A connecting valve and water supply system using the same

Abstract

A connecting valve comprises a valve body, in which a first flow channel arranged vertically and a return flow channel running through the first flow channel from left to right are provided in the valve body; it is characterized in that a return flow outlet is provided at the left end of the return flow channel, and a right mounting port is provided at the right end, and further comprises a valve core spring, a valve core, a partition plate and a right cover plate which can be mounted in the return flow channel through the right mounting port, at least three steps with gradually increasing diameters from left to right are formed in the return flow channel, namely a first step, a second step and a third step, the return flow outlet is located on the left side of the first step, the first step is located on the left side of the first flow channel, and the second step is located on the left side of the Between the first step and the first flow channel, the third step is located on the right side of the first flow channel; wherein the valve core spring and the valve core are arranged between the first step and the second step, the partition is sealed and connected to the second step, and a through hole is also provided on the partition, the two ends of the valve core spring are respectively connected to the first step and the valve core, and the valve core is sealed to the right on the through hole under the action of the valve core spring, and the right cover is detachably sealed and connected to the third step; it also includes a pre-filter connected to the right side of the partition, and the right end of the pre-filter extends into the first flow channel.

Description

Technical Field

[0001] The present invention relates to the technical field related to water heater equipment, and in particular to a connecting device and a water supply system using the same. Background Art

[0002] Conventional water heaters are usually connected to multiple faucets in a house to provide hot water throughout the house. However, each time a water heater is used, the cold water in the hot water pipe must be drained before hot water can be produced. This not only provides a poor user experience but also wastes a lot of water resources. To this end, people have invented a "zero cold water" water supply system. For example, Chinese utility model patent publication number CN208859893U discloses a water connection device and a water heater system. The water connection device includes a housing, a first pipe section, a second pipe section, and a guide pipe section connecting the first and second pipe sections. The housing has a first water inlet and a first water outlet connected to the first pipe section, the first pipe section is connected to the cold water pipe through the first water inlet and the first water outlet, the housing also has a second water inlet and a second water outlet connected to the second pipe section, the second pipe section is connected to the hot water pipe through the second water inlet and the second water outlet; a one-way valve is located in the guide pipe section and unidirectionally conducts water from the second pipe section to the first pipe section; and a filter is also included, the filter being installed at the second water inlet. When the "zero cold water" function is enabled in the water heater system, the pump in the water heater starts, and the hot water pipe and the cold water pipe form a one-way water circulation loop through the one-way valve of the water connection device. The cooled water in the hot water pipe flows into the cold water pipe through the one-way valve, and is further heated by the heating device in the water heater, and then flows into the hot water pipe to circulate and obtain hot water of the required temperature. When the water heater system is turned on and the hot water function is selected, hot water of the required temperature can be obtained directly, and the waste of water resources can be reduced.

[0003] However, the following problems exist in the prior art: First, the one-way valve is installed in the guide pipe section through the regulating port, and then the regulating valve is installed in the regulating port to limit the position of the one-way valve. However, the structure of the guide pipe section only provides a positioning step deep in the guide pipe section. The one-way valve is prone to incorrect or incomplete installation during installation, causing the one-way valve to fail and possibly causing the water heater to be opened by mistake; Second, the filter element is installed at the second water inlet. The filter element needs to be installed before connecting the hot water pipeline, and the filter element is used to block the sand and stone particles in the hot water pipeline. After a period of use, a large amount of sand and stone particles accumulated will cause the pipeline to be blocked, and subsequent maintenance and replacement are very inconvenient. Summary of the Invention

[0004] In order to overcome at least one of the above-mentioned problems existing in the connecting device of the prior art, the present invention proposes a connecting valve with better structure, including a valve body, in which a first flow channel arranged up and down and a return flow channel running through the first flow channel from left to right are provided; a return flow outlet is provided at the left end of the return flow channel, and a right mounting port is provided at the right end; the valve body also includes a valve core spring, a valve core, a partition plate and a right cover plate which can be installed in the return flow channel through the right mounting port; at least three steps with gradually increasing diameters from left to right are formed in the return flow channel, namely a first step, a second step and a third step, the return flow outlet is located on the left side of the first step, and the first step is located on the left side of the second step. On the left side of a flow channel, the second step is located between the first step and the first flow channel, and the third step is located on the right side of the first flow channel; wherein the valve core spring and the valve core are arranged between the first step and the second step, the partition is sealed and connected to the second step, and a through hole is also provided on the partition, the two ends of the valve core spring are respectively connected to the first step and the valve core, and the valve core is sealed to the right on the through hole under the action of the valve core spring, and the right cover is detachably sealed and connected to the third step; it also includes a pre-filter connected to the right side of the partition, and the right end of the pre-filter extends into the first flow channel.

[0005] The first flow channel is a channel for allowing liquid media to flow and is connected to the return channel. In the present invention, the first flow channel is provided with a first flow channel outlet and a first flow channel inlet at the upper and lower ends, respectively. The first flow channel inlet is connected to the heating device via a hot water pipe, and the first flow channel outlet is connected to a water outlet terminal (such as a faucet). In this way, hot water output from the heating device can flow through the first flow channel to the water outlet terminal or the return channel.

[0006] The return channel is a channel that is intersecting and connected to the first flow channel but extends in a different direction. In one specific embodiment, to facilitate the subsequent installation of the valve core spring, valve core, partition plate, and right cover plate, the return channel serves as the main channel and the first flow channel serves as the intersecting channel, that is, the diameter of the first flow channel at the intersection is no larger than the diameter of the return channel.

[0007] The three steps in the return channel are formed because the return channel's diameter is not uniform but segmented, with differences in height between each segment. To facilitate manufacturing, the diameters of the return channel segments increase gradually from left to right, with the return channel at the left end (where the return outlet is located) having the smallest diameter and the return channel at the right end (where the mounting port is located) having the largest diameter. To form the three steps, the return channel includes at least four segments of varying diameters, but in specific embodiments, no fewer than four segments can be provided.

[0008] Among them, the first step is a step located deeper in the reflux channel, which is used to connect with the elastic valve core spring. The valve core spring has good flexibility and relatively low requirements for installation accuracy, and is easy to install.

[0009] The second step is located in the middle of the return channel and relatively close to the first flow channel. It cooperates with the partition, making it easier to install the partition onto the step. Furthermore, the diameter of the return channel section forming the second step is no smaller than that of the first flow channel, making it less likely that the partition will fall into the first flow channel during installation.

[0010] Among them, the third step is a step arranged near the right mounting port, which is used to install the right cover plate. By controlling the depth of the third step, the installation position of the right cover plate can be controlled, thereby making the right cover plate basically flush with the outer wall of the valve body.

[0011] In which, the valve core is blocked to the right on the through hole under the action of the valve core spring, the partition is sealed and connected to the second step, the through hole is the channel through which the liquid flowing through the reflux channel must pass, and the valve core blocks the through hole to form a one-way valve structure. When the pressure of the liquid on the right side of the partition is greater than the sum of the pressure of the liquid on the left side and the force of the valve core spring, the valve core opens, and the liquid on the right side of the partition can flow to the left through the through hole and flow toward the reflux outlet.

[0012] Among them, the pre-filter is a mesh structure arranged upstream of the through hole for filtering sand and stone particles. The connection method of the pre-filter can be to connect it separately to the right side of the partition, or to connect one end to the right side of the partition and the other end to the right cover. Since the position of the pre-filter is very close to the intersection of the return channel and the first flow channel, the right end of the pre-filter at least partially extends into the first flow channel, and the liquid in the first flow channel can flow along the outer wall of the pre-filter, that is, the pre-filter does not completely block the first flow channel. Two specific arrangements are described here. In the first, the right end of the pre-filter extends into the middle of the first flow channel but does not pass through it completely; in the second, the right end of the pre-filter passes through the first flow channel and overlaps the right cover, but a gap is left between the outer wall of the pre-filter and the valve body to allow liquid to pass through. In this way, in addition to flowing into the reflux channel through the mesh of the pre-filter, part of the liquid in the first flow channel flows along the outer wall of the pre-filter, thereby flushing the outer wall of the pre-filter extending into the first flow channel.

[0013] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are: first, by arranging a multi-layer step structure in the reflux channel, it can not only provide installation positioning references for different components, but also allow components with low installation accuracy requirements to be installed at the bottom of the channel, and allow components with high sealing connection installation requirements (such as the partition and the right cover) to be installed closer to the right installation port, which not only reduces the installation difficulty, but also facilitates installation and inspection, and is conducive to improving the product qualification rate of the connecting valve; second, by arranging the pre-filter upstream of the through hole, it can not only effectively reduce sand Stone particles flow into the reflux channel and through the hole, and the right end of the pre-filter extends into the first flow channel, and can use the liquid flowing in the first flow channel to flush the outer wall of the pre-filter and take away the sand and stone particles blocking the outer wall of the pre-filter, thereby achieving the self-cleaning effect of the pre-filter and greatly improving the service life of the connecting valve; thirdly, the valve core spring, valve core, partition and pre-filter can all be installed in the reflux channel through the right mounting port, and the right cover plate can be detachably installed in the right mounting port, which is convenient for the later inspection and maintenance of the connecting valve.

[0014] A further technical solution may also include a post-filter, which is arranged on the left side of the first step to form a filtering effect downstream of the valve core. The post-filter is used to block sand and stone particles from entering the position where the valve core is placed from the reflux outlet, thereby greatly reducing the impact of sand and stone particles on the valve core. Of course, the position of the post-filter is flexible. For example, the post-filter is installed in the reflux channel, or the post-filter is installed at the reflux outlet, or one end of the post-filter is installed in the reflux channel, and the other end extends to the left to the outside of the reflux channel.

[0015] Furthermore, it also includes a second flow channel arranged at intervals on the left side of the first flow channel, the second flow channel is connected to the left end of the reflux channel, the reflux outlet is located at the intersection of the second flow channel and the reflux channel, and the post-filter is arranged in the reflux channel and / or the second flow channel. The second flow channel is one of the channels for allowing the liquid medium to flow. In one embodiment, the upper and lower ends of the second flow channel are respectively provided with a second flow channel outlet and a second flow channel inlet. The second flow channel outlet is connected to a water terminal (such as a faucet), and the second flow channel inlet is connected to a cold water pipe, and the cold water pipe has a branch pipe connected to the water inlet of the heating device. In this way, cold water can flow to the water terminal through the second flow channel; or when the water terminal is closed and the through hole is opened, the liquid in the first flow channel can enter the second flow channel through the reflux channel, and then flow back to the heating device through the cold water pipe.

[0016] In order to facilitate the installation of the post-filter and its subsequent maintenance, a left mounting port is further provided on the valve body. The left mounting port is connected to the second flow channel and is coaxially arranged with the return channel. The post-filter is installed in the second flow channel through the left mounting port but does not completely block the second flow channel. A left cover plate is also included. The left cover plate is sealed and connected to the left mounting port, and the post-filter is provided on the left cover plate. The advantage of arranging the post-filter in this way is that when cold water flows through the second flow channel, it can carry away sand and stone particles blocking the outer surface of the post-filter. The post-filter is not easily clogged, which further increases the service life of the connecting valve. The detachable mounting structure of the left cover plate also facilitates the subsequent maintenance of the connecting valve.

[0017] A further technical solution may be that the left cover plate and the right cover plate are provided with a plurality of left support rods and right support rods extending in the left and right directions, wherein the left support rod presses against the wall surrounding the reflux outlet, and the right support rod presses against the right side of the partition plate, the pre-filter is connected to the right support rod and arranged around the through hole, and the post-filter is connected to the left support rod and arranged around the reflux outlet. By providing the left and right support rods, on the one hand, support and positioning are provided for the pre-filter and post-filter, and on the other hand, the filter is reinforced to prevent deformation caused by impact during use, thereby ensuring the stability of the connecting valve.

[0018] A further technical solution may also be that the second flow channels located on both sides of the reflux outlet are respectively the second flow channel water inlet section and the second flow channel water outlet section, wherein the minimum water flow cross-sectional area of the second flow channel water outlet section is A1, and a limiting flow plate is provided in the second flow channel water outlet section, and at least one limiting flow hole is provided on the limiting flow plate, and the sum of the water flow cross-sectional areas of the limiting flow holes is A2, wherein A2:A1=0.04~0.25. The limiting flow hole can be provided singly or multiple, and when multiple limiting flow holes are provided, the water flow cross-sectional area of the limiting flow hole is the sum of the water flow cross-sectional areas of all limiting flow holes. When the second flow channel is used alone for water supply, the overall flow rate of water in the second flow channel is fast, and the overall pressure in the flow channel becomes smaller, thereby forming a pressure difference with the water pressure in the first flow channel, and this pressure difference may cause the valve core to open. In order to solve this problem, the limiting plate is set in the water outlet section of the second flow channel. On the premise of meeting the water output, the flow rate of water is increased when passing through the limiting hole, while the flow rate upstream of the limiting plate (that is, the water inlet section of the second flow channel and a section of the second flow channel next to the reflux outlet) is reduced. According to Bernoulli's principle, the pressure drop upstream of the limiting plate becomes relatively smaller, and the pressure difference between it and the water pressure in the first flow channel is also relatively smaller. In this way, the probability of the valve core opening can be greatly reduced, that is, the problem of water cross-flow between the first flow channel and the second flow channel during abnormal reflux can be reduced.

[0019] A further technical solution may be that the outer circumference of the partition is provided with at least one ring of ribs, the maximum outer diameter of the ribs being no less than the inner diameter of the second step, and when the partition is connected to the second step, the ribs form a sealed connection with the second step. Preferably, the maximum outer diameter of the ribs is greater than the inner diameter of the second step, and the ribs have a certain degree of elasticity. When the partition is installed on the second step, the ribs are squeezed and overturned toward the right installation opening. In this way, the ribs not only press against the second step under their own elastic force, but also clamp onto the second step to prevent the partition from falling out toward the right installation opening.

[0020] The valve core is the core component of the connecting valve. In order to ensure the installation and movement stability of the valve core, a further technical solution may also include a left guide part and a right guide part arranged in the reflux channel, the left guide part includes a left guide ring and a left connecting foot, the left connecting foot is respectively connected to the left guide ring and the first step, the right guide part includes a right guide ring and a right connecting foot, the right connecting foot is respectively connected to the right guide ring and the partition; the left and right ends of the valve core are respectively provided with a left guide column and a right guide column, the left guide column is movably inserted in the left guide ring, and the right guide column is movably inserted in the right guide ring.

[0021] Although the pre-filter and post-filter can block some larger sand and stone particles, some fine sand and stone particles can still enter the installation area of the valve core. Furthermore, a number of tooth-shaped ribs extending along the axial direction are evenly arranged on the side walls of the left guide column and the right guide column. When viewed along the axial direction of the guide column, the cross-section of the tooth-shaped ribs is gear-shaped. The left and right guide columns arranged in this way will form small cavities and large cavities arranged at intervals of different sizes when matched with the left and right guide rings. When fine sand and stone particles are stuck in the small cavities, due to the small and unstable contact surface between the tooth-shaped ribs and the fine sand and stone particles, the fine sand and stone particles will slide into the large cavity and be washed away. This structure not only ensures a matching structure with a small gap between the guide column and the ring hole, but also reduces the possibility of the guide column being stuck, greatly improving the stability of the valve core.

[0022] Since the connecting valve has the above advantages, it can be applied to water supply systems. Common water supply systems are divided into water supply systems without return pipes and water supply systems with return pipes, which are described below respectively.

[0023] The first is a return pipe-free water supply system, comprising a heating device, a water outlet terminal and the connecting valve, wherein the heating device is provided with a water inlet, a water outlet and a circulating pump, the water outlet terminal is provided with a terminal cold water inlet and a terminal hot water inlet, and the valve body of the connecting valve is also provided with a first flow channel inlet and a first flow channel outlet communicating with the first flow channel; further comprising a first cold water pipe, a second cold water pipe, a third cold water pipe, a first hot water pipe, a second hot water pipe and a three-way valve, the three-way valve comprising a first valve port, a second valve port and a third valve port, wherein the first cold water pipe is connected to the water inlet of the heating device, the second cold water pipe is connected to the first valve port of the three-way valve, two ends of the third cold water pipe are respectively connected to the second valve port of the three-way valve and the terminal cold water inlet of the water outlet terminal, two ends of the first hot water pipe are respectively connected to the water outlet of the heating device and the first flow channel inlet of the connecting valve, two ends of the second hot water pipe are respectively connected to the first flow channel outlet of the connecting valve and the terminal hot water inlet of the terminal, and the third valve port of the three-way valve is connected to the return outlet of the connecting valve.

[0024] The second type is a water supply system with a return pipe, including a heating device, a water outlet terminal and the connecting valve, the heating device is provided with a water inlet and a water outlet and a circulating pump, the water outlet terminal is provided with a terminal cold water inlet and a terminal hot water inlet, and the valve body of the connecting valve is also provided with a first flow channel inlet and a first flow channel outlet connected to the first flow channel; it also includes a first cold water pipe, a second cold water pipe, a first hot water pipe, a second hot water pipe, a return pipe and a three-way valve, the three-way valve includes a first valve port, a second valve port and a third valve port, wherein the first valve port of the three-way valve is connected to the water inlet of the heating device, the first cold water pipe is connected to the second valve port of the three-way valve, the second cold water pipe is connected to the terminal cold water inlet of the water outlet terminal, the two ends of the first hot water pipe are respectively connected to the water outlet of the heating device and the first flow channel inlet of the connecting valve, the two ends of the second hot water pipe are respectively connected to the first flow channel outlet of the connecting valve and the terminal hot water inlet of the terminal, and the two ends of the return pipe are respectively connected to the return outlet of the connecting valve and the third valve port of the three-way valve.

[0025] Since the present invention has the above characteristics and advantages, it can be applied to a water supply system having a connecting valve and application thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the axial structure of a connecting valve using the technical solution of the present invention;

[0027] Figure 2 is a schematic diagram of the explosion structure of the connecting valve;

[0028] Figure 3is a schematic diagram of the cross-sectional structure of the connecting valve when viewed from the front;

[0029] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure in the AA direction;

[0030] Figure 5 yes Figure 4 The schematic diagram of the partially enlarged structure at M in the middle;

[0031] Figure 6 is a schematic diagram of the cross-sectional structure of the valve body in the front view direction;

[0032] Figure 7 is a schematic diagram of the explosion structure of the valve core;

[0033] Figure 8 Schematic diagram of the structure of the partition in the axial direction;

[0034] Figure 9 is a schematic diagram of an exploded structure of the connecting valve, showing the structure with the second flow channel;

[0035] Figure 10 is a schematic diagram of a cross-sectional structure of the connecting valve in a front view direction, showing the structure with the second flow channel;

[0036] Figure 11 It is a schematic diagram of the first type of water supply system, showing a water supply system without a return pipe;

[0037] Figure 12 This is a diagram of the second type of water supply system, showing a water supply system with a return pipe. Implementation Method

[0038] The structure of the connecting valve 1 and the water supply system to which the connecting valve 1 is applied will be further described below with reference to the accompanying drawings.

[0039] Except for those explicitly stated to be equivalent or alternative implementation schemes, the various implementation details disclosed below can be selectively applied or combined in one embodiment even if they have no direct correlation or synergistic relationship in terms of function.

[0040] like Figures 1 to 6As shown, the connecting valve 1 proposed by the present invention includes a valve body 10, in which a first flow channel 21 arranged vertically and a return channel 3 running through the first flow channel 21 from left to right are provided. The left end of the return channel 3 is provided with a return outlet 31, and the right end is provided with a right mounting port 32. The valve body 10 also includes a valve core spring 4, a valve core 5, a partition plate 6 and a right cover plate 7 that can be installed in the return channel 3 through the right mounting port 32; at least three steps with gradually increasing diameters from left to right are formed in the return channel 3, namely a first step 33, a second step 34 and a third step 35, the return outlet 31 is located on the left side of the first step 33, the first step 33 is located on the left side of the first flow channel 21, and the second step 34 is located on the left side of the first flow channel 21. Between the first step 33 and the first flow channel 21, the third step 35 is located on the right side of the first flow channel 21; wherein, the valve core spring 4 and the valve core 5 are arranged between the first step 33 and the second step 34, the partition 6 is sealed and connected to the second step 34, and the partition 6 is also provided with a through hole 60, the two ends of the valve core spring 4 are respectively connected to the first step 33 and the valve core 5, and the valve core 5 is blocked to the right on the through hole 60 under the action of the valve core spring 4, and the right cover plate 7 is detachably sealed and connected to the third step 35; it also includes a pre-filter 81 connected to the right side of the partition 6, and the right end of the pre-filter 81 extends into the first flow channel 21.

[0041] like Figure 6 As shown, the first flow channel 21 is provided with a first flow channel outlet 211 and a first flow channel inlet 212 at the upper and lower ends, respectively. After the first flow channel 21 intersects and connects with the return channel 3, the first flow channel outlet 211, the first flow channel inlet 212, the return outlet 31, and the right mounting port 32 are respectively arranged on the upper, lower, left, and right sides of the valve body 10. The first flow channel 21 has a first central axis K, and the return channel 3 has a return central axis L. In this embodiment, the first central axis K and the return central axis L intersect. The diameter of the return channel 3 is not a single, fixed diameter, but is segmented, with different diameters between each segment, thereby forming a drop. For ease of manufacturing, the diameters of the various segments of the return channel 3 gradually increase from left to right, i.e., the diameter of the return channel 3 at the end of the return outlet 31 is the smallest, and the diameter of the return channel 3 at the end of the mounting port is the largest. At the intersection of the first flow channel 21 and the reflux channel 3 , the diameter of the first flow channel 21 is smaller than the diameter of the reflux channel 3 .

[0042] like Figure 3 and Figure 6As shown, the three steps in the return channel 3 are formed by at least four sections of different diameters. Of course, the return channel 3 can have more than four sections of different diameters, or more than three steps. The three steps are described in detail below: The first step 33 is located deeper on the left end of the return channel 3. It is used to connect with the elastic valve core spring 4. The valve core spring 4 has good flexibility and requires less installation precision. The second step 34 is located in the middle of the return channel 3 and relatively close to the first flow channel 21. It is used to mate with the partition 6, making it easier to install. Furthermore, the diameter of this section of the return channel 3 is larger than that of the first flow channel 21, making it easier to install the partition 6 and less likely to fall into the first flow channel 21. To ensure a sealed connection, a partition seal 61 is provided between the partition 6 and the wall of the valve body 10. The third step 35 is located near the right mounting opening 32 and is used to install the right cover plate 7. To form a sealed connection, a right cover plate sealing ring 71 is also provided between the right cover plate 7 and the wall of the valve body 10. The multi-layered step structure not only provides a positioning reference for the various components installed in the reflux channel 3, but also allows components with lower installation precision to be installed at the bottom of the channel, while components with higher installation precision (such as the partition plate 6 and right cover plate 7) are installed closer to the right mounting opening 32. This not only reduces installation difficulty but also facilitates inspection and installation, thereby improving the product qualification rate of the connecting valve 1.

[0043] The right cover plate 7 is also provided with a plurality of right support rods 72 extending from right to left. The right support rods 72 press against the right side of the partition plate 6. The right end of the cylindrical pre-filter 81 is sleeved on the right support rod 72, and the left end is connected to the partition plate 6. In this way, the pre-filter 81 filters sand and gravel particles upstream of the through hole 60. The right end of the pre-filter 81 extends into the first flow channel 21, but the pre-filter 81 does not completely block the first flow channel 21. That is, in addition to being able to flow through the filter to the reflux channel 3, some of the liquid in the first flow channel 21 can also flow up and down along the outer wall of the pre-filter 81. Figure 3 As shown, the diameter of the pre-filter 81 is smaller than the diameter of the reflux channel 3 in this section, thereby forming a gap between the pre-filter 81 and the valve body 10 for allowing liquid to pass through, that is, the liquid in the first flow channel 21 can flow along the outer wall of the pre-filter 81, thereby flushing the outer wall of the pre-filter 81 extending into the first flow channel 21, and washing away the sand and stone particles blocking the outer wall of the pre-filter 81, thereby achieving the self-cleaning effect of the pre-filter 81 and greatly improving the service life of the connecting valve 1.

[0044] Furthermore, a post-filter 82 is included. This post-filter 82 is positioned to the left of the first step 33 to provide a filtering effect downstream of the valve core 5. This post-filter 82 primarily serves to prevent sand and gravel particles from entering the valve core 5 through the return outlet 31, thereby reducing their impact on the valve core 5. However, the placement of the post-filter 82 is flexible, as illustrated below using two separate embodiments.

[0045] The first embodiment, such as Figure 2 and Figure 3 As shown, the post-filter 82 is installed in the reflux channel 3 , and the post-filter 82 is arranged on the left side of the valve core 5 and will not affect the movement of the valve core 5 .

[0046] The second embodiment, such as Figure 9 and Figure 10 As shown, the connecting valve 1 also includes a second flow channel 22 spaced apart and arranged on the left side of the first flow channel 21. The second flow channel 22 is connected to the left end of the reflux channel 3. The reflux outlet 31 is located at the intersection of the second flow channel 22 and the reflux channel 3. The post-filter 82 can be installed in the reflux channel 3 as in the first embodiment, or it can be completely installed in the second flow channel 22, or the right end can be connected to the reflux channel 3 and the left end can extend into the second flow channel 22. The second flow channel 22 is one of the channels for allowing the liquid medium to flow. The upper and lower ends of the second flow channel 22 are respectively provided with a second flow channel outlet 221 and a second flow channel inlet 222. The second flow channel outlet 221 is connected to a water terminal (such as a faucet), and the second flow channel inlet 222 is connected to a cold water pipe. In this way, cold water can flow to the water terminal through the second flow channel 22; or when the water terminal is closed and the through hole 60 is opened, the liquid in the first flow channel 21 can enter the second flow channel 22 through the reflux channel 3.

[0047] Furthermore, a left mounting port 11 is provided on the valve body 10, and the left mounting port 11 is connected to the second flow channel 22 and is coaxially arranged with the return channel 3, and the rear filter 82 is installed in the second flow channel 22 through the left mounting port 11, but does not completely block the second flow channel 22; it also includes a left cover plate 12, and the left cover plate 12 is sealed and connected to the left mounting port 11; the left cover plate 12 is provided with a plurality of left support rods 121 extending from left to right, and the left support rods 121 are pressed against the wall around the return outlet 31, and the rear filter 82 is connected to the left support rods 121 and arranged around the return outlet 31. Since the rear filter 82 does not completely block the second flow channel 22, water can carry away sand and stone particles blocking the outer surface of the rear filter 82 when flowing through the second flow channel 22. The rear filter 82 is not easy to be blocked, which further improves the service life of the connecting valve 1; and the detachable installation structure of the left cover 12 also facilitates the later maintenance of the connecting valve 1.

[0048] like Figure 2 、 Figure 3 and Figure 7 As shown, the valve core 5 is blocked to the right on the through hole 60 under the action of the valve core spring 4, and the partition 6 is sealed and connected to the second step 34. The through hole 60 becomes the channel through which the liquid flowing through the reflux channel 3 must pass. The valve core 5 includes a valve core body 51 and a valve core sealing ring 52 installed on the valve core 51 body. The valve core sealing ring 52 of the valve core 5 blocks the through hole 60 to form a one-way valve structure. When the pressure of the liquid on the right side of the partition 6 is greater than the sum of the pressure of the liquid on the left side and the force of the valve core spring 4, the valve core 5 opens, and the liquid on the right side of the partition 6 can pass through the through hole 60 to the left and flow toward the reflux outlet 31.

[0049] In order to ensure the installation and movement stability of the valve core 5, Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, it also includes a left guide part 36 arranged in the reflux channel 3 and a right guide part 62 arranged on the partition 6, the left guide part 36 includes a left guide ring 361 and a left connecting foot 362, the left connecting foot 362 is respectively connected to the left guide ring 361 and the first step 33, and the left guide ring 361 is provided with a left guide hole; the right guide part 62 includes a right guide ring 621 and a right connecting foot 622, the right connecting foot 622 is respectively connected to the right guide ring 621 and the partition 6, and the right guide ring 621 is provided with a right guide hole; the left and right ends of the valve core 5 are respectively provided with a left guide column 53 and a right guide column 54, the left guide column 53 is movably inserted in the left guide hole of the left guide ring 361, and the right guide column 54 is movably inserted in the right guide hole of the right guide ring 621.

[0050] Although the pre-filter 81 and the post-filter 82 can block some larger sand and stone particles, some fine sand and stone particles can still enter the installation area of the valve core 5. A number of toothed ribs 55 extending along the axial direction are evenly arranged on the side walls of the left guide column 53 and the right guide column 54. When viewed along the axial direction of the guide column, the cross-section of the toothed rib 55 is gear-shaped; the left guide column 53 and the right guide column 54 arranged in this way will form small cavities 56 and large cavities 57 arranged at intervals of different sizes when cooperating with the left guide ring 361 and the right guide ring 621. When fine sand and stone particles are stuck in the small cavity 56, due to the small and unstable contact area between the toothed rib 55 and the fine sand and stone particles, the fine sand and stone particles will slide into the large cavity 57 and be washed away. This structure not only ensures a cooperating structure with a small gap between the guide column and the ring hole, but also reduces the possibility of the guide column being stuck, thereby greatly improving the stability of the valve core 5.

[0051] A further technical solution may also be: Figure 10As shown, the second flow channel 22 located on both sides of the reflux outlet 31 is respectively composed of a second flow channel water inlet section 223 and a second flow channel water outlet section 224, wherein the minimum water flow cross-sectional area of the second flow channel water outlet section 224 is A1. A limiting plate 23 is provided in the second flow channel water outlet section 224, and the limiting plate 23 is provided with at least one flow limiting hole 230. The sum of the water flow cross-sectional areas of the flow limiting holes 230 is A2, wherein A2:A1=0.04~0.25. The flow limiting hole 230 can be provided singly or in plurality. When multiple flow limiting holes 230 are provided, the water flow cross-sectional area of the flow limiting hole 230 is the sum of the water flow cross-sectional areas of all flow limiting holes 230. When the second flow channel 22 is used alone for water supply, the overall flow rate of the water in the second flow channel 22 is fast, the overall pressure in the flow channel becomes small, thereby forming a pressure difference with the water pressure in the first flow channel 21. This pressure difference may cause the valve core 5 to open. In order to solve this problem, the limiting plate 23 is set in the water outlet section 224 of the second flow channel. On the premise of meeting the water output, the flow rate of water is increased only when it passes through the limiting hole 230, while the flow rate upstream of the limiting plate 23 (that is, the water inlet section 223 of the second flow channel and a section of the second flow channel 22 next to the reflux outlet 31) is reduced. According to Bernoulli's principle, the pressure drop value upstream of the limiting plate 23 becomes relatively small, so the pressure difference between it and the water pressure in the first flow channel 21 is also relatively small, which greatly reduces the probability of the valve core 5 opening, that is, reduces the problem of water cross-flow between the first flow channel 21 and the second flow channel 22 during abnormal reflux.

[0052] A further technical solution may also be: Figures 6-10 As shown, the outer circumference of the partition 6 is provided with at least one ring of ribs 63. The maximum outer diameter of the ribs 63 is not less than the inner diameter of the second step 34. When the partition 6 is connected to the second step 34, the ribs 63 form a sealed connection with the second step 34. Preferably, the maximum outer diameter of the ribs 63 is approximately 0.2 mm to 2 mm larger than the inner diameter of the second step 34. The ribs 63 have a certain elasticity. When the partition 6 is installed on the second step 34, the ribs 63 are squeezed and overturned toward the right mounting opening 32. In this way, the ribs 63 not only press against the second step 34 under their own elastic force, but also clamp against the second step 34 to prevent the partition 6 from falling out toward the right mounting opening 32.

[0053] Since the connecting valve 1 has the above advantages, it can be applied to a water supply system. Common water supply systems are divided into a water supply system without a return pipe and a water supply system with a return pipe, which are described below respectively.

[0054] The first is a water supply system without return pipes, such as Figure 11As shown, it includes a heating device 91, a water outlet terminal 92 (faucet) and the connecting valve 1. The heating device 91 is provided with a water inlet 911, a water outlet 912 and a circulating pump (not shown in the figure). The water outlet terminal 92 is provided with a terminal cold water inlet 921 and a terminal hot water inlet 922. The valve body 10 of the connecting valve 1 is provided with a first flow channel inlet 212 and a first flow channel outlet 211 communicating with the first flow channel 21; it also includes a first cold water pipe 93, a second cold water pipe 94, a third cold water pipe 95, a first hot water pipe 96, a second hot water pipe 97 and a three-way valve 98. The three-way valve 98 includes a first valve port 981, a second valve port 982 and a third valve port 983, wherein the first The cold water pipe 93 is connected to the water inlet 911 of the heating device 91, the second cold water pipe 94 is connected to the first valve port 981 of the three-way valve 98, the two ends of the third cold water pipe 95 are respectively connected to the second valve port 982 of the three-way valve 98 and the terminal cold water inlet 921 of the water outlet terminal 92, the two ends of the first hot water pipe 96 are respectively connected to the water outlet 912 of the heating device 91 and the first flow channel inlet 212 of the connecting valve 1, the two ends of the second hot water pipe 97 are respectively connected to the first flow channel outlet 211 of the connecting valve 1 and the terminal hot water inlet 922 of the terminal, and the third valve port 983 of the three-way valve 98 is connected to the reflux outlet 31 of the connecting valve 1. The following is a detailed description of the reflux heating process. When the water outlet terminal 92 is closed, the circulation pump is started, and hot water is output from the water outlet 912 of the heating device 91. The water pressure in the first flow channel increases, thereby pushing open the valve core 5. The hot water flows into the first flow channel 21 through the first hot water pipe 96, and then enters the second cold water pipe 94 through the reflux channel 3 and the three-way valve 98, and then flows back to the heating device 91 through the first cold water pipe 93 and the cold water inlet 921. This cycle can replace the cold water in the first hot water pipe 96 with hot water. At this time, opening the water outlet terminal 92 can achieve zero waiting time for hot water output.

[0055] The second type is a water supply system with a return pipe, such as Figure 12As shown, it includes a heating device 91, a water outlet terminal 92 and the connecting valve 1, the heating device 91 is provided with a water inlet 911, a water outlet 912 and a circulating pump (not shown in the figure), the water outlet terminal 92 is provided with a terminal cold water inlet 921 and a terminal hot water inlet 922, and the valve body 10 of the connecting valve 1 is also provided with a first flow channel inlet 212 and a first flow channel outlet 211 connected to the first flow channel 21; it also includes a first cold water pipe 93, a second cold water pipe 94, a first hot water pipe 96, a second hot water pipe 97, a three-way valve 98 and a return pipe 99, the three-way valve 98 includes a first valve port 981, a second valve port 982 and a third valve port 983, wherein the three The first valve port 981 of the three-way valve 98 is connected to the water inlet 911 of the heating device 91, the first cold water pipe 93 is connected to the second valve port 982 of the three-way valve 98, the second cold water pipe 94 is connected to the terminal cold water inlet 921 of the water outlet terminal 92, the two ends of the first hot water pipe 96 are respectively connected to the water outlet 912 of the heating device 91 and the first flow channel inlet 212 of the connecting valve 1, the two ends of the second hot water pipe 97 are respectively connected to the first flow channel outlet 211 of the connecting valve 1 and the terminal hot water inlet 922 of the terminal, and the two ends of the return pipe 99 are respectively connected to the return outlet 31 of the connecting valve 1 and the third valve port 983 of the three-way valve 98. Compared with the above water supply system solution, the hot water in this solution flows back to the heating device 91 through the return pipe 99, and will not heat the cold water in the second cold water pipe 94. Both cold water and hot water can achieve the effect of zero waiting time for water discharge.

Claims

1. A connecting valve, comprising a valve body, wherein a first flow channel arranged vertically and a return channel passing through the first flow channel on the left and right sides are provided in the valve body; characterized in that: The return channel is provided with a return outlet at its left end and a right mounting port at its right end. The return channel further includes a valve core spring, a valve core, a partition plate, and a right cover plate, which can be installed in the return channel through the right mounting port. The return channel is formed with at least three steps, namely, a first step, a second step, and a third step, whose diameters gradually increase from left to right. The return outlet is located on the left side of the first step, the first step is located on the left side of the first flow channel, the second step is located between the first step and the first flow channel, and the third step is located on the right side of the first flow channel. The valve core spring and the valve core are disposed between the first and second steps, the partition plate is sealingly connected to the second step, and a through hole is further provided on the partition plate. Both ends of the valve core spring are respectively connected to the first step and the valve core. The valve core is blocked to the right of the through hole by the valve core spring. The right cover plate is detachably and sealingly connected to the third step. The return channel further includes a pre-filter screen connected to the right side of the partition plate, the right end of the pre-filter screen extending into the first flow channel. It also includes a post-filter, which is arranged on the left side of the first step to form a filtering effect downstream of the valve core; The system further includes a second flow channel spaced apart and arranged on the left side of the first flow channel, the second flow channel being connected to the left end of the return channel, the return outlet being located at the intersection of the second flow channel and the return channel, and the post-filter being disposed in the return channel and / or the second flow channel; The valve body is further provided with a left mounting port, the left mounting port being connected to the second flow channel and being coaxially arranged with the return channel. The post-filter is mounted in the second flow channel through the left mounting port but does not completely block the second flow channel. The second flow channels located on both sides of the reflux outlet are respectively the second flow channel water inlet section and the second flow channel water outlet section, wherein the minimum water flow cross-sectional area of the second flow channel water outlet section is A1, and a limiting flow plate is provided in the second flow channel water outlet section, and at least one flow limiting hole is provided on the limiting flow plate, and the sum of the water flow cross-sectional areas of the flow limiting holes is A2, wherein A2:A1=0.04~0.

25.

2. The connecting valve according to claim 1, characterized in that: It also includes a left cover plate, which is sealed and connected to the left installation port, and the rear filter is arranged on the left cover plate.

3. The connecting valve according to claim 2, characterized in that The left cover plate and the right cover plate are provided with a plurality of left support rods and right support rods extending in the left and right directions, wherein the left support rod presses against the wall around the reflux outlet, and the right support rod presses against the right side of the partition, the front filter is connected to the right support rod and arranged around the through hole, and the rear filter is connected to the left support rod and arranged around the reflux outlet.

4. The connecting valve according to any one of claims 1 to 3, characterized in that: At least one circle of ribs is provided on the outer circumference of the partition, and the maximum outer diameter of the ribs is not less than the inner diameter of the second step. When the partition is connected to the second step, the ribs form a sealed connection with the second step.

5. The connecting valve according to any one of claims 1 to 3, characterized in that: It also includes a left guide part and a right guide part arranged in the reflux channel, the left guide part includes a left guide ring and a left connecting foot, the left connecting foot is respectively connected to the left guide ring and the first step, the right guide part includes a right guide ring and a right connecting foot, the right connecting foot is respectively connected to the right guide ring and the partition; the left and right ends of the valve core are respectively provided with a left guide column and a right guide column, the left guide column is movably inserted in the left guide ring, and the right guide column is movably inserted in the right guide ring.

6. The connecting valve according to claim 5, characterized in that A plurality of tooth-shaped ribs extending along the axial direction are evenly arranged on the side walls of the left guide column and the right guide column. When viewed along the axial direction of the left guide column or the right guide column, the cross-section of the tooth-shaped ribs is gear-shaped.

7. Water supply system, characterized in that, It includes a heating device, a water outlet terminal and a connecting valve according to any one of claims 1 to 6, wherein the heating device is provided with a water inlet, a water outlet and a circulating pump, the water outlet terminal is provided with a terminal cold water inlet and a terminal hot water inlet, and the valve body of the connecting valve is also provided with a first flow channel inlet and a first flow channel outlet communicating with the first flow channel; it also includes a first cold water pipe, a second cold water pipe, a third cold water pipe, a first hot water pipe, a second hot water pipe and a three-way valve, the three-way valve includes a first valve port, a second valve port and a third valve port, wherein the first cold water pipe is connected to the water inlet of the heating device, the second cold water pipe is connected to the first valve port of the three-way valve, the two ends of the third cold water pipe are respectively connected to the second valve port of the three-way valve and the terminal cold water inlet of the water outlet terminal, the two ends of the first hot water pipe are respectively connected to the water outlet of the heating device and the first flow channel inlet of the connecting valve, the two ends of the second hot water pipe are respectively connected to the first flow channel outlet of the connecting valve and the terminal hot water inlet of the terminal, and the third valve port of the three-way valve is connected to the reflux outlet of the connecting valve.

8. Water supply system, characterized in that, It includes a heating device, a water outlet terminal and a connecting valve according to any one of claims 1 to 6, wherein the heating device is provided with a water inlet, a water outlet and a circulating pump, the water outlet terminal is provided with a terminal cold water inlet and a terminal hot water inlet, and the valve body of the connecting valve is also provided with a first flow channel inlet and a first flow channel outlet connected to the first flow channel; it also includes a first cold water pipe, a second cold water pipe, a first hot water pipe, a second hot water pipe, a return pipe and a three-way valve, the three-way valve includes a first valve port, a second valve port and a third valve port, wherein the first valve port of the three-way valve is connected to the water inlet of the heating device, the first cold water pipe is connected to the second valve port of the three-way valve, the second cold water pipe is connected to the terminal cold water inlet of the water outlet terminal, the two ends of the first hot water pipe are respectively connected to the water outlet of the heating device and the first flow channel inlet of the connecting valve, the two ends of the second hot water pipe are respectively connected to the first flow channel outlet of the connecting valve and the terminal hot water inlet of the terminal, and the two ends of the return pipe are respectively connected to the return outlet of the connecting valve and the third valve port of the three-way valve.

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