CN103075760B - Hydraulic equilibrium control system of secondary network of centralized heat-supply network and control method thereof - Google Patents

Hydraulic equilibrium control system of secondary network of centralized heat-supply network and control method thereof Download PDF

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CN103075760B
CN103075760B CN201310037474.9A CN201310037474A CN103075760B CN 103075760 B CN103075760 B CN 103075760B CN 201310037474 A CN201310037474 A CN 201310037474A CN 103075760 B CN103075760 B CN 103075760B
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control valve
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water temperature
aperture
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CN103075760A (en
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黄鸾
董现海
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TIANJIN THERMAL POWER DESIGNING INSTITUTE CO., LTD.
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Abstract

The invention relates to a hydraulic equilibrium control system of a secondary network of a centralized heat-supply network and a control method thereof. The hydraulic equilibrium control system of the secondary network of the centralized heat-supply network is characterized by comprising a long-distance central computer control unit and a plurality of horizontal hydraulic disorder control units corresponding to buildings. Each control unit comprises a GPRS (General Packet Radio Service) communicator at the entrance of the corresponding building, a local measurement and control terminal, an electric adjusting valve on a building water supply pipe, a water return temperature sensor on a building water return pipe, and an operated type differential pressure control valve of the building; and an operated type differential pressure control valve of a user is arranged on a user water return pipe inside the building. The control method comprises the following steps of: A, manually and initially adjusting horizontal hydraulic disorder; B, automatically and adaptively adjusting the horizontal hydraulic disorder: calculating a set value t of a building water return temperature by the central computer control unit according to an outdoor temperature, and collecting a building water return temperature T and openness data of an electric adjusting valve, and calculating a deviation value deltaT by each measurement and control terminal, so as to control openness of the electric adjusting valve; and C, manually adjusting vertical hydraulic disorder. The hydraulic equilibrium control system of the secondary network of the centralized heat-supply network and the control method thereof provided by the invention have the advantages that uniform heat supply is ensured, energy is saved, and consumption is reduced.

Description

Central heating network secondary network hydraulic equilibrium control system and control method thereof
Technical field
The present invention relates to a kind of central heating network control system, particularly relate to a kind of central heating network secondary network hydraulic equilibrium control system and control method thereof.
Background technology
Along with social technology progress and expanding economy, central heating network development rapidly, for vast heating user provides cosy living environment, but in heating system is run, on the hydraulic balancing regulation of secondary network, especially still there is adjustment problem not in place, directly affect user's heating effect.Hydraulically balanced adjustment comprises the adjustment of adjustment and vertical hydraulic misadjustment to horizontal hydraulic imbalance, and horizontal hydraulic imbalance refers to the hydraulic misadjustment between each building, and vertical hydraulic misadjustment refers to the hydraulic misadjustment between a building levels.The hydraulically balanced adjustment of current secondary network mainly relies on building and user place and installs Self-operated flow limiting valve additional and carry out maximum restriction to user with heat, and its result can only realize the hydraulically balanced preliminary adjustment of secondary network,
The accommodation adapting to actual operating mode change can not be carried out, the requirement of even distribution heating cannot be met.
Especially current, popularization heating system being taked to thermal neasuring along with country, has lost the practicality of use, can not meet heat demand based on the Self-operated flow limiting valve limited flow; In addition, for realizing saving energy and reduce the cost, the energy loss because causing the difference of user's heating load is avoided, the hydraulically balanced effective adjustment of secondary network in the urgent need to address.
Given this, research and development central heating network secondary network hydraulic equilibrium control system and control method thereof, improve the hydraulically balanced Adjustment effect of secondary network, meet the demand taking the heating system of thermal neasuring, and realize the hydraulically balanced automatic adaptation adjustment of secondary network, realize even distribution heating, become the problem that heating field is paid close attention to.
Summary of the invention
Main purpose of the present invention is for the problems referred to above, a kind of central heating network secondary network hydraulic equilibrium control system and control method thereof are provided, by take hand control and automation combine to secondary network hydraulic equilibrium achieve automatically adapt to adjustment, ensure that heating system is normal, even distribution heating, and then improve the comfortableness of user's heat, and reach energy conservation and consumption reduction effects.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of central heating network secondary network hydraulic equilibrium control system, it is characterized in that the some and each building corresponding horizontal hydraulic Offset control unit arranged comprising distant central computer control unit and control thereof, described horizontal hydraulic Offset control unit comprises the GPRS communicator being arranged on a building entrance be connected with described distant central computer control unit, local detection and control terminal, the electric control valve be arranged on a building entrance building feed pipe be connected with described detection and control terminal, be separately positioned on the return water temperature sensor on a building entrance building return pipe and a building self-power differential pressure control valve, on the water outlet side building return pipe that two pressure guiding pipes of a described building self-power differential pressure control valve are connected to this valve and an electric control valve influent side building feed pipe, and in building, each user entry user return pipe arranging the user's self-power differential pressure control valve controlling vertical hydraulic misadjustment, two pressure guiding pipes of described user's self-power differential pressure control valve are connected on user's feed pipe of this valve water outlet side user's return pipe and user entry.
Apply the method that above-mentioned central heating network secondary network hydraulic equilibrium control system carries out hydraulic equilibrium control, it is characterized in that comprising the steps:
A, manually preliminary adjustment horizontal hydraulic imbalance:
Manually set the differential pressure value of the building self-power differential pressure control valve on a building return pipe, realize the preliminary adjustment of horizontal hydraulic imbalance;
B, adaptation adjustment horizontal hydraulic imbalance automatically:
(1). central computer control unit calculates a building return water temperature setting value t according to outdoor temperature, and judges whether communication system has fault:
(1.1). when communication system is normal, then start Long-distance Control, detection and control terminal receives a building return water temperature setting value t of central computer control unit, and enters step (2);
(1.2). when communication system has fault, then start local control, enter step (3);
(2). detection and control terminal gathers the aperture data of a building return water temperature T and electric control valve and is uploaded to central computer control unit; And a building return water temperature setting value t for the central computer control unit of the building of a collection return water temperature T and reception is carried out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, control the aperture of electric control valve:
(2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(2.3). as deviate △ T=0, the aperture of electric control valve is remained stationary state;
(3). detection and control terminal gathers the aperture data of a building return water temperature T and electric control valve; Judge whether to receive a building return water temperature setting value t:
(3.1) when receiving building return water temperature setting value t, the building return water temperature setting value t of the nearest time issued by central computer control unit before the building of a collection return water temperature T and communication failure carries out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, control the aperture of electric control valve:
(3.1.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(3.1.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(3.1.3). when deviate=0, the aperture of electric control valve is remained stationary state;
(3.2) when not receiving building return water temperature setting value t, by the local building return water temperature initial set value t that the building return water temperature T gathered and detection and control terminal store 0carry out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, control the aperture of electric control valve:
(3.2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(3.2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(3.2.3). when deviate=0, the aperture of electric control valve is remained stationary state;
Vertical hydraulic misadjustment in C, manually adjustment building:
Manually set the differential pressure value of the user's self-power differential pressure control valve on user return pipe, realize the adjustment of vertical hydraulic misadjustment in building.
The invention has the beneficial effects as follows: carry out on the basis of preliminary adjustment at a manually building self-power differential pressure control valve to horizontal hydraulic imbalance, by the return water temperature adopting a building return water temperature sensor to measure building at any time, the aperture of control system to electric control valve taking again the dual structure of local detection and control terminal closed-loop control and central computer control unit remote real_time control regulates, and reaches reliable accommodation timely; Here, because the characteristic of its frame for movement of self-power differential pressure control valve determines, after differential pressure value setting, adaptive adjustment can not be carried out to setting value according to the change of actual operating mode, therefore really can not meet the demand of horizontal hydraulic imbalance adjustment, but due to it, there is reliable operation, stable performance, adopt on the basis that self-power differential pressure control valve completes main body adjustment, coordinate electric control valve to carry out adaptability and automatically adjust, can obtain evenly horizontal hydraulic counterbalance effect.In the present invention, user's manual self-power differential pressure control valve is also adopted to achieve the adjustment of the vertical hydraulic misadjustment of secondary network.In addition, in the present invention, adopt self-power differential pressure control valve to replace traditional Self-operated flow limiting valve, both can realize horizontal hydraulic imbalance and the adjustment of vertical hydraulic misadjustment, the popularization needs that heating system takes thermal neasuring can be met again.Heating system secondary network hydraulic equilibrium performance is improve by the enforcement of control system provided by the invention and method thereof, prevent the wasting of resources, improve for thermal uniformity, energy saving, thus improve reliability, the comfortableness of user's heat, improve the economy of system simultaneously.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of central heating network secondary network hydraulic equilibrium control system;
Fig. 2 is the flow chart of the automatic adaptation adjustment horizontal hydraulic imbalance method of central heating network secondary network hydraulic equilibrium control system.
In figure: 1 central computer control unit, 2 detection and control terminals, 20 user's feed pipes, 30 user's return pipes, 3, GPRS communicator, 4 ball valves, 5 electric control valves, 6 dirt separators, 7 buildings self-power differential pressure control valves, 71,72 buildings self-power differential pressure control valve pressure guiding pipes, 8 return water temperature sensors, 80th floors feed pipes, 90 buildings return pipes, 9 user's self-power differential pressure control valves, 91,92 user's self-power differential pressure control valve pressure guiding pipes, A1-An building, B1-Bm user, C1-Cn horizontal hydraulic Offset control unit.
Below in conjunction with drawings and Examples to the detailed description of the invention.
Detailed description of the invention
Fig. 1 illustrates the central heating network secondary network hydraulic misadjustment control system of certain heat supply residential block, and in the present embodiment, the n in figure is 9, m is 15.Namely there are 9 building A1-A9 this heat supply residential block, have 15 user B1-B15, and a corresponding building A1-A9 has 9 horizontal hydraulic Offset control unit C1-C9 in each building.
Based on above-mentioned for thermal region, the feature of this central heating network secondary network hydraulic equilibrium control system is the 9 Ge Yuge buildings corresponding horizontal hydraulic Offset control unit C1-C9 arranged comprising distant central computer control unit 1 and control, above-mentioned horizontal hydraulic Offset control unit C1-C9 comprises the GPRS communicator 2 being arranged on a building entrance be connected with above-mentioned distant central computer control unit 1 respectively, local detection and control terminal 3, the electric control valve 5 be arranged on a building entrance building feed pipe 80 be connected with above-mentioned detection and control terminal 3, be separately positioned on the return water temperature sensor 8 on a building entrance building return pipe 90 and a building self-power differential pressure control valve 7, two pressure guiding pipes 71 of an above-mentioned building self-power differential pressure control valve, on the 72 water outlet side building return pipe 90 being connected to this valve and an electric control valve influent side building feed pipe 80, and in building each user entry user's return pipe 30 on the user's self-power differential pressure control valve 9 controlling vertical hydraulic misadjustment is set, two pressure guiding pipes 91,92 of above-mentioned user's self-power differential pressure control valve are connected on user's feed pipe 20 of this valve water outlet side user return pipe 30 and user entry.
As shown in Figure 1, a building feed pipe 80 and user's feed pipe 20 and a building return pipe 90 and user's return pipe 30 are respectively equipped with the ball valve 4 of control piper open and close, a building feed pipe 80 and user's feed pipe 20 are also being provided with the dirt separator 6 impurity in pipeline being carried out to scrubbing purification, the standard configuration equipment that these facilities are a building device and register one's residence in heating power cell.
The model that a building self-power differential pressure control valve 7 have employed Honeywell company is the self-power differential pressure control valve of Kombi-3-plus, and (1) its function is. the imbalance of secondary network horizontal hydraulic is tentatively adjusted.(2). the differential pressure value in restriction electric control valve loop, ensures the normal work of electric control valve 5.The operation principle of self-power differential pressure control valve is after hot aqueous medium is dammed by spool, valve seat, enter electric control valve loop, and the pressure reduction of electric control valve introduces the room of film up and down of self-power differential pressure control valve respectively by pressure guiding pipe 71,72, in the indoor generation motive force of upper and lower film, balance each other with the reaction force of its spring, thus determine the relative position of spool and valve seat, and the relative position of spool and valve seat determines the size of pressure difference; When controlled pressure reduction change, the balance of power is destroyed, thus driven valve core movement, change the resistance coefficient of valve, reach and ensure that controlling pressure reduction is the effect of setting value, thus the differential pressure value in restriction electric control valve loop, really make operting differential pressure be no more than maximum permissible pressure, ensure the normal work of electric control valve.
The model that above-mentioned user's self-power differential pressure control valve 9 also uses Honeywell company is the self-power differential pressure control valve of Kombi-3-plus, and its function eliminates the vertical hydraulic misadjustment of secondary network.
Electric control valve 5 adopts the VF2+AME55 electric control valve of Danfoss Industries Co., Ltd., and its function carries out off-leveling adaptability to secondary network hydraulic misadjustment automatically to adjust, and its aperture data reach detection and control terminal 4 by wired forms.
The central computer control unit 1 being arranged on heating network administrative center is active computer hardware system, the calculation procedure of a host memory Chu Ge building return water temperature setting value t, and this setting value is the functional value relevant to outdoor temperature; The function of central computer control unit 1 is the aperture by providing a building return water temperature setting value t to control electric control valve 5 to each building detection and control terminal 2, and then controls the imbalance of adjustment secondary network horizontal hydraulic and to be up to the standard hydraulic equilibrium; GPRS communicator 3 simultaneously by being separately positioned on 9 buildings receives this building return water temperature data of uploading from each building detection and control terminal 2 and electric control valve open degree feedback data are monitored.
Above-mentioned detection and control terminal 2 have employed the GT50 detection and control terminal of Tianjin Development Co., Ltd of blue Shenzhen Science and Technology, this detection and control terminal is the industrial computer directly applying to industry spot, be the integration apparatus comprising various template, in machine, store secondary network hydraulic misadjustment control program, a local building return water temperature initial set value t 0, accept the building return water temperature setting value t that central computer control unit passes for 1 time, and calculate the deviate △ T of a building return water temperature numerical value T and the Lou Dong return water temperature setting value t gathered, and then calculate deviate △ T be converted into controlled quentity controlled variable control electric control valve 5 carry out aperture adjustment, realize local closed-loop control; Under telecommunication normal condition, the building return water temperature setting value t taking central computer control unit to issue carries out closed-loop control; When telecommunication is out of order, adopt a building return water temperature setting value t or a local building return water temperature initial set value t of the nearest time that central computer control unit issues before communication failure 0carry out local closed-loop control.
The function of GPRS communicator is the communication apparatus of the two-way data communication realizing detection and control terminal and central computer control unit, adopt the communication modes of the conventional APN VPN used at present, in this example, select the GPRS communicator of Tianjin Development Co., Ltd of blue Shenzhen Science and Technology.
Method below for adopting above-mentioned central heating network secondary network hydraulic equilibrium control system to carry out hydraulic equilibrium control, is characterized in that comprising the steps:
A, manually preliminary adjustment horizontal hydraulic imbalance:
Manually set the differential pressure value of the building self-power differential pressure control valve 7 on a building return pipe 90, realize the preliminary adjustment of horizontal hydraulic imbalance;
B, adaptation adjustment horizontal hydraulic imbalance automatically, see Fig. 2:
(1). central computer control unit 1 calculates a building return water temperature setting value t according to outdoor temperature, and judges whether communication system has fault:
(1.1). when communication system is normal, then start Long-distance Control, detection and control terminal 2 receives a building return water temperature setting value t of central computer control unit 1, and enters step (2);
(1.2). when communication system has fault, then start local control, enter step (3);
(2). detection and control terminal 2 gathers the aperture data of a building return water temperature T and electric control valve 5 by temperature sensor 8 and is uploaded to central computer control unit 1; And a building return water temperature setting value t for the central computer control unit 1 of the building of a collection return water temperature T and reception is carried out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, control the aperture of electric control valve 5:
(2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve 5 down;
(2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve 5;
(2.3). as deviate △ T=0, the aperture of electric control valve 5 is remained stationary state;
(3). detection and control terminal 2 gathers the aperture data of a building return water temperature T and electric control valve 5; And judge whether to receive a building return water temperature setting value t:
(3.1) when detection and control terminal 2 received building return water temperature setting value t, the building return water temperature setting value t of the nearest time issued by central computer control unit 1 before the building of a collection return water temperature T and communication failure carries out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, control the aperture of electric control valve 5:
(3.1.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve 5 down;
(3.1.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve 5;
(3.1.3). when deviate=0, the aperture of electric control valve 5 is remained stationary state;
(3.2) when detection and control terminal 2 did not receive building return water temperature setting value t, by the local building return water temperature initial set value t that the building return water temperature T gathered and detection and control terminal store 0carry out deviate calculating, here return water temperature initial set value t 0different climate situation according to different regions sets, and calculates deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20ma, controls the aperture of electric control valve 5:
(3.2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve 5 down;
(3.2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve 5;
(3.2.3). when deviate=0, the aperture of electric control valve 5 is remained stationary state;
Vertical hydraulic misadjustment in C, manually adjustment building:
Manually set the differential pressure value of the user's self-power differential pressure control valve 9 on user return pipe 30, realize the adjustment of vertical hydraulic misadjustment in building.
In sum, in the present invention, by adopting a building self-power differential pressure control valve, the preliminary adjustment of manual horizontal hydraulic imbalance is carried out to secondary network, the automatic adaptation adjustment of horizontal hydraulic imbalance is carried out with electric control valve, combine the adjustment adopting user's manual self-power differential pressure control valve to carry out the vertical hydraulic misadjustment of secondary network simultaneously, achieve the hydraulically balanced structure adjusting of secondary network, obtain evenly hydraulic equilibrium effect.
Especially, the return water temperature being measured building in horizontal hydraulic imbalance self-regulating process by a building return water temperature sensor is at any time carried out at electric control valve, and have employed the dual structure combined by central computer control unit remote real_time control and local detection and control terminal closed-loop control, achieve reliable, timely, the accommodation of secondary network horizontal hydraulic balance.The building return water temperature setting value t calculated higher than central computer control unit as the building return water temperature T detected an or local building return water temperature initial set value t 0time, illustrate that the confession heat flow in this building is comparatively large, now turn the aperture of electric control valve 5 down, until an an a building return water temperature T and building return water temperature setting value t or local building return water temperature initial set value t 0valve opening is maintained after consistent; When the building return water temperature T detected is lower than an a building return water temperature setting value t or local building return water temperature initial set value t 0time, illustrate that the confession heat flow in this building is less, now tune up the aperture of electric control valve 5, until an an a building return water temperature T and building return water temperature setting value t or local building return water temperature initial set value t 0valve opening is maintained after consistent; As the building return water temperature T detected an an and building return water temperature setting value t or local building return water temperature initial set value t 0time consistent, illustrate that the confession heat flow in this building is normal, therefore electric control valve maintenance aperture is constant.
Heating system secondary network hydraulic equilibrium performance is improve by the enforcement of control system provided by the invention and method thereof, prevent the wasting of resources, improve for thermal uniformity, energy saving, thus improve reliability, the comfortableness of user's heat, improve the economy of system simultaneously.

Claims (1)

1. a central heating network secondary network hydraulic equilibrium control method, the hydraulic equilibrium control system of described method application comprises some and each building corresponding horizontal hydraulic Offset control unit arranged of distant central computer control unit and control thereof, described horizontal hydraulic Offset control unit comprises the GPRS communicator being arranged on a building entrance be connected with described distant central computer control unit, local detection and control terminal, the electric control valve be arranged on a building entrance building feed pipe be connected with described detection and control terminal, be separately positioned on the return water temperature sensor on a building entrance building return pipe and a building self-power differential pressure control valve, on the water outlet side building return pipe that two pressure guiding pipes of a described building self-power differential pressure control valve are connected to this valve and an electric control valve influent side building feed pipe, and in building, each user entry user return pipe arranging the user's self-power differential pressure control valve controlling vertical hydraulic misadjustment, two pressure guiding pipes of described user's self-power differential pressure control valve are connected on user's feed pipe of this valve water outlet side user's return pipe and user entry, it is characterized in that described method comprises the steps:
A, manually preliminary adjustment horizontal hydraulic imbalance:
Manually set the differential pressure value of the building self-power differential pressure control valve on a building return pipe, realize the preliminary adjustment of horizontal hydraulic imbalance;
B, adaptation adjustment horizontal hydraulic imbalance automatically:
(1). central computer control unit calculates a building return water temperature setting value t according to outdoor temperature, and judges whether communication system has fault:
(1.1). when communication system is normal, then start Long-distance Control, detection and control terminal receives a building return water temperature setting value t of central computer control unit, and enters step (2);
(1.2). when communication system has fault, then start local control, enter step (3);
(2). detection and control terminal gathers the aperture data of a building return water temperature T and electric control valve and is uploaded to central computer control unit; And a building return water temperature setting value t for the central computer control unit of the building of a collection return water temperature T and reception is carried out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20mA, control the aperture of electric control valve:
(2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(2.3). as deviate △ T=0, the aperture of electric control valve is remained stationary state;
(3). detection and control terminal gathers the aperture data of a building return water temperature T and electric control valve; And judge whether to receive a building return water temperature setting value t:
(3.1) when receiving building return water temperature setting value t, the building return water temperature setting value t of the nearest time issued by central computer control unit before the building of a collection return water temperature T and communication failure carries out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20mA, control the aperture of electric control valve:
(3.1.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(3.1.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(3.1.3). when deviate=0, the aperture of electric control valve is remained stationary state;
(3.2) when not receiving building return water temperature setting value t, the local building return water temperature initial set value t0 building of a collection return water temperature T and detection and control terminal stored carries out deviate calculating, obtain deviate △ T=T-t, and deviate △ T is converted to the analog control signal of 4-20mA, control the aperture of electric control valve:
(3.2.1). as deviate △ T ﹥ 0, turn the aperture of electric control valve down;
(3.2.2). as deviate △ T ﹤ 0, tune up the aperture of electric control valve;
(3.2.3). when deviate=0, the aperture of electric control valve is remained stationary state;
Vertical hydraulic misadjustment in C, manually adjustment building:
Manually set the differential pressure value of the user's self-power differential pressure control valve on user return pipe, realize the adjustment of vertical hydraulic misadjustment in building.
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