Intelligent thermostatic valve for water heaters

Abstract

The utility model belongs to valve technical field, especially hot water heater's intelligent thermostatic valve, including valve body and controller, the hot water inlet channel, the water mixing cavity and the cold water inlet channel are sequentially equipped from left to right in the valve body, the hot water inlet channel links hot water heater outlet pipe, the water mixing cavity is connected through hot water mouth between the hot water inlet channel, and is connected through cold water mouth between the cold water inlet channel, the valve body is equipped with the valve rod that moves along the transverse by the power device drive in it, the valve rod left end is equipped with adjusting block no.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically referring to an intelligent thermostatic valve for water heaters. Background Technology

[0002] The temperature control of current water heaters is set at the water inlet, depending on the amount of cold water entering the system. This regulates the amount of gas entering the combustion chamber, thereby achieving automatic temperature control in the water heater. This type of pre-heating... The drawback of end-point temperature control is that it can cause problems when there is a water outage at the water heater's output or when the tap water supply is interrupted. When pressure fluctuations cause sudden temperature changes, the front-end temperature control method cannot adjust the back-end water output in a timely and rapid manner. Temperature, specifically, the water output at the downstream end still exhibits phenomena such as temperature fluctuations during water outages and sudden changes in temperature. Utility Model Content

[0003] The purpose of this invention is to provide an intelligent thermostatic valve for water heaters, which can adjust the outlet water temperature in a timely manner and effectively avoid the phenomenon of sudden temperature rise during water outages and sudden changes in temperature.

[0004] This utility model is implemented as follows: The intelligent thermostatic valve for a water heater includes a valve body and a controller. The valve body contains, from left to right, a hot water inlet channel, a mixing chamber, and a cold water inlet channel. The hot water inlet channel connects to the water heater's outlet pipe. The mixing chamber is connected to the hot water inlet channel via a hot water outlet and to the cold water inlet channel via a cold water outlet. The valve body contains a valve stem driven by a power device to move laterally. The left end of the valve stem has two adjusting blocks for regulating the flow rate of the hot water inlet channel, with the second adjusting block located to the right of the first adjusting block. A plug for sealing the cold water outlet is slidably fitted onto the valve stem. The valve body also contains an elastic element that allows the plug to return to its original position to the left and an outlet channel connected to the mixing chamber. A temperature sensor on the valve body detects the water temperature in the outlet channel. The controller controls the power device to drive the valve stem to move laterally based on the information transmitted by the temperature sensor.

[0005] In the aforementioned intelligent thermostatic valve for water heaters, the right end of the first adjusting block is a frustum shape with a diameter that gradually decreases from left to right, and the left end of the second adjusting block is a frustum shape with a diameter that gradually increases from left to right.

[0006] In the aforementioned intelligent thermostatic valve for water heaters, the left end of the first adjusting block is a frustum shape with a diameter that gradually increases from left to right, and the right end of the second adjusting block is a frustum shape with a diameter that gradually decreases from left to right.

[0007] In the aforementioned intelligent thermostatic valve for water heaters, the regulating block one and regulating block two are integrally formed with the valve stem.

[0008] In the aforementioned intelligent thermostatic valve for water heaters, the distance between the right end face of adjustment block one and the left end face of adjustment block two is greater than the width of the hot water inlet.

[0009] In the aforementioned intelligent thermostatic valve for water heaters, the valve stem is stepped, comprising a large cylindrical section and a small cylindrical section located to the right of the large cylindrical section. The plug is slidably fitted onto the small cylindrical section. The plug is a frustum with a diameter that gradually increases from left to right, and the left end face of the plug abuts against and limits the movement of the right end face of the large cylindrical section.

[0010] In the aforementioned intelligent thermostatic valve for water heaters, the power unit is located at the right end of the valve body, and a sealing sleeve is provided inside the valve body on the right side of the cold water inlet channel. The right end of the valve stem passes through the sealing sleeve and connects to the power unit. The elastic element is a compression spring located between the plug and the sealing sleeve, and the compression spring is fitted onto the valve stem.

[0011] In the aforementioned intelligent thermostatic valve for water heaters, the elastic element can also be a tension spring or a torsion spring.

[0012] In the aforementioned intelligent thermostatic valve for water heaters, a first sealing ring is provided between the sealing sleeve and the valve body, and a second sealing ring is provided between the sealing sleeve and the valve stem, and two or more second sealing rings are provided, with an isolation slider provided between adjacent two second sealing rings and mounted on the valve stem.

[0013] In the aforementioned intelligent thermostatic valve for water heaters, the power unit is a motor fixedly mounted on the valve body. The right end of the valve body is provided with a threaded hole located on the right side of the sealing sleeve. A fixed sleeve for limiting the sealing sleeve and a movable sleeve for moving the valve stem are screwed into the threaded hole. The right end of the valve stem extends out of the sealing sleeve and is fixedly connected to the movable sleeve. A splined shaft is connected to the rotating shaft of the motor. The movable sleeve is provided with an internal spline that matches the splined shaft.

[0014] In the aforementioned intelligent thermostatic valve for water heaters, the valve stem and the movable sleeve are fixedly connected by screws, with the shank of the screw passing through the movable sleeve and screwed onto the valve stem.

[0015] In the aforementioned intelligent thermostatic valve for water heaters, the motor shaft and splined shaft are fixedly connected by screws, with the screw shank passing through the splined shaft and screwed onto the motor shaft.

[0016] In the aforementioned intelligent thermostatic valve for water heaters, the right end face of the fixing sleeve is recessed to form a straight line or cross-shaped indentation.

[0017] In the aforementioned intelligent thermostatic valve for a water heater, the outer wall of the sealing sleeve is stepped, comprising cylindrical segment one, cylindrical segment two, and cylindrical segment three arranged sequentially from left to right. The diameter of cylindrical segment one is larger than that of cylindrical segment two, and the diameter of cylindrical segment two is larger than that of cylindrical segment three. Cylindrical segment one has an abutment section on its left side that abuts and limits the right end face of the cold water inlet. The fixing sleeve includes a threaded segment screwed into a threaded hole and an annular segment located on the left side of the threaded segment. The left end face of the annular segment abuts and limits the right end face of cylindrical segment two. The fixing sleeve has a fitting hole for fitting onto cylindrical segment three. The right end face of the fitting hole has an annular protrusion protruding to the left. The sealing ring one is fitted onto cylindrical segment two and limited between cylindrical segment one and the annular segment. The inner wall of the sealing sleeve is recessed to form an installation groove. The sealing ring two and the isolation slider are disposed in the installation groove and limited between the left end face of the installation groove and the annular protrusion.

[0018] The outstanding advantages of this utility model compared to the prior art are: This invention uses a temperature sensor to detect the water temperature in the outlet channel, a power unit to drive the valve stem to move, adjusting blocks one and two to adjust the flow rate of the hot water outlet, and a plug and elastic element to adjust the flow rate of the cold water outlet. This allows for timely adjustment of the outlet water temperature, effectively preventing water temperature fluctuations and sudden changes in temperature. Furthermore, this invention controls the flow rates of both the hot and cold water outlets with a single power unit and elastic element. The design is ingenious, requires fewer power units, is simple in structure, low in cost, and easy to manufacture and install. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is a cross-sectional view of the cold water inlet of this utility model in the closed state.

[0021] Figure 3 This is a cross-sectional view of the cold water inlet of this utility model in the open state.

[0022] Reference numerals: 1. Valve body; 2. Hot water inlet channel; 3. Mixing chamber; 4. Cold water inlet channel; 5. Hot water outlet; 6. Cold water outlet; 7. Valve stem; 7a. Large cylindrical section; 7b. Small cylindrical section; 8. Adjusting block one; 9. Adjusting block two; 10. Plug; 11. Elastic element; 12. Water outlet channel; 13. Sealing sleeve; 13a. Cylindrical section one; 13b. Cylindrical section two; 13c. Cylindrical section three; 13d. Abutment section; 14. Sealing ring one; 15. Sealing ring two; 16. Isolation slider; 17. Motor; 18. Threaded hole; 19. Fixed sleeve; 19a. Threaded section; 19b. Circular section; 19c. Circular protrusion; 20. Moving sleeve; 21. Splined shaft; 22. Internal spline. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —3: The intelligent thermostatic valve for a water heater includes a valve body 1 and a controller. The valve body 1 contains, from left to right, a hot water inlet channel 2, a mixing chamber 3, and a cold water inlet channel 4. The hot water inlet channel 2 connects to the water outlet pipe of the water heater. The mixing chamber 3 is connected to the hot water inlet channel 2 via a hot water outlet 5 and to the cold water inlet channel 4 via a cold water outlet 6. The valve body 1 contains a valve stem 7 that moves laterally, driven by a power device. The left end of the valve stem 7 has two adjustment blocks: a first adjustment block 8 and a second adjustment block 9, used to adjust the flow rate of the hot water inlet channel 2. The second adjustment block 9 is located to the right of the first adjustment block 8. A plug 10 for sealing the cold water outlet 6 is slidably fitted onto the valve stem 7. The valve body 1 contains an elastic element 11 that springs back the plug 10 to the left and an outlet channel 12 connected to the mixing chamber 3. The valve body 1 has a temperature sensor for detecting the water temperature in the outlet channel 12. The controller controls the power device to drive the valve stem 7 to move laterally based on the information transmitted by the temperature sensor.

[0024] Figure 2 , 3 The arrows in the diagram indicate the direction of water flow.

[0025] The working principle of this utility model: The initial state of this utility model is as follows Figure 1 , 2 As shown, the hot water inlet 5 is located between the regulating block 8 and the regulating block 9. When the water temperature detected by the temperature sensor is lower than the set value, the controller controls the power unit to drive the valve stem 7 to move to the left. The regulating block 9 reduces the flow rate of the hot water inlet 5, reducing the outflow of hot water from the water heater, thereby allowing the water temperature in the water heater to rise to the set value as quickly as possible. At this time, the plug 10 blocks the cold water inlet 6 under the elastic force of the elastic element 11, that is, cold water does not flow out of the cold water inlet 6. When the water temperature detected by the temperature sensor is higher than the set value, the controller controls the power unit to drive the valve stem 7 to move to the right. The regulating block 8 reduces the flow rate of the hot water inlet 5. The valve stem 7 pushes the plug 10 to move to the right, opening the cold water inlet 6, and causing the elastic element 11 to undergo elastic deformation. The hot water from the water heater enters the mixing chamber 3 through the water heater outlet pipe, the hot water inlet channel 2, and the hot water inlet 5. The cold water from the cold water pipe enters the mixing chamber 3 through the cold water inlet channel 4 and the cold water inlet 6. The hot and cold water mix in the mixing chamber 3 and then flow out through the outlet channel 12, lowering the water temperature in the outlet channel 12. Figure 3 As shown.

[0026] When valve stem 7 is in the leftward position, if the water temperature detected by the temperature sensor is lower than the set value, the controller controls the power unit to drive valve stem 7 to continue to move to the left, and the regulating block 2 9 continues to reduce the flow rate of hot water port 5. At this time, the plug 10 blocks the cold water port 6 under the elastic force of the elastic element 11, that is, cold water does not come out of the cold water port 6.

[0027] When valve stem 7 is in the leftward position, if the water temperature detected by the temperature sensor is higher than the set value, the controller controls the power unit to drive valve stem 7 to move to the right, and the regulating block 2 9 increases the flow rate of hot water port 5 until valve stem 7 returns to the initial state.

[0028] When valve stem 7 is in the rightward position, if the water temperature detected by the temperature sensor is lower than the set value, the controller controls the power unit to drive valve stem 7 to move to the left, and the regulating block 8 increases the flow rate of hot water port 5 until valve stem 7 returns to the initial state. Under the action of the elastic force of elastic element 11, plug 10 resets to the left and closes cold water port 6.

[0029] When valve stem 7 is in the rightward position, if the water temperature detected by the temperature sensor is higher than the set value, the controller controls the power unit to drive valve stem 7 to continue moving to the right, and the regulating block 8 continues to reduce the flow rate of hot water outlet 5.

[0030] This invention uses a temperature sensor to detect the water temperature in the outlet channel 12, a power unit to drive the valve stem 7 to move, and adjusting blocks 1 and 2 to adjust the flow rate of the hot water outlet 5. The plug 10 and the elastic element 11 adjust the flow rate of the cold water outlet 6, which can adjust the outlet water temperature in a timely manner and effectively avoid the phenomenon of water interruption and temperature fluctuation. At the same time, this invention controls the flow rate of the hot water outlet 5 and the cold water outlet 6 through a single power unit and elastic element 11. The structure is ingenious, requires few power units, is simple in structure, low in cost, and easy to process and install.

[0031] The specific structures of adjusting block 8 and adjusting block 9 are as follows: Figure 2 , 3 As shown, the right end of the first adjustment block 8 is a frustum shape with a diameter that gradually decreases from left to right, and the left end of the second adjustment block 9 is a frustum shape with a diameter that gradually increases from left to right.

[0032] In order to minimize the space occupied by adjusting blocks 8 and 9 while ensuring their strength, such as Figure 2 , 3 As shown, the left end of the first adjustment block 8 is a frustum shape with a diameter that gradually increases from left to right, and the right end of the second adjustment block 9 is a frustum shape with a diameter that gradually decreases from left to right.

[0033] Furthermore, the first adjusting block 8 and the second adjusting block 9 are integral with the valve stem 7.

[0034] To ensure the maximum water flow area of ​​the hot water inlet 5, the distance between the right end face of the first adjusting block 8 and the left end face of the second adjusting block 9 is greater than the width of the hot water inlet 5.

[0035] The structure of valve stem 7 and its mounting structure with plug 10: as follows Figure 2 ,3 As shown, the valve stem 7 is stepped, comprising a large cylindrical section 7a and a small cylindrical section 7b located to the right of the large cylindrical section 7a. The plug 10 is slidably fitted onto the small cylindrical section 7b. The plug 10 is a frustum with a diameter that gradually increases from left to right, and its left end face abuts against and limits the movement of the plug 10 against the right end face of the large cylindrical section 7a. The structure is simple and easy to manufacture and install. When the valve stem 7 moves to the right, the right end face of the large cylindrical section 7a abuts against the left end face of the plug 10, pushing the plug 10 to the right. When the valve stem 7 moves to the left, the plug 10 moves to the left under the elastic force of the elastic element until the left end face of the plug 10 abuts against the right end face of the large cylindrical section 7a.

[0036] The structure of elastic element 11: as follows Figure 1-3 As shown, the power unit is located at the right end of the valve body 1. The valve body 1 is provided with a sealing sleeve 13 located on the right side of the cold water inlet channel 4. The right end of the valve stem 7 passes through the sealing sleeve 13 and is connected to the power unit. The elastic element 11 is a compression spring provided between the plug 10 and the sealing sleeve 13. The compression spring is fitted on the valve stem 7.

[0037] To prevent leakage, a first sealing ring 14 is provided between the sealing sleeve 13 and the valve body 1, fitted onto the outside of the sealing sleeve 13. A second sealing ring 15 is provided between the sealing sleeve 13 and the valve stem 7, fitted onto the outside of the valve stem 7. There are two or more second sealing rings 15, and an isolation slider 16 fitted onto the valve stem 7 is provided between adjacent second sealing rings 15, resulting in a good sealing effect. In this embodiment, two second sealing rings 15 are provided.

[0038] The specific installation structure of the power unit and valve stem 7 is as follows: Figure 1-3 As shown, the power unit is a motor 17 fixedly mounted on the valve body 1. The valve body 1 has a threaded hole 18 located on the right side of the sealing sleeve 13. A fixed sleeve 19, which limits the position of the sealing sleeve 13, and a movable sleeve 20, which moves the valve stem 7, are screwed into the threaded hole 18. The right end of the valve stem 7 extends out of the sealing sleeve 13 and is fixedly connected to the movable sleeve 20. A splined shaft 21 is connected to the rotating shaft of the motor 17. The movable sleeve 20 has an internal spline 22 that matches the splined shaft 21. When the rotating shaft of the motor 17 rotates, it drives the splined shaft 21 to rotate. Since the movable sleeve 20 is screwed to the valve body 1, it moves laterally relative to the valve body 1 while rotating, and simultaneously moves laterally relative to the splined shaft 21.

[0039] The specific connection structure between valve stem 7 and movable sleeve 20: valve stem 7 and movable sleeve 20 are fixedly connected by screws, and the shank of the screw passes through movable sleeve 20 and is screwed to valve stem 7.

[0040] The specific connection structure between the rotating shaft of motor 17 and spline shaft 21 is as follows: the rotating shaft of motor 17 and spline shaft 21 are fixedly connected by screws, and the shank of the screw passes through spline shaft 21 and is screwed to the rotating shaft of motor 17.

[0041] To facilitate the rotation of the fixing sleeve 10 into the valve body 1, the right end face of the fixing sleeve 19 is recessed to form a straight line or cross-shaped indentation.

[0042] The specific structure of the sealing sleeve 13, the fixed sleeve 19, and the movable sleeve 20 is as follows: Figure 2 , 3 As shown, the outer wall of the sealing sleeve 13 is stepped, including cylindrical section 13a, cylindrical section 13b, and cylindrical section 13c arranged sequentially from left to right. The diameter of cylindrical section 13a is larger than that of cylindrical section 13b, and the diameter of cylindrical section 13b is larger than that of cylindrical section 13c. Cylindrical section 13a has an abutment section 13d on its left side that abuts and limits the movement of the right end face of the cold water inlet 6. The fixing sleeve 19 includes a threaded section 19a screwed into the threaded hole 18 and an annular section 19b located to the left of the threaded section 19a. The left end face of segment 19b abuts and limits the right end face of cylindrical segment 13b. The fixing sleeve 19 has a fitting hole for fitting onto cylindrical segment 13c. The right end face of the fitting hole has an annular protrusion 19c protruding to the left. The sealing ring 14 is fitted onto cylindrical segment 13b and limited between cylindrical segment 13a and annular segment 19b. The inner side wall of the sealing sleeve 13 is recessed to form an installation groove. The sealing ring 15 and the isolation slider 16 are set in the installation groove and limited between the left end face of the installation groove and the annular protrusion 19c.

[0043] In order to realize the flow and temperature correction and error correction functions of this valve, when the motor 17 is powered on each time, the controller controls the motor 17 to return to zero, so that the valve stem 17 is reset and the hot water port 5 returns to the position between the regulating block 1 8 and the regulating block 2 9.

[0044] The operating rotation angle of motor 17's shaft is selectable in two ways: 0° to 270° and 0° to 180°. The power-on reset position is set at the midpoint between 0° and the maximum rotation angle of motor 17. When powered on and reset, the hot water inlet 5 has the maximum flow rate, and the cold water inlet 6 is blocked by plug 10 and is in a closed state. When valve stem 7 moves to the left, adjusting block 2 9 reduces the flow rate of hot water inlet 5, decreasing the outflow of hot water from the water heater, thereby increasing the water temperature inside the water heater. When valve stem 7 moves to the right, adjusting block 1 8 reduces the flow rate of hot water inlet 5, and valve stem 7 pushes plug 10 to the right, opening cold water inlet 6.

[0045] To reduce space requirements, the controller is embedded in the motor 17 to form an integrated motor controller. The controller incorporates the most accurate AI digital algorithm currently available, achieving a constant temperature function with a temperature error of no more than 0.2℃ within 0.5 seconds.

[0046] Under low-temperature conditions, when the water heater operates within its rated output power range, the outlet water temperature often fails to reach the set constant temperature value due to low ambient or ambient temperatures. The controller, based on the temperature difference feedback from the temperature sensor, sends a command to motor 17 to adjust the hot water inlet channel 2, ensuring the water temperature in the outlet channel 12 reaches a constant temperature. The flow rate adjustment range of this valve can automatically adjust from 10 liters to 2 liters, depending on the required water temperature. This function can be used for constant temperature regulation in instant water heaters.

[0047] When the water heater is in normal use, if the water pressure changes due to external environmental factors, causing the outlet water temperature to fluctuate, or if the gas water heater experiences a water outage and heating phenomenon, this valve can quickly detect the change in outlet water temperature and adjust the flow rate of the hot water inlet channel 2 or open the cold water inlet channel 4 to siphon cold water within 0.2 seconds to achieve the purpose of constant temperature water supply.

[0048] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An intelligent thermostatic valve for water heaters, characterized in that: The device includes a valve body (1) and a controller. The valve body (1) is provided with a hot water inlet channel (2), a mixing chamber (3), and a cold water inlet channel (4) from left to right. The hot water inlet channel (2) is connected to the water outlet pipe of the water heater. The mixing chamber (3) is connected to the hot water inlet channel (2) through a hot water outlet (5) and to the cold water inlet channel (4) through a cold water outlet (6). The valve body (1) is provided with a valve stem (7) that is driven by a power device to move laterally. The left end of the valve stem (7) is provided with a valve for adjusting the flow rate of the hot water inlet channel (2). The valve body (1) has an adjusting block 1 (8) and an adjusting block 2 (9), the adjusting block 2 (9) being located to the right of the adjusting block 1 (8). A plug (10) for sealing the cold water inlet (6) is slidably fitted on the valve stem (7). The valve body (1) is provided with an elastic element (11) that causes the plug (10) to reset to the left and a water outlet channel (12) communicating with the mixing chamber (3). The valve body (1) is provided with a temperature sensor for detecting the water temperature in the water outlet channel (12). The controller controls the power device to drive the valve stem (7) to move laterally according to the information transmitted by the temperature sensor.

2. The intelligent thermostatic valve for a water heater according to claim 1, characterized in that: The right end of the first adjustment block (8) is a frustum shape with a diameter that gradually decreases from left to right, and the left end of the second adjustment block (9) is a frustum shape with a diameter that gradually increases from left to right.

3. The intelligent thermostatic valve for a water heater according to claim 2, characterized in that: The left end of the first adjustment block (8) is a frustum shape with a diameter that gradually increases from left to right, and the right end of the second adjustment block (9) is a frustum shape with a diameter that gradually decreases from left to right.

4. The intelligent thermostatic valve for a water heater according to claim 2, characterized in that: The distance between the right end face of the first adjusting block (8) and the left end face of the second adjusting block (9) is greater than the width of the hot water inlet (5).

5. The intelligent thermostatic valve for a water heater according to claim 1, characterized in that: The valve stem (7) is stepped, including a large cylindrical section (7a) and a small cylindrical section (7b) located to the right of the large cylindrical section (7a). The plug (10) is slidably fitted on the small cylindrical section (7b). The plug (10) is a frustum with a diameter that gradually increases from left to right, and the left end face of the plug (10) abuts against and limits the right end face of the large cylindrical section (7a).

6. The intelligent thermostatic valve for a water heater according to claim 1, characterized in that: The power unit is located at the right end of the valve body (1). The valve body (1) is provided with a sealing sleeve (13) located on the right side of the cold water inlet channel (4). The right end of the valve stem (7) passes through the sealing sleeve (13) and connects to the power unit. The elastic element (11) is a compression spring located between the plug (10) and the sealing sleeve (13). The compression spring is mounted on the valve stem (7).

7. The intelligent thermostatic valve for a water heater according to claim 6, characterized in that: A sealing ring 1 (14) is provided between the sealing sleeve (13) and the valve body (1) and is fitted outside the sealing sleeve (13). A sealing ring 2 (15) is provided between the sealing sleeve (13) and the valve stem (7) and is fitted outside the valve stem (7). There are two or more sealing rings 2 (15), and an isolation slider (16) is provided between two adjacent sealing rings 2 (15) fitted on the valve stem (7).

8. The intelligent thermostatic valve for a water heater according to claim 7, characterized in that: The power unit is a motor (17) fixedly installed on the valve body (1). The valve body (1) has a threaded hole (18) located on the right side of the sealing sleeve (13). The threaded hole (18) is screwed with a fixed sleeve (19) for limiting the sealing sleeve (13) and a movable sleeve (20) for moving the valve stem (7). The right end of the valve stem (7) extends out of the sealing sleeve (13) and is fixedly connected to the movable sleeve (20). A spline shaft (21) is connected to the rotating shaft of the motor (17). The movable sleeve (20) has an internal spline (22) that is compatible with the spline shaft (21).

9. The intelligent thermostatic valve for a water heater according to claim 8, characterized in that: The outer wall of the sealing sleeve (13) is stepped, including cylindrical section one (13a), cylindrical section two (13b), and cylindrical section three (13c) arranged sequentially from left to right. The diameter of cylindrical section one (13a) is larger than the diameter of cylindrical section two (13b), and the diameter of cylindrical section two (13b) is larger than the diameter of cylindrical section three (13c). Cylindrical section one (13a) has an abutment section (13d) on its left side that abuts and limits the right end face of the cold water inlet (6). The fixing sleeve (19) includes a threaded section (19a) that is screwed into the threaded hole (18) and an annular section (19b) located on the left side of the threaded section (19a). The left end face of the annular segment (19b) abuts against and limits the right end face of the cylindrical segment two (13b). The fixing sleeve (19) is provided with a fitting hole for fitting onto the cylindrical segment three (13c). The right end face of the fitting hole has an annular protrusion (19c) protruding to the left. The sealing ring one (14) is fitted outside the cylindrical segment two (13b) and limited between the cylindrical segment one (13a) and the annular segment (19b). The inner side wall of the sealing sleeve (13) is recessed to form an installation groove. The sealing ring two (15) and the isolation slider (16) are set in the installation groove and limited between the left end face of the installation groove and the annular protrusion (19c).

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