Pump System

Abstract

To provide a pump system equipped with a temperature control unit for lubricating oil that complies with explosion-proof specifications. [Solution] The pump system 1, 1Z according to the present invention comprises a pump unit PU, a power unit 21, a transmission mechanism TM that transmits power generated by the power unit to the pump unit, and a temperature adjustment unit 3, 3Z that adjusts the temperature of lubricating oil Lb used to lubricate the transmission mechanism. The pump unit includes a plunger 25 and a pump chamber 201. The temperature adjustment unit includes a heat exchange tube L3 that is arranged to be in contact with the lubricating oil and exchanges heat with the lubricating oil using air CA, HA flowing therethrough, at least one air generator 31, 32 that generates heated or cooled air from compressed air A, which is the source of the air, and a connecting tube L2 connected to the air generator and the heat exchange tube and sending the air generated by the air generator to the heat exchange tube. The air generator generates air from compressed air using the vortex principle.

Description

[Technical Field]

[0001] The present invention relates to a pump system. [Background technology]

[0002] Reciprocating pumps, which use a plunger to directly pressurize and discharge pumped fluid, are used in a variety of situations (see, for example, Patent Documents 1 and 2). Due to their structure, reciprocating pumps require lubricating oil for their internal mechanisms. The temperature of the lubricating oil rises depending on the operating time of the reciprocating pump. Therefore, in situations where the pump is operated for a short period of time (intermittent operation), the reciprocating pump can be used alone. However, in situations where the pump is operated continuously for a long period of time (for example, 12 hours or more), the reciprocating pump requires a lubricating oil temperature adjustment unit (cooling unit). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-184184 [Patent Document 2] Japanese Patent Application Publication No. 2023-527344 Summary of the Invention [Problem to be solved by the invention]

[0004] Typically, the temperature adjustment unit is equipped with an oil reservoir tank for temporarily storing the lubricating oil, a heat exchanger for exchanging heat with the lubricating oil, and a circulation pump for circulating the lubricating oil between the reciprocating pump and the oil reservoir tank, and is located to the side of the reciprocating pump. Therefore, a pump system consisting of a reciprocating pump and a temperature adjustment unit requires a larger installation area (e.g., about 1.5 times) than the installation area of the reciprocating pump alone. Furthermore, if the heat exchanger is air-cooled, the temperature adjustment unit is equipped with a fan for air cooling. Furthermore, when the reciprocating pump is used in cold climates, the temperature adjustment unit is equipped with a heater for heating the lubricating oil.

[0005] Reciprocating pumps are also used to pump cryogenic liquefied gases (e.g., liquefied hydrogen, liquefied natural gas, liquefied oxygen, etc.). In particular, when reciprocating pumps are used to pump flammable liquefied gases (e.g., liquefied hydrogen or liquefied oxygen), the pump system is placed in an explosion-proof area that requires strict explosion-proof specifications (e.g., in the case of liquefied hydrogen, specifications that meet the electrical equipment explosion-proof standard "d3G4"). Therefore, a temperature control unit that meets the explosion-proof specifications is required. That is, an air-cooling fan motor and heater that meet the explosion-proof specifications are required. However, there are few heaters that meet the explosion-proof specifications, and they are not easy to obtain. Furthermore, the heater cannot be used alone; a heater control system that is compatible with the temperature control unit is required. In this case, the control system must be designed and certified (e.g., explosion-proof electrical equipment type certification), which requires cost and time.

[0006] An object of the present invention is to provide a pump system equipped with a temperature adjustment unit for lubricating oil that complies with explosion-proof specifications. [Means for solving the problem]

[0007] In one embodiment of the present invention, the pump system comprises a pump unit that sucks in, pressurizes, and discharges a pumped liquid; a power unit that generates power required to operate the pump unit; a transmission mechanism that transmits the power generated by the power unit to the pump unit; and a temperature control unit that adjusts the temperature of a lubricating oil used to lubricate the transmission mechanism, wherein the pump unit comprises a plunger that reciprocates using the power and a pump chamber that houses the plunger, and the temperature control unit comprises a heat exchange tube that is arranged so as to be in contact with the lubricating oil and exchanges heat with the lubricating oil using air flowing therethrough, at least one air generator that generates heated or cooled air from compressed air that is the source of the air, and a connecting tube that is connected to the air generator and the heat exchange tube and sends the air generated by the air generator to the heat exchange tube, and the air generator generates the air from the compressed air using the vortex principle. [Effects of the Invention]

[0008] The present invention can provide a pump system equipped with a temperature adjustment unit for lubricating oil that complies with explosion-proof specifications. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a pump system showing an embodiment of the pump system according to the present invention; [Figure 2] FIG. 2 is a schematic diagram of the pump system showing the lubricating oil being cooled. [Figure 3] FIG. 2 is a schematic diagram of the pump system showing the lubricating oil being heated. [Figure 4] FIG. 2 is a schematic diagram of the pump system showing a state in which a heat exchange plate of the pump system is heated. [Figure 5] FIG. 10 is a schematic diagram of a pump system showing a modified example of the pump system according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a pump system according to the present invention will be described below. In the following description, the drawings will be referred to as appropriate. In the drawings, the same members and elements are designated by the same reference numerals, and duplicated descriptions will be omitted. Furthermore, the dimensional proportions of the elements may be exaggerated for the sake of convenience, and are not limited to the proportions shown in the drawings.

[0011] ●Pump system● ●Pump system connection example FIG. 1 is a schematic diagram of a pump system according to an embodiment of the present invention.

[0012] The pump system 1 sucks in, pressurizes, and discharges the liquid W to be handled. The pump system 1 is used, for example, to supply fuel to a vehicle (e.g., a ship) that travels for long periods of time. The pump system 1 is disposed in an explosion-proof area of the vehicle that meets the required explosion-proof specifications (e.g., specifications that comply with "d3G4" of the explosion-proof standard for electrical machinery and equipment; the same applies below). The pump system 1 includes a reciprocating pump 2 and a temperature adjustment unit 3.

[0013] The "handled liquid W" is, for example, a cryogenic liquefied gas (for example, liquefied hydrogen).

[0014] The reciprocating pump 2 sucks, pressurizes, and discharges the pumped liquid W. The reciprocating pump 2 is, for example, a known reciprocating pump. The reciprocating pump 2 includes a housing 20, a motor 21, a rotating shaft 22, a connecting rod 23, a coupling member 24, and a plunger 25.

[0015] In the following description, the "forward / backward direction" refers to the reciprocating direction of the plunger 25. The "forward direction" is the direction in which the plunger 25 moves to pressurize the pumped fluid W (so that the reciprocating pump 2 discharges the pumped fluid W). The "rearward direction" is the direction in which the plunger 25 moves to suck in the pumped fluid W (so that the reciprocating pump 2 sucks in the pumped fluid W).

[0016] The housing 20 accommodates the motor 21, the rotating shaft 22, the connecting rod 23, the coupling member 24, and the plunger 25. The housing 20 is made of metal and includes a pump chamber 201, a suction pipe 202, a discharge pipe 203, a machine chamber 204, a coupling chamber 205, a plurality of heat exchange plates 206, and an internal oil reservoir 207.

[0017] The pump chamber 201 slidably accommodates the front portion of the plunger 25. In the pump chamber 201, the pumped fluid W is sucked in and discharged as the plunger 25 reciprocates. The front portion of the housing 20 forms the pump chamber 201. That is, the pump chamber 201 is disposed in the front portion of the housing 20.

[0018] The suction pipe 202 is a flow path through which the treated liquid W flows and is sucked into the pump chamber 201. The suction pipe 202 is connected to the front end of the pump chamber 201.

[0019] The discharge pipe 203 is a flow path through which the treated liquid W discharged from the pump chamber 201 flows. The discharge pipe 203 is connected to the lower end of the pump chamber 201.

[0020] The machine room 204 accommodates the motor 21, the rotating shaft 22, the connecting rod 23, and the coupling member 24. The rear half of the housing 20 forms the machine room 204. That is, the machine room 204 is disposed in the rear half of the housing 20.

[0021] The connecting chamber 205 connects the pump chamber 201 and the machine chamber 204. The portion of the housing 20 between the pump chamber 201 and the machine chamber 204 constitutes the connecting chamber 205. That is, the connecting chamber 205 is disposed between the pump chamber 201 and the machine chamber 204. In other words, the connecting chamber 205 is disposed between the pump unit PU, which will be described later, and the transmission mechanism TM, which will be described later. The connecting chamber 205 accommodates the rear part of the plunger 25 and the front part of the connecting member 24. The interior of the connecting chamber 205 is purged with an inert gas (e.g., nitrogen).

[0022] The heat exchange plate 206 exchanges heat with the outside air, thereby mitigating the transfer of heat between the pump unit PU (described later) and the machine chamber 204. The heat exchange plate 206 has, for example, a plate shape. The heat exchange plate 206 is disposed so as to protrude from the outer peripheral surface of the rear part of the pump chamber 201.

[0023] The internal oil reservoir 207 temporarily stores lubricating oil Lb used to lubricate the transmission mechanism TM, which will be described later. The lower part of the machine chamber 204 constitutes the internal oil reservoir 207. That is, the internal oil reservoir 207 is disposed in the lower part of the machine chamber 204.

[0024] The motor 21 generates power (rotational power) required for the operation (reciprocation) of the plunger 25. The motor 21 is, for example, a known motor 21. The motor 21 is an example of a power unit in the present invention.

[0025] The rotating shaft 22 is directly or indirectly connected to the motor 21 and rotates in response to the rotation of the motor 21. The rotating shaft 22 is made of metal. The rotating shaft 22 is disposed so that the axial direction of the rotating shaft 22 is perpendicular to the front-rear direction.

[0026] The connecting rod 23 transmits the power of the motor 21, which is transmitted via the rotating shaft 22, to the connecting member 24. The connecting rod 23 is made of metal. The connecting rod 23 is connected to the rotating shaft 22 and the rear part of the connecting member 24.

[0027] The connecting member 24 transmits the power transmitted from the connecting rod 23 to the plunger 25. The connecting member 24 is made of metal. The connecting member 24 reciprocates in the front-rear direction due to the power (reciprocating power) transmitted by the connecting rod 23. The front end of the connecting member 24 is connected to the rear end of the plunger 25.

[0028] The plunger 25 reciprocates back and forth based on the power transmitted from the connecting member 24, thereby increasing or decreasing the volume of the pump chamber 201. The plunger 25 is made of metal. As described above, the plunger 25 is connected to the connecting member 24. Therefore, when the connecting member 24 reciprocates as the rotating shaft 22 rotates due to the power of the motor 21, the plunger 25 reciprocates together with the connecting member 24 in conjunction with the reciprocating movement of the connecting member 24. When the plunger 25 retracts, the volume of the pump chamber 201 increases, and the pumped fluid W flowing through the suction pipe 202 is sucked into the pump chamber 201. On the other hand, when the plunger 25 advances, the volume of the pump chamber 201 decreases, and the pumped fluid W in the pump chamber 201 is pressurized and discharged to the discharge pipe 203. A check valve (not shown) is provided in the pump chamber 201, preventing the pumped fluid W from flowing back into the suction pipe 202.

[0029] In this way, the rotating shaft 22, the connecting rod 23, and the coupling member 24 constitute a transmission mechanism TM that converts the power (rotational power) of the motor 21 into the power (reciprocating power) of the plunger 25 and transmits the power. The pump chamber 201 and the plunger 25 constitute a pump unit PU that sucks in the treated fluid W, pressurizes it, and discharges it. In other words, the reciprocating pump 2 comprises the transmission mechanism TM and the pump unit PU. The transmission mechanism TM comprises the rotating shaft 22, the connecting rod 23, and the coupling member 24. The pump unit PU comprises the pump chamber 201 and the plunger 25.

[0030] The temperature adjustment unit 3 adjusts the temperature of the lubricating oil Lb. The temperature adjustment unit 3 is disposed to the side of the reciprocating pump 2. The temperature adjustment unit 3 includes an external oil reservoir 30, a first air generator 31, a second air generator 32, an inlet pipe L1, a connecting pipe L2, a heat exchange pipe L3, an exhaust pipe L4, an air supply pipe L5, a first liquid supply pipe L6, a second liquid supply pipe L7, a first switching unit 33, a second switching unit 34, a temperature sensor 35, a circulation pump 36, and a control device 37.

[0031] The external oil reservoir 30 temporarily stores the lubricating oil Lb extracted from the reciprocating pump 2. In the vertical direction, the external oil reservoir 30 is disposed below the reciprocating pump 2 (internal oil reservoir 207). The external oil reservoir 30 is an example of the oil reservoir of the present invention.

[0032] The first air generator 31 generates cooled air CA, which is used for heat exchange with the lubricating oil Lb, based on the compressed air A. The first air generator 31 is a known air cooler that generates cooled air CA from the compressed air A using the known vortex principle (which separates the swirling flow of the compressed air A into a high-temperature air flow and a low-temperature air flow). The first air generator 31 is an example of an air generator in the present invention. The cooled air CA is an example of cooled air in the present invention.

[0033] The second air generator 32 generates high-temperature air HA based on the compressed air A, which is used for heat exchange with the lubricating oil Lb and for heating the heat exchange plate 206. The second air generator 32 is a known air heater that generates high-temperature air HA from the compressed air A using the known vortex principle. The second air generator 32 is an example of an air generator in the present invention. The high-temperature air HA is an example of heated air in the present invention.

[0034] The introduction pipe L1 is a pipe that sends (introduces) compressed air A to the first air generator 31 and the second air generator 32. The introduction pipe L1 is made of, for example, metal. One end L1a of the introduction pipe L1 is connected to a supply source of compressed air A (not shown; the same applies below), or to a supply pipe (not shown; the same applies below) that supplies compressed air A from the supply source. The other ends L1b and L1c of the introduction pipe L1, which are branched into two at point P1, are connected to the first air generator 31 and the second air generator 32.

[0035] The connecting pipe L2 is a pipe that sends cooled air CA or high-temperature air HA to the heat exchange pipe L3 or the air supply pipe L5. The connecting pipe L2 is made of, for example, metal. The connecting pipe L2 is branched into two at point P2, with one end L2a, L2b connected to the first air generator 31 and the second air generator 32. The other end L2c of the connecting pipe L2 is connected to the heat exchange pipe L3. The connecting pipe L2 is covered with a heat insulating material (not shown; the same applies below).

[0036] The heat exchange tube L3 mediates heat exchange between the cooling air CA or high-temperature air HA flowing inside the heat exchange tube L3 and the lubricating oil Lb. The heat exchange tube L3 is made of, for example, metal. The heat exchange tube L3 is shaped like a coil, for example. One end L3a of the heat exchange tube L3 is connected to the connecting tube L2, and the other end L3b of the heat exchange tube L3 is connected to the exhaust tube L4. The heat exchange tube L3 is housed in the external oil reservoir 30 and is immersed in (contacted with) the lubricating oil Lb. That is, the heat exchange tube L3 is disposed inside the external oil reservoir 30. As a result, the cooling air CA or high-temperature air HA flowing inside the heat exchange tube L3 exchanges heat with the lubricating oil Lb that is in contact with the heat exchange tube L3.

[0037] The exhaust pipe L4 exhausts the cooled air CA or high-temperature air HA sent from the heat exchange pipe L3 to the space outside the cooling unit (i.e., inside the explosion-proof area). The exhaust pipe L4 is made of, for example, metal. One end L4a of the exhaust pipe L4 is connected to the heat exchange pipe L3, and the other end L4b of the exhaust pipe L4 is an open end that is open to the outside space.

[0038] The air supply pipe L5 is a pipe that supplies the high-temperature air HA so that the high-temperature air HA exchanges heat with the heat exchange plate 206. The air supply pipe L5 is made of, for example, metal. One end L5a of the air supply pipe L5 is connected to point P3 of the connecting pipe L2, which is located between point P2 and the second air generator 32. The other end L5b of the air supply pipe L5 is located so as to face the heat exchange plate 206, and is an open end that is open to the outside space. The other end L5b is an example of an open end as defined in the present invention. The air supply pipe L5 is covered with a heat insulating material.

[0039] The first switching unit 33 switches the flow of compressed air A in the inlet pipe L1 to a flow toward the first air generator 31 or a flow toward the second air generator 32. The first switching unit 33 includes two valves V1 and V2. The valves V1 and V2 are, for example, known solenoid valves that comply with required explosion-proof specifications. The valve V1 is connected to the inlet pipe L1 (the other end L1b) and is disposed between point P1 and the first air generator 31. The valve V2 is connected to the inlet pipe L1 (the other end L1c) and is disposed between point P1 and the second air generator 32. The first switching unit 33 is an example of a switching unit defined in the present invention.

[0040] The second switching unit 34 switches the flow of high-temperature air HA in the connecting pipe L2 to a flow toward the heat exchange pipe L3 and / or a flow toward the heat exchange plate 206. The second switching unit 34 includes three valves V3, V4, and V5. The valves V3 to V5 are, for example, known solenoid valves that comply with required explosion-proof specifications. The valve V3 is connected to the connecting pipe L2 and is disposed between points P2 and P3. The valve V4 is connected to the air supply pipe L5. The valve V5 is connected to the connecting pipe L2 and is disposed between the first air generator 31 and point P2. The second switching unit 34 is an example of a switching unit defined in the present invention.

[0041] The first liquid supply pipe L6 is a pipe that supplies the lubricating oil Lb stored in the internal oil reservoir 207 to the external oil reservoir 30. The first liquid supply pipe L6 is made of, for example, metal. The first liquid supply pipe L6 is connected to the internal oil reservoir 207 and the external oil reservoir 30.

[0042] The second liquid supply pipe L7 is a pipe that supplies the lubricating oil Lb stored in the external oil reservoir 30 to the transmission mechanism TM. The second liquid supply pipe L7 is made of, for example, metal. One end of the second liquid supply pipe L7 is disposed inside the external oil reservoir 30. The other end of the second liquid supply pipe L7 is connected to the housing 20 so as to be able to supply the lubricating oil to an oil passage (not shown; the same applies below) formed in the transmission mechanism TM.

[0043] In the present invention, the other end L7b of the second liquid supply pipe L7 may be connected to the internal oil reservoir 207. In this case, the lubricating oil Lb stored in the internal oil reservoir 207 is sent to the transmission mechanism TM within the housing 20 by an oil pump (not shown; the same applies below) or the like.

[0044] The temperature sensor 35 detects the temperature of the lubricating oil Lb stored in the external oil reservoir 30. The temperature sensor 35 is, for example, a known temperature sensor that complies with the required explosion-proof specifications. The temperature sensor 35 is attached to the external oil reservoir 30.

[0045] In the present invention, the temperature sensor 35 may be attached to the first liquid feed pipe L6 or the second liquid feed pipe L7. In this case, the temperature sensor 35 detects the temperature of the lubricating oil Lb flowing through the first liquid feed pipe L6 or the second liquid feed pipe L7.

[0046] The circulation pump 36 circulates the lubricating oil Lb between the internal oil reservoir tank 207 and the external oil reservoir tank 30 by sending the lubricating oil Lb from the external oil reservoir tank 30 to the internal oil reservoir tank 207. The circulation pump 36 is, for example, a known pump that complies with the required explosion-proof specifications. The circulation pump 36 is connected to the second liquid supply pipe L7. The circulation pump 36, the first liquid supply pipe L6, and the second liquid supply pipe L7 constitute a circulation unit CU that circulates the lubricating oil Lb between the internal oil reservoir tank 207 (housing 20) and the external oil reservoir tank 30. That is, the temperature adjustment unit 3 includes the circulation unit CU.

[0047] The control device 37 controls the operation of the entire temperature adjustment unit 3 (for example, the valves V1 to V5 and the circulation pump 36). The control device 37 is a known controller that complies with the required explosion-proof specifications.

[0048] In the present invention, the control device 37 may be placed outside the explosion-proof area.

[0049] ●Pump system operation Next, an example of the operation of the pump system 1 will be described below. In the following description, FIG. 1 will be referred to as appropriate.

[0050] When the reciprocating pump 2 is stopped, the circulation pump 36 is stopped and the valves V1 to V5 are closed.

[0051] FIG. 2 is a schematic diagram of the pump system 1 showing a state in which the lubricating oil Lb is cooled.

[0052] When the reciprocating pump 2 starts operating, the control device 37 starts operating the circulation pump 36. As a result, the lubricating oil Lb stored in the external oil reservoir 30 is stored in the internal oil reservoir 207 via the transmission mechanism TM. The lubricating oil Lb stored in the internal oil reservoir 207 is sent to the external oil reservoir 30 via the first liquid feed pipe L6 due to its own weight. At this time, the cooled air CA and the high-temperature air HA are not sent to the heat exchange pipe L3 and the air feed pipe L5. Therefore, the lubricating oil Lb is heated according to the operating time of the reciprocating pump 2.

[0053] Next, when the temperature detected by the temperature sensor 35 rises to a predetermined first temperature (e.g., 70°C), the control device 37 opens the valves V1 and V5 to send the cooling air CA to the heat exchange pipe L3. The cooling air CA sent to the heat exchanger exchanges heat with the lubricating oil Lb through the heat exchange pipe L3. As a result, the temperature of the lubricating oil Lb stored in the external oil reservoir 30 drops. The cooling air CA after heat exchange is exhausted to the external space through the exhaust pipe L4. Here, the first temperature is set, for example, to a temperature lower than the corresponding upper limit temperature of the lubricating oil Lb (e.g., the temperature at which the viscosity of the lubricating oil Lb falls below an appropriate value).

[0054] Next, when the temperature detected by the temperature sensor 35 drops to a predetermined second temperature (for example, 20°C: second temperature < first temperature), the control device 37 closes the valves V1 and V5. As a result, the cooling air CA is no longer sent to the heat exchange pipe L3, and the temperature of the lubricating oil Lb stored in the external oil reservoir 30 rises. Here, the second temperature is set to, for example, a temperature higher than the corresponding lower limit temperature of the lubricating oil Lb (the temperature at which the viscosity of the lubricating oil Lb exceeds an appropriate value).

[0055] FIG. 3 is a schematic diagram of the pump system 1 showing a state in which the lubricating oil Lb is heated.

[0056] Here, when the pump system 1 is used, for example, in a cold region, the temperature detected by the temperature sensor 35 may drop to a predetermined third temperature (e.g., 10°C; third temperature≦second temperature). At this time, the control device 37 opens the valves V2 and V3 (valves V1, V4, and V5 are closed) to send the high-temperature air HA to the heat exchange tube L3. The high-temperature air HA sent to the heat exchange tube L3 exchanges heat with the lubricating oil Lb through the heat exchange tube L3. As a result, the temperature of the lubricating oil Lb stored in the external oil reservoir 30 rises. The high-temperature air HA after heat exchange is exhausted to the external space via the exhaust tube L4. Here, the third temperature is set, for example, to a temperature higher than the corresponding lower limit temperature of the lubricating oil Lb.

[0057] Next, when the temperature detected by the temperature sensor 35 rises to a predetermined first temperature, the control device 37 closes the valves V2 and V3. As a result, the high-temperature air HA is no longer sent to the heat exchange pipe L3, and the temperature of the lubricating oil Lb stored in the external oil reservoir 30 drops.

[0058] In this way, the pump system 1 (temperature adjustment unit 3) switches the flow of air sent to the heat exchange tube L3 between the flow of cooled air CA and the flow of high-temperature air HA by controlling the opening and closing of the valves V1 to V3 and V5 based on the detection result of the temperature sensor 35. As a result, the temperature of the lubricating oil Lb stored in the external oil reservoir 30 is adjusted to fall within the corresponding temperature range of the lubricating oil Lb.

[0059] The first air generator 31 and the second air generator 32 require only compressed air A for their operation and do not require any electrical equipment that could become an ignition source. Therefore, the first air generator 31 and the second air generator 32 individually meet explosion-proof specifications (explosion-proof certification is not required). Therefore, the pump system 1 does not require a fan, heater, or heater control system that meets explosion-proof specifications. In addition, solenoid valves that meet explosion-proof specifications are easy to manufacture and control. As a result, the temperature adjustment unit 3 that meets explosion-proof specifications can be manufactured easily and at low cost.

[0060] FIG. 4 is a schematic diagram of the pump system 1 showing the heat exchange plate 206 in a heated state.

[0061] As described above, the pumped liquid W is a cryogenic liquefied gas. Therefore, during operation of the reciprocating pump 2, the pump chamber 201 and the plunger 25 (pump unit PU), which are in contact with the pumped liquid W, are cooled by the pumped liquid W, and the machine chamber 204 and the connecting chamber 205 are cooled via the pump chamber 201 and the plunger 25. At this time, the heat exchange plate 206 exchanges heat with the outside air. As a result, the cooling of the machine chamber 204 and the connecting chamber 205 is mitigated, and the machine chamber 204 and the connecting chamber 205 are not excessively cooled.

[0062] Here, when the temperature of the treated liquid W is extremely low (for example, when the treated liquid W is liquefied hydrogen (approximately −253°C)), heat exchange by the heat exchange plate 206 becomes insufficient, and the machine chamber 204 and the connecting chamber 205 may become extremely cooled. In this case, the gas (air or a purge gas such as nitrogen gas) in the connecting chamber 205 is cooled, and the gas or components contained in the gas (for example, moisture) may solidify, causing problems such as clogging of the plunger 25. Furthermore, if the connecting chamber 205 is made of a different material from the plunger 25, problems such as excessive tightening of the plunger 25 may occur due to the difference in thermal contraction. Such problems may also occur in the machine chamber 204. On the other hand, even if heat exchange by the heat exchange plate 206 is sufficient, maintaining high temperatures in the machine chamber 204 and the connecting chamber 205 will mitigate cooling of the machine chamber 204 and the connecting chamber 205. Therefore, the pump system 1 has a function of heating (warming) the heat exchange plate 206 using the high-temperature air HA.

[0063] When the heat exchange plate 206 needs to be heated, the control device 37 opens the valves V2 and V4 to send high-temperature air HA to the air supply pipe L5. The high-temperature air HA sent to the air supply pipe L5 is blown onto the heat exchange plate 206 from the other end L5b of the air supply pipe L5. As a result, the heat exchange plate 206 is heated by the high-temperature air HA. As a result, heat exchange by the heat exchange plate 206 is promoted, cooling of the machine chamber 204 and the connecting chamber 205 is alleviated, and the above-mentioned problems do not occur. Here, heating of the heat exchange plate 206 can be performed even when cooling air CA is being sent to the heat exchange pipe L3. In this case, the valves V1, V2, V4, and V5 are open, and the valve V3 is closed. Similarly, heating of the heat exchange plate 206 can be performed even when high-temperature air HA is being sent to the heat exchange pipe L3. In this case, the valves V1 and V5 are closed, and the valves V2 to V4 are open. Furthermore, heating of the heat exchange plate 206 can be performed alternately with heat exchange through the heat exchange tube L3. In this way, in the pump system 1, heat transfer between the pump unit PU and the connecting chamber 205 (machine chamber 204) is mitigated by the high-temperature air HA and the heat exchange plate 206.

[0064] Summary In the above description, the pump system 1 includes a pump unit PU, a motor 21, a transmission mechanism TM, and a temperature adjustment unit 3. The temperature adjustment unit 3 includes a connecting pipe L2, a heat exchange pipe L3, a first air generator 31, and a second air generator 32. The connecting pipe L2 is connected to the first air generator 31, the second air generator 32, and the heat exchange pipe L3, and sends cooled air CA or hot air HA to the heat exchange pipe L3. The heat exchange pipe L3 is in contact with the lubricating oil Lb and exchanges heat with the lubricating oil Lb using the air (cooled air CA, hot air HA) flowing therethrough. The first air generator 31 generates cooled air CA from compressed air A, which is the source of the cooled air CA. The second air generator 32 generates hot air HA from compressed air A, which is the source of the hot air HA. The first air generator 31 generates cooled air CA from compressed air A using the vortex principle, and the second air generator 32 generates hot air HA from compressed air A using the same principle. According to this configuration, the temperature adjustment unit 3 can operate by supplying compressed air A and does not necessarily require a power source for its operation. In other words, the temperature adjustment unit 3 can cool or heat the lubricating oil Lb without requiring a power source. Therefore, the temperature adjustment unit 3 does not require a heater and its control system that meet the required explosion-proof specifications. As a result, the temperature adjustment unit 3 can meet the required explosion-proof specifications at low cost and easily. Therefore, a pump system 1 is provided that includes a temperature adjustment unit 3 for lubricating oil Lb that meets the required explosion-proof specifications.

[0065] In the above description, the temperature adjustment unit 3 includes the first air generator 31. With this configuration, the temperature adjustment unit 3 can generate cooled air CA only by supplying compressed air A. In other words, the temperature adjustment unit 3 can cool the lubricating oil Lb without requiring a power source. Therefore, the temperature adjustment unit 3 can easily comply with the required explosion-proof specifications at low cost.

[0066] In the above description, the temperature adjustment unit 3 includes the second air generator 32, the first switching unit 33, and the second switching unit 34. The first switching unit 33 and the second switching unit 34 switch the air sent to the heat exchange tube L3 between cooled air CA and high-temperature air HA. With this configuration, the temperature adjustment unit 3 can heat the lubricating oil Lb without requiring a power source. As a result, the temperature adjustment unit 3 can adjust the temperature of the lubricating oil Lb to within the corresponding temperature range of the lubricating oil Lb by supplying compressed air A and switching the flow of air sent to the heat exchange tube L3 without requiring a power source. Furthermore, the pump system 1 can be used appropriately even in cold regions where heating of the lubricating oil Lb is required.

[0067] In the above description, the reciprocating pump 2 includes a housing 20 that houses the transmission mechanism TM. The housing 20 includes a machine chamber 204, a connecting chamber 205 that is disposed between the pump chamber 201 and the machine chamber 204 (between the pump unit PU and the transmission mechanism TM), and a heat exchanger plate 206 that reduces heat transfer between the pump unit PU and the connecting chamber 205. The temperature adjustment unit 3 includes an air supply pipe L5 that sends high-temperature air HA generated by the second air generator 32 toward the heat exchanger plate 206. With this configuration, the heat exchanger plate 206 is heated by the high-temperature air HA. Therefore, cooling of the machine chamber 204 and the connecting chamber 205 is reduced, and problems such as clogging of the plunger 25 due to solidification of gas in the machine chamber 204 and the connecting chamber 205 do not occur.

[0068] In the above description, the air supply pipe L5 has the other end L5b arranged to face the heat exchange plate 206. According to this configuration, the heat exchange plate 206 is easily heated by the high-temperature air HA blown from the air supply pipe L5.

[0069] In the above description, the reciprocating pump 2 includes a housing 20 that houses the plunger 25 and the transmission mechanism TM. The temperature adjustment unit 3 includes a circulation unit CU that circulates lubricating oil Lb between the internal oil reservoir 207 and the external oil reservoir 30. The heat exchange pipe L3 is disposed inside the internal oil reservoir 207 so as to be immersed in the lubricating oil Lb. With this configuration, the temperature adjustment unit 3 is disposed outside the reciprocating pump 2. Therefore, although the installation area of the pump system 1 increases, the temperature adjustment unit 3 can be easily maintained. Furthermore, the temperature adjustment unit 3 can be attached to an existing pump or an existing pump system.

[0070] ●Variations● Next, modifications of the pump system of the present invention will be described below, focusing on differences from the embodiment described above (hereinafter referred to as the "first embodiment"). In the following description of the modifications, elements that are the same as those in the first embodiment and elements that have common functions are given the same reference numerals as those in the first embodiment for the sake of convenience, and descriptions thereof will be omitted. In the following description, reference will be made to Figures 1 to 4 as appropriate.

[0071] FIG. 5 is a schematic diagram of a modified example of the pump system according to the present invention.

[0072] A pump system 1Z according to a modified example sucks in, pressurizes, and discharges a treated liquid W. The pump system 1Z is disposed in an explosion-proof area. The pump system 1Z includes a housing 20Z, a motor 21, a rotating shaft 22, a connecting rod 23, a coupling member 24, a plunger 25, a first air generator 31, a second air generator 32, an inlet pipe L1, a connecting pipe L2, a heat exchange pipe L3, an exhaust pipe L4, an air supply pipe L5, a first switching unit 33, a second switching unit 34, a temperature sensor 35, and a control device 37.

[0073] The housing 20Z, the motor 21, the rotary shaft 22, the connecting rod 23, the coupling member 24, and the plunger 25 constitute a reciprocating pump 2Z. The configuration of the reciprocating pump 2Z is the same as that of the reciprocating pump 2, except that the reciprocating pump 2Z is equipped with a temperature sensor 35, a connecting pipe L2, a heat exchange pipe L3, and an exhaust pipe L4. The operation of the reciprocating pump 2Z is the same as that of the reciprocating pump 2.

[0074] The first air generator 31, the second air generator 32, the inlet pipe L1, the connecting pipe L2, the heat exchange pipe L3, the exhaust pipe L4, the air supply pipe L5, the first switching unit 33, the second switching unit 34, the temperature sensor 35, and the control device 37 constitute a temperature adjustment unit 3Z. The configuration of the temperature adjustment unit 3Z is the same as that of the temperature adjustment unit 3, except that the temperature adjustment unit 3Z does not include a circulation unit CU, and that the temperature sensor 35, the connecting pipe L2, the heat exchange pipe L3, and the exhaust pipe L4 are attached to the reciprocating pump 2Z. The operation of the temperature adjustment unit 3Z is the same as that of the temperature adjustment unit 3.

[0075] The housing 20Z accommodates the motor 21, the rotating shaft 22, the connecting rod 23, the coupling member 24, the plunger 25, and the heat exchange pipe L3. The housing 20 is made of metal and includes a pump chamber 201, a suction pipe 202, a discharge pipe 203, a machine chamber 204Z, a coupling chamber 205, a plurality of heat exchange plates 206, and an internal oil reservoir 207Z.

[0076] The configuration of the machine room 204Z is the same as that of the machine room 204, except that the machine room 204Z has a configuration (for example, a through hole: not shown; the same applies below) through which the connection pipe L2 and the exhaust pipe L4 are inserted (penetrated).

[0077] The internal oil reservoir 207Z has a configuration similar to that of the internal oil reservoir 207, except that the internal oil reservoir 207Z accommodates the heat exchange tube L3. The internal oil reservoir 207Z is an example of the oil reservoir defined in the present invention.

[0078] The other end L2c of the connecting pipe L2 is inserted (penetrates) through the housing 20Z (machine chamber 204Z) and is connected to the heat exchange pipe L3.

[0079] The heat exchange tube L3 is housed in the internal oil reservoir 207Z and is immersed in (contacted with) the lubricating oil Lb. That is, the heat exchange tube L3 is disposed inside the internal oil reservoir 207Z. As a result, the cooling air CA or the high-temperature air HA flowing inside the heat exchange tube L3 exchanges heat with the lubricating oil Lb that is in contact with the heat exchange tube L3.

[0080] The other end L4b of the exhaust pipe L4 is inserted (penetrates) through the housing 20Z (machine chamber 204Z) and is disposed in the space outside the housing 20Z.

[0081] The temperature sensor 35 is attached to the housing 20Z (internal oil reservoir 207Z).

[0082] In pump system 1Z, as in pump system 1, the operation of the first switching unit 33 and the second switching unit 34 is controlled so that the temperature of the lubricating oil Lb stored in the internal oil reservoir 207 is adjusted to fall within the corresponding temperature range of the lubricating oil Lb.

[0083] As described above, the pump system 1Z includes a reciprocating pump 2Z and a temperature adjustment unit 3Z. A portion of the temperature adjustment unit 3Z is attached to the reciprocating pump 2Z, and the temperature adjustment unit 3Z is integrated with the reciprocating pump 2Z. Therefore, the pump system 1Z does not require an external oil reservoir 30 and a circulation unit CU, as in the pump system 1, and is therefore smaller in size than the pump system 1. As a result, the installation area of the pump system 1Z is smaller than that of the pump system 1 (for example, approximately two-thirds). Furthermore, the pump system 1Z can be manufactured more cheaply than the pump system 1.

[0084] Furthermore, like the pump system 1, the pump system 1Z does not require a heater that complies with explosion-proof specifications and a control system for the heater.

[0085] Furthermore, in the pump system 1Z, similarly to the pump system 1, the high-temperature air HA sent to the air supply pipe L5 is blown from the other end L5b of the air supply pipe L5 onto the heat exchange plate 206. As a result, the heat exchange plate 206 is heated by the high-temperature air HA. As a result, the cooling of the machine chamber 204 and the connecting chamber 205 is alleviated, and the above-mentioned problems do not occur.

[0086] Other embodiments Next, other embodiments of the present invention will be described below.

[0087] The handled liquid W is not limited to liquefied hydrogen, but may be, for example, liquefied natural gas, liquefied oxygen, or other liquefied gas, water, or high-temperature oil.

[0088] The air supply pipe L5 may be in contact with the connecting chamber 205 and / or the heat exchange plate 206 so as to enable heat exchange between the high-temperature air HA flowing inside the air supply pipe L5 and the connecting chamber 205. That is, for example, the air supply pipe L5 may be wound in a coil shape around the housings 20, 20Z so as to be in contact with the heat exchange plate 206.

[0089] If the heat exchange between the heat exchange plate 206 and the outside air is sufficient (for example, if the temperature of the treated liquid W is relatively high), the temperature adjustment unit 3, 3Z does not need to be provided with the air supply pipe L5. In this case, the second switching unit 34 is not necessary.

[0090] If heating of the lubricating oil Lb is not required (for example, if the pump system 1, 1Z is not located in a cold region, or if the temperature of the lubricating oil Lb converges (equilibriums) within the corresponding temperature range of the lubricating oil Lb using only the cooling air CA), the temperature adjustment unit 3, 3Z does not need to be equipped with the second air generator 32. In this case, the first switching unit 33, the second switching unit 34, the temperature sensor 35, and the control device 37 are not required. Therefore, electrical control is not required to control the temperature adjustment unit 3, 3Z. As a result, the temperature adjustment unit 3, 3Z can comply with the required explosion-proof specifications at lower cost and with greater ease.

[0091] If heating of the lubricating oil Lb is not required, the temperature adjustment unit 3, 3Z may not be provided with the first switching unit 33 and the second switching unit 34. In this case, the connecting pipe L2 may be connected to the first air generator 31, and the air supply pipe L5 may be connected to the second air generator 32. During operation of the pump system 1, 1Z, the cooled air CA is sent to the heat exchange pipes L3, L3Z, and the hot air HA is sent to the air supply pipe L5.

[0092] The lubricating oil Lb stored in the internal oil reservoir 207 may be sent to the external oil reservoir 30 using a known pump instead of relying on gravity.

[0093] The valves V1 to V5 are not limited to solenoid valves. That is, for example, the valves V1 to V5 may be valves that are opened and closed manually. In this case, there is no need for the control device 37 to control the operation of the valves V1 to V5, and electrical control is not required to control the temperature adjustment units 3 and 3Z. As a result, the temperature adjustment units 3 and 3Z can be made to comply with the required explosion-proof specifications at lower cost and with greater ease.

[0094] If the handled liquid W is a high-temperature liquid (e.g., high-temperature oil), the machine chambers 204, 204Z, the connecting chamber 205, the plunger 25, etc. may be excessively heated. In this case, problems such as excessive thermal expansion of these components and a rise in the temperature of the lubricating oil Lb may occur. Therefore, cooled air CA may be sent to the air supply pipe L5 instead of the high-temperature air HA.

[0095] Valves V1, V2 and / or valves V3, V4 may be one three-way valve.

[0096] The shape of the heat exchange tube L3 is not limited to a coil shape as long as the heat exchange tube L3 can efficiently exchange heat with the lubricating oil Lb.

[0097] The temperature adjustment units 3 and 3Z may not necessarily include the temperature sensor .

[0098] The cooled air CA or the hot air HA may be constantly (continuously) fed to the heat exchange tube L3 while the pump system 1 is in operation, or may be fed intermittently.

[0099] The pump system 1, 1Z may include a plurality of reciprocating pumps 2, 2Z. In this case, the air supply pipe L5 may be provided for each of the reciprocating pumps 2, 2Z.

[0100] The temperature adjustment unit 3, 3Z may include three or more air generators.

[0101] A heat exchange plate 206 may be disposed in the connecting chamber 205 .

[0102] ●Embodiments of the present invention● Next, embodiments of the present invention that can be understood from the above-described embodiments and modifications will be described below, using the terms and symbols described in the embodiments and modifications.

[0103] A first embodiment of the present invention comprises a pump unit (e.g., pump unit PU) that sucks in, pressurizes, and discharges a treated liquid (e.g., treated liquid W), a power unit (e.g., motor 21) that generates power required for the operation of the pump unit, a transmission mechanism (e.g., transmission mechanism TM) that transmits the power generated by the power unit to the pump unit, and a temperature adjustment unit (e.g., temperature adjustment unit 3, 3Z) that adjusts the temperature of lubricating oil (e.g., lubricating oil Lb) used to lubricate the transmission mechanism, and the pump unit comprises a plunger (e.g., plunger 25) that reciprocates by the power, and a pump chamber (e.g., pump chamber 201) that accommodates the plunger, The adjustment unit includes a heat exchange tube (e.g., heat exchange tube L3) that is arranged to be in contact with the lubricating oil and exchanges heat with the lubricating oil using air flowing inside, at least one air generator (e.g., first air generator 31, second air generator 32) that generates heated or cooled air (e.g., cooled air CA, high-temperature air HA) from compressed air (e.g., compressed air A) that is the source of the air, and a connecting tube (e.g., connecting tube L2) that is connected to the air generator and the heat exchange tube and sends the air generated by the air generator to the heat exchange tube, and the air generator is a pump system (e.g., pump system 1, 1Z) that generates the air from the compressed air using the vortex principle. According to this configuration, the temperature adjustment unit can easily comply with the required explosion-proof specifications at low cost, thereby providing a pump system equipped with a temperature adjustment unit for lubricating oil that complies with explosion-proof specifications.

[0104] A second embodiment of the present invention is a pump system in which, in the first embodiment, the temperature control unit is provided with a cooled air generator (e.g., a first air generator 31) as the air generator, which generates cooled air (e.g., cooled air CA) from the compressed air. With this configuration, the temperature adjustment unit can cool the lubricating oil without requiring a power source.

[0105] A third embodiment of the present invention is a pump system in which, in the second embodiment, the temperature adjustment unit includes, as the air generator, a heated air generator (e.g., second air generator 32) that generates heated air (e.g., high-temperature air HA) from the compressed air, and a switching unit (e.g., first switching unit 33, second switching unit 34) that switches the flow of air sent to the heat exchange tube to either the flow of cooled air or the flow of heated air. With this configuration, the temperature adjustment unit can adjust the temperature of the lubricant to within the temperature range supported by the lubricant without requiring a power source.

[0106] A fourth embodiment of the present invention is a pump system in the third embodiment, which comprises a housing (e.g., housing 20, 20Z) that houses the transmission mechanism, the housing comprising: a machine chamber (e.g., machine chamber 204) that houses the transmission mechanism; a connecting chamber (e.g., connecting chamber 205) that is arranged between the pump unit and the machine chamber and connects the pump unit and the machine chamber; and a heat exchange plate (e.g., heat exchange plate 206) that reduces heat transfer between the pump unit and the connecting chamber, and the temperature adjustment unit comprising an air supply pipe (e.g., air supply pipe L5) that sends the air generated by the air generator so that the air is heat exchanged with the heat exchange plate. With this configuration, the cooling of the machine chamber and the connecting chamber is eased.

[0107] A fifth embodiment of the present invention is the pump system of the fourth embodiment, wherein the air supply pipe has an open end (for example, the other end L5b) arranged so as to face the heat exchange plate. With this configuration, the heat exchange plate is easily heated.

[0108] A sixth embodiment of the present invention is a pump system (e.g., pump system 1Z) which, in any one of the first to third embodiments, comprises a housing (e.g., housing 20Z) that houses the transmission mechanism, the housing having an oil reservoir (e.g., internal oil reservoir 207Z) that temporarily stores the lubricating oil, and the pump chamber, and the heat exchange tube is arranged inside the oil reservoir. This configuration reduces the installation area of the pump system.

[0109] A seventh embodiment of the present invention is a pump system (e.g., pump system 1) which, in any one of the first to third embodiments, comprises a housing (e.g., housing 20) that accommodates the transmission mechanism, the temperature control unit (e.g., temperature control unit 3) comprises an oil reservoir (e.g., external oil reservoir 30) that temporarily stores the lubricating oil, and a circulation unit (e.g., circulation unit CU) that is connected to the housing and the oil reservoir and circulates the lubricating oil between the housing and the oil reservoir, and the heat exchange tube is arranged inside the oil reservoir. With this configuration, the temperature adjustment unit can be attached to an existing pump or an existing pump system. [Explanation of symbols]

[0110] 1. Pump System 2 Reciprocating Pump 20 Case 201 Pump Room 204 Machine room 205 Connection room 206 Heat exchange plate 207 Internal oil reservoir (oil reservoir) 21 Motor (power unit) 22 Rotating shaft (transmission mechanism) 23 Connecting rod (transmission mechanism) 24 Connecting member (transmission mechanism) 25 plunger 3 Temperature control unit 30 External oil reservoir (oil reservoir) 31 First air generator (air generator) 32 Second air generator (air generator) 33 First switching unit (switching unit) 34 Second switching unit (switching unit) 36 Circulation pump (circulation unit) L2 connecting pipe L3 heat exchange tube L5 air supply pipe L5b Other end (open end) L6 First liquid supply pipe (circulation unit) L7 Second liquid supply pipe (circulation unit) A. Compressed air CA Cooling Air CU Circulation Unit HA Hot Air Lb lubricant PU pump unit TM transmission mechanism W Handling fluid 1Z Pump System 2Z Reciprocating Pump 20Z chassis 207Z Internal Oil Reservoir (Oil Reservoir) 3Z Temperature Control Unit

Claims

1. a pump unit that sucks in, pressurizes, and discharges the pumped liquid; a power unit that generates power necessary for the operation of the pump unit; a transmission mechanism that transmits the power generated by the power unit to the pump unit; a temperature adjustment unit for adjusting the temperature of lubricating oil used to lubricate the transmission mechanism; and The pump unit comprises: a plunger that reciprocates due to the power; a pump chamber that accommodates the plunger; With The temperature adjustment unit is a heat exchange tube arranged to be in contact with the lubricating oil and exchanging heat with the lubricating oil by air flowing therethrough; At least one air generator that generates the heated or cooled air from compressed air that is the source of the air; a connecting pipe connected to the air generator and the heat exchange tube, for sending the air generated by the air generator to the heat exchange tube; With The air generator generates the air from the compressed air using the vortex principle. Pump system.

2. The temperature adjustment unit is the air generator is a cooled air generator that generates cooled air from the compressed air; Equipped with The pump system of claim 1 .

3. The temperature adjustment unit is As the air generator, a heated air generator that generates heated air from the compressed air; a switching unit that switches the flow of air sent to the heat exchange tube between the cooled air flow and the heated air flow; Equipped with The pump system of claim 2 .

4. a housing that houses the transmission mechanism; and The housing includes: a machine room that houses the transmission mechanism; a connecting chamber disposed between the pump unit and the machine chamber, connecting the pump unit and the machine chamber; a heat exchange plate that reduces heat transfer between the pump unit and the connecting chamber; With The temperature adjustment unit is an air supply pipe for sending the air generated by the air generator so that the air exchanges heat with the heat exchange plate; Equipped with The pump system of claim 3 .

5. The air supply pipe is an open end disposed opposite the heat exchange plate; Equipped with The pump system of claim 4.

6. a housing that houses the transmission mechanism; and The housing includes: an oil reservoir tank for temporarily storing the lubricating oil; the pump chamber; With The heat exchange tube is disposed inside the oil reservoir. A pump system according to any one of claims 1 to 3.

7. a housing that houses the transmission mechanism; and The temperature adjustment unit is an oil reservoir tank for temporarily storing the lubricating oil; a circulation unit connected to the housing and the oil reservoir tank to circulate the lubricating oil between the housing and the oil reservoir tank; With The heat exchange tube is disposed inside the oil reservoir. A pump system according to any one of claims 1 to 3.

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