9) and the low pressure side detection path (10) due to the large amount of water in the Venturi pipe (7). This pressure difference causes the first valve body (20) to be pushed down against the first spring (22), and the high pressure side output path (12)
This high-pressure side output path (12) communicates with the pump and becomes low pressure below the pump-on point at that time, but the low-pressure side output path (13) also opens after the pressure has sufficiently decreased below the pump-on point. Since the valve body (23) is held closed, the rod (27) of the pressure switch 5 is continuously deflected downward, and the contact (6) is closed.

In the pump device, when the flow rate of the pump is reduced from a large flow rate to a flow rate of the drop-on point, the high pressure side detection path (9) and the low pressure side detection path (10) are connected, as shown in Fig. 2(d). ) decreases, and this differential pressure causes the pressing force of the first spring (22) to increase, causing the first valve body (20) to close to the high pressure side output path (1
2) is closed to maintain the pressure at the pump-on point. At this pump-on point flow rate, the second spring (2
5) also decreases, but this second spring (25) has a smaller spring coefficient than the first spring (22), so it cannot resist the differential pressure like the first spring (22). It continues to be pushed downward together with the second valve body (25), so that the low-pressure side output path (13) is continuously closed and maintained at a low pressure below the pump-on point.

In the pump device, when the flow rate is further reduced from the flow rate at the pump-on point, the second spring (25) is also able to resist the further reduced differential pressure, as shown in FIG. 2(a). The second valve body (23) opens the low pressure side output path (13) to communicate with the pump, and in this communication state, when the faucet (15>) is further throttled and the fit amount is exhausted,
The high pressure inside the pump at that time acts on the low pressure side (26L) of the pressure switch (5), and this low ff:, side (26L)
The pressure becomes higher than the pump-on pressure in the holding state on the high pressure side (<26H), so the rod (27) is pushed up, the contact (6) is turned off, and the motor 4) is stopped.

In addition, in the pump device, the connection state of the impellers (30) and (31) can be switched in series or in parallel with the flow path by switching the connection state of the connection/\\rad 45) with respect to the auxiliary tank (38). As shown in Figure 9, the pump characteristics are as shown in the characteristic line (H2-Qt), where the total head increases in series connection operation compared to the characteristic line (Hl-Ql) for one impeller. , in the case of parallel connection operation, the characteristic line (
The flow rate increases as in Hl-Q2).

(G) Effects of the Invention Since the present invention is configured as described above, by simply switching the connection state of the welding head to the auxiliary tank, the connection state of a plurality of impellers to the flow path can be changed, and the impellers can be operated in series. It is now possible to easily switch between parallel operation and parallel operation with just one pump device.
It is possible to provide a pump device that can largely adjust the control range of flow characteristics. Further, switching between series operation and parallel operation can be easily and reliably performed by simply using a welding head provided in the apparatus, without requiring a complicated dedicated mechanism unlike the conventional example.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the present invention, with Figure 1 being an overall configuration diagram, Figure 2 being a vertical sectional view of a capacitor and pressure switch, Figure 3 being a vertical sectional front view, and Figure 4 being a vertical sectional view. is a longitudinal sectional side view of the pump, and FIG. 5(a) is an A-B- in FIG. 5(b).
5(b) is a top view of the auxiliary tank, FIG. 6(a) is a top view of the welding head, and FIG.
b) is a side view of the welding head, and FIG. 6(C) is a side view of the welding head.
A-B-C-D @ sectional view in a), FIG. 6(d) is a bottom view of the welding head, FIG. Figure 7 (b) is an explanatory diagram of the same, seen from the side, Figure 8 (a) is an explanatory diagram of the welding head seen from the top during series operation, and Figure 8 (b)
is an explanatory diagram of the same as seen from the side direction, and FIG. 9 is a characteristic diagram regarding the total head and flow rate. (30) (31)...impeller, (32)...times-
Rotating shaft, (35)...Pump casing, (38)...
・Auxiliary tank, <45)...Joining head, (48)(
50)...Suction side flow path, (49)(51)...Discharge side flow path, (52)(53)...Selection flow path.

Claims (1)

[Claims] 1) A plurality of impellers are mounted on the same rotating shaft, and a plurality of suction side channels and discharge side channels corresponding to each impeller are continuously formed in the pump casing and the auxiliary tank, and the auxiliary tank is A selective flow path is formed in the welding head to selectively communicate the suction side flow path and the discharge side flow path, and the connection state of the impellers is switched to series or parallel by switching the welding state of the welding head. Characteristic pump device.