JP6913497B2 - Vacuum heating pump device - Google Patents

Description

The present invention relates to a vacuum heating pump device used in a vacuum heating system for heating the inside of a building.

Conventionally, a vacuum heating system including a vacuum heating pump device, a boiler, and a radiator has been used mainly for heating the inside of a building in a cold region. The vacuum heating system heats the inside of the building by sending the steam generated from the boiler to the radiator and releasing the heat of the steam from the radiator. A part of the steam that releases heat becomes condensed water and is sent to the vacuum heating pump device. In the vacuum heating pump device, the mixed fluid of air and condensed water is separated into air and water, and the water is returned to the boiler by the vacuum heating pump device. In such a vacuum heating system, leakage of air from a pipe that serves as a flow path for steam or water causes the vacuum to not be maintained, the return of condensed water to be poor, and the life of the vacuum heating pump device to be shortened. Become. Therefore, especially in the piping from the radiator to the vacuum heating pump device, the piping is connected with particular care so as not to leak air or water from the outside, and airtightness is ensured.

FIG. 5 is a schematic view showing an example of a conventional vacuum heating system. As shown in FIG. 5, the vacuum heating system includes a vacuum heating pump device 101, a water supply tank 140, a boiler 150, a radiator 160, a steam trap 170, and a water return pipe 180. The vacuum heating pump device 101 has a receiver tank 104, and the receiver tank 104 is provided with a vacuum pump 102 and a water supply pump 103. The water supply pump 103 communicates with the water supply tank 140, and the water supply tank 140 communicates with the boiler 150. The boiler 150 communicates with the radiator 160, and the radiator 160 communicates with the steam trap 170. The steam trap 170 communicates with the receiver tank 104 of the vacuum heating pump device 101 through the water return pipe 180.

Water is supplied from the water supply tank 140 into the boiler 150. The water in the boiler 150 is heated and a part of it evaporates to become steam. The steam is sent to the radiator 160. In the radiator 160, heat exchange is performed between the steam flowing in the radiator 160 and the outside air, thereby warming the inside of the building. Due to heat exchange, part of the steam becomes condensed water. The condensed water that has exited the radiator 160 passes through the steam trap 170 and flows into the return water pipe 180.

When the vacuum pump 102 operates, a vacuum is formed in the receiver tank 104, and the air and the condensed water in the water return pipe 180 are sucked into the receiver tank 104. The condensed water that has flowed into the receiver tank 104 is stored in the receiver tank 104, and the water in the receiver tank 104 is transferred to the water supply tank 140 by the water supply pump 103, and further transferred from the water supply tank 140 to the boiler 150.

Jikken Sho 60-9532 Gazette

In the vacuum heating system, the vacuum heating pump device 101 may be installed in a building other than the building to be heated. Then, the return water pipe 180 is arranged outdoors and is placed in an environment exposed to the outside air. When the outside air temperature at the place where the return water pipe 180 is installed is low and the return water pipe 180 is pulled sideways for a long distance, the fluid in the return water pipe 180 may be cooled. When the fluid is cooled, it is accompanied by a decrease in volume. In particular, when a very small amount of water vapor that could not be separated by the steam trap 170 is cooled and the steam changes to water in the return water pipe 180, the return water pipe 180 leaks air or water from the outside of the pipe as described above. Since the airtightness is high so that there is no leakage and the length of the pipe is long, the pressure in the water return pipe 180 and the receiver tank 104 is reduced. As a result, the pressure in the receiver tank 104, which is the pressure on the suction side of the water supply pump 103, becomes lower than the operable pressure range of the water supply pump 103, which may cause cavitation of the water supply pump 103. Further, when the pressure in the return water pipe 180 and the receiver tank 104 is lowered, the boiling point of the water in the receiver tank 104 is lowered to boil, and bubbles are generated in the water. If such air bubbles are sucked into the water supply pump 103, the water supply pump 103 may cause an airlock and the water may not be able to be sent to the water supply tank 140.

The present invention has been made to solve the above-mentioned conventional problems, and provides a vacuum heating pump device capable of stable operation without being affected by the outside air temperature and the length of the water return pipe. With the goal.

One aspect of the present invention is a vacuum heating pump device used in a vacuum heating system for heating the inside of a building, in which a receiver tank that receives water generated by condensation of steam and a vacuum pump that forms a vacuum in the receiver tank. A water supply pump that discharges water from the receiver tank, a vacuum breaker that introduces air into the receiver tank, and a vacuum switch that detects the pressure in the receiver tank are provided, and the vacuum breaker is the vacuum opening / closing. It is a vacuum heating pump device characterized by having an automatic valve that operates based on a signal from a device.

One aspect of the present invention is a vacuum heating pump device used in a vacuum heating system for heating the inside of a building, in which a receiver tank that receives water generated by condensation of steam and a vacuum pump that forms a vacuum in the receiver tank. A water supply pump that discharges water from the receiver tank and a vacuum breaker that introduces air into the receiver tank are provided. The vacuum heating pump device is further provided with a return water inlet portion for flowing into the inside, and the vacuum breaker is vertically installed above the return water inlet portion.
A preferred embodiment of the present invention is characterized in that the vacuum breaker is configured to introduce the atmosphere when the pressure in the receiver tank is lower than the set value.
A preferred embodiment of the present invention is characterized in that the set value of the vacuum breaker is equal to or less than the lower limit value of the pressure in the receiver tank.
A preferred embodiment of the present invention is characterized in that the vacuum breaker is connected to the receiver tank.
A preferred embodiment of the present invention is characterized in that the vacuum breaker includes a pressure sensor that measures the pressure inside the receiver tank and an automatic valve that operates based on a signal from the pressure sensor.
A preferred embodiment of the present invention is characterized in that the vacuum breaker further includes an alarm device that issues an alarm based on a signal from the pressure sensor .
In a preferred embodiment of the present invention, the vacuum breaker includes a pressure sensor that measures the pressure inside the receiver tank, an alarm that issues an alarm based on a signal from the pressure sensor, and a manual on-off valve. it shall be the features a.

Since the vacuum breaker can prevent an excessive drop in the pressure in the receiver tank, it is possible to prevent boiling of water in the receiver tank. Therefore, according to the present invention, it is possible to provide a vacuum heating pump device capable of stable operation without being affected by the outside air temperature and the length of the water return pipe.

It is a schematic diagram which shows the vacuum heating system which incorporated the vacuum heating pump device which concerns on one Embodiment of this invention. It is sectional drawing of the vacuum heating pump device of FIG. It is a schematic diagram which shows one Embodiment of a vacuum breaker. It is a schematic diagram which shows the other embodiment of the vacuum breaker. It is a schematic diagram which shows an example of the conventional vacuum heating system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a vacuum heating system incorporating a vacuum heating pump device according to an embodiment of the present invention. As shown in FIG. 1, the vacuum heating system includes a vacuum heating pump device 1, a water supply tank 40, a boiler 50, a radiator 60, a steam trap 70, and a water return pipe 80.

The vacuum heating pump device 1 includes a receiver tank 4 for receiving condensed water generated by condensing steam. The receiver tank 4 is configured to be able to hold water Ws inside. A vacuum pump 2 is provided on the upper part of the side surface of the receiver tank 4, and a water supply pump 3 is provided on the lower part of the side surface of the receiver tank 4. A water level switch 5, an exhaust check valve 7, a vacuum switch 8, a water return inlet portion 9, and a strainer 13 are provided on the upper surface of the receiver tank 4. The water level switch 5 has a float 6 that moves up and down according to the water level in the receiver tank 4, and is configured to detect a high water level and a low water level in the receiver tank 4 based on the position of the float 6. The return water inlet portion 9 is provided with a vacuum breaker 20 communicating with the inside of the receiver tank 4. The vacuum breaker 20 is arranged at a position higher than the water level (surface position of water Ws) in the receiver tank 4.

The water supply pump 3 is a pump device (FIG. 2) having a pump 3a, a motor 3b as a driving machine, and a rotating shaft 3c. Further, a suction port 10 and a discharge port 10 are provided in the casing of the pump 3a. It has an outlet 11. The impeller 3d in the casing of the pump 3a is rotated by the drive of the motor 3b to pressurize the water flowing in from the suction port 10 and discharge it to the discharge port 11.

The suction port 10 of the water supply pump 3 communicates with the inside of the receiver tank 4, and the discharge port 11 of the water supply pump 3 communicates with the water supply tank 40 through the check valve 12. The water supply tank 40 communicates with the boiler 50. The water supply tank 40 includes a pump (not shown), and the water in the water supply tank 40 is sent to the boiler 50 by the operation of this pump. The water supply tank 40 may be omitted. In this case, the water in the receiver tank 4 is sent directly to the boiler 50 by the water supply pump 3.

The boiler 50 communicates with the radiator 60 through the steam pipe 51, and the radiator 60 communicates with the steam trap 70. The steam trap 70 is arranged downstream of the radiator 60. One end of the return water pipe 80 is connected to the steam trap 70, and the other end of the return water pipe 80 is connected to the return water inlet portion 9 provided in the receiver tank 4. The steam trap 70 communicates with the return water inlet portion 9 through the return water pipe 80, and the return water inlet portion 9 communicates with the inside of the receiver tank 4. The return water inlet portion 9 includes a strainer 13, and the pipeline of the return water pipe 80 communicates with the inside of the receiver tank 4 through the return water inlet portion 9 and the strainer 13.

The water in the boiler 50 is heated and a part of it evaporates to become steam. The steam is sent to the radiator 60 through the steam pipe 51. In the radiator 60, heat exchange is performed between the steam flowing in the radiator 60 and the outside air, thereby warming the inside of the building. By heat exchange, part of the steam becomes condensed water. The steam trap 70 is a kind of automatic valve used for the purpose of discharging only condensed water from a steam atmosphere and not leaking steam as much as possible. Therefore, the condensed water passes through the steam trap 70 and flows into the return water pipe 80. The condensed water passing through the steam trap 70 contains a very small amount of steam leaked from the steam trap 70.

When the vacuum pump 2 operates, a vacuum is formed in the receiver tank 4. Since the return water pipe 80 communicates with the receiver tank 4 through the return water inlet portion 9 and the strainer 13, the air and condensed water in the return water pipe 80 are filtered by the strainer 13 and sucked into the receiver tank 4. The condensed water that has flowed into the receiver tank 4 is stored in the receiver tank 4 as water Ws. The temperature of the water in the receiver tank 4 is about 60 ° C. to 80 ° C. because it is the return water from the boiler 50 and the radiator 60, and the air containing water vapor exists in the upper part of the receiver tank 4. A phase space M is formed.

The pressure in the receiver tank 4 is detected by the vacuum switch 8. The vacuum switch 8 is connected to the vacuum pump 2 via a signal line. The vacuum switch 8 transmits an ON signal to the vacuum pump 2 when the pressure in the receiver tank 4 becomes higher than the pressure upper limit value, and sends an OFF signal to the vacuum pump 2 when the pressure in the receiver tank 4 becomes lower than the pressure lower limit value. Send to 2. The lower limit of pressure is lower than the upper limit of pressure, and the upper limit of pressure is lower than the atmospheric pressure (lower limit of pressure <upper limit of pressure <atmospheric pressure). The vacuum pump 2 starts when it receives an ON signal and stops when it receives an OFF signal. The lower limit of pressure is set based on the pressure range in which the water supply pump 3 can be operated without causing cavitation. Further, the temperature of the return water returned to the receiver tank 4 is limited based on the evaporation temperature of the water and the degree of vacuum so that the water does not evaporate even at the lower limit of the pressure.

When the water level in the receiver tank 4 rises above the upper limit of the water level described later and the water supply pump 3 operates, the water Ws in the receiver tank 4 is discharged from the receiver tank 4 by the water supply pump 3. Water Ws is sent to the water supply tank 40 through the check valve 12, and further sent from the water supply tank 40 to the boiler 50 by a pump (not shown). The water in the boiler 50 is heated by a heat source (not shown) to produce steam.

The water level in the receiver tank 4 is detected by the water level switch 5. The water level switch 5 is connected to the water supply pump 3 via a signal line. The water level switch 5 transmits an ON signal to the water supply pump 3 when the water level in the receiver tank 4 becomes higher than the water level upper limit value, and sends an OFF signal to the water supply pump 3 when the water level in the receiver tank 4 becomes lower than the water level lower limit value. Send to 3. The lower limit of the water level is lower than the upper limit of the water level (lower limit of the water level <upper limit of the water level). The water supply pump 3 starts when it receives an ON signal and stops when it receives an OFF signal.

FIG. 2 is a cross-sectional view of the vacuum heating pump device 1 of FIG. The vacuum heating pump device 1 includes the receiver tank 4, the vacuum pump 2, the water supply pump 3, the water level switch 5, the exhaust check valve 7, the vacuum switch 8, the return water inlet 9, the strainer 13, and the vacuum breaker 20. It has. The vacuum heating pump device 1 may further include a water return pipe 80 and a valve (not shown) that shuts off the flow path of the water return pipe 80.

In the present embodiment, the vacuum pump 2 is a water-sealed vacuum pump. As shown in FIG. 2, the vacuum pump 2 includes an intake port 23, a discharge port 22, a make-up water orifice 24, and a water sealing portion 28. A steam separation chamber 21 is provided in the upper part of the receiver tank 4, and the discharge port 22 of the vacuum pump 2 communicates with the steam separation chamber 21. The intake port 23 of the vacuum pump 2 is open to the gas phase space M in the receiver tank 4. The air containing water vapor existing in the gas phase space M is sucked into the vacuum pump 2 through the intake port 23 and discharged from the discharge port 22 toward the air / water separation chamber 21.

The make-up water orifice 24 communicates with the air-water separation chamber 21. As the vacuum pump 2 operates, the water Wp in the air-water separation chamber 21 is sucked into the water sealing portion 28 of the vacuum pump 2 through the make-up water orifice 24. One end of the make-up water pipe 25 is connected to the discharge port 11 of the water supply pump 3, and the other end of the make-up water pipe 25 is connected to the intake port 23 of the vacuum pump 2. A part of the water flowing in the water supply pump 3 is transferred to the intake port 23 through the make-up water pipe 25, and is further supplied to the water sealing portion 28. If water is supplied to the water sealing portion 28 of the vacuum pump 2 during operation of the vacuum pump 2, the make-up water pipe 25 may not be provided.

The steam-containing air existing in the gas phase space M is sucked into the water seal portion 28 together with the water supplied from the water supply pump 3 and the air-water separation chamber 21, compressed in the water seal portion 28, and together with the water. It is discharged from the discharge port 22 to the air-water separation chamber 21. Air is separated from water in the brackish water separation chamber 21. The air is discharged to the outside of the steam separation chamber 21 through the exhaust check valve 7. On the other hand, the water separated from the air is stored in the brackish water separation chamber 21 (see reference numeral Wp). During the operation of the vacuum pump 2, the pressure inside the air-water separation chamber 21 is set to atmospheric pressure.

The vacuum breaker 20 is a device that introduces the atmosphere into the receiver tank 4 in which the vacuum is formed, and is configured to introduce the atmosphere into the receiver tank 4 when the pressure in the receiver tank 4 is lower than the set value. ing. The vacuum breaker 20 is provided to prevent an excessive drop in pressure in the receiver tank 4. The vacuum breaker 20 communicates with the gas phase space M in the receiver tank 4. In the present embodiment, the vacuum breaker 20 is connected to the return water inlet portion 9, but as long as the vacuum breaker 20 communicates with the gas phase space M in the receiver tank 4, the installation position of the vacuum breaker 20 is particularly limited. Not done. For example, the vacuum breaker 20 may be connected to the upper surface of the receiver tank 4 or may be connected to the upper part of the side surface of the receiver tank 4. Further, the vacuum breaker 20 may be connected to the water return pipe 80.

FIG. 3 is a schematic view showing an embodiment of the vacuum breaker 20. The vacuum breaker 20 shown in FIG. 3 automatically opens when the pressure in the receiver tank 4 is lower than the first valve opening pressure set value which is equal to or lower than the pressure lower limit value which is the stop pressure of the vacuum pump 2, and is inside the receiver tank 4. This is an actuator-driven vacuum break valve that automatically closes when the pressure of is higher than the first valve closing pressure set value equal to or higher than the pressure upper limit value which is the starting pressure of the vacuum pump 2. The vacuum breaker 20 includes a ventilation pipe 31, a pressure sensor 32, and an automatic valve 33. The automatic valve 33 is a type of valve in which the valve body is driven by an electric actuator. Examples of the automatic valve 33 include a solenoid valve and an electric valve.

Here, as described above, in order to prevent the pressure in the receiver tank 4 from falling below the minimum pressure due to the decrease in the volume of the fluid in the highly airtight water return pipe 80 due to cooling, a vacuum is used. The breaker 20 may be provided at a position where the vacuum of the return pipe 80 is broken. In other words, if the static pressure of the return water pipe 80 drops excessively, the atmosphere may be introduced by the vacuum breaker 20. Here, for example, if the vacuum breaker 20 is installed on the side surface of the receiver tank 4 on the vacuum pump 2 side or near the intake port 23, the dynamic pressure at the time of suction of the vacuum pump 2 is erroneously detected as an excessive pressure drop in the receiver tank 4. There is a risk of doing so. The uppermost portion of the return water inlet portion 9 is located above the intake port 23 of the vacuum pump 2, and is not easily affected by the flow velocity due to the suction of the vacuum pump 2. Further, in order not to erroneously detect the dynamic pressure, the vacuum breaker 20 may be installed perpendicular to the flow path of the fluid to be measured (air in the gas phase space M). Therefore, the vacuum breaker 20 may be installed vertically above the return water inlet portion 9. More specifically, the vacuum breaker 20 may be installed so that the ventilation pipe 31 branches substantially perpendicular to the uppermost portion of the return water inlet portion 9. Alternatively, the vacuum breaker 20 may be installed vertically on the upper wall of the receiver tank 4 or the uppermost part in the water return pipe 80, which is not easily affected by the flow velocity due to the suction of the vacuum pump 2.

The ventilation pipe 31 communicates with the gas phase space M in the receiver tank 4. In the present embodiment, the ventilation pipe 31 is connected to the return water inlet portion 9. In one embodiment, the vent pipe 31 may be connected to the receiver tank 4 or the water return pipe 80. The pressure sensor 32 and the automatic valve 33 are attached to the ventilation pipe 31, and the pressure sensor 32 and the automatic valve 33 communicate with the gas phase space M through the ventilation pipe 31. The automatic valve 33 is electrically connected to the pressure sensor 32 and operates based on a signal from the pressure sensor 32. Specifically, the pressure sensor 32 measures the pressure in the receiver tank 4, and when the measured value of the pressure is equal to or less than the first valve opening pressure set value, sends an opening signal to the automatic valve 33 to measure the pressure. If it is determined that the value is larger than the first valve closing pressure set value, a closing signal is transmitted to the automatic valve 33. The automatic valve 33 is configured to open when it receives an open signal and close when it receives a close signal.

Here, the first valve opening pressure set value and the first valve closing pressure set value are arbitrary set values, and the first valve opening pressure set value is equal to or less than the above-mentioned pressure lower limit value. Further, the first valve closing pressure set value may be equal to or higher than the above-mentioned pressure upper limit value. That is, it is preferable that the first valve opening pressure set value ≤ pressure lower limit value <pressure upper limit value ≤ first valve closing pressure set value <atmospheric pressure.

Further, the timing of transmitting the closing signal to the automatic valve 33 may be after the automatic valve 33 has been opened for a predetermined time without using the first valve opening pressure set value. Further, when transmitting an open signal or a close signal to the automatic valve 33, a differential may be provided to prevent inching of the opening / closing operation of the automatic valve 33.

When the automatic valve 33 opens, the atmosphere is introduced into the receiver tank 4 through the vacuum breaker 20. As a result, the pressure in the receiver tank 4 rises to exceed the pressure upper limit value, and the vacuum pump 2 operates. In this way, the pressure in the receiver tank 4 can be maintained at an appropriate pressure between the upper limit value of the pressure and the lower limit value of the pressure, so that the boiling point of the water Ws in the receiver tank 4 is lowered and the temperature is low. It can be prevented from boiling. Further, since the pressure in the receiver tank 4 does not become lower than the lower limit of the pressure, it is possible to prevent the occurrence of cavitation on the suction side of the water supply pump 3. According to this embodiment, the vacuum heating pump device 1 can be operated stably without being affected by the outside air temperature and the airtightness and length of the return water pipe 80.

FIG. 4 is a schematic view showing another embodiment of the vacuum breaker 20. The vacuum breaker 20 shown in FIG. 4 is a manual vacuum breaker valve. The vacuum breaker 20 includes a ventilation pipe 31, a pressure sensor 32, an alarm 35, and a manual on-off valve 36. The ventilation pipe 31 communicates with the gas phase space M in the receiver tank 4. In the present embodiment, the ventilation pipe 31 is connected to the return water inlet portion 9. In one embodiment, the vent pipe 31 may be connected to the receiver tank 4 or the water return pipe 80. The pressure sensor 32 and the manual on-off valve 36 are attached to the ventilation pipe 31, and the pressure sensor 32 and the manual on-off valve 36 communicate with the gas phase space M through the ventilation pipe 31.

The alarm device 35 is electrically connected to the pressure sensor 32 and is configured to issue an alarm based on a signal from the pressure sensor 32. More specifically, the pressure sensor 32 measures the pressure in the receiver tank 4, and sends an open signal to the alarm 35 when the measured value of the pressure is equal to or less than the second valve opening pressure set value which is equal to or less than the lower limit of the pressure. When it is determined that the measured pressure value is larger than the second valve closing pressure set value, a closing signal is transmitted to the alarm device 35. Upon receiving the open signal, the alarm 35 issues an alarm urging the manual on-off valve 36 to be opened. Further, the alarm device 35 is configured to issue an alarm urging the manual on-off valve 36 to be closed when the closing signal is received.

Here, the second valve opening pressure set value and the second valve closing pressure set value are arbitrary set values, and the second valve opening pressure set value is equal to or less than the above-mentioned pressure lower limit value. Further, the second valve closing pressure set value may be equal to or higher than the above-mentioned pressure upper limit value. That is, it is preferable that the second valve opening pressure set value ≤ pressure lower limit value <pressure upper limit value ≤ second valve closing pressure set value <atmospheric pressure.

Further, the timing of transmitting the closing signal to the alarm device 35 may be after the opening signal to the alarm device 35 is continued for a predetermined time.

The operator can introduce the atmosphere into the receiver tank 4 through the vacuum breaker 20 by opening the manual on-off valve 36 based on the alarm issued from the alarm device 35. As a result, the pressure in the receiver tank 4 rises.

The pressure sensor 32 described above may be used in combination with the vacuum switch 8 that transmits an OFF signal to the vacuum pump 2 when the pressure in the receiver tank 4 becomes lower than the lower limit value of the pressure. As an example, when the pressure in the receiver tank 4 continues to be lower than the lower limit of the pressure for a predetermined time or longer, the vacuum switch 8 issues an open signal to the automatic valve 33 or the alarm 35, and then a close signal is emitted. good.

Further, the opening signal to the automatic valve 33 or the alarm device 35 may be determined based on the water level in the receiver tank 4. When the state lower than the upper limit of the water level exceeds a predetermined time, an open signal to the automatic valve 33 or the alarm 35 may be issued, and then a close signal may be issued. If the pressure in the receiver tank 4 continues to be lower than the lower limit of the pressure, water is not supplied to the receiver tank 4 and the water level does not rise. Therefore, it is preferable to monitor the water level and / or pressure in the receiver tank 4 and output an open signal to the automatic valve 33 or the alarm device 35.

Further, the alarm 35 of FIG. 4 may be added to the pressure sensor 32 of the vacuum breaker 20 of FIG. In that case, the first valve opening pressure set value and the second valve opening pressure set value may be the same, or the first valve opening pressure set value may be lower than the second valve opening pressure set value. When the first valve opening pressure set value is lower than the second valve opening pressure set value, an alarm is output by the alarm 35 when the pressure in the receiver tank 4 becomes equal to or less than the second valve opening pressure set value. Then, when the pressure drops to the first valve opening pressure set value, the automatic valve 33 should be opened.

In one embodiment, the vacuum breaker 20 automatically opens when the pressure in the receiver tank 4 is equal to or less than the lower limit of the pressure value and is equal to or less than the third valve opening pressure set value, and is higher than the third valve closing pressure set value. It may be a mechanical vacuum break valve that automatically closes. The mechanical vacuum break valve is a valve that does not have an electric actuator such as an electromagnet or a motor and automatically opens and closes according to a mechanical configuration. Such mechanical vacuum break valves are available on the market. Further, a vacuum relief valve or a vacuum adjusting valve may be used as the mechanical vacuum breaking valve.

The third valve opening pressure set value and the third valve closing pressure set value are arbitrary pressure set values, and the third valve opening pressure set value is equal to or less than the above-mentioned lower limit pressure value. Further, the third valve closing pressure set value may be equal to or higher than the above-mentioned pressure upper limit value. That is, it is preferable that the third valve opening pressure set value ≤ pressure lower limit value <pressure upper limit value ≤ third valve closing pressure set value <atmospheric pressure.

Here, an example of the mechanism of a commercially available mechanical vacuum break valve will be described. The mechanical vacuum break valve includes a valve body capable of shutting off the atmosphere in the receiver tank 4, an adjusting spring for adjusting the opening and closing of the valve body, and an adjusting screw for adjusting the force of the adjusting spring. When the negative pressure in the receiver tank 4 increases and approaches a predetermined degree of vacuum, the pressure in the gas phase space M trying to open the valve body and the force of the adjusting spring trying to close the valve body are balanced. The valve body opens when front leakage occurs and the negative pressure increases further. The opening degree of the valve body changes according to the negative pressure in the gas phase space M, and the amount of air introduced can be controlled to maintain the gas phase space M at a predetermined degree of vacuum.

Further, the mechanical vacuum break valve can adjust the predetermined degree of vacuum in the receiver tank 4 by adjusting the force of the adjusting spring with the adjusting screw. In the present embodiment, the pressure in the receiver tank 4 becomes equal to or higher than the lower limit of pressure by adjusting the predetermined degree of vacuum to a third valve opening pressure set value which is a pressure equal to or lower than the lower limit of pressure (high degree of vacuum). Be kept.

The above-described embodiment is described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is construed in the broadest range according to the technical idea defined by the claims.

1 Vacuum heating pump device 2 Vacuum pump 3 Water supply pump 4 Receiver tank 5 Water level switch 6 Float 7 Exhaust check valve 8 Vacuum switch 9 Return water inlet 10 Suction port 11 Discharge port 12 Check valve 13 Strainer 20 Vacuum breaker 21 Air-water separation chamber 22 Discharge port 23 Intake port 24 Replenishment water orifice 25 Replenishment water pipe 28 Water seal 31 Ventilation pipe 32 Pressure sensor 33 Automatic valve 35 Alarm 36 Manual on-off valve 40 Water supply tank 50 Boiler 51 Steam pipe 60 Dissipator 70 Steam trap 80 Return pipe 101 Vacuum heating pump device 102 Vacuum pump 103 Water supply pump 104 Receiver tank 140 Water supply tank 150 Boiler 160 Dissipator 170 Steam trap 180 Return pipe M Gas phase space Wp, Ws Water

Claims (8)

In a vacuum heating pump device used in a vacuum heating system that heats the inside of a building
A receiver tank that receives the water produced by the condensation of steam,
A vacuum pump that creates a vacuum in the receiver tank,
A water supply pump that discharges water from the receiver tank,
A vacuum breaker that introduces air into the receiver tank,
A vacuum switch for detecting the pressure in the receiver tank is provided.
The vacuum breaker is a vacuum heating pump device including an automatic valve that operates based on a signal from the vacuum switch. In a vacuum heating pump device used in a vacuum heating system that heats the inside of a building
A receiver tank that receives the water produced by the condensation of steam,
A vacuum pump that creates a vacuum in the receiver tank,
A water supply pump that discharges water from the receiver tank,
A vacuum breaker that introduces air into the receiver tank is provided.
The vacuum heating pump device further includes a return water inlet portion for allowing water generated by the condensation of the steam to flow into the inside of the receiver tank, and the vacuum breaker is perpendicular to the upper portion of the return water inlet portion. A vacuum heating pump device characterized by being installed in. The vacuum heating pump device according to claim 1 or 2, wherein the vacuum breaker is configured to introduce air when the pressure in the receiver tank is lower than a set value. The vacuum heating pump device according to claim 3, wherein the set value of the vacuum breaker is equal to or less than a lower limit value of the pressure in the receiver tank. The vacuum heating pump device according to any one of claims 1 to 4, wherein the vacuum breaker is connected to the receiver tank. The vacuum breaker
A pressure sensor that measures the pressure inside the receiver tank, and
The vacuum heating pump device according to any one of claims 1 to 5, further comprising an automatic valve that operates based on a signal from the pressure sensor. The vacuum breaker
The vacuum heating pump device according to claim 6, further comprising an alarm device that issues an alarm based on a signal from the pressure sensor. The vacuum breaker
A pressure sensor that measures the pressure inside the receiver tank, and
An alarm that issues an alarm based on the signal from the pressure sensor,
The vacuum heating pump device according to claim 1 or 2, further comprising a manual on-off valve.

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