Three-way valve and gas-fired boiler adopting same
By setting a retractable shaft sleeve in the three-way valve, the water leakage caused by impurities in the heating water of the gas boiler is solved, and effective water sealing and equipment life are achieved.
Patent Information
- Application Number
- CN202421337245.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In the long-term use of existing household gas boilers, impurities such as rust will be mixed into the heating water, causing the valve shaft of the three-way valve to wear and damage the sealing ring, which will cause water leakage.
A three-way valve is designed, which prevents heating water from contacting the covered part of the valve shaft during the movement of the valve shaft by providing a retractable shaft sleeve during the valve shaft, preventing impurities from adhering, thereby preventing water leakage.
It effectively prevents heating water from leaking through the three-way valve, avoids the problem of insufficient water pressure, and extends the service life of the equipment.
Smart Images
Figure CN222458450U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a three-way valve applicable to a gas boiler, and in particular to a valve shaft waterproof mechanism of the three-way valve.
[0002] The present disclosure also relates to a gas boiler using the three-way valve. Background Art
[0003] Domestic gas boilers can be used to provide domestic hot water, and can also be connected to heating pipelines installed indoors (such as radiators or floor heating pipelines) to provide central heating functions. A burner, a main heat exchanger, a piping system, and a water circuit assembly are usually provided therein. The water circuit assembly is usually installed on the bottom plate of the gas boiler, and includes components such as a circulating pump, a three-way valve, and an auxiliary heat exchanger, which are respectively connected to the heating return water inlet, the heating water outlet, the bathroom water inlet, and the bathroom water outlet. The three-way valve is usually used to selectively connect the main heat exchanger to the external heating pipeline water flow, or to the auxiliary heat exchanger water flow to heat domestic / bathroom water. However, in the long-term use of existing domestic gas boilers, impurities will be mixed into the heating water. For example, the inner wall of the radiator is rusted due to inadequate processing or the solder is not cleaned up, so rust will be mixed into the heating water. When heating water flows through the three-way valve, the mixed rust will adhere to the valve shaft, and as the valve shaft moves, it will wear the sealing ring on the valve shaft, which will cause the seal to fail and leak. Heating water may flow out of the gas boiler and damage the decoration of the user's home. In addition, excessive heating water outflow will also lead to insufficient water pressure and affect the normal use of the equipment. Utility Model Content
[0004] In order to overcome the problems existing in the related art, the present disclosure provides a three-way valve and a gas boiler using the three-way valve.
[0005] A first aspect of an embodiment of the present disclosure provides a three-way valve, which includes a valve body, a valve shaft, a closure member, and a sleeve. The valve body extends longitudinally, and has a first cavity formed therein, and a water hole connected to the first cavity for water to flow through; an end wall is formed at one longitudinal end of the first cavity, and a water outlet is formed at the other longitudinal end of the first cavity for water to flow through. The valve shaft passes through the end wall and the first cavity in the longitudinal direction, and partially protrudes out of the above-mentioned water outlet. The closure member is fixedly disposed on the portion of the valve shaft that protrudes out of the first cavity, and can move with the valve shaft to selectively close the above-mentioned water outlet. The sleeve includes a first end and a second end opposite to each other, and a telescopic portion with a variable length located between the first and second ends; the above-mentioned first end is disposed adjacent to the closure member and is relatively fixedly matched with the valve shaft, and the above-mentioned second end is relatively fixedly matched with the end wall.
[0006] In some embodiments, the end wall has a first boss that integrally protrudes into the first cavity, and a first channel is provided in the first boss for the valve shaft to extend through. The first end of the sleeve covers the valve shaft and has an interference fit with the valve shaft; the second end of the sleeve covers the outer wall of the first boss and has an interference fit with the first boss.
[0007] In some embodiments, the telescopic portion of the sleeve has a wave-shaped configuration.
[0008] In some embodiments, at least the telescopic portion of the sleeve is made of hydrogenated nitrile rubber.
[0009] In some embodiments, a second cavity adjacent to the first cavity and separated by the end wall is further formed in the valve body, and the valve shaft extends into the second cavity.
[0010] In some embodiments, the end wall has a second boss integrally extending into the second cavity, a second passage for the valve shaft to extend through is provided in the second boss, and a sealing ring sleeved on the valve shaft is provided in the second passage.
[0011] In some embodiments, the three-way valve further includes an electric drive device, which is disposed on the valve body and cooperates with the portion of the valve shaft located in the second cavity to drive the valve shaft to move longitudinally.
[0012] The second aspect of the disclosed embodiment provides a gas boiler, which includes a burner, a main heat exchanger, an auxiliary heat exchanger, a circulating pump, a heating return water inlet, a heating water outlet, a bathroom water inlet, and a bathroom water outlet. The gas boiler also has a heating water circuit, a bathroom water circuit, a circulating water circuit, and the above-mentioned three-way valve. The heating water circuit flows from the heating return water inlet through the circulating pump and the main heat exchanger to the heating water outlet. The bathroom water circuit flows from the bathroom water inlet through the auxiliary heat exchanger to the bathroom water outlet. The circulating water circuit flows through the circulating pump, the main heat exchanger, the auxiliary heat exchanger in sequence, and returns to the circulating pump. The above-mentioned three-way valve is arranged in the heating water circuit and the circulating water circuit to connect the heating water circuit and the circulating water circuit with a water flow that can be selected.
[0013] In some embodiments, the three-way valve is arranged adjacent to the heating return water inlet.
[0014] In some embodiments, the closure member of the three-way valve has a first position and a second position. When the closure member is in the first position, the length of the telescopic portion of the sleeve is the longest, the closure member closes the port connected to the auxiliary heat exchanger, and the water outlet of the first cavity of the three-way valve is opened, so that the heating return water port is connected to the water path between the circulation pump through the water hole and the water outlet of the three-way valve. When the closure member is in the second position, the length of the telescopic portion of the sleeve is the shortest, the water outlet of the first cavity of the three-way valve is closed by the closure member, and the port connected to the auxiliary heat exchanger is opened, so that the water path between the auxiliary heat exchanger and the circulation pump is connected through the port.
[0015] The technical solution provided by one or more embodiments of the present disclosure may include the following beneficial effects: by arranging a retractable sleeve in the first cavity of the three-way valve, the heating water can be effectively prevented from contacting the part of the valve shaft covered by the sleeve even during the movement of the valve shaft, while also preventing impurities in the heating water from adhering to the valve shaft, thereby preventing the heating water from leaking through the three-way valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 is a three-dimensional schematic diagram of a gas boiler in one embodiment of the present disclosure, wherein a portion of the outer shell is removed to show a water channel module disposed in the gas boiler;
[0018] Figure 2 yes Figure 1 A three-dimensional schematic diagram of a water circuit module in a gas boiler is shown;
[0019] Figure 3 yes Figure 2 A schematic plan view of a three-way valve in a waterway module is shown;
[0020] Figure 4 yes Figure 3 A schematic cross-sectional view of a three-way valve is shown;
[0021] Figure 5 yes Figure 2 The schematic cross-sectional view of the waterway module shown is along the vertical direction, wherein the closing member of the three-way valve is in the first position;
[0022] Figure 6 and Figure 5 Similarly, wherein the closure member of the three-way valve is in the second position;
[0023] Figure 7 yes Figure 1 The working principle schematic block diagram of the gas boiler is shown. DETAILED DESCRIPTION
[0024] The following will describe the various embodiments shown in detail in conjunction with the accompanying drawings. However, these embodiments do not represent all embodiments consistent with the present disclosure, and any structural, methodological, or functional changes made by a person of ordinary skill in the art based on these implementations are all included in the protection scope requested by the attached claims.
[0025] Gas boilers use combustible gas as fuel, such as natural gas, city gas, liquefied gas, biogas, etc., and heat water by burning combustible gas to meet the user's central heating and / or domestic water needs. Figure 1 and Figure 7 A specific embodiment of the gas boiler of the present disclosure is shown. The gas boiler 100 comprises a shell 10, a burner 11, a main heat exchanger 12, a smoke exhaust device 13, and a water channel module etc. housed in the shell 10.
[0026] In this embodiment, the housing 10 is roughly in the shape of a rectangular parallelepiped, and can be formed by splicing a number of panels, such as a front panel, a back panel, a top panel, a bottom panel, and a pair of side panels. The housing 10 can be mounted on a wall with its back panel facing the wall. The burner 11 can be an atmospheric burner, which usually includes a burner unit, such as a number of fire row pieces (not shown) arranged side by side. A gas-air mixing channel is provided on each fire row piece, and the gas and primary air transported by the gas transmission pipeline are mixed in the mixing channel and transferred to the fire holes located at the top of the fire row piece to burn and generate hot smoke. Since the structure and arrangement of the fire row piece are well known to those skilled in the art, the applicant will not repeat them here. The main heat exchanger 12 is usually arranged above the burner 11, and it can adopt a fin-tube heat exchanger, that is, a plurality of fins are arranged in the heat exchanger shell, and a hot water absorption pipe (not shown) passes through these fins in a circuitous manner. The heat carried by the hot flue gas generated by the burner 11 is absorbed by the fins and further transferred to the water flowing through the heat absorbing water pipe, and the heated water is output through the corresponding pipeline. The smoke exhaust device 13 is usually installed on the main heat exchanger 12, which includes a smoke hood and a smoke exhaust pipe arranged on the top of the smoke hood. The smoke generated by the combustion (including waste gas such as carbon monoxide and nitrogen oxides) will be collected by the smoke hood and discharged to the outside through the smoke exhaust pipe.
[0027] Mate Reference Figure 2 As shown, the water circuit module is usually installed on the bottom plate of the shell, and includes a heating return water pipeline and a heating outlet water pipeline extending out of the bottom plate of the shell 10. Among them, a heating return water port 21 is formed at the end of the heating return water pipeline, and a heating outlet water port 24 is formed at the end of the heating outlet water pipeline. The heating return water port 21 and the heating outlet water port 24 can be connected to an external radiator or a floor heating pipeline (not shown) through a pipe to form a heating circuit. The water circuit module also includes a bathroom water inlet 22 and a bathroom water outlet 12 protruding from the bottom plate of the shell 10, so as to be connected to an external water point, such as a mixing valve, through a pipe. The water circuit module also includes a circulating pump 30, a three-way valve 40, and an auxiliary heat exchanger 50. The auxiliary heat exchanger 50 can adopt a traditional plate heat exchanger. It is well known to those skilled in the art that a plate heat exchanger is made of many corrugated metal sheets stacked at certain intervals, with flow channels formed between the sheets. Cold and hot fluids flow through the channels on both sides of the same sheet, respectively, to perform heat exchange through the sheets.
[0028] Mate Reference Figure 7 As shown, the water system in the housing 10 includes a heating water circuit, a bathroom water circuit, and a circulating water circuit. Among them, the heating water circuit is from the heating return water port 21, flows through the circulation pump 30 and the main heat exchanger 12, to the heating water outlet 24; the bathroom water circuit is from the bathroom water inlet 22, flows through the auxiliary heat exchanger 50, to the bathroom water outlet 23; the circulating water circuit is to flow through the circulation pump 30, the main heat exchanger 12, the auxiliary heat exchanger 50 in sequence, and return to the circulation pump 30. In this embodiment, the auxiliary heat exchanger 201 is connected to the bathroom water circuit and the circulating water circuit, so as to realize heat exchange between the two water circuits. The three-way valve 40 is set in the heating water circuit and the circulating water circuit, so that the heating water circuit and the circulating water circuit can be connected by water flow in one place. The three-way valve 40 can be set on the water inlet side or the water outlet side, depending on the spatial arrangement inside the equipment. In this embodiment, the three-way valve 40 is arranged on the water inlet side, that is, adjacent to the heating return water inlet 21 or the bathroom water inlet 22. When the gas boiler 100 operates in the heating mode, the three-way valve 40 is actuated to connect the water path from the heating return water inlet 21 to the circulation pump 30 through the three-way valve 40. At the same time, the water path between the auxiliary heat exchanger 50 and the three-way valve 40 is disconnected, so that the heating water flows through the heating water path, is heated by the main heat exchanger 12, and then is output for room heating. When the gas boiler 100 operates in the bathroom mode, the three-way valve 40 is actuated to disconnect the water path from the heating return water inlet 21 to the circulation pump 30 through the three-way valve 40. At the same time, the water path between the auxiliary heat exchanger 50 and the three-way valve 40 is connected, so that the water in the circulation water path is heated by the main heat exchanger 12, and the heat is transferred to the domestic water passing through the bathroom water path through the auxiliary heat exchanger 50. Subsequently, the domestic water is heated and output for bathing and other domestic purposes.
[0029] Reference Figure 3 and Figure 4As shown, the three-way valve 40 includes a valve body 42 and a valve shaft 43 accommodated in the valve body 42. The valve body 42 extends in the longitudinal direction, and includes a first cavity 424 and a second cavity 425 distributed in the longitudinal direction, and an end wall 421 formed between the first and second cavities 424, 425 to separate the two. The valve body 42 is also formed with a water hole 426 that is connected to the first cavity 424 for water to flow through. A water outlet 427 for water to flow through is formed at one longitudinal end of the first cavity 424 opposite to the end wall 421. The valve shaft 43 passes through the end wall 421 and the first cavity 424 from the second cavity 425 in the longitudinal direction, and partially protrudes out of the above-mentioned water outlet 427. In some embodiments, the three-way valve 40 further includes an electric drive device 41, such as a stepper motor, which is disposed on the valve body and has a motor shaft 411 extending into the second cavity 425, and the motor shaft 411 cooperates with the portion of the valve shaft 43 located in the second cavity 425 to drive the valve shaft 43 to move longitudinally. The three-way valve 40 further includes a closing member 44, which is fixedly disposed on the portion of the valve shaft 43 protruding out of the first cavity 424 and can move with the valve shaft 43 to selectively close the water outlet 427.
[0030] The three-way valve 40 further includes a sleeve 45, which includes a first end 451 and a second end 452 opposite to each other, and a telescopic portion 453 with a variable length located between the first and second ends. The first end 451 is disposed adjacent to the closure member 44. In some embodiments, the first end 451 may abut against one longitudinal end of the closure member 44. The first end 451 is relatively fixedly matched with the valve shaft 43, while the second end 452 is relatively fixedly matched with the end wall 421. The first end 451 and the valve shaft 43 are relatively fixedly matched by, for example, wrapping the first end 451 on the valve shaft 43 and having an interference fit with the valve shaft 43, so that the first end 451 of the sleeve is reliably fixed on the valve shaft. The second end 452 and the end wall 421 are relatively fixedly matched by, for example, directly fixing the second end 452 on the end wall 421 by conventional fixing methods such as glue. In some embodiments, the end wall 421 has a first boss 422 that integrally protrudes into the first cavity 424, and the first boss 422 is provided with a first channel for the valve shaft 43 to extend through; the second end 452 of the sleeve covers the outer wall of the above-mentioned first boss 422 and has an interference fit with the first boss 422, so that the second end 452 of the sleeve and the end wall 421 are reliably fixed relative to each other.
[0031] In some embodiments, the telescopic portion 453 of the sleeve is in a wavy structure, and through this structure, the length of the telescopic portion 453 is variable, that is, it can be stretched or compressed. In some embodiments, at least the telescopic portion of the sleeve can be made of an elastic material, so that the telescopic portion can be stretched or compressed without adopting the above-mentioned wavy structure. In some embodiments, the telescopic portion 453 of the sleeve can be made of an elastic material and at the same time in a wavy structure, so that the telescopic direction of the sleeve can be limited, and the sleeve can be prevented from cracking or falling off after the valve shaft moves for a long time, thereby increasing the life of the sleeve. The elastic material can be various polymer rubbers. In some embodiments, the elastic material can be selected from hydrogenated nitrile rubber (HNBR), which has a high resistance to permanent compression deformation, thereby further extending the life of the sleeve. In some embodiments, the first and second ends 451, 452 of the sleeve are also made of elastic material, which can not only ensure the fixing effect of the first and second ends 451, 452, but also improve its sealing effect. The end wall 451 has a second boss 423 integrally protruding into the second cavity 425, and a second channel for the valve shaft 43 to extend through is provided in the second boss 423, and a sealing ring 461 sleeved on the valve shaft 43 is provided in the second channel. In some embodiments, there are two sealing rings 461, which are spaced apart in the longitudinal direction, and a sleeve 462 is provided between the two to space the two, thereby achieving double sealing to improve the sealing effect.
[0032] By providing a retractable sleeve 45 in the first cavity 424 of the three-way valve 40, the heating water can be effectively prevented from contacting the portion of the valve shaft 43 covered by the sleeve 45 even during the movement of the valve shaft 43, and impurities in the heating water can be prevented from being attached to the valve shaft, thereby preventing the heating water from leaking through the three-way valve. In addition, in some embodiments, a sealing ring sleeved on the valve shaft 43 is provided in the second cavity 425 of the three-way valve, so that even if a small amount of water vapor enters through the sleeve 45, large particles of impurities are still blocked outside, so the sealing ring can further prevent water vapor from entering the second cavity 425 to further prevent the leakage of heating water. At the same time, since the impurities cannot contact the sealing ring, the sealing ring will not be worn and fail.
[0033] Mate Reference Figure 5 and Figure 6 As shown, the closing member 44 of the three-way valve 40 has a first position and a second position to correspond to the heating mode and the bathroom mode of the gas boiler respectively. Figure 5As shown, when the closing member 44 is in the first position, the telescopic portion 453 of the sleeve 45 is the longest, the closing member 44 closes the port 27 connected to the auxiliary heat exchanger, and the water port 427 of the first cavity of the three-way valve is opened, so that the heating return water port 21 is connected to the water path between the circulation pump 30 through the water hole 45 of the three-way valve 40 and the water port 427, thereby making the heating water path connected. Figure 6 As shown, when the closure member 44 is in the second position, the telescopic portion 453 of the sleeve 45 is the shortest, the water outlet 427 of the first cavity of the three-way valve is closed by the closure member 44, and the port 27 connected to the auxiliary heat exchanger is opened, so that the auxiliary heat exchanger is connected to the water path between the circulating pump 30 through the port 27, thereby connecting the circulating water path.
[0034] In the description of the above-mentioned embodiments in the present disclosure, the orientations or positional relationships indicated by "longitudinal", "lateral", "vertical", "radial", "circumferential", "horizontal", "length", "width", "thickness", "up", "down", "left", "right", "front", "rear", etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.
[0035] In the above disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "second", etc. can explicitly or implicitly include at least one of the features. In the above description, the meaning of "several", "multiple", and other similar terms is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0036] In the above disclosure, unless otherwise clearly specified and limited, the terms "installed", "adjacent", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0037] In the above disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above", "above", or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below", or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0038] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A three-way valve, characterized in that: The three-way valve includes The valve body extends in the longitudinal direction and has a first cavity formed therein and a water through hole connected to the first cavity for water to flow through; an end wall is formed at one longitudinal end of the first cavity, and a water through hole is formed at the other longitudinal end for water to flow through; A valve shaft passes through the end wall and the first cavity in the longitudinal direction and partially protrudes out of the water outlet; A closing member, fixedly arranged on the portion of the valve shaft protruding out of the first cavity, and capable of moving with the valve shaft to selectively close the water outlet; The shaft sleeve comprises a first end and a second end opposite to each other, and a telescopic portion with variable length located between the first and second ends; the first end is arranged adjacent to the closure member and fixedly matched with the valve shaft, and the second end is fixedly matched with the end wall.
2. The three-way valve according to claim 1, characterized in that: The end wall has a first boss that integrally protrudes into the first cavity, and the first boss is provided with a first channel for the valve shaft to extend through; the first end of the sleeve is covered on the valve shaft and has an interference fit with the valve shaft, and the second end of the sleeve is covered on the outer wall of the first boss and has an interference fit with the first boss.
3. The three-way valve according to claim 1, characterized in that: The telescopic portion of the shaft sleeve is in a wave-shaped structure.
4. The three-way valve according to claim 1, characterized in that: At least the expansion part of the shaft sleeve is made of hydrogenated nitrile rubber.
5. The three-way valve according to claim 1, characterized in that: A second cavity adjacent to the first cavity and separated by the end wall is formed in the valve body, and the valve shaft extends into the second cavity.
6. The three-way valve according to claim 5, characterized in that: The end wall has a second boss integrally extending into the second cavity, a second passage for the valve shaft to extend through is arranged in the second boss, and a sealing ring sleeved on the valve shaft is arranged in the second passage.
7. The three-way valve according to claim 5, characterized in that: The three-way valve also includes an electric drive device, which is arranged on the valve body and cooperates with the portion of the valve shaft located in the second cavity to drive the valve shaft to move longitudinally.
8. A gas boiler, characterized in that: The gas boiler includes: Burner, main heat exchanger, auxiliary heat exchanger, circulation pump, heating water return port, heating water outlet, bathroom water inlet, bathroom water outlet; The heating water circuit flows from the heating return water outlet, through the circulation pump and the main heat exchanger, to the heating water outlet; The bathroom water path flows from the bathroom water inlet, through the auxiliary heat exchanger, to the bathroom water outlet; The circulating water circuit flows through the circulating pump, the main heat exchanger, the auxiliary heat exchanger in sequence, and returns to the circulating pump; The three-way valve as described in any one of claims 1 to 7 is arranged in the heating water circuit and the circulating water circuit to connect the heating water circuit and the circulating water circuit with a selectable water flow.
9. The gas boiler according to claim 8, characterized in that: The three-way valve is arranged adjacent to the heating water return port.
10. The gas boiler according to claim 8 or 9, characterized in that: The closing piece of the three-way valve has a first position and a second position; when the closing piece is in the first position, the length of the telescopic portion of the sleeve is the longest, the closing piece closes the port connected to the auxiliary heat exchanger, and the water outlet of the first cavity of the three-way valve is opened, so that the heating return water port is connected with the water path between the circulation pump through the water hole and the water outlet of the three-way valve; when the closing piece is in the second position, the length of the telescopic portion of the sleeve is the shortest, the water outlet of the first cavity of the three-way valve is closed by the closing piece, and the port connected to the auxiliary heat exchanger is opened, so that the auxiliary heat exchanger is connected with the water path between the circulation pump through the port.