Pipe-in-pipe balance valve element, balance valve and pipe-in-pipe circulation system

Abstract

The utility model belongs to the technical field of domestic water, and particularly relates to a pipe-in-pipe balance valve core, a balance valve and a pipe-in-pipe circulation system. The pipe-in-pipe circulation system comprises a plurality of branches, each branch is provided with a balance valve element, and the pipe-in-pipe circulation system comprises a balance valve frame with a valve element mounting hole; the balance valve element rod is movably arranged on the valve element installation hole, and the reset piece is installed between the balance valve frame and the balance valve element rod. A balance channel is formed in the balance valve element rod, the size of an actual overflowing section formed by the balance channel and the balance valve frame can be changed along with the change of the axial position of the balance channel, and when the medium pressure of the first channel is larger, the area of the actual overflowing section is smaller. The backflow flow of the branch away from the circulating pump is larger than or equal to the backflow flow of the branch close to the circulating pump, the effect that the backflow flow is small and large is achieved, the circulation efficiency and water quality of the branch at the far end are guaranteed, and therefore the overall circulation efficiency and water quality of the pipe-in-pipe circulation system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of domestic water, especially balance valve core for pipe in pipe, balance valve and pipe in pipe circulating system. BACKGROUND

[0002] The utility model discloses a kind of pipe in pipe with running water circulating system with publication No.CN212956776U, including pipe in pipe pipeline by pipe in pipe and pipe joint, inner runner and outer runner are arranged in pipe in pipe pipeline, first inner tube installation end for communicating inner runner and first outer tube installation end for communicating outer runner are arranged on pipe in pipe pipeline, circulation pipeline is arranged between first outer tube installation end and first inner tube installation end, and circulation pipeline includes circulation pipe and circulating pump;The tail valve is connected to liquid outlet equipment at the end of pipe in pipe pipeline, and inner cavity of tail valve is communicated with inner runner and outer runner.The utility model can promote liquid to circulate between inner runner and outer runner regularly by the action of circulating pump, inhibit the breeding of bacteria and other harmful substances, and ensure that water source is clean and sanitary.

[0003] Generally, active water circulating system needs to be circulated at least every six hours, so as to maintain the quality of internal water quality, prevent dead water from breeding bacteria.But in actual use process, if meet the condition that pipe in pipe pipeline is relatively long, the branch closer to circulating pump is relatively large in pressure, circulation flow is relatively large, and circulation effect is relatively good;The branch far away from circulating pump is relatively small in pressure, circulation flow is relatively small, and circulation effect is poor, and even the end of the farthest branch does not participate in circulation. SUMMARY

[0004] The utility model aims at providing a kind of pipe in pipe with balance valve core, balance valve and pipe in pipe circulating system with simple structure, which can improve overall circulation effect.

[0005] The utility model is realized as follows:

[0006] A kind of pipe in pipe with balance valve core, for installing in the branch end of pipe in pipe pipeline with first channel and second channel, comprising: balance valve frame, install in branch end and for separating first channel and second channel, and with valve core mounting hole;Balance valve core rod, movably set on valve core mounting hole, and reset piece, install between balance valve frame and balance valve core rod, for driving balance valve core rod reset;Wherein, balance valve core rod is set with the balance channel for the first channel and the second channel of being guided, the actual flow cross section size formed by this balance channel and balance valve frame will change with the axial position of itself, when the medium pressure of first channel is greater, the area of actual flow cross section is smaller.

[0007] The utility model further sets up, the balance valve core rod has the reset piece installation part of abutting reset piece and the valve rod part that has set up the balance passage.

[0008] The utility model further sets up, the balance valve core rod still has the sealing installation part, this sealing installation part is provided with sealing part, can seal the valve core installation hole under the action of reset piece, realizes one -way conduction.

[0009] The utility model further sets up, the balance passage includes at least one balance groove that sets up on the lateral wall of valve rod part along the axial direction, the minimum radial section that balance groove forms with the inner wall of valve core installation hole is actual flow section;Wherein, balance groove has balance groove liquid inlet section and balance groove liquid outlet section, the radial section size of balance groove liquid inlet section gradually becomes smaller or stepwisely becomes smaller along the axial direction away from balance groove liquid outlet section.

[0010] The utility model further sets up, the groove depth or / and groove width of balance groove liquid inlet section gradually becomes smaller or stepwisely becomes smaller along the axial direction away from balance groove liquid outlet section.

[0011] The utility model further sets up, the axial length of balance groove liquid outlet section is greater than or equal to the axial length where valve core installation hole is located, and the radial section of balance groove liquid outlet section is always greater than or equal to the maximum radial section of balance groove liquid inlet section.

[0012] The utility model further sets up, the balance passage includes at least one balance liquid inlet hole that sets up in the lateral wall of valve rod part, sets up in the liquid inlet inner chamber of valve rod part and sets up at least one balance liquid outlet hole in the end of valve rod part, and the balance liquid inlet hole part not being covered by the lateral wall of valve core installation hole is actual flow section.

[0013] The utility model further sets up, the balance valve frame has: inner installation part, installs on the inner pipe of pipe-in-pipe pipeline, and sets up valve core installation hole;Outer installation part, directly or indirectly installs on the outer pipe of pipe-in-pipe pipeline;And connecting part, for connecting inner installation part and outer installation part.

[0014] A pipe-in-pipe balance valve, including valve body and the balance valve core that sets up in valve body, balance valve core is the pipe-in-pipe balance valve core described above, and balance valve core is integrally or separately set up on valve body through balance valve frame.

[0015] A kind of pipe-in-pipe circulating system, including pipe-in-pipe pipeline and functional module, pipe-in-pipe pipeline has main pipeline and several branches arranged on main pipeline, both have first channel and second channel, and branch end is provided with balance valve core or balance valve;Functional module includes circulating pump and the functional component of treating medium, the liquid outlet end of circulating pump is communicated with the first channel of main pipeline, the liquid inlet end of circulating pump is communicated with the second channel of main pipeline, to form circulating loop;Balance valve core is the balance valve core for the above-mentioned pipe-in-pipe, balance valve is the above-mentioned balance valve for pipe-in-pipe;When first channel pressurization circulation, the backflow of branch far from circulating pump can be greater than or equal to the backflow of branch close to circulating pump.

[0016] The utility model discloses compared with prior art prominent and beneficial technical effect is:

[0017] 1、The balance valve core of the utility model includes balance valve frame, balance valve core stem and reset piece, the balance valve core stem is opened and has balance channel for the conduction first channel and second channel, the actual flow cross section size formed by this balance channel and balance valve frame will change with the axial position change of itself, when the medium pressure of first channel is greater, the area of actual flow cross section is smaller, to realize the regulation of backflow between first channel and second channel.

[0018] 2、The balance valve core stem of the utility model still has sealing installation part, and the sealing installation part is provided with sealing part, is used for the sealing of balance valve core, prevents the medium (water) backflow in second channel (inner flow channel), realizes one-way conduction.When water pressure is smaller, can seal second channel (inner flow channel), and balance valve core can serve as check valve core, is favorable to guarantee the water pressure of water outlet end;When water pressure is larger, open second channel (inner flow channel), and balance valve core can serve as pressure relief valve core.

[0019] 3、The balance valve core of each branch end of the utility model is installed, when pipe-in-pipe circulating system carries out internal circulation, the balance valve core of branch close to circulating pump because pressure is relatively big, balance valve core stem axial movement distance is relatively big, actual flow cross section is relatively small, and backflow is relatively small;The balance valve core of branch far from circulating pump because pressure is relatively small, balance valve core stem axial movement distance is relatively small at this place, actual flow cross section is relatively big, and backflow is relatively big.Therefore, the backflow of branch far from circulating pump is greater than or equal to the backflow of branch close to circulating pump, realizes the effect that backflow is close small and far big, guarantees the circulation efficiency and water quality of remote branch, to improve the circulation efficiency and water quality of pipe-in-pipe circulating system as a whole. ACCURACY OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model pipe-in-pipe circulating system.

[0021] Figure 2 is the state diagram of the balance valve core when the branch end of the utility model far away from the circulating pump backflows.

[0022] Figure 3 is the structure diagram of the first balance valve core of the utility model.

[0023] Figure 4 is Figure 2 the sectional view at A-A.

[0024] Figure 5 is the state diagram of the balance valve core when the branch end of the utility model close to the circulating pump backflows.

[0025] Figure 6 is the installation structure diagram of the second balance valve core of the utility model.

[0026] Figure 7 is the installation structure diagram of the third balance valve core of the utility model.

[0027] Figure 8 is the installation structure diagram of the fourth balance valve core of the utility model.

[0028] Figure 9 is the installation structure diagram of the first balance valve of the utility model.

[0029] Figure 10 is the installation structure diagram of the second balance valve of the utility model.

[0030] Figure 11 is the installation structure diagram of the third balance valve of the utility model.

[0031] Meaning represented by the reference signs in the drawing:

[0032] Pipe-in-pipe pipeline 1, function module 2, balance valve core 3, balance valve 4, control valve 5,

[0033] Main pipeline 11, branch 12, pipe-in-pipe 13, pipe joint 14, inner tube 141, outer tube 142,

[0034] Circulating pump 21, function part 22, water inlet check valve 23, backflow check valve 24, water inlet pipe 25, backflow pipe 26,

[0035] Balancing valve frame 31, valve core mounting hole 311, inner mounting portion 312, annular convex portion 3121, outer mounting portion 313, connecting portion 314, balancing valve core rod 32, reset member mounting portion 321, valve rod portion 322, balancing inlet hole 3221, inlet inner cavity 3222, balancing outlet hole 3223, sealing mounting portion 323, balancing groove 324, balancing groove inlet section 3241, balancing groove outlet section 3242, insertion portion 325, sealing cover 326, reset member 33, sealing member 34, sealing ring 35,

[0036] Valve body 41, adapter 42,

[0037] Actual flow cross section 100. DETAILED DESCRIPTION

[0038] The utility model will be described further below in combination with specific embodiments:

[0039] Embodiment one:

[0040] As Figure 1 shown, a pipe-in-pipe circulating system, in particular a direct drinking water circulating system, is mainly used in scenes such as residential buildings, villas and hotels that need to provide direct drinking water, and comprises a pipe-in-pipe pipeline 1 and a functional module 2.

[0041] Among them, the pipe-in-pipe pipeline 1 has a main pipeline 11 and a plurality of branch pipelines 12 arranged on the main pipeline 11, both of which are composed of a pipe-in-pipe 13 with a first channel and a second channel and a pipe joint 14. Generally speaking, the pipe-in-pipe 13 and the pipe joint 14 both include an inner pipe 141, an outer pipe 142 and a connecting portion connecting the two, the inner pipe 141 forms an inner flow passage, and the outer flow passage is formed between the inner pipe 141 and the outer pipe 142. In this embodiment, the first flow passage is the outer flow passage, and the second flow passage is the inner flow passage. In other embodiments, the first flow passage can also be the inner flow passage, and the second flow passage is the outer flow passage.

[0042] In this embodiment, the functional module 2 comprises a circulating pump 21, a functional component 22 for treating medium, a water inlet check valve 23, a water inlet pipe 25, a backflow check valve 24 and a backflow pipe 26, the water inlet pipe 25 is sequentially communicated with the circulating pump 21 and the functional component 22 through the water inlet check valve 23, the functional component 22 is preferably a water filter or a sterilizer, the liquid outlet end of the circulating pump 21 is communicated with the first channel of the main pipeline 11 through the functional component 22, and the liquid inlet end of the circulating pump 21 is also communicated with the second channel of the main pipeline 11 through the backflow check valve 24 and the backflow pipe 26. At this time, a circulating loop is formed among the circulating pump 21, the functional component 22, the first channel and the second channel, when the circulating pump 21 is opened, the direct drinking water inside the pipeline can continuously circulate through the functional component 22, so as to ensure the water quality of the direct drinking water.

[0043] The order of the positions of the circulating pump 21 and the functional components 22 can be set according to actual needs.

[0044] In this embodiment, each branch 12 is equipped with a balancing valve core 3 or a balancing valve 4 containing the balancing valve core 3 at its end. This embodiment takes the balancing valve core 3 as an example. Specifically, the branch 12 is equipped with a pipe connector 14, a balancing valve core 3, and a control valve 5. The balancing valve core 3 is used to control the backflow of the first and second channels. The control valve 5 is generally an angle valve, used to connect to water outlet devices such as faucets for user use.

[0045] like Figure 2 As shown, the balance valve core 3 includes a balance valve frame 31, a balance valve core rod 32 with a balance channel, a reset component 33, a sealing component 34, and a sealing ring 35.

[0046] In this embodiment, the balance valve core 3 is mainly used to realize the return flow from the first channel (outer flow channel) to the second channel (inner flow channel).

[0047] like Figure 3 , 4 As shown, the balance valve frame 31 has an integrally formed inner mounting part 312, an outer mounting part 313, and several connecting parts 314 for connecting the inner mounting part 312 and the outer mounting part 313. The inner mounting part 312 has a tubular structure, with an annular protrusion 3121 protruding from its inner wall. A valve core mounting hole 311 is formed in the annular protrusion 3121. The inner tube 141 of the pipe connector 14 is provided with a mounting step at its end. The inner end of the inner mounting part 312 is mounted on the mounting step. A sealing ring 35 is provided between the mounting step and the annular protrusion 3121, thereby achieving sealing and positioning between the balance valve frame 31 and the inner tube 141. The outer mounting part 313 is provided with a connecting structure such as an external thread on its outer side, which can be directly or indirectly mounted on the outer tube of the pipe connector 14. The outer mounting part 31 is integrally fixedly connected to the inner mounting part 312 via the connecting part 314. The connecting part 314 is used to connect the inner mounting part 312 and the outer mounting part 313 on the one hand, and can also conduct the outer flow channel on the other hand. At this time, with the valve core mounting hole 311 as the dividing point, the balance valve frame 31 can separate the first channel (outer flow channel) and the second channel (inner flow channel).

[0048] The balance valve core rod 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 that abuts against the reset member 33, a valve stem part 322, and a sealing mounting part 323.

[0049] The outer diameter of the valve stem portion 322 and the seal mounting portion 323 is matched with the inner diameter of the valve core mounting hole 311, the seal mounting portion 323 is provided with a seal mounting groove, a seal member 34 is arranged in the seal mounting groove, the seal member 34 is preferably an O-ring, and the outer diameter of the seal member 34 is greater than the valve core mounting hole 311. The outer diameter of the reset member mounting portion 321 is greater than the valve core mounting hole 311, so that the balance valve core stem 32 can be movably limited in the valve core mounting hole 311. The reset member mounting portion 321 is in a stepped ring shape, and a reset member mounting groove is formed in the annular convex portion 3121. The reset member is preferably a spring, which is mounted between the reset member mounting portion 321 and the reset member mounting groove, and is used to drive the balance valve core stem 32 to reset, so that the seal member 34 can seal the valve core mounting hole 311 and realize the sealing of the balance valve core 3, prevent the medium (water) in the second channel (inner flow channel) from flowing back, and realize one-way conduction. When the water pressure is small, the second channel (inner flow channel) can be sealed, and the balance valve core 3 can be used as a check valve core, which is beneficial to ensure the water outlet pressure of the water outlet end; when the water pressure is large, the second channel (inner flow channel) is opened, and the balance valve core 3 can be used as a pressure relief valve core.

[0050] The reset member mounting portion 321, the valve stem portion 322 and the seal mounting portion 323 of the embodiment are integrally formed in sequence, and in some embodiments, the three can also be separately provided.

[0051] Generally, the main factors affecting the backflow are flow rate and radial cross-sectional area. In the embodiment, the backflow between the first channel (outer flow channel) and the second channel (inner flow channel) is mainly adjusted by changing the radial cross-sectional size of the balance channel.

[0052] In the embodiment, the valve stem portion 322 is provided with a balance channel for conducting the first channel and the second channel, and the actual flow cross-sectional size of the balance channel formed by the balance valve frame 31 changes with the axial position of the balance channel. When the medium pressure of the first channel is greater, the actual flow cross-sectional area of the balance channel is smaller.

[0053] Specifically, the balance channel includes at least one balance groove 324 axially formed on the side wall of the valve stem portion 322, the balance groove 324 has a balance groove inlet section 3241 and a balance groove outlet section 3242, and the radial cross-sectional size of the balance groove inlet section 3241 gradually decreases or decreases in steps along the axial direction away from the balance groove outlet section 3242.

[0054] Since the inner wall of the valve core mounting hole 311 (i.e. the annular convex portion 3121) has a certain length, when the balance groove 324 is only one, the smallest radial cross-section formed by the balance groove 324 and the inner wall of the valve core mounting hole 311 is the actual flow cross-section; when the balance groove 324 is multiple, the sum of the smallest radial cross-sections formed by each balance groove 324 and the inner wall of the valve core mounting hole 311 is the actual flow cross-section.

[0055] Taking a balancing tank 324 in this embodiment as an example, the depth and / or width of the liquid inlet section 3241 of the balancing tank gradually decreases or decreases in a stepwise manner along the axis away from the liquid outlet section 3242 of the balancing tank. Figure 3 As shown, the depth of the liquid inlet section 3241 of the balance tank gradually decreases towards the axial direction of the reset component mounting part 321, that is, the bottom of the liquid inlet section 3241 of the balance tank is an inclined plane.

[0056] like Figure 2 As shown, since the liquid outlet section 3242 of the balance tank is located close to the second channel (inner flow channel), the balance valve core 3 is in a sealed state when the first channel (outer flow channel) is not pressurized. When the pressure of the first channel (outer flow channel) increases and exceeds the initial reset force of the reset component, it can push the balance valve core rod 32 to move axially, thereby opening the balance channel. The greater the pressure of the first channel (outer flow channel), the greater the axial distance of the balance valve core rod 32 moving downward, the smaller the radial cross section of the balance tank inlet section 3241 corresponding to the inner wall of the valve core mounting hole 311, and the smaller the return flow rate from the first channel (outer flow channel) to the second channel (inner flow channel).

[0057] Preferably, the axial length of the outlet section 3242 of the balance tank is greater than or equal to the axial length of the valve core mounting hole 311, and the radial cross-section of the outlet section 3242 of the balance tank is always greater than or equal to the maximum radial cross-section of the inlet section 3241 of the balance tank. In the initial state of the balance valve core 3 being open, there can be the largest radial cross-section backflow. At this time, the inlet section 3241 of the balance tank has not yet entered the valve core mounting hole 311, and the backflow rate from the first channel (outer flow channel) to the second channel (inner flow channel) is the largest.

[0058] Preferably, the balancing groove 324 is straight, inclined or spiral. In this embodiment, the balancing groove 324 is preferably straight with axial orientation, and the groove width is consistent. The groove depth of the liquid inlet section 3241 of the balancing groove gradually decreases, which is convenient for processing.

[0059] like Figure 1 As shown, each branch of the pipe-in-pipe circulation system is equipped with a balance valve core 3. When the pipe-in-pipe circulation system is in internal circulation, as... Figure 5 As shown, the balance valve core 3 in the branch near the circulating pump experiences higher pressure, resulting in a larger axial movement distance of the balance valve core rod 32, a smaller actual flow cross-section, and a smaller return flow rate. Figure 2As shown, the balance valve core 3 of the branch far away from the circulating pump has a small axial movement distance of the balance valve core rod 32, a large actual flow cross section, and a large backflow amount due to a small pressure difference. Therefore, in the embodiment, the backflow amount of the branch 12 far away from the circulating pump 21 is greater than or equal to the backflow amount of the branch 12 close to the circulating pump 21, achieving the effect of a small backflow amount close to the circulating pump and a large backflow amount far away from the circulating pump, ensuring the circulation efficiency and water quality of the distal branch, and thus improving the overall circulation efficiency and water quality of the pipe-in-pipe circulation system.

[0060] In addition, it should be noted that in the embodiment, the balance valve core 3 in the pipe joint 14 can also be understood as a balance valve 4 with a balance valve core 3, and the pipe joint 14 corresponds to a valve body 41.

[0061] In other embodiments, the pipe-in-pipe circulation system can also be used in a hot water outlet system, in which case the functional component 22 is a water heater.

[0062] In other embodiments, the balance valve core 3 can also be used to control the backflow amount of the second channel (inner flow channel) to the first channel (outer flow channel).

[0063] Embodiment Two:

[0064] The embodiment is basically the same as Embodiment One, except for the structure of the balance valve core 3.

[0065] As shown in Figure 6 The balance valve frame 31 has an integrally formed inner mounting portion 312, an outer mounting portion 313, and a plurality of connecting portions 314 for connecting the inner mounting portion 312 and the outer mounting portion 313. The inner mounting portion 312 has a tubular structure, and the inner wall of the end portion protrudes to form an annular protrusion 3121, and the annular protrusion 3121 has a valve core mounting hole 311 formed therein; the inner tube 141 of the pipe joint 14 has an installation step formed at the end portion, and the inner mounting portion 312 is mounted on the installation step. The outer mounting portion 313 has an outer thread or other connecting structure formed on the outer side, which can be directly or indirectly mounted on the outer tube of the pipe joint 14. The outer mounting portion 31 is integrally and fixedly connected with the inner mounting portion 312 through the connecting portions 314.

[0066] The balance valve core rod 32 is mounted in the valve core mounting hole 311, and has a reset member mounting portion 321 abutting against the reset member 33, a sealing mounting portion 323, a valve rod portion 322, and an insertion portion 325.

[0067] The outer diameter of the valve stem part 322 is adapted to the inner diameter of the valve core mounting hole 311, and the valve stem part 322 is provided with a balance groove 324 structure as in Embodiment One. One end of the valve stem part 322 is provided with an insertion part 325 composed of a plurality of elastic buckles, which can pass through the inner diameter of the valve core mounting hole 311 and be installed in position. The other end of the valve stem part 322 is sequentially provided with a sealing mounting part 323 and a reset member mounting part 321, and the outer diameter of the sealing mounting part 323 is greater than the inner diameter of the valve core mounting hole 311, for sleeving a sealing member 34, which is preferably an annular gasket, and the outer diameter of the sealing member 34 is greater than the valve core mounting hole 311, which can abut against the one end of the annular convex part 312 to achieve sealing.

[0068] The reset member is a conical spring, which is installed between the reset member mounting part 321 and the end of the inner tube 141 of the pipe joint 14, for driving the balance valve core stem 32 to reset, so that the sealing member 34 can seal the valve core mounting hole 311 and achieve sealing of the balance valve core 3. The reset member mounting part 321 has a plurality of limit pieces that can be deformed, and when the conical spring is installed on the reset member mounting part 321, the limit pieces are deformed outward, which can effectively fix the conical spring.

[0069] In this embodiment, the reset member mounting part 321, the sealing mounting part 323, the valve stem part 322 and the insertion part 325 are integrally formed.

[0070] Embodiment Three:

[0071] This embodiment is basically the same as Embodiment Two, and the difference lies in the structure of the balance valve core stem 32.

[0072] As shown in Figure 7 , the balance valve core stem 32 is installed in the valve core mounting hole 311, and has a reset member mounting part 321 abutting against the reset member 33, a sealing mounting part 323, a valve stem part 322 and a sealing cover 326.

[0073] The outer diameter of the valve stem part 322 is adapted to the inner diameter of the valve core mounting hole 311, and the other end of the valve stem part 322 is sequentially provided with a sealing mounting part 323 and a reset member mounting part 321, and the outer diameter of the sealing mounting part 323 is greater than the inner diameter of the valve core mounting hole 311, for sleeving a sealing member 34, which is preferably an annular gasket, and the outer diameter of the sealing member 34 is greater than the valve core mounting hole 311, which can abut against the one end of the annular convex part 312 to achieve sealing.

[0074] The reset member is a conical spring installed between the reset member mounting portion 321 and the inner tube 141 end of the pipe joint 14, used to drive the balance valve spool 32 to reset, so that the sealing member 34 can seal the valve spool mounting hole 311 and achieve the sealing of the balance valve spool 3. The reset member mounting portion 321 has a plurality of limit pieces that can be deformed, and when the conical spring is installed on the reset member mounting portion 321, the limit pieces are deformed outward, which can effectively fix the conical spring.

[0075] The balance passage includes at least one balance inlet hole 3221 provided on the side wall of the valve stem portion 322, an inlet lumen 3222 provided inside the valve stem portion 322, and at least one balance outlet hole 3223 provided at the end of the valve stem portion 322.

[0076] In this embodiment, the reset member mounting portion 321, the sealing mounting portion 323, and the valve stem portion 322 are integrally formed, the sealing cover 326 is fixed at the end of the valve stem portion 322, and the outer diameter of the sealing cover 326 is greater than the inner diameter of the valve spool mounting hole 311, due to the axial limitation of the balance valve spool 32.

[0077] The balance outlet hole 3223 is distributed near the sealing mounting portion 323, and the balance inlet hole 3221 is arranged in the axial direction, and the part of the balance inlet hole not covered by the inner wall of the valve spool mounting hole 311 is the actual flow cross section. At this time, the greater the pressure of the first passage (outer flow channel), the greater the axial distance of the balance valve spool 32 moving downward, the greater the area of the balance inlet hole covered by the inner wall of the valve spool mounting hole 311, and the smaller the actual inlet area of the balance inlet hole, so that the backflow of the first passage (outer flow channel) to the second passage (inner flow channel) is smaller.

[0078] The balance inlet hole 3221 is a strip-shaped hole, an inclined hole, or a spiral hole, and preferably the hole diameter gradually decreases or decreases in steps along the axial direction away from the balance outlet hole 3222.

[0079] Embodiment Four:

[0080] This embodiment is basically the same as Embodiment One, except for the structure of the balance valve spool 32.

[0081] As shown in Figure 8 The balance valve frame 31 of this embodiment is basically the same as that of Embodiment One.

[0082] The balance valve spool 32 is installed in the valve spool mounting hole 311, and has a reset member mounting portion 321 abutting against the reset member 33, a valve stem portion 322, and a sealing mounting portion 323.

[0083] The outer diameter of the valve stem part 322 and the sealing mounting part 323 is matched with the inner diameter of the valve core mounting hole 311, the sealing mounting part 323 is provided with a sealing mounting groove, a sealing part 34 is arranged in the sealing mounting groove, the sealing part 34 is preferably an O-ring, and the outer diameter of the sealing part 34 is greater than the valve core mounting hole 311, and the outer diameter of the reset part mounting part 321 is greater than the valve core mounting hole 311, so that the balance valve core stem 32 can be movably limited in the valve core mounting hole 311. The reset part mounting part 321 is in a stepped ring shape, and a reset part mounting groove is formed on the annular protrusion 3121, and a reset part, preferably a spring, is arranged between the reset part mounting part 321 and the reset part mounting groove, for driving the balance valve core stem 32 to reset, so that the sealing part 34 can seal the valve core mounting hole 311.

[0084] The reset part mounting part 321, the valve stem part 322 and the sealing mounting part 323 of the embodiment are integrally formed in sequence.

[0085] The balance passage includes at least one balance inlet hole 3221 arranged on the side wall of the valve stem part 322, an inlet cavity 3222 arranged in the valve stem part 322, and at least one balance outlet hole 3223 arranged on the end of the valve stem part 322.

[0086] The balance outlet holes 3223 are distributed near the sealing mounting part 323, the balance inlet holes 3221 are arranged in the axial direction, and the part of the balance inlet hole not covered by the inner wall of the valve core mounting hole 311 is the actual flow cross section. At this time, the greater the pressure of the first passage (outer flow channel), the greater the axial distance of the balance valve core stem 32 downward movement, the greater the area of the part of the balance inlet hole covered by the inner wall of the valve core mounting hole 311, and the smaller the actual inlet area, so that the backflow of the first passage (outer flow channel) to the second passage (inner flow channel) is smaller.

[0087] The balance inlet hole 3221 is a strip-shaped hole, an inclined hole or a spiral hole, and preferably the hole diameter gradually decreases or decreases in steps along the axial direction away from the balance outlet hole 3222.

[0088] In order to facilitate processing, a process hole is formed on the top of the balance valve core stem 32, and a sealing cover 326 is arranged on the process hole.

[0089] Embodiment five:

[0090] A balance valve for pipe-in-pipe includes a balance valve core 3 arranged in a valve body 41, the balance valve core 3 is the balance valve core mentioned in embodiments one to four, and the balance valve core is arranged on the valve body 41 integrally or separately through a balance valve frame 31.

[0091] Specifically, as Figure 9As shown, the valve body 41 has a valve body mounting end and a valve body outlet end. A water outlet control valve core and a handwheel are provided between the valve body mounting end and the valve body outlet end. A balance valve core is separately provided at the valve body mounting end. The balance valve core of this embodiment is basically the same as the balance valve core of embodiment one. The difference is that the inner mounting part 312, the connecting part 314, and the outer mounting part 313 of the balance valve frame 31 are all axially distributed to facilitate the internal thread connection between the balance valve core and the valve body mounting end. The external part of the valve body mounting end is connected to the outer pipe 142 of the pipe joint 14 through the adapter 42 or the external thread.

[0092] Example 6:

[0093] This embodiment is basically the same as embodiment five, except that:

[0094] like Figure 10 As shown, the balance valve core 3 is the balance valve core 3 of Embodiment 2, and the balance valve frame 31 is integrally formed on the valve body mounting end of the valve body 41. The valve body mounting end is threadedly connected to the outer tube 142 of the pipe joint 14 through the external thread.

[0095] Example 7:

[0096] This embodiment is basically the same as embodiment five, except that:

[0097] like Figure 11 As shown, the balance valve core 3 is the balance valve core 3 of Embodiment 4. The balance valve bracket 31 is threadedly installed on the inner wall of the valve body mounting end of the valve body 41. The valve body mounting end is threadedly connected to the outer pipe 142 of the pipe joint 14 through the external thread.

[0098] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A balanced valve core for a pipe-in-pipe, for installation at the end of a branch (12) of a pipe-in-pipe line (1) having a first channel and a second channel, characterized in that, The balance valve frame (31) is installed at the end of the branch (12) and is used to separate the first channel and the second channel, and has a valve core installation hole (311); the balance valve core rod (32) is movably arranged on the valve core installation hole (311); and the reset member (33) is installed between the balance valve frame (31) and the balance valve core rod (32) and is used to drive the balance valve core rod (32) to reset. The balance valve core rod (32) is provided with a balance channel for guiding the first channel and the second channel, and the actual flow cross section formed by the balance valve frame (31) changes with the axial position of the balance valve core rod (32). The greater the medium pressure of the first channel is, the smaller the actual flow cross section is. The balance valve core rod (32) has a reset member installation portion (321) abutting against the reset member (33) and a valve rod portion (322) provided with the balance channel. The balance valve core rod (32) further has a sealing installation portion (323) provided with a sealing member (34) capable of sealing the valve core installation hole (311) under the action of the reset member (33) and realizing one-way guidance. The balance channel includes at least one balance groove (324) axially arranged on the side wall of the valve rod portion (322), and the minimum radial cross section of the balance groove (324) and the inner wall of the valve core installation hole (311) is the actual flow cross section.

2. A balanced spool for a tube-in-tube valve according to claim 1, characterized in that: The balance groove (324) has a balance groove liquid inlet section (3241) and a balance groove liquid outlet section (3242), and the radial cross section of the balance groove liquid inlet section (3241) gradually or stepwisely decreases along the axial direction away from the balance groove liquid outlet section (3242).

3. A balanced spool for a tube-in-tube valve according to claim 2, wherein: The groove depth and / or groove width of the balance groove liquid inlet section (3241) gradually or stepwisely decrease along the axial direction away from the balance groove liquid outlet section (3242).

4. A balanced spool for a tube-in-tube valve according to claim 2 or 3, characterised in that: The axial length of the balance groove liquid outlet section (3242) is greater than or equal to the axial length of the valve core installation hole (311), and the radial cross section of the balance groove liquid outlet section (3242) is always greater than or equal to the maximum radial cross section of the balance groove liquid inlet section (3241). The balance channel includes at least one balance liquid inlet hole (3221) arranged on the side wall of the valve rod portion (322), a liquid inlet inner cavity (3222) arranged inside the valve rod portion (322), and at least one balance liquid outlet hole (3223) arranged at the end of the valve rod portion (322), and the balance liquid inlet hole not covered by the inner wall of the valve core installation hole (311) is the actual flow cross section.

5. A balanced spool for a tube-in-tube valve according to claim 4, wherein:

8. The balance valve core for a pipe-in-pipe according to any one of claims 1-3, wherein the balance valve frame (31) has: an inner installation portion (312) installed on the inner pipe of the pipe-in-pipe pipeline (1) and provided with the valve core installation hole (311); and an outer installation portion (313) directly or indirectly installed on the outer pipe of the pipe-in-pipe pipeline (1).

6. A balanced spool for a tube-in-tube valve according to claim 4, wherein: ​ 7. A balanced spool for a tube-in-tube valve according to claim 2 or 3, wherein: ​ ​ ​ ​ ​ ​ A connecting portion (314) is arranged between the inner mounting portion (312) and the outer mounting portion (313).

9. A counterbalance valve for pipe-in-pipe applications, characterized by: The valve body and the balance valve core (3) arranged in the valve body (41), the balance valve core (3) is the balance valve core for pipe-in-pipe as claimed in any one of claims 1-7, and the balance valve core is arranged on the valve body (41) integrally or separately through the balance valve frame (31).

10. A pipe-in-pipe circulation system characterized by, The pipe-in-pipe pipeline (1) and the functional module (2), The pipe-in-pipe pipeline (1) has a main pipeline (11) and several branch pipelines (12) arranged on the main pipeline (11), both of which have a first channel and a second channel, and the branch pipelines (12) are provided with balance valve cores (3) or balance valves (4) at the ends; The functional module (2) comprises a circulating pump (21) and a functional component (22) for treating medium, the liquid outlet of the circulating pump (21) is communicated with the first channel of the main pipeline (11), and the liquid inlet of the circulating pump (21) is communicated with the second channel of the main pipeline (11), thereby forming a circulating loop; The balance valve core (3) is the balance valve core for pipe-in-pipe as claimed in any one of claims 1-8, The balance valve (4) is the balance valve for pipe-in-pipe as claimed in claim 9; When the first channel is pressurized and circulated, the backflow of the branch pipeline (12) far away from the circulating pump (21) can be greater than or equal to the backflow of the branch pipeline (12) close to the circulating pump (21).

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