Diaphragm type balance valve element for pipe-in-pipe, balance valve and pipe-in-pipe circulation system

Abstract

The invention belongs to the technical field of domestic water, and particularly relates to a diaphragm type balance valve element for a pipe-in-pipe, 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 installed at the tail end of a pipe-in-pipe pipeline; the valve core seat is mounted on the balance valve frame; the diaphragm component is installed on the valve element seat or in the balance valve frame, and a balance channel is arranged between the valve element seat and the diaphragm component or between the balance valve frame and the diaphragm component; the diaphragm component can deform and change the sectional area of the balance channel according to the pressure of the first channel. The medium pressure is large, the deformation amount of the diaphragm component is large, and the backflow amount of the balance channel is small, so that the backflow amount of the branch away from the circulating pump is larger than or equal to the backflow amount of the branch close to the circulating pump, the effect that the backflow amount is small and large is achieved, and the circulating efficiency and the water quality of the branch at the far end are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of domestic water, and particularly relates to a diaphragm type balance valve core, a balance valve and a pipe-in-pipe circulation system for use in a pipe-in-pipe. Background Art

[0002] The utility model with the publication number CN212956776U discloses a pipe-in-pipe live water circulation system, which includes a pipe-in-pipe pipeline composed of a pipe-in-pipe and pipe joints. An inner flow channel and an outer flow channel are arranged in the pipe-in-pipe pipeline. A first inner pipe installation end communicating with the inner flow channel and a first outer pipe installation end communicating with the outer flow channel are arranged on the pipe-in-pipe pipeline. A circulation pipeline is arranged between the first outer pipe installation end and the first inner pipe installation end. The circulation pipeline includes a circulation pipe and a circulation pump. The end of the pipe-in-pipe pipeline is connected to a liquid outlet device through a tail valve, and the inner cavity of the tail valve communicates with the inner flow channel and the outer flow channel. Through the action of the circulation pump, this utility model can promote the liquid to circulate regularly between the inner flow channel and the outer flow channel, inhibit the growth of harmful substances such as bacteria, and ensure the cleanliness and hygiene of the water source.

[0003] Generally, a live water circulation system needs to circulate at least once every six hours to maintain the quality of the internal water quality and prevent the growth of stagnant water bacteria. However, in the actual use process, when the pipe-in-pipe pipeline is relatively long, for the branch closer to the circulation pump, the pressure is relatively large, the circulation flow rate is relatively large, and the circulation effect is relatively good; for the branch farther away from the circulation pump, the pressure is relatively small, the circulation flow rate is relatively small, resulting in a poor circulation effect, and even the situation where the end of the farthest branch does not participate in the circulation. Summary of the Invention

[0004] The purpose of the present invention is to provide a diaphragm type balance valve core, a balance valve and a pipe-in-pipe circulation system for use in a pipe-in-pipe, which have a simple structure and can improve the overall circulation effect.

[0005] The purpose of the present invention is achieved as follows:

[0006] A diaphragm type balance valve core for use in a pipe-in-pipe pipeline having a first channel and a second channel, includes: a balance valve frame installed at the end of the pipe-in-pipe pipeline and used for separating the first channel and the second channel; a valve core seat installed on the balance valve frame; and a diaphragm component installed on the valve core seat or inside the balance valve frame. A balance channel is arranged between the valve core seat and the diaphragm component or between the balance valve frame and the diaphragm component. One end of the balance channel communicates with the first channel, and the other end communicates with the second channel. The diaphragm component can deform itself according to the pressure magnitude of the first channel and change the cross-sectional area of the balance channel.

[0007] The present invention is further provided with, wherein, a first contact surface is formed on the balance valve frame or the valve core seat; a second contact surface adapted to the first contact surface is provided on the diaphragm component; at least one balance groove is provided on the first contact surface or / and the second contact surface, one end of the balance groove communicates with the first channel and the other end communicates with the second channel; when the second contact surface abuts against the first contact surface, all the balance grooves form a balance channel.

[0008] The present invention is further provided with, wherein, the valve core seat is installed inside the balance valve frame, and a diaphragm installation cavity for installing the diaphragm component is formed between the two. At least one first through hole communicating with the diaphragm installation cavity is provided on the balance valve frame, and at least one second through hole communicating with the diaphragm installation cavity is provided on the valve core seat. One end of the balance groove communicates with the first through hole and the other end communicates with the second through hole.

[0009] The present invention is further provided with, the first contact surface is a plane or a conical surface; the first through hole or the second through hole is opened at the center position of the first contact surface, and the balance grooves are circumferentially distributed around the first through hole or the second through hole on the first contact surface or the second contact surface.

[0010] The present invention is further provided with, wherein, the diaphragm component includes a circular diaphragm main body portion and a plurality of diaphragm support portions arranged on the outer periphery of the diaphragm main body portion. A support portion gap is formed between two adjacent diaphragm support portions, and the balance groove can communicate with the first channel or the second channel through the support portion gap.

[0011] The present invention is further provided with, wherein, the diaphragm component further includes a sealing protrusion for sealing the first through hole or the second through hole for liquid inlet.

[0012] The present invention is further provided with, wherein, the balance valve frame has a valve core installation hole communicating with the first channel and the second channel; the valve core seat is movably arranged in the valve core installation hole, and at least one diversion groove is provided on its side wall; a valve core seat sealing ring for sealing the valve core installation hole is provided at one end of the valve core seat, and a diaphragm component is installed at the other end. The outer periphery of the diaphragm component abuts against the outer periphery of the first contact surface; the balance grooves are circumferentially distributed around the diaphragm component on the first contact surface or the second contact surface.

[0013] The present invention is further provided with, wherein, the valve core seat has an annular side wall, one end of the annular side wall is a closed end and the other end is an installation end, and it is arranged on the balance valve frame. The outer surface of the annular side wall forms the first contact surface; the diaphragm component is annular and is sleeved on the annular side wall. The inner side wall of the diaphragm component forms the second contact surface; the balance channel includes at least one balance groove opened on the first contact surface or the second contact surface and a through hole opened at the end of the balance groove and communicating with the inner cavity of the valve core seat.

[0014] The present invention is further provided with a check valve, wherein the balance valve housing has a valve core mounting hole communicating with the first channel and the second channel, and the valve core mounting hole is located inside the valve core seat; a check valve is installed on the valve core mounting hole.

[0015] A balance valve for use in a pipe-in-pipe system includes a valve body and a balance valve core disposed inside the valve body. The balance valve core is the balance valve core for use in the pipe-in-pipe system as described above, and the balance valve core is integrally or separately disposed on the valve body through a balance valve housing.

[0016] A pipe-in-pipe circulation system includes a pipe-in-pipe pipeline and functional modules. The pipe-in-pipe pipeline has a main pipeline and a plurality of branch pipelines disposed on the main pipeline. Both of them have a first channel and a second channel, and a balance valve core or a balance valve is disposed at the end of the branch pipeline; the functional modules include a circulation pump and functional components for processing the medium. The liquid outlet end of the circulation pump communicates with the first channel of the main pipeline, and the liquid inlet end of the circulation pump communicates with the second channel of the main pipeline, thereby forming a circulation loop; the balance valve core is the balance valve core for use in the pipe-in-pipe system as described above, and the balance valve is the balance valve for use in the pipe-in-pipe system as described above; when the first channel is pressurized for circulation, the reflux flow rate of the branch pipeline far from the circulation pump can be greater than or equal to the reflux flow rate of the branch pipeline close to the circulation pump.

[0017] The prominent and beneficial technical effects of the present invention compared with the prior art are as follows:

[0018] 1. The balance valve core of the present invention includes a balance valve housing, a valve core seat and a diaphragm component. A balance channel is provided between the valve core seat and the diaphragm component or between the balance valve housing and the diaphragm component. The diaphragm component can deform itself according to the pressure of the first channel and change the cross-sectional area of the balance channel. When the medium pressure in the first channel is greater, the actual reflux cross-sectional area of the balance channel is smaller, thereby realizing the adjustment of the reflux flow rate between the first channel and the second channel.

[0019] 2. In some embodiments of the present invention, balance grooves are provided on the diaphragm component. The influence of its own deformation on the cross-section of the balance grooves is relatively large, and the control accuracy is relatively high; at the same time, the circumferential distribution of multiple balance grooves can increase the reflux flow rate of the balance channel, ensure the strength of the diaphragm component, facilitate better reset, and also increase the service life of the diaphragm component.

[0020] 3. The present invention is provided with check structures such as sealing protrusions and check valves, so that the balance valve has the advantages of both reflux flow rate adjustment and prevention of medium reflux.

[0021] 4. A balance valve core is installed at the end of each branch of the present invention. When the in-pipe circulation system performs internal circulation, for the balance valve core of the branch close to the circulation pump, due to the relatively large medium pressure, the deformation of the diaphragm component is relatively large, and the return flow of the balance channel is relatively small; for the balance valve core of the branch far from the circulation pump, due to the relatively small pressure, the deformation of the diaphragm component at this place is relatively small, and the return flow of the balance channel is relatively large. Therefore, the return flow of the branch far from the circulation pump is greater than or equal to the return flow of the branch close to the circulation pump, achieving the effect that the return flow is smaller near and larger far away, ensuring the circulation efficiency and water quality of the distal branch, and thus improving the overall circulation efficiency and water quality of the in-pipe circulation system. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the in-pipe circulation system of the present invention.

[0023] Figure 2 is a schematic installation diagram of the first balance valve core of the present invention.

[0024] Figure 3 is a cross-sectional view of the first balance valve core of the present invention.

[0025] Figure 4 is Figure 3 the cross-sectional view taken along line A-A in

[0026] Figure 5 is a schematic diagram of the state of the balance valve core when the in-pipe circulation system has return flow at the branch end.

[0027] Figure 6 is a schematic installation diagram of the second balance valve core of the present invention.

[0028] Figure 7 is a cross-sectional view of the second balance valve core of the present invention.

[0029] Figure 8 is a schematic installation diagram of the third balance valve core of the present invention.

[0030] Figure 9 is a cross-sectional view of the third balance valve core of the present invention.

[0031] Figure 10 is a schematic installation diagram of the balance valve and the fourth balance valve core of the present invention.

[0032] Figure 11 is Figure 10 the partial enlarged view at C in

[0033] Figure 12 is a schematic installation diagram of the fifth balance valve core of the present invention.

[0034] Figure 13 is a cross-sectional view of the fifth balance valve core of the present invention.

[0035] Figure 14 is Figure 13 A cross-sectional view at the C-C position in it.

[0036] The meanings represented by the reference numerals in the figure are as follows:

[0037] The pipe-in-pipe pipeline 1, the functional module 2, the balance valve core 3, the balance valve 4,

[0038] The main pipeline 11, the branch pipeline 12, the pipe-in-pipe 13, the pipe joint 14, the inner pipe 141, the outer pipe 142,

[0039] The circulation pump 21, the functional component 22, the inlet check valve 23, the return check valve 24, the inlet pipe 25, the return pipe 26,

[0040] The balance valve bracket 31, the valve core mounting hole 311, the inner mounting portion 312, the partition portion 3121, the outer mounting portion 313, the connecting portion 314, the first through hole 315; the outer annular limiting portion 316,

[0041] The valve core seat 32, the second through hole 321, the flow guiding groove 322, the annular side wall 323, the closed end 324, the mounting end 325, the valve core seat sealing ring 326,

[0042] The diaphragm component 33, the diaphragm main body portion 331, the diaphragm support portion 332, the support portion gap 333, the sealing protrusion 334,

[0043] The balance channel 34, the first contact surface 341, the second contact surface 342, the balance groove 343, the through hole 344,

[0044] The valve core sealing ring 35,

[0045] The check valve 36, the check valve core 361, the check valve sealing ring 362, the check valve return member 363,

[0046] The valve body 41, the adapter 42, the inner annular limiting portion 421. Specific embodiments

[0047] The present invention will be further described below in conjunction with specific embodiments:

[0048] Embodiment 1:

[0049] As Figure 1 shown, a pipe-in-pipe circulation system, especially a direct drinking water circulation system, is mainly used in scenarios such as residential buildings, villas, hotels, etc. that need to provide direct drinking water, and it includes a pipe-in-pipe pipeline 1 and a functional module 2.

[0050] Among them, the pipe-in-pipe pipeline 1 has a main pipeline 11 and a number of branch pipelines 12 provided 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, both the pipe-in-pipe 13 and the pipe joint 14 include an inner pipe 141, an outer pipe 142, and a connecting part connecting the two. The inner pipe 141 forms an inner flow channel, and an outer flow channel is formed between the inner pipe 141 and the outer pipe 142. The pipe joint 14 installed at the end of the branch pipeline 12 generally includes at least one pipe-in-pipe connection end connecting the pipe-in-pipe 13 and at least one pipe-in-pipe liquid outlet end connecting an external device such as an ordinary angle valve. The inner cavity of the pipe-in-pipe liquid outlet end can communicate the inner flow channel and the outer flow channel. The pipe joint 14 shown in this embodiment has one pipe-in-pipe connection end and one pipe-in-pipe liquid outlet end.

[0051] In this embodiment, the functional module 2 includes a circulation pump 21, a functional component 22 for processing the medium, an inlet check valve 23, an inlet pipe 25, a return check valve 24, and a return pipe 26. The inlet pipe 25 is sequentially connected to the circulation pump 21 and the functional component 22 through the inlet check valve 23. The functional component 22 is preferably a water filter or a disinfector. The liquid outlet end of the circulation pump 21 is connected to the first channel of the main pipeline 11 through the functional component ^22^. The liquid inlet end of the circulation pump 21 is also connected to the second channel of the main pipeline 11 through the return check valve 24 and the return pipe 26. At this time, a circulation loop is formed among the circulation pump 21, the functional component 22, the first channel, and the second channel. When the circulation pump 21 is turned on, the direct drinking water inside the pipeline can continuously circulate through the functional component 22 to ensure the water quality of the direct drinking water. Among them, the position sequence of the circulation pump 21 and the functional component 22 can be set according to actual needs.

[0052] In this embodiment, since the outer flow channel circulates inwardly to the inner flow channel, the outer flow channel is the first channel and the inner flow channel is the second channel. In other embodiments, the first channel can also be the inner flow channel, and then the second channel is the outer flow channel, that is, the inner flow channel circulates outwardly to the outer flow channel.

[0053] As Figure 2 shown, a balance valve core 3 capable of communicating the first channel and the second channel or a balance valve 4 containing the balance valve core 3 is provided at the end of each branch pipeline 12 in this embodiment. Specifically, a pipe joint 14, a balance valve core 3, and a control valve are provided at the end of the branch pipeline 12, or a pipe joint 14 and a balance valve 4 containing the balance valve core 3 are provided at the end of the branch pipeline 12.

[0054] This embodiment is provided with a balance valve 4 containing a balance valve core 3. The balance valve 4 is an angle valve, which has a valve body 41. The valve body 41 has an angle valve installation end, an angle valve control end for installing a control valve core, and an angle valve output end for connecting a water outlet device such as a faucet. Inside the angle valve installation end, a balance valve core 3 is arranged. The balance valve core is integrally or separately arranged on the valve body 41 through a balance valve frame 31. The outside of the angle valve installation end is installed in the threaded hole of the pipe joint 14.

[0055] In this embodiment, the balance valve core 3 is mainly used to control the return flow rate from the first channel (outer flow channel) to the second channel (inner flow channel).

[0056] Such as Figure 3 、 4 As shown, the balance valve core 31 includes a balance valve frame 31, a valve core seat 32, a diaphragm component 33, and a valve core sealing ring 35.

[0057] The balance valve frame 31 has an integrally formed inner installation part 312, an outer installation part 313, and several connecting parts 314 for connecting the inner installation part 312 and the outer installation part 313. The inner installation part 312 is of a tubular structure, and a partition part 3121 protrudes from the inner wall of its upper end. At least one first through hole 315 is opened on the partition part 3121; an internal thread part for installing the valve core seat 32 is arranged inside it; and a valve core sealing ring 35 is installed at its lower end.

[0058] At the end of the inner pipe 141 of the pipe joint 14 (i.e., the liquid outlet end of the pipe-in-pipe), an installation step is provided. The inner wall of the inner installation part 312 is installed on the installation step, and a valve core sealing ring 35 is arranged between the installation step and the inner installation part 312, so as to realize the sealing and positioning of the balance valve frame 31 and the inner pipe 141. The outside of the outer installation part 313 is provided with connection structures such as external threads, and can be directly or indirectly installed on the outer pipe of the pipe joint 14 (i.e., the liquid outlet end of the pipe-in-pipe). The balance valve core 31 of this embodiment is indirectly installed on the outer pipe of the pipe joint 14 through the valve body 41 of the balance valve 4.

[0059] The outer installation part 31 is integrally and fixedly connected to the inner installation part 312 through the connecting part 314. The connecting part 314 is used to connect the inner installation part 312 and the outer installation part 313 on the one hand, and can conduct the outer flow channel on the other hand. At this time, with the first through hole 315 as the demarcation point, the balance valve frame 31 can separate the first channel (outer flow channel) and the second channel (inner flow channel).

[0060] The diaphragm component 33 has a circular diaphragm main body portion 331, a plurality of diaphragm support portions 332 provided on the outer periphery of the diaphragm main body portion 331, and a sealing protrusion 334 provided in the middle of the diaphragm main body portion 331. The three are integrally formed, and a support portion gap 333 is formed between two adjacent diaphragm support portions 332. The sealing protrusion 334 is used to seal the first through hole 315 or the second through hole 321 for liquid inlet to prevent backflow. In this embodiment, the sealing protrusion 334 is used to seal the first through hole 315.

[0061] An external thread portion adapted to the internal thread portion of the internal installation portion 312 and a valve core seat sealing ring 326 are provided on the outer side of the valve core seat 32. When the valve core seat 32 is threadedly installed on the balance valve frame 31, the valve core seat sealing ring 326 is provided between the valve core seat 32 and the internal installation portion 312 of the balance valve frame 31.

[0062] In this embodiment, a diaphragm installation cavity for installing the diaphragm component 33 is formed between the valve core seat 32 and the partition portion 3121 of the internal installation portion 312. At least one second through hole 321 communicating with the diaphragm installation cavity is provided on the valve core seat 32. The first through hole 315, the diaphragm installation cavity, and the second through hole 321 communicate with each other.

[0063] A balance channel 34 is provided between the valve core seat 32 and the diaphragm component 33 or between the balance valve frame 31 and the diaphragm component 33. One end of the balance channel 34 communicates with the first channel, and the other end communicates with the second channel; the diaphragm component 33 can deform itself according to the pressure magnitude of the first channel and change the cross-sectional area of the balance channel 34. Specifically, a first contact surface 341 is formed on the balance valve frame 31 or the valve core seat 32, and a second contact surface 342 adapted to the first contact surface 341 is provided on the diaphragm component 33; at least one balance groove 343 is provided on the first contact surface 341 or / and the second contact surface 342. One end of the balance groove 343 communicates with the first channel, and the other end communicates with the second channel; when the second contact surface 342 abuts against the first contact surface 341, all the balance grooves 343 form the balance channel 34.

[0064] In this embodiment, a first contact surface 341 is formed on the valve core seat 32, and a second through hole 321 is provided at the center position of the first contact surface 341.

[0065] A second contact surface 342 is provided on the diaphragm component 33, such as Figure 4As shown, there are four balance grooves 343 circumferentially distributed on the second contact surface 342. The four balance grooves 343 are in a cross shape. The outer end of each balance groove 343 corresponds to a support portion gap 333, and the inner ends of each balance groove 343 converge and correspond to the second through hole 321. That is, the balance grooves 343 are circumferentially distributed on the second contact surface 342 with the second through hole 321 as the center. At this time, the balance grooves 343 can communicate with the first channel (outer flow channel) through the support portion gap 333 and the first through hole 315. At the same time, the balance grooves 343 communicate with the second channel (inner flow channel) through the second through hole 321.

[0066] In this embodiment, balance grooves 343 are provided on the diaphragm component 33. Its own deformation has a relatively large impact on the cross-section of the balance grooves 343, and the control accuracy is relatively high. At the same time, the circumferential distribution of multiple balance grooves 343 can increase the return flow rate of the balance channel 34, ensure the strength of the diaphragm component 33, facilitate better reset, and also increase the service life of the diaphragm component 33.

[0067] As Figure 5 shown, when the pressure of the first channel (outer flow channel) is greater than the pressure of the second channel (inner flow channel), the diaphragm component 33 is deformed by the force and deforms towards the first contact surface 341 of the valve core seat 32. At the same time, the first through hole 315 is opened, and the medium in the first channel (outer flow channel) can sequentially pass through the first through hole 315, the support portion gap 333, the balance grooves 343, and the second through hole 321 to enter the second channel (inner flow channel).

[0068] The first contact surface 341 is a plane or a conical surface. The conical surface can play a certain role in guiding the flow. At the same time, when the diaphragm component 33 is pressed, it can provide a larger deformation space for the diaphragm component 33.

[0069] When the first contact surface 341 and the second contact surface 342 are in contact with each other, all the balance grooves 343 form a balance channel 34. The return flow rate of the balance channel 34 is equivalent to the sum of the return flow rates of each balance groove 343. Its return flow rate depends on the return flow rate of each balance groove 343, and the return flow rate of the balance groove 343 depends on the minimum cross-section of the balance groove 343. In this embodiment, the diaphragm component 33 and the valve core seat 32 are in contact, making the balance groove 343 equivalent to a return flow channel. The cross-section of the return flow channel is jointly determined by the diaphragm component 33 and the valve core seat 32. The size of the valve core seat 32 remains unchanged, but since the diaphragm component 33 itself will deform according to the change of the medium pressure, the greater the medium pressure in the first channel (outer flow channel), the greater the deformation of the diaphragm component 33, and the closer it is to the first contact surface 341. Then the minimum cross-section of the return flow channel formed by the balance groove 343 is smaller, that is, the return flow rate is smaller.

[0070] As Figure 1As shown in the figure, a balance valve core 3 is installed at the end of each branch of the pipe-in-pipe circulation system. When the pipe-in-pipe circulation system conducts internal circulation (i.e., when the circulation pump 21 is working), the balance valve core 3 of the branch close to the circulation pump has a relatively large pressure, the deformation of the diaphragm component 33 is relatively large, and the return flow of the balance channel 34 is relatively small; the balance valve core 3 of the branch far from the circulation pump has a relatively small pressure, the deformation of the diaphragm component 33 at this place is relatively small, and the return flow of the balance channel 34 is relatively large. Therefore, the return flow of the branch 12 far from the circulation pump 21 is greater than or equal to the return flow of the branch 12 close to the circulation pump 21, achieving the effect that the return flow is smaller near the pump and larger far away, 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.

[0071] In another embodiment, the pipe joint 14 can directly install the balance valve core 3. This solution can also be understood as a balance valve 4 with a balance valve core 3. The pipe joint 14 is equivalent to the valve body 41, and control valves such as angle valves are directly installed on the pipe joint 14, so as to achieve the same effect.

[0072] In another embodiment, the balance valve core 3 can also be used to control the return flow of the second channel (inner flow channel) to the first channel (outer flow channel).

[0073] In another embodiment, the pipe-in-pipe circulation system can also be used in a hot water outlet system. At this time, the functional component 22 is a water heater.

[0074] Embodiment 2:

[0075] This embodiment is basically the same as Embodiment 1, and the difference lies in the balance valve core 3.

[0076] As Figure 6 、 7 shown, the balance valve frame 31 has an integrally formed inner installation part 312, an outer installation part 313, and several connecting parts 314 for connecting the inner installation part 312 and the outer installation part 313. The inner installation part 312 is a tubular structure, and a partition part 3121 protrudes from the inner wall of the middle part. At least one first through hole 315 is opened on the partition part 3121; an internal thread part for installing the valve core seat 32 is arranged at the upper end part; a valve core sealing ring 35 adapted to the inner pipe is installed at the lower end part. The outer side of the outer installation part 313 is provided with connection structures such as external threads and can be directly installed on the outer pipe of the pipe joint 14 or the valve body 41 of the balance valve 4.

[0077] An external thread portion adapted to the internal thread portion of the internal installation portion 312 is provided on the outer side of the valve core seat 32. After installation, a diaphragm installation cavity for installing the diaphragm component 33 is formed between the valve core seat 32 and the partition portion 3121 of the internal installation portion 312. At least one second through hole 321 communicating with the diaphragm installation cavity is provided on the valve core seat 32, and the second through hole 321, the diaphragm installation cavity, and the first through hole 315 communicate with each other.

[0078] The structure of the diaphragm component 33 is basically the same as that of the first embodiment, having a circular diaphragm main body portion 331, a plurality of diaphragm support portions 332 provided on the outer periphery of the diaphragm main body portion 331, and a sealing protrusion 334 provided in the middle of the diaphragm main body portion 331. The three are integrally formed, and the sealing protrusion 334 is used to seal the second through hole 321; a support portion gap 333 is formed between two adjacent diaphragm support portions 332. When the diaphragm component 33 moves in the diaphragm installation cavity, the diaphragm support portion 332 can also reduce the contact area with the balance valve frame 31, thereby reducing friction.

[0079] In this embodiment, a second contact surface 342 is provided on the diaphragm component 33, a first contact surface 341 is formed on the partition portion 3121, and a second through hole 321 is provided at the center position of the first contact surface 341. Four balance grooves 343 are circumferentially distributed on the first contact surface 341. The four balance grooves 343 are in a cross shape. The outer end of each balance groove 343 corresponds to a support portion gap 333, and the inner ends of each balance groove 343 converge and correspond to the first through hole 315. That is, the balance grooves 343 are circumferentially distributed on the first contact surface 341 with the first through hole 315 as the center.

[0080] When the pressure in the first channel (outflow channel) is greater than the pressure in the second channel (inflow channel), the diaphragm component 33 deforms under force and deforms towards the first contact surface 341 of the balance valve frame 31. At the same time, the second through hole 321 is opened, and the medium in the first channel (outflow channel) can sequentially pass through the second through hole 321, the support portion gap 333, the balance groove 343, and the first through hole 315 to enter the second channel (inflow channel).

[0081] When the diaphragm component 33 is pressed against the contact end of the balance groove 343, since there is no support point between the two contact ends of the balance groove 343, under the action of pressure, the diaphragm component 33 can continue to deform to affect the actual return cross-sectional area of the balance groove 343.

[0082] In order to ensure that the deformation of the diaphragm component 33 has an obvious influence on the cross-sectional shape of the balance groove 343, there must be a certain interval between the two contact ends of the balance groove 343. The larger the interval, the greater the influence of the deformation of the diaphragm component 33 on the cross-sectional shape of the balance groove 343.

[0083] Embodiment Three:

[0084] This embodiment is basically the same as the first embodiment, and the difference lies in the balance valve spool 3.

[0085] As Figure 8 , 9 shown, the balance valve holder 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 is a tubular structure, and a partition portion 3121 protrudes from the inner wall of its upper end. A spool mounting hole 311 communicating with the first channel and the second channel is provided on the partition portion 3121.

[0086] The spool seat 32 is movably arranged in the spool mounting hole 311, and at least one flow guiding groove 322 is provided on its side wall. In this embodiment, four flow guiding grooves 322 are circumferentially arranged. The axial length of the flow guiding groove 322 is greater than the inner wall length of the spool mounting hole 311. One end of the spool seat 32 is provided with a spool seat sealing ring 326 for sealing the spool mounting hole 311. The outer diameter of the spool sealing ring 35 is greater than the inner diameter of the spool mounting hole 311; the other end of the spool seat 32 is fixed with a diaphragm component 33. The outer periphery of the diaphragm component 33 abuts against the outer periphery of the first contact surface 341. The diaphragm component 33 has a reset function. When not subjected to the external medium pressure, the diaphragm component 33 drives the spool seat 32 to move and makes the spool seat sealing ring 326 seal the spool mounting hole 311.

[0087] In this embodiment, a second contact surface 342 is provided on the diaphragm component 33, and a first contact surface 341 is formed on the partition portion 3121. The first contact surface 341 is a conical surface. Four balance grooves 343 are circumferentially distributed on the first contact surface 341. The four balance grooves 343 are in a cross shape. The outer end of each balance groove 343 directly communicates with the first channel (outer flow channel), and the inner end of each balance groove 343 converges and corresponds to the spool mounting hole 311. That is, the balance grooves 343 are circumferentially distributed on the first contact surface 341 with the spool mounting hole 311 (equivalent to the first through hole) as the center.

[0088] When the pressure in the first channel (outer flow channel) is greater than the pressure in the second channel (inner flow channel), the diaphragm component 33 deforms under force and deforms towards the first contact surface 341 of the balance valve holder 31. At this time, the spool seat sealing ring 326 opens the spool mounting hole 311, so that the medium in the first channel (outer flow channel) can sequentially pass through the balance grooves 343, the flow guiding grooves 322, and the spool mounting hole 311 and enter the second channel (inner flow channel).

[0089] When the diaphragm component 33 is pressed against the contact end of the balance groove 343, since there is no support point between the two contact ends of the balance groove 343, under the action of the pressure, the diaphragm component 33 can continue to deform to affect the actual return cross-sectional area of the balance groove 343.

[0090] Embodiment 4:

[0091] This embodiment is basically the same as Embodiment 3, and the difference lies in the structures of the balance valve spool 3 and the balance valve 4.

[0092] As shown in Figure 10 、 11 , the balance valve holder 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 a partition portion 3121 protrudes from the inner wall of its lower end. A valve spool mounting hole 311 communicating with the first channel and the second channel is formed in the partition portion 3121.

[0093] The valve spool seat 32 is movably disposed in the valve spool mounting hole 311, and at least one flow guiding groove 322 is formed in its side wall. In this embodiment, four flow guiding grooves 322 are circumferentially arranged. The axial length of the flow guiding groove 322 is greater than the inner wall length of the valve spool mounting hole 311. One end of the valve spool seat 32 is provided with a valve spool seat sealing ring 326 for sealing the valve spool mounting hole 311. The outer diameter of the valve spool sealing ring 35 is greater than the inner diameter of the valve spool mounting hole 311; a diaphragm component 33 is installed at the other end of the valve spool seat 32. The outer periphery of the diaphragm component 33 abuts against the outer periphery of the first contact surface 341. The diaphragm component 33 has a reset function. When not subjected to the pressure of the external medium, the diaphragm component 33 drives the valve spool seat 32 to move and makes the valve spool seat sealing ring 326 seal the valve spool mounting hole 311.

[0094] In this embodiment, a first contact surface 341 is formed on the partition portion 3121. The first contact surface 341 is a conical surface; a second contact surface 342 is provided on the diaphragm component 33. Four balance grooves 343 are circumferentially distributed on the second contact surface 342. The four balance grooves 343 are in a cross shape. The outer end of each balance groove 343 directly communicates with the first channel (outer flow channel), and the inner end of each balance groove 343 converges and corresponds to the valve spool mounting hole 311. It is equivalent to that the balance grooves 343 are circumferentially distributed on the first contact surface 341 with the valve spool mounting hole 311 (equivalent to the first through hole) as the center.

[0095] When the pressure in the first channel (outer flow channel) is greater than the pressure in the second channel (inner flow channel), the diaphragm component 33 deforms under force and deforms towards the first contact surface 341 of the balance valve holder 31. At this time, the valve spool seat sealing ring 326 opens the valve spool mounting hole 311, so that the medium in the first channel (outer flow channel) can sequentially pass through the balance groove 343, the flow guiding groove 322, and the valve spool mounting hole 311 and enter the second channel (inner flow channel).

[0096] As shown in Figure 10As shown in the figure, the balance valve spool 3 of this embodiment is threadedly connected to the valve body 41 of the balance valve 4 through the balance valve frame 31. The valve body 41 is arranged on the pipe joint 14 through the adapter 42. One end of the pipe joint 14 has a threaded connection end and is fixed on the pipe joint 14 through the first sealing ring; the other end has a valve installation end, and at least one second sealing ring is installed on the inner wall of the valve installation end. The valve body 41 is inserted into the valve installation end, so that the valve body 41 can rotate 360° during use. An inner annular limiting portion 421 is provided on the inner wall between the threaded connection end and the valve installation end, and a corresponding outer annular limiting portion 316 is provided on the balance valve frame 31. After the balance valve frame 31 passes through the inner annular limiting portion 421, it is threadedly connected to the valve body 41. At this time, the outer annular limiting portion 316 abuts against one end of the inner annular limiting portion 421, thereby realizing the axial fixation of the adapter 42 and the valve body 41.

[0097] Embodiment Five:

[0098] This embodiment is basically the same as Embodiment One, and the difference lies in the balance valve spool 3.

[0099] As Figure 12 、 13 As shown in FIGS. 13 and 14, the balance valve frame 31 has an integrally formed inner installation portion 312, an outer installation portion 313, and a plurality of connecting portions 314 for connecting the inner installation portion 312 and the outer installation portion 313. The inner installation portion 312 is a tubular structure, and a partition portion 3121 protrudes from the inner wall of its upper end. A valve core installation hole 311 communicating with the first channel and the second channel is provided on the partition portion 3121. An external thread protrusion for installing the valve core seat 32 extends outside the partition portion 3121.

[0100] The valve core seat 32 has an annular side wall 323. One end of the annular side wall 323 is a closed end 324 and the other end is an installation end 325. The installation end 325 has an internal thread structure and is arranged on the balance valve frame 31 through the external thread protrusion. The valve core installation hole 311 is located inside the valve core seat 32.

[0101] The diaphragm component 33 is annular, and its length is the same as that of the annular side wall 323 and is sleeved on the annular side wall 323.

[0102] The balance channel 34 includes at least one balance groove 343 opened on the first contact surface 341 or the second contact surface 342 and a through hole 344 opened at the end of the balance groove 343 and communicating with the inner cavity of the valve core seat 32.

[0103] As Figure 14As shown, in this embodiment, the inner sidewall of the diaphragm member 33 forms a second contact surface 342, and the outer surface of the annular sidewall 323 forms a first contact surface 341. Three balance grooves 343 are axially formed on the first contact surface 341. The outer ends of the balance grooves 343 are directly communicated with the first channel (outer flow channel), and the inner ends of the balance grooves 343 are communicated with the inner cavity of the valve element seat 32 through the through holes 344. The inner cavity of the valve element seat 32 is communicated with the second channel (inner flow channel) through the valve element installation hole 311.

[0104] When the outer sidewall of the diaphragm member 33 receives the medium pressure, the part in contact with the balance groove 343 will deform towards the balance groove 343, thereby changing the actual return flow cross-section of the balance groove 343. The greater the medium pressure, the smaller the actual return flow cross-section of the balance groove 343.

[0105] Preferably, a check valve 36 is installed on the valve element installation hole 311. The check valve 36 includes a check valve element 361, a check valve sealing ring 362 and a check valve return member 363. A check valve sealing ring 362 is installed at one end of the check valve element 361. A return member installation portion is provided at the other end of the check valve element 361. The check valve return member 363 is sleeved on the check valve element 361, with one end abutted against the return member installation portion and the other end abutted against the balance valve frame 31.

[0106] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A diaphragm type balance valve core for use in a pipe-in-pipe, which is installed on a pipe-in-pipe pipeline (1) having a first channel and a second channel, characterized in that, Comprising: A balance valve holder (31), installed at the end of the pipe-in-pipe pipeline (1) and used for separating the first channel and the second channel; A valve core seat (32), installed on the balance valve holder (31); and A diaphragm component (33), installed on the valve core seat (32) or inside the balance valve holder (31), wherein a balance channel (34) is provided between the valve core seat (32) and the diaphragm component (33) or between the balance valve holder (31) and the diaphragm component (33), and one end of the balance channel (34) communicates with the first channel and the other end communicates with the second channel; The diaphragm component (33) can deform itself according to the pressure magnitude of the first channel and change the cross-sectional area of the balance channel (34).

2. A diaphragm type balance valve core for pipe-in-pipe according to claim 1, characterized in that: Among them, A first contact surface (341) is formed on the balance valve holder (31) or the valve core seat (32); A second contact surface (342) adapted to the first contact surface (341) is provided on the diaphragm component (33); At least one balance groove (343) is provided on the first contact surface (341) or / and the second contact surface (342), and one end of the balance groove (343) communicates with the first channel and the other end communicates with the second channel; When the second contact surface (342) abuts against the first contact surface (341), all the balance grooves (343) form the balance channel (34).

3. A diaphragm type balance valve core for pipe-in-pipe according to claim 2, characterized in that: Among them, The valve core seat (32) is installed inside the balance valve holder (31), and a diaphragm installation cavity for installing the diaphragm component (33) is formed between the two, At least one first through hole (315) communicating with the diaphragm installation cavity is provided on the balance valve holder (31), At least one second through hole (321) communicating with the diaphragm installation cavity is provided on the valve core seat (32), One end of the balance groove (343) communicates with the first through hole (315) and the other end communicates with the second through hole (321).

4. A diaphragm type balance valve core for pipe-in-pipe according to claim 3, characterized in that: The first contact surface (341) is a plane or a conical surface; The first through hole (315) or the second through hole (321) is opened at the central position of the first contact surface (341), The balance grooves (343) are circumferentially distributed on the first contact surface (341) or the second contact surface (342) with the first through hole (315) or the second through hole (321) as the center.

5. A diaphragm type balance valve core for pipe-in-pipe according to any one of claims 1-4, characterized in that: Among them, The diaphragm component (33) includes a circular diaphragm main body portion (331) and a plurality of diaphragm support portions (332) provided on the outer periphery of the diaphragm main body portion (331). A support portion gap (333) is formed between two adjacent diaphragm support portions (332). The balance groove (343) can communicate with the first channel or the second channel through the support portion gap (333).

6. A diaphragm type balance valve core for use in a pipe-in-pipe according to claim 5, characterized in that: Among them, The diaphragm component (33) further includes a sealing projection (334) for sealing the first through hole (315) or the second through hole (321) for liquid inlet.

7. A diaphragm type balance valve core for use in a pipe-in-pipe according to claim 2, characterized in that: Among them, The balance valve frame (31) has a valve core mounting hole (311) communicating the first channel and the second channel; The valve core seat (32) is movably disposed in the valve core mounting hole (311), and at least one diversion groove (322) is provided on its side wall; One end of the valve core seat (32) is provided with a valve core seat sealing ring (326) for sealing the valve core mounting hole (311), and the other end is mounted with the diaphragm component (33). The outer periphery of the diaphragm component (33) abuts against the outer periphery of the first contact surface (341); The balance groove (343) is circumferentially distributed around the diaphragm component (33) on the first contact surface (341) or the second contact surface (342).

8. A diaphragm type balance valve core for use in a pipe-in-pipe according to claim 2, characterized in that: Among them, The valve core seat (32) has an annular side wall (323). One end of the annular side wall (323) is a closed end (324) and the other end is a mounting end (325), and it is disposed on the balance valve frame (31). The outer surface of the annular side wall (323) forms the first contact surface (341); The diaphragm component (33) is annular and is sleeved on the annular side wall (323). The inner side wall of the diaphragm component (33) forms the second contact surface (342); The balance channel (34) includes at least one balance groove (343) provided on the first contact surface (341) or the second contact surface (342) and a through hole (344) provided at the end of the balance groove (343) and communicating with the inner cavity of the valve core seat (32).

9. A balanced valve for use in a pipe-in-pipe, characterized in that: It includes a valve body and a balance valve core (3) disposed in the valve body (41). The balance valve core (3) is the diaphragm type balance valve core for use in a pipe-in-pipe according to any one of claims 1-8, The balance valve core is integrally or separately disposed on the valve body (41) through the balance valve frame (31).

10. A tube-in-tube circulation system, characterized in that, It includes a pipe-in-pipe pipeline (1) and a functional module (2), The pipe-in-pipe pipeline (1) has a main pipeline (11) and a plurality of branch pipelines (12) provided on the main pipeline (11). Both have a first channel and a second channel, and a balance valve core (3) or a balance valve (4) is provided at the end of the branch pipeline (12); The function module (2) includes a circulation pump (21) and a functional component (22) for processing the medium. The liquid outlet end of the circulation pump (21) communicates with the first channel of the main pipeline (11), and the liquid inlet end of the circulation pump (21) communicates with the second channel of the main pipeline (11), thereby forming a circulation loop; The balance valve core (3) is the in-pipe membrane type balance valve core according to any one of claims 1-8; The balance valve (4) is the in-pipe balance valve according to claim 9; When the first channel is pressurized and circulated, the reflux flow rate of the branch (12) far from the circulation pump (21) can be greater than or equal to the reflux flow rate of the branch (12) close to the circulation pump (21).

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