JPS6229762Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an energy-saving system that can collect high-temperature, high-pressure condensate generated by steam-based thermal equipment into a high-pressure location such as a boiler with low power and stable operation. This invention relates to a piston pump type condensate recovery pump device.

In general, methods for effectively utilizing condensate heat include utilizing low-pressure steam in a flash tank, recovering heat from condensate using a heat exchanger, and using a combination of an electric condensate pump and an ejector. Various methods have been proposed, including one in which the waste is recovered in a boiler or the like.

However, if a circulation circuit is provided for condensate recovery using a combination of an electric condensate pump and an ejector, the condensate recovery device in this circulation circuit will be operated regardless of the amount of condensate recovered; Combined with the low efficiency of the pump, this results in a large waste of power, which poses a problem from an energy efficiency perspective.Furthermore, in order to handle high temperature and high pressure condensate, there is a problem with the lifespan of the pump's mechanical seal, and cooling water is required. There is also a problem in that the device is expensive as a whole, and has various other drawbacks.

In order to eliminate this drawback, float-type condensate boosters using steam or compressed air as the driving source are commercially available, but these devices are not used when the condensate is exposed to atmospheric pressure. Because of this, high temperature and high pressure condensate cannot be recovered.
Further, when the drive source for driving this device is steam, the steam is released into the atmosphere, resulting in large heat loss, which has the disadvantage that it cannot function satisfactorily as a condensate recovery device.

The present invention eliminates the drawbacks of the conventional condensate recovery equipment as described above, and has a simple structure and energy-saving effect by using the small amount of steam or compressed air present in the steam system to drive high-temperature, high-pressure condensate. This invention relates to a condensate recovery pump device with high performance.

That is, the present invention includes a driving cylinder in which a driving piston driven by a driving gas consisting of steam or compressed air is made to move back and forth, and a compartment formed with the driving cylinder, and a driving piston and a piston rod. A piston pump consisting of a condensate cylinder that is connected to the condensate piston that sucks and pumps condensate and is reciprocated, and a piston pump that is fixed to the drive piston or the condensate piston when the drive piston moves to near the vertical dead center. A switching device consisting of a driving gas main switching valve that changes the flow path of the driving gas supplied to the driving cylinder by being switched by the driving gas supplied via the driving gas auxiliary switching valve that is switched by a driven gas rod. and a control tank for supplying condensate to a condensate cylinder of a piston pump.

Hereinafter, embodiments of the condensate recovery pump device according to the present invention will be described in detail with reference to the drawings.

Figure 1 shows one of the condensate recovery pump devices according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the drive gas sub-switching valve in FIG. 1, and FIG. 3 is an embodiment of a steam system equipped with a condensate recovery pump device according to the present invention. It is a diagram.

In the drawing, A is a piston pump, and the driving piston 2 of this piston pump A is operated by steam provided slightly outside the top dead center and bottom dead center of the driving piston 2 in the driving cylinder 1. Alternatively, the driving gas is supplied from the driving gas inlets 6 and 7 made of compressed air, and the driving gas is provided slightly inside the top dead center and bottom dead center of the driving piston 2 in the driving cylinder 1, respectively. The driving gas is alternately discharged from the outlets 8 and 9, thereby reciprocating. Further, a condensate cylinder 3 which is a compartment with the drive cylinder 1 is provided at the lower part of the drive cylinder 1 of this piston pump A, and a condensate piston 4 in this condensate cylinder 3 and a drive cylinder Driving piston 2 in cylinder 1
Both pistons 2 and 4 are connected by a piston rod 5 so as to be interlocked, and this piston rod 5 connects the driving cylinder 1 and the condensing cylinder 3.
The part that penetrates the space between is the amorphous packing 1.
Sealed by 0. This irregularly shaped packing 10 is supplied to the partition wall so that even if it leaks from the seal part of the partition wall into the driving cylinder 1 or the condensing cylinder 3 during long-term use, it can be easily replenished without disassembling the main body of the device. If the structure is such that the packing adjuster 11 is screwed onto a female screw threaded into the packing supply path, the irregular-shaped packing 10 can be replenished by simply tightening the packing adjuster 11 periodically. . In addition, the condensate cylinder 3 is provided with condensate inlets 12, 13 and outlets 14, 15 on the outside of the top dead center and bottom dead center of the condensate piston 4, respectively. Moving driving piston 2
Condensate is alternately sucked in and pumped by the reciprocating movement of the condensate piston 4 in conjunction with the condensate piston 4. The volume of the condensate cylinder 3 is determined by the condensate recovery capacity, and the area ratio between the condensate piston 4 and the driving piston 2 is determined by the degree of pressure increase of the condensate and the suction inside the driving cylinder 1. It may be determined based on the exhaust pressure difference. B is a switching device, which includes a drive gas sub-switching valve 16 which is switched when the drive piston 2 moves to near the vertical dead center by a rod 17 fixed to the drive piston 2 or the condensing piston 4; The flow path of the driving gas to the driving gas inlets 6 and 7 of the driving cylinder 1 is changed alternately by being switched by the driving gas supplied through the gas sub-switching valve 16, and the driving cylinder 1 is driven. The driving gas main switching valve 28 alternately changes the flow path of the driving gas from the outlets 8 and 9 to the driving gas, and the driving gas sub-switching valve 16 is configured to switch between the driving cylinder 1 or the condensate gas. The auxiliary switching valve cylinder 20 forms a compartment with the cylinder 3, and the rod 17 is fixed to the driving piston 2 or the condensing piston 4 (driving piston 2 in the illustrated embodiment) and moves together with the driving piston 2. It consists of a sub-switching valve body 19 whose position is moved when the driving piston 2 moves to near the vertical dead center, and a sub-switching valve cylinder 20 and the driving cylinder 1 or the condensing piston 3.
The penetrating portion of the rod 17 in the partition between the drive cylinder 1 and the drive cylinder 1 in the illustrated embodiment is sealed by an irregularly shaped packing 18. That is,
The auxiliary switching valve cylinder 20 has a driving gas inlet 21 at the center of the side, and communication ports 2 above and below the center of the side.
4 and 25, driving gas return ports 22 and 23 are provided above the communication port 24 and below the communication port 25, respectively, on the side surfaces, respectively.
When the sub-switching valve body 19 is located on the piston pump A side, the drive gas inlet 21 and the communication port 24, the drive gas return port 23 and the communication port 25 are communicated with each other, and the drive gas return port 22 is closed. , when the sub switching valve body 19 is located on the side away from the piston pump A, the driving gas inlet 21 and the communication port 25,
The driving gas return port 22 and the communication port 24 are communicated with each other, and the driving gas return port 23 is closed. In order to ensure this operation, the driving gas supplied from the driving gas inlet 21 is used. In order to prevent the sub-switching valve body 19 from moving due to the movement, the sub-switching valve body 19 has a through hole 26 that communicates between the intermediate portion and the opposite end surface on the piston pump A side. At least two through-holes 27 are formed in each of the through-holes 27 to communicate with the auxiliary switching valve body 19, and as a result, the drive gas passing through the through-holes 26 or 27 presses the sub-switching valve body 19 so as not to move. . The driving gas main switching valve 28 is a main switching valve in which a communication port 31 communicating with the communication port 24 of the driving gas sub-switching valve 16 and a communication port 32 communicating with the communication port 27 are provided facing each other. Consisting of a valve cylinder 29 and a main switching valve body 30 movably housed within the main switching valve cylinder 29, when driving gas is supplied from the communication port 31, the main switching valve body 30 moves to the communication port 32. When the main switching valve body 30 is moved to the communication port 31 side and driving gas is supplied from the communication port 32, the main switching valve body 30 is moved to the communication port 31 side. In addition, this driving gas main switching valve 2
The main switching valve cylinder 29 of No. 8 has a driving gas inlet 3.
3 and a driving gas return port 34, and the driving gas supplied from the driving gas inlet 33 is transferred to the driving gas inlets 6, 7 of the driving cylinder 1.
Driving gas supply ports 35 and 36 that supply gas to the
The driving gas discharged from the driving gas outlets 8 and 9 of the driving cylinder 1 is transferred to the driving gas return port 34.
Drive gas return ports 37 and 38 are provided to communicate with the drive gas main switching valve 28 via the communication port 24 of the drive gas sub-switching valve 16.
When driving gas is supplied to , the sub-switching valve body 19 closes the driving gas supply port 35 and the driving gas return port 38 and opens the driving gas supply port 36 and the driving gas return port 37. , driving gas sub-switching valve 1
When driving gas is supplied to the communication port 32 of the main driving gas switching valve 28 through the communication port 25 of No. 6, the sub switching valve body 19 closes the driving gas supply port 36 and the driving gas return port 37. Along with the driving gas supply port 35
and the driving gas return port 38 are opened.

C is a control tank into which high-temperature, high-pressure condensate generated by steam-based thermal equipment flows, and this control tank C is equipped with a water level detection device 39 that detects the amount of condensate. When the amount of condensate in the tank C exceeds a certain level, a signal from the water level detection device 39 triggers a solenoid valve installed in a pipe that supplies driving gas to the driving gas sub-switching valve 16 and the driving gas main switching valve 28. 4
0 is activated and the driving gas is switched to the driving gas sub-switching valve 1.
6 and the driving gas main switching valve 28 to drive the piston pump A. The bottom of the control tank C and the condensate inlets 12 and 13 of the condensate cylinder 3 are connected by piping so that condensate can be constantly supplied to the condensate cylinder 3. An automatic gas vent valve 41 is installed near the piston pump A in the condensate discharge pipe connected to the condensate outlets 14 and 15 of the water cylinder 3. Gas is quickly discharged to enable normal operation without cavitation.

When the condensate recovery pump device according to the present invention having the above structure is applied to a steam system as shown in FIG. 3, it operates as shown below.

That is, the steam generated from the steam boiler 42 is used by the high pressure user 43 and the low pressure user 44 to become condensate, and this condensate is discharged by the condensate recovery pump device according to the present invention to the steam boiler. It will be recovered on the 42nd. For example, the high-pressure steam generated by the steam boiler 42 is first divided into those used by the high-pressure user 43 and those used for driving the device of the present invention, and after being used for driving the device of the present invention, The steam can be effectively used by the low-pressure user 44 as low-pressure steam. Note that if the steam system does not have two users, high pressure and low pressure,
A pressure reducing valve may be provided in the steam pipe to supply steam at a predetermined pressure to the user. Furthermore, if compressed air is used as the driving gas instead of steam as in the above-mentioned embodiment, the compressed air after driving the device of the present invention can be released into the atmosphere. From the viewpoint of energy saving, it is preferable to use air with a low inlet pressure.

The apparatus of the present invention used in this manner operates as follows.

The condensate generated by the steam boiler 42, used by the user, and returned to the control tank C is detected by the water level detection device 39, and the condensate amount in the control tank C is detected at the desired level. When the water level exceeds a fixed amount, the electromagnetic valve 40 is actuated by a signal from the water level detection device 39, and the driving gas is supplied to the switching device B consisting of the driving gas sub-switching valve 16 and the driving gas main switching valve 28. The driving gas that has passed through the gas main switching valve 28 is supplied to the driving cylinder 1, so that the driving piston 2 starts moving. When the driving piston 2 thus reaches the vicinity of the top dead center or the bottom dead center, the auxiliary switching valve body 19 of the driving gas auxiliary switching valve 16 is moved by the rod 17 interlocking with the driving piston 2, and switching is performed. carried out, the auxiliary switching valve cylinder 20
Since the supply path of the driving gas that communicates with the main switching valve cylinder 29 is switched, the main switching valve body 30 instantly moves within the main switching valve cylinder 29 and is driven via the driving gas main switching valve 28. The flow path for supplying driving gas to the cylinder 1 is switched, and the direction of movement of the driving piston 2 is reversed. In this way, when the driving piston 2 moves while changing its direction of movement alternately, the condensing piston 4, which is connected to the driving piston 2 by the piston rod 5, also moves at the same time.
This movement of the condensate piston 4 causes the condensate in the control tank C to be discharged toward the steam boiler 42.

The condensate recovery pump device according to the present invention as detailed above has various advantages listed below, and its practical value is very great.

(1) Electrical energy is not used as the motive power required for condensate recovery and pressurization, and only a small amount of driving steam energy or compressed air is used, resulting in a large energy-saving effect, and no electrical power wiring is required. It is advantageous in terms of security and equipment.

(2) The operating speed follows the amount of condensate generated, and only a small amount of piston sliding resistance is required as the driving force in addition to the net water power, so the amount of power can be significantly reduced compared to electric pump systems. . Furthermore, when there is a pressure difference between high and low pressures in the steam system,
If high-pressure steam in the steam system is used as the driving gas, the steam after driving the device of the present invention can be supplied to a low-pressure user, so the exhaust gas can be diverted to the atmosphere, as is the case with conventional float-type condensate boosters. Since there is no need to open it, waste of energy can be eliminated.

(3) When the amount of condensate generated decreases, the amount of gas supplied to the drive piston in the drive cylinder of the piston pump is controlled ON/OFF, which slows down the movement of the drive piston. When the amount of condensate in the tank is less than a predetermined amount, driving gas is no longer supplied to the driving cylinder and the driving piston is no longer driven, resulting in a high energy-saving effect, and even if live steam flows into the condensing cylinder. Since the system operates without problems such as re-evaporation, it can be installed even in systems where steam leaks due to trap malfunction occur.

(4) Due to the throttling effect at the outlet of the driving gas of the driving piston, the reciprocating motion of the piston is decelerated near its top dead center and bottom dead center, allowing smooth operation.

(5) Since a completely mechanical mechanism is used to switch the supply path of the drive gas supplied to the drive cylinder, the lifespan and price are shorter than when using an electrically operated valve for high temperature and high pressure. - Advantageous in terms of operational stability.

[Brief explanation of drawings]

Figure 1 shows one of the condensate recovery pump devices according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the drive gas sub-switching valve in FIG. 1, and FIG. 3 is an embodiment of a steam system equipped with a condensate recovery pump device according to the present invention. It is a diagram. A...Piston pump, 1...Driving cylinder, 2...Driving piston, 3...Condensing cylinder, 4...Condensing piston, 5...Piston rod, 6, 7...Driving gas inlet, 8, 9... Outlet of driving gas, 10... Irregular packing, 11
... Packing adjuster, 12, 13 ... Condensate inlet, 14, 15 ... Condensate outlet, B ... Switching device, 16 ... Drive gas sub-switching valve, 17 ... Rod, 18 ... Irregular packing, 19...Sub-switching valve body, 20...Sub-switching valve cylinder, 21...Driving gas inlet, 22, 23...Driving gas return port, 2
4, 25... Connection port, 26, 27... Through hole, 2
8... Drive gas main switching valve, 29... Main switching valve cylinder, 30... Main switching valve body, 31, 32... Communication port, 33... Drive gas inlet, 34... Drive gas return port , 35, 36...driving gas supply port,
37, 38... Drive gas return port, C... Control tank, 39... Water level detection device, 40...
Solenoid valve, 41... automatic gas vent valve, 42... steam boiler, 43... high pressure user, 44... low pressure user.

Claims (1)

[Claims for Utility Model Registration] 1. A driving cylinder 1 in which a driving piston 2 driven by a driving gas consisting of steam or compressed air is reciprocated, and a driving piston forming a compartment with the driving cylinder 1. A piston pump A consisting of a condensate cylinder 3 connected to a condensate cylinder 2 by a piston rod 5, and in which a condensate piston 4 that sucks and pumps condensate moves reciprocally.
When the driving piston 2 moves to near the vertical dead center, the driving piston 2 or the condensing piston 4
A driving gas main switching switch that changes the flow path of the driving gas supplied to the driving cylinder 1 by switching the driving gas supplied through the driving gas sub-switching valve 16, which is switched by a rod 17 fixed to the cylinder 1. A condensate recovery pump device comprising a switching device B comprising a valve 28 and a control tank C for supplying condensate to a condensate cylinder 3 of a piston pump A. 2. A utility model in which the part of the partition wall between the driving cylinder 1 and the condensing cylinder 3 of the piston pump A, through which the piston rod 5 passes, is sealed by an irregularly shaped packing 10 that is replenished by tightening the packing adjuster 11. Scope of registration claims No. 1
The condensate recovery pump device described in Section. 3. The sub-switching valve body 19 of the drive gas sub-switching valve 16 of the switching device B has at least two or more valves that communicate with the end face on the opposite side of the piston pump A side and between the intermediate part and the end face on the side of the piston pump A. The condensate recovery pump device according to claim 1 or 2, in which through holes 26 and 27 are formed. 4 When control tank C detects that the amount of condensate inside it has exceeded a certain level, switching device B
A utility model registered in any one of claims 1 to 3, which is equipped with a water level detection device 39 that emits a signal to operate a solenoid valve 40 provided in a conduit that supplies driving gas to the The condensate recovery pump device described.