Defrosting air conditioning system with non-stop indoor unit

Abstract

The utility model relates to the technical field of air conditioners, in particular to an indoor unit non-stop defrosting air conditioning system. The air conditioning system comprises a compressor, an indoor unit, a flash tank, a first outdoor unit, a second outdoor unit, a first control valve, a second control valve, a first four-way valve, a second four-way valve, a first electronic expansion valve and a second electronic expansion valve. According to the scheme, through reasonable arrangement, one outdoor unit is controlled to defrost and the other outdoor unit is controlled to be matched with the indoor unit to heat in the refrigeration mode, so that the indoor unit can still supply heat normally during defrosting, and the user satisfaction degree is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an air conditioner system for defrosting an internal unit without stopping. Background Art

[0002] Most of today's air conditioners are defrosted in winter by shutting down the indoor unit and switching to refrigeration mode for defrosting. This method has large capacity fluctuations and often causes problems with insufficient heat supply due to unit defrosting, resulting in a poor user experience. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide an air-conditioning system with non-stop defrosting of the indoor unit. Two outdoor units are arranged in the system. In the cooling mode, one outdoor unit is controlled to defrost, and the other outdoor unit cooperates with the indoor unit to heat. This solves the problem of insufficient heating caused by the shutdown of the indoor unit when the existing system is in the defrost mode.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] An air conditioning system for defrosting indoor units without stopping, characterized in that: the air conditioning system comprises a compressor, an indoor unit, a flash tank, a first outdoor unit, a second outdoor unit, a first control valve, a second control valve, a first four-way valve, a second four-way valve, a first electronic expansion valve and a second electronic expansion valve; wherein,

[0006] The first four-way valve has valve ports C1, D1, E1 and S1, and the second four-way valve has valve ports C2, D2, E2 and S2;

[0007] The compressor exhaust port is connected to the valve port D1 through a first pipeline, and the first control valve is arranged on the first pipeline; a second pipeline connected to the valve port D2 is provided on the first pipeline between the compressor exhaust port and the first control valve; the compressor suction port is connected to the valve port S2 through a third pipeline; the first pipeline is connected to a fourth pipeline connected to the third pipeline between the first control valve and the first four-way valve, and the second control valve is arranged on the fourth pipeline;

[0008] The valve port C1 is connected to the inlet end of the first outdoor unit, and the valve port E1 is connected to the inlet end of the second outdoor unit; the outlet end of the first outdoor unit and the outlet end of the second outdoor unit are respectively connected to a fifth pipeline and a sixth pipeline extending into the bottom of the flash tank; the first electronic expansion valve and the second electronic expansion valve are respectively arranged on the fifth pipeline and the sixth pipeline;

[0009] The valve port S1 is connected to the valve port C2; the valve port E2 is connected to the inlet end of the indoor unit; the outlet end of the indoor unit is connected to a seventh pipe extending into the bottom of the flash tank;

[0010] When the air conditioning system is in defrost mode, the first control valve is opened and the second control valve is closed.

[0011] Preferably, the first outdoor unit is in defrosting mode and the second outdoor unit is in heating mode; the refrigerant coming out of the compressor exhaust port is divided into two paths, the first refrigerant passes through the first control valve, valve port D1, valve port C1, the first outdoor unit, the first electronic expansion valve to the flash tank in sequence, and the first outdoor unit defrosts; the second refrigerant passes through the valve port D2, valve port E2, the indoor unit, the flash tank, the second electronic expansion valve, the second outdoor unit, valve port E1, valve port S1, valve port C2, valve port S2 to the compressor in sequence, and the second outdoor unit heats.

[0012] Preferably, the second outdoor unit is in defrost mode and the first outdoor unit is in heating mode; the refrigerant coming out of the compressor exhaust port is divided into two paths, the first refrigerant passes through the first control valve, valve port D1, valve port E1, the second outdoor unit, the second electronic expansion valve to the flash tank in sequence, and the second outdoor unit defrosts; the second refrigerant passes through the valve port D2, valve port E2, the indoor unit, the flash tank, the first electronic expansion valve, the first outdoor unit, valve port C1, valve port S1, valve port C2, valve port S2 to the compressor in sequence, and the first outdoor unit heats.

[0013] Preferably, a third electronic expansion valve is provided on the seventh pipeline.

[0014] Preferably, an air supply port of the compressor is connected to an air supply pipeline which is in communication with the air port of the flash tank, and a two-way valve is provided on the air supply pipeline.

[0015] Preferably, a liquid storage tank is provided on the third pipeline.

[0016] The utility model adopts the above technical solution and sets two outdoor units in the air-conditioning system. Through reasonable arrangement, one outdoor unit is controlled to defrost in the cooling mode, and the other outdoor unit cooperates with the indoor unit to heat, so that the indoor unit can still provide heat normally during defrosting, thereby improving user satisfaction.

[0017] Specifically, in the normal heating mode of the air-conditioning system: the first control valve is closed, the second control valve is opened, the exhaust gas of the compressor enters the second four-way valve, enters the indoor unit from valve ports D2 and E2 for heat exchange, and then enters the flash tank through the third electronic expansion valve. The gas returns to the compressor, and the liquid passes through the first electronic expansion valve and the second electronic expansion valve, and enters the first outdoor unit and the second indoor unit respectively. The gas of the first outdoor unit enters the compressor return air from valve ports C1, D1 and the second control valve. The gas of the second outdoor unit enters the second four-way valve C2 and S2 from valve ports E1 and S1, and enters the compressor return air to complete normal heating.

[0018] In the normal cooling mode of the air-conditioning system: the first control valve is opened, the second control valve is closed, and the exhaust gas of the compressor is split. One part enters the first outdoor unit through the valve ports D1 and C1 of the first four-way valve, and the other part enters the valve ports S1 and E1 of the first four-way valve through the valve ports D2 and C2 of the second four-way valve, and then enters the second outdoor unit, and then enters the flash tank through the throttling of the first and second electronic expansion valves, and then enters the throttling of the third electronic expansion valve, enters the indoor unit for evaporative cooling, and enters the compressor return air through the valve ports E2 and S2 of the second four-way valve, and recirculates.

[0019] The air conditioning system is in defrost mode:

[0020] ① The first outdoor unit defrosts, and the second outdoor unit heats; the first control valve opens, and the second control valve closes; the compressor exhaust is split, passing through the first control valve and the second four-way valve respectively.

[0021] Heating process of the second outdoor unit: The gas enters the indoor unit through the valve ports D2 and E2 of the second four-way valve and changes into gas-liquid two-phase, and enters the flash tank through the third electronic expansion valve. The gas is replenished into the compressor, and the liquid (two inlets and one outlet, i.e. two inlets and one outlet) enters the second outdoor unit through the second electronic expansion valve (the electronic expansion valve controls the pipeline pressure and does not flow into the first electronic expansion valve), enters the valve ports C2 and S2 of the second four-way valve through the valve ports E1 and S1 of the first four-way valve, and then returns to the compressor.

[0022] The defrosting process of the first outdoor unit: the exhaust gas of the compressor is divided into two parts, passes through the first control valve and enters the valve ports D1 and C1 of the first four-way valve, flows into the first outdoor unit for defrosting, and then enters the first electronic expansion valve (the pressure discharged into the flash tank is controlled by the electronic expansion valve to make it the same as the pressure at the inlet end of the indoor unit, forming two inlets and one outlet), flows into the flash tank, and is combined with the indoor unit side, forming two inlets and one outlet.

[0023] ② The second outdoor unit defrosts and the first outdoor unit heats; the first control valve opens and the second control valve closes; the compressor exhaust is split and flows through the first control valve and the second four-way valve respectively.

[0024] Heating process of the first outdoor unit: The gas enters the indoor unit through the valve ports D2 and E2 of the second four-way valve and changes into gas-liquid two-phase, and enters the flash tank through the third electronic expansion valve. The gas is replenished into the compressor, and the liquid (two-in and one-out) enters the first outdoor unit through the first electronic expansion valve (the electronic expansion valve controls the pipeline pressure and does not flow into the second electronic expansion valve), enters the valve ports C2 and S2 of the second four-way valve through the first four-way valve C1 and S1, and then returns to the compressor.

[0025] The second outdoor unit defrost process: the compressor exhaust flow passes through the first control valve into the first four-way valve D1 and E1, flows into the second outdoor unit for defrosting, and then enters the second electronic expansion valve (the pressure discharged into the flash tank is controlled by the electronic expansion valve to make it the same as the pressure at the inlet end of the indoor unit, forming two inlets and one outlet) and flows into the flash tank, and is combined with the indoor unit side, two inlets and one outlet.

[0026] It should be noted here that when the system is in defrost mode, the pressure of one of the control pipes of the first electronic expansion valve and the second electronic expansion valve is the same as that of the seventh pipe, and the pressure of the other control pipe is lower than the first two to form an effective refrigerant flow with two inlets and one outlet.

[0027] In addition, if the condenser is divided into two parts, the heat will not interfere with each other and can be placed in one outdoor unit. When the outdoor unit is connected to the air-conditioning system, the two condensers are equivalent to the first outdoor unit and the second outdoor unit mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a refrigerant flow chart for defrosting the first outdoor unit and heating the second outdoor unit in the air-conditioning system.

[0029] Figure 2 This is a refrigerant flow chart for defrosting the second outdoor unit and heating the first outdoor unit in the air-conditioning system. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figure 1~2 The air conditioning system shown in the figure is a non-stop defrosting air conditioning system for indoor units, the air conditioning system comprises a compressor 1, an indoor unit 2, a flash tank 3, a first outdoor unit 4, a second outdoor unit 5, a first control valve 6, a second control valve 7, a first four-way valve 8, a second four-way valve 9, a first electronic expansion valve 16 and a second electronic expansion valve 17; wherein,

[0036] The first four-way valve 8 has valve ports C1, D1, E1 and S1, and the second four-way valve 9 has valve ports C2, D2, E2 and S2;

[0037] The exhaust port of the compressor 1 is connected to the valve port D1 through the first pipeline 10, and the first control valve 6 is arranged on the first pipeline 10; the first pipeline 10 is provided with a second pipeline 11 connected to the valve port D2 between the exhaust port of the compressor 1 and the first control valve 6; the suction port of the compressor 1 is connected to the valve port S2 through the third pipeline 12; the first pipeline 10 is provided with a fourth pipeline 13 connected to the third pipeline 12 between the first control valve 6 and the first four-way valve 8, and the second control valve 7 is arranged on the fourth pipeline 13;

[0038] The valve port C1 is communicated with the inlet end of the first outdoor unit 4, and the valve port E1 is communicated with the inlet end of the second outdoor unit 5; the outlet end of the first outdoor unit 4 and the outlet end of the second outdoor unit 5 are respectively connected to a fifth pipeline 14 and a sixth pipeline 15 extending into the bottom of the flash tank 3; the first electronic expansion valve 16 and the second electronic expansion valve 17 are respectively arranged on the fifth pipeline 14 and the sixth pipeline 15;

[0039] The valve port S1 is connected to the valve port C2; the valve port E2 is connected to the inlet end of the indoor unit 2; the outlet end of the indoor unit 2 is connected to a seventh pipe 18 extending into the bottom of the flash tank 3;

[0040] When the air conditioning system is in defrosting mode, the first control valve 6 is opened and the second control valve 7 is closed.

[0041] Furthermore, the first outdoor unit 4 is in defrosting mode, and the second outdoor unit 5 is in heating mode; the refrigerant coming out of the exhaust port of the compressor 1 is divided into two paths, the first refrigerant passes through the first control valve 6, valve port D1, valve port C1, the first outdoor unit 4, the first electronic expansion valve 16 to the flash tank 3 in sequence, and the first outdoor unit 4 defrosts; the second refrigerant passes through the valve port D2, valve port E2, the indoor unit 2, the flash tank 3, the second electronic expansion valve 17, the second outdoor unit 5, valve port E1, valve port S1, valve port C2, valve port S2 to the compressor 1 in sequence, and the second outdoor unit 5 heats.

[0042] Furthermore, the second outdoor unit 5 is in defrosting mode, and the first outdoor unit 4 is in heating mode; the refrigerant coming out of the exhaust port of the compressor 1 is divided into two paths, the first path of refrigerant passes through the first control valve 6, valve port D1, valve port E1, the second outdoor unit 5, the second electronic expansion valve 17 to the flash tank 3 in sequence, and the second outdoor unit 5 defrosts; the second path of refrigerant passes through the valve port D2, valve port E2, the indoor unit 2, the flash tank 3, the first electronic expansion valve 16, the first outdoor unit 4, valve port C1, valve port S1, valve port C2, valve port S2 to the compressor 1 in sequence, and the first outdoor unit 4 heats.

[0043] Furthermore, a third electronic expansion valve 19 is provided on the seventh pipeline 18 .

[0044] Furthermore, an air supply port of the compressor 1 is connected to an air supply pipeline 20 which is in communication with the air port of the flash tank 3 , and a two-way valve 21 is disposed on the air supply pipeline 20 .

[0045] Furthermore, a liquid storage tank 22 is provided on the third pipeline 12 .

[0046] In this specific embodiment, in order to address the problem that when the existing heat pump or air-conditioning system is defrosted in the cooling mode, the indoor unit stops working, resulting in insufficient heat supply, the above-mentioned scheme is achieved by setting two outdoor units in the air-conditioning system. Through reasonable arrangement, one outdoor unit is controlled to defrost in the cooling mode, and the other outdoor unit cooperates with the indoor unit to heat. In this way, the indoor unit can still provide heat normally during defrosting, thereby improving user satisfaction.

[0047] Specifically, in the normal heating mode of the air-conditioning system: the first control valve is closed, the second control valve is opened, the exhaust gas of the compressor enters the second four-way valve, enters the indoor unit from valve ports D2 and E2 for heat exchange, and then enters the flash tank through the third electronic expansion valve. The gas returns to the compressor, and the liquid passes through the first electronic expansion valve and the second electronic expansion valve, and enters the first outdoor unit and the second indoor unit respectively. The gas of the first outdoor unit enters the compressor return air from valve ports C1, D1 and the second control valve. The gas of the second outdoor unit enters the second four-way valve C2 and S2 from valve ports E1 and S1, and enters the compressor return air to complete normal heating.

[0048] In the normal cooling mode of the air-conditioning system: the first control valve is opened, the second control valve is closed, and the exhaust gas of the compressor is split. One part enters the first outdoor unit through the valve ports D1 and C1 of the first four-way valve, and the other part enters the valve ports S1 and E1 of the first four-way valve through the valve ports D2 and C2 of the second four-way valve, and then enters the second outdoor unit, and then enters the flash tank through the throttling of the first and second electronic expansion valves, and then enters the throttling of the third electronic expansion valve, enters the indoor unit for evaporative cooling, and enters the compressor return air through the valve ports E2 and S2 of the second four-way valve, and recirculates.

[0049] The air conditioning system is in defrost mode:

[0050] ① The first outdoor unit defrosts, and the second outdoor unit heats; the first control valve opens, and the second control valve closes; the compressor exhaust is split, passing through the first control valve and the second four-way valve respectively.

[0051] Heating process of the second outdoor unit: The gas enters the indoor unit through the valve ports D2 and E2 of the second four-way valve and changes into gas-liquid two-phase, and enters the flash tank through the third electronic expansion valve. The gas is replenished into the compressor, and the liquid (two inlets and one outlet, i.e. two inlets and one outlet) enters the second outdoor unit through the second electronic expansion valve (the electronic expansion valve controls the pipeline pressure and does not flow into the first electronic expansion valve), enters the valve ports C2 and S2 of the second four-way valve through the valve ports E1 and S1 of the first four-way valve, and then returns to the compressor.

[0052] The defrosting process of the first outdoor unit: the exhaust gas of the compressor is divided into two parts, passes through the first control valve and enters the valve ports D1 and C1 of the first four-way valve, flows into the first outdoor unit for defrosting, and then enters the first electronic expansion valve (the pressure discharged into the flash tank is controlled by the electronic expansion valve to make it the same as the pressure at the inlet end of the indoor unit, forming two inlets and one outlet), flows into the flash tank, and is combined with the indoor unit side, forming two inlets and one outlet.

[0053] ② The second outdoor unit defrosts and the first outdoor unit heats; the first control valve opens and the second control valve closes; the compressor exhaust is split and flows through the first control valve and the second four-way valve respectively.

[0054] Heating process of the first outdoor unit: The gas enters the indoor unit through the valve ports D2 and E2 of the second four-way valve and changes into gas-liquid two-phase, and enters the flash tank through the third electronic expansion valve. The gas is replenished into the compressor, and the liquid (two-in and one-out) enters the first outdoor unit through the first electronic expansion valve (the electronic expansion valve controls the pipeline pressure and does not flow into the second electronic expansion valve), enters the valve ports C2 and S2 of the second four-way valve through the first four-way valve C1 and S1, and then returns to the compressor.

[0055] The second outdoor unit defrost process: the compressor exhaust flow passes through the first control valve into the first four-way valve D1 and E1, flows into the second outdoor unit for defrosting, and then enters the second electronic expansion valve (the pressure discharged into the flash tank is controlled by the electronic expansion valve to make it the same as the pressure at the inlet end of the indoor unit, forming two inlets and one outlet) and flows into the flash tank, and is combined with the indoor unit side, two inlets and one outlet.

[0056] It should be noted here that when the system is in defrost mode, the pressure of one of the control pipes of the first electronic expansion valve and the second electronic expansion valve is the same as that of the seventh pipe, and the pressure of the other control pipe is lower than the first two to form an effective refrigerant flow with two inlets and one outlet.

[0057] In addition, if the condenser is divided into two parts, the heat will not interfere with each other and can be placed in one outdoor unit. When the outdoor unit is connected to the air-conditioning system, the two condensers are equivalent to the first outdoor unit and the second outdoor unit mentioned above.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An air conditioning system for defrosting an indoor unit without stopping, characterized in that: The air conditioning system comprises a compressor (1), an indoor unit (2), a flash tank (3), a first outdoor unit (4), a second outdoor unit (5), a first control valve (6), a second control valve (7), a first four-way valve (8), a second four-way valve (9), a first electronic expansion valve (16) and a second electronic expansion valve (17); wherein: The first four-way valve (8) has valve ports C1, D1, E1 and S1, and the second four-way valve (9) has valve ports C2, D2, E2 and S2; The exhaust port of the compressor (1) is connected to the valve port D1 through a first pipe (10), and the first control valve (6) is arranged on the first pipe (10); a second pipe (11) connected to the valve port D2 is provided on the first pipe (10) between the exhaust port of the compressor (1) and the first control valve (6); the air intake port of the compressor (1) is connected to the valve port S2 through a third pipe (12); the first pipe (10) is connected to a fourth pipe (13) connected to the third pipe (12) between the first control valve (6) and the first four-way valve (8), and the second control valve (7) is arranged on the fourth pipe (13); The valve port C1 is in communication with the inlet end of the first outdoor unit (4), and the valve port E1 is in communication with the inlet end of the second outdoor unit (5); the outlet end of the first outdoor unit (4) and the outlet end of the second outdoor unit (5) are respectively connected to a fifth pipe (14) and a sixth pipe (15) which extend into the bottom of the flash tank (3); the first electronic expansion valve (16) and the second electronic expansion valve (17) are respectively arranged on the fifth pipe (14) and the sixth pipe (15); The valve port S1 is in communication with the valve port C2; the valve port E2 is in communication with the inlet end of the indoor unit (2); the outlet end of the indoor unit (2) is connected to a seventh pipe (18) extending into the bottom of the flash tank (3); When the air conditioning system is in defrosting mode, the first control valve (6) is opened and the second control valve (7) is closed.

2. The air conditioning system for defrosting an indoor unit without stopping according to claim 1, characterized in that: The first outdoor unit (4) is in a defrosting mode, and the second outdoor unit (5) is in a heating mode; the refrigerant from the exhaust port of the compressor (1) is divided into two paths, the first path of refrigerant passes through the first control valve (6), valve port D1, valve port C1, the first outdoor unit (4), the first electronic expansion valve (16) to the flash tank (3), and the first outdoor unit (4) defrosts; the second path of refrigerant passes through the valve port D2, valve port E2, the indoor unit (2), the flash tank (3), the second electronic expansion valve (17), the second outdoor unit (5), valve port E1, valve port S1, valve port C2, valve port S2 to the compressor (1), and the second outdoor unit (5) heats.

3. The air conditioning system for defrosting an indoor unit without stopping according to claim 1, characterized in that: The second outdoor unit (5) is in a defrosting mode, and the first outdoor unit (4) is in a heating mode; the refrigerant from the exhaust port of the compressor (1) is divided into two paths, the first path of refrigerant passes through the first control valve (6), valve port D1, valve port E1, the second outdoor unit (5), the second electronic expansion valve (17) to the flash tank (3), and the second outdoor unit (5) defrosts; the second path of refrigerant passes through the valve port D2, valve port E2, the indoor unit (2), the flash tank (3), the first electronic expansion valve (16), the first outdoor unit (4), valve port C1, valve port S1, valve port C2, valve port S2 to the compressor (1), and the first outdoor unit (4) heats.

4. The air conditioning system for defrosting an indoor unit without stopping according to claim 1, characterized in that: The seventh pipeline (18) is provided with a third electronic expansion valve (19).

5. The air conditioning system for defrosting an indoor unit without stopping according to claim 1, characterized in that: An air supply pipe (20) is provided at the air supply port of the compressor (1) and is in communication with the air port of the flash tank (3). A two-way valve (21) is provided on the air supply pipe (20).

6. The air conditioning system for defrosting an indoor unit without stopping according to claim 1, characterized in that: A liquid storage tank (22) is provided on the third pipeline (12).

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