Novel vertical water heater with cold water and hot water separated and manufacturing method

By using the design of guide riser and aluminum alloy water partition in the single-gas water heater, the separation of hot and cold water is achieved, solving the problems of high material usage and insufficient hot water supply of double-gas water heater, reducing costs and ensuring the continuous supply of hot water.

CN119915006APending Publication Date: 2025-05-02曹元一
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Patent Information

Application Number
CN202510335709.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2025-05-02

AI Technical Summary

Technical Problem

The existing double-coail water heater has a large amount of materials and a high cost, and the supply of hot water is insufficient when many people use it continuously.

Method used

A new vertical water heater with hot and cold water separation is designed, adopting a single-gasp structure, the inner liner is equipped with a guide riser and an aluminum alloy water partition plate. The water partition plate moves up and down on the guide riser through the water level change, and touches the valve to open and close alternately to control the hot and cold water separation.

Benefits of technology

It realizes effective separation of hot and cold water, improves the output efficiency of hot water, reduces the amount and cost of materials, and ensures the continuous supply of hot water.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a novel cold and hot water separated vertical water heater and a preparation method, the water heater is characterized in that a guide vertical pipe is assembled in a single-cavity inner container, the guide vertical pipe is sleeved with a water-stop sheet, the outer edge of the water-stop sheet is attached to two inner side walls of the single-cavity inner container, and the outer edge of the water-stop sheet is attached to the inner side walls of the single-cavity inner container; the manufacturing method comprises the steps that firstly, a stainless steel lever is manufactured, and the upper end and the lower end of the stainless steel lever are connected with a first valve and a second valve respectively; secondly, a stainless steel guide vertical pipe is manufactured; and thirdly, the guide vertical pipe provided with the arc-shaped stainless steel lever is fixed to the top of the single-cavity inner container, and the aluminum alloy hollow buoyancy water-stop sheet is arranged on the guide vertical pipe in a sleeving mode. The single-container water heater has the beneficial effects that the single-container water heater can continuously supply hot water, and the material consumption of the water heater is reduced to the maximum extent. And the material consumption is low, the cost is low, the process is simple and the performance is reliable.
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Description

Technical Field

[0001] The invention relates to a vertical water heater and a preparation method thereof, and in particular to a novel vertical water heater for separating hot and cold water and a preparation method thereof. Background Art

[0002] At present, electric water heaters are still the mainstream form of household water heaters, especially storage water heaters, which have a market share of 60%. Storage water heaters are divided into single-tank and double-tank types. In addition to the different material usage, their performance is also quite different. Since cold water will enter the single-tank water heater at the same time when hot water is output, the mixing of cold and hot water will reduce the storage temperature, resulting in a gradual decrease in the outlet water temperature, which will lead to insufficient hot water supply when multiple people use it continuously. The double-tank water heater is provided with two upper and lower water storage tanks connected by a conduit. The upper and lower water tanks are heated at the same time, the upper water tank outputs hot water, and the lower water tank inputs cold water. After the upper water tank outputs hot water, it is supplemented by the rising hot water in the lower water tank. The double-tank water heater can continuously output hot water for a relatively long time, but the material usage is large and the cost is high. To this end, the present invention proposes a design and preparation method for a single-tank water storage water heater with a hollow buoyancy baffle for cold and hot water to avoid direct mixing of cold and hot water and improve the output efficiency of hot water. Summary of the invention

[0003] The main purpose of the present invention is to solve the problem of large material consumption and high cost of existing double-tank water heaters, and to provide a new vertical water heater with cold and hot water separation and a preparation method.

[0004] The novel vertical water heater with cold and hot water separation provided by the present invention is equipped with a guide riser in a single-cavity inner tank, a water baffle is sleeved on the guide riser, the outer edge of the water baffle is in contact with the two inner side walls of the single-cavity inner tank, the water baffle can move up and down on the guide riser according to the change of water level in the inner cavity of the single-cavity inner tank, the lower part of the guide riser is equipped with a limit plate to prevent the water baffle from falling off the guide riser, the top of the single-cavity inner tank is provided with a cold water inlet hole, the bottom of the single-cavity inner tank is provided with a hot water outlet hole, and the bottom of the single-cavity inner tank is equipped with a heater.

[0005] The guide riser is a hollow structure made of a thin-walled rectangular stainless steel tube, wherein the top of the guide riser is fixed to the bottom of the top cover of the single-cavity inner tank, the bottom of the guide riser is a closed structure, a first water inlet and a second water inlet are symmetrically provided on the side wall of the upper part of the guide riser, a water outlet is provided on the side wall on one side of the lower part of the guide riser, a first valve is installed in the first water inlet, and a second valve is installed in the water outlet, the first valve and the second valve are respectively connected to the upper and lower ends of a lever inserted in the inner cavity of the guide riser, and the baffle can touch the first valve and the second valve respectively to open and close alternately during the up and down movement of the guide riser.

[0006] The baffle is a hollow floating structure made of a sealed hollow aluminum alloy sheet. The baffle can float up and down on the guide riser as the water level in the inner cavity of the single-cavity liner changes.

[0007] The lever inserted in the inner cavity of the guide standpipe is made of a stainless steel plate, the middle of the lever is pivotally connected to the inner wall of the guide standpipe through a pin shaft, and the lever can rotate around the pin shaft.

[0008] The first valve is composed of a first connecting rod, a first vertical plate and a first valve core, wherein the first valve core is assembled on a side of the first vertical plate corresponding to the first water inlet, the first valve core is a semicircular steel sheet, the size of the first valve core corresponds to the size of the first water inlet, the first connecting rod is vertically connected to the first vertical plate and the first valve core, and the first valve is fixedly connected to the upper end of the lever in the inner cavity of the guide vertical pipe through the first connecting rod.

[0009] The second valve is composed of a second connecting rod, a second vertical plate, a second valve core and a rubber gasket, wherein the second valve core is assembled on one side of the rubber gasket corresponding to the water outlet, the second vertical plate is assembled on the other side of the rubber gasket, the size of the second valve core corresponds to the size of the water outlet, the second valve core is a semicircular steel sheet, the second vertical plate is a circular steel sheet, the second connecting rod is vertically connected to the second vertical plate, the second valve core and the rubber gasket, and the second valve is fixedly connected to the lower end of the lever in the inner cavity of the guide vertical pipe through the second connecting rod.

[0010] The working principle of the novel vertical water heater with hot and cold water separation provided by the present invention is as follows:

[0011] When the single-cavity liner is full of water and no water is drained, the hollow buoyancy baffle is located at the top of the single-cavity liner, and the outlet at the lower end of the guide riser is closed by the second valve. When the hot water outlet at the bottom of the single-cavity liner discharges hot water and the cold water inlet at the top of the single-cavity liner injects cold water, the hollow buoyancy baffle moves downward due to the pressure of the cold water. At this time, the baffle separates the hot and cold water in the inner cavity of the single-cavity liner. The upper part of the inner cavity of the single-cavity liner is cold water, and the lower part of the inner cavity of the single-cavity liner is hot water. When the hollow buoyancy baffle reaches the outlet position at the lower end of the guide riser, the baffle touches the second valve to open the outlet at the lower end of the guide riser, and cold water is injected from the inner cavity of the guide riser into the lower part of the inner cavity of the single-cavity liner. The baffle begins to float slowly due to the balance of upper and lower pressures. When the hollow buoyancy baffle floats to the position of the first water inlet and the second water inlet on the upper part of the guide riser, the first valve on the same side as the lower water outlet of the guide riser drives the second valve to close the lower water outlet of the guide riser through the lever in the inner cavity of the guide riser under the touch of the baffle. At this time, the baffle separates the upper and lower water bodies in the inner cavity of the single-cavity liner and returns to the initial state.

[0012] The guide riser is made of a thin-walled rectangular stainless steel tube. The upper end of the guide riser is fixed to the top of the inner cavity of the single-cavity liner, and the lower end of the guide riser is sealed. The first water inlet and the second water inlet are symmetrically opened on the side wall of the upper part of the guide riser, wherein the second water inlet is always in an open state, and a semicircular first valve is installed in the first water inlet. The lower part of the guide riser is provided with a water outlet on the side where the first water inlet is opened, and a semicircular second valve is installed in the water outlet. The first valve and the second valve are respectively connected to the upper and lower ends of the lever in the inner cavity of the guide riser. The water baffle can touch the first valve and the second valve to control the first valve and the second valve to open and close alternately under the action of the lever during the up and down movement of the guide riser. The lower end of the guide riser is equipped with a limit plate to prevent the water baffle from falling off the guide riser.

[0013] The invention provides a method for preparing a novel vertical water heater with cold and hot water separation, and the method comprises the following steps:

[0014] Step 1: First, make a curved stainless steel lever with a rectangular cross-section size of 2×4 mm. The length of the curved stainless steel lever is adapted to the height of the rectangular guide riser in the single-cavity inner tank. The upper and lower ends of the curved stainless steel lever are respectively connected to the first valve and the second valve;

[0015] Step 2: Make a stainless steel guide riser with a side length of 2-3cm and a thickness of 1mm. The first water inlet and the second water inlet are symmetrically provided on the upper side wall of the guide riser, and the water outlet is provided at the lower part of the guide riser. The middle part of the arc-shaped stainless steel lever is fixed to the middle part of the guide riser through a pin shaft, so that the first valve at the upper end of the stainless steel lever corresponds to the first water inlet, and the second valve at the lower end of the stainless steel lever corresponds to the water outlet. Under the action of the stainless steel lever, the first valve and the second valve are alternately opened and closed;

[0016] The third step is to fix the guide riser with the installed arc-shaped stainless steel lever on the top of the single-cavity inner liner, install the aluminum alloy hollow buoyancy baffle on the guide riser, set a limit plate at the lower part of the guide riser at the lower water outlet to prevent the baffle from falling off the guide riser, open a cold water inlet hole at the top of the single-cavity inner liner, open a hot water outlet hole at the bottom of the single-cavity inner liner, and set a heater between the bottom of the guide riser and the bottom of the single-cavity inner liner.

[0017] Beneficial effects of the present invention:

[0018] The novel vertical water heater with cold and hot water separation provided by the present invention and the preparation method thereof are characterized in that a stainless steel guide riser and an aluminum alloy water-isolating hollow buoyancy plate device are arranged inside the single-tank electric water heater. The hollow buoyancy plate repeatedly descends and rises under the action of water inlet pressure and buoyancy, opens and closes the water inlet switch at the lower part of the guide riser, controls the mixing node of cold and hot water, separates the cold and hot water before the hot water is drained, fully utilizes hot water resources, reduces electricity consumption, enables the single-tank water heater to continuously supply hot water, and minimizes the material usage of the water heater.

[0019] The technical solution provided by the present invention only uses one inner tank and one heater, which saves material consumption, has low cost, simple process and reliable performance. It can be used without power supply for users who use a small amount of hot water at a time, thus saving energy to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of a novel vertical water heater with cold and hot water separation according to the present invention.

[0021] Figure 2 The present invention Figure 1 Schematic diagram of section 1-1.

[0022] Figure 3 The present invention Figure 1 Schematic diagram of section 2-2.

[0023] Figure 4 The present invention Figure 1 Schematic diagram of section 3-3.

[0024] Figure 5 It is an enlarged schematic diagram of the first valve described in the present invention.

[0025] Figure 6 It is an enlarged schematic diagram of the second valve described in the present invention.

[0026] Figure 7 It is a schematic cross-sectional view of the water-blocking plate described in the present invention.

[0027] Figure 8 It is a schematic diagram of the longitudinal section of the water-blocking plate described in the present invention.

[0028] Fig. 9 It is a front schematic diagram of the guide riser described in the present invention.

[0029] Fig.10 It is a side schematic diagram of the guide riser described in the present invention.

[0030] The annotations in the image above are as follows:

[0031] 1. Single-cavity liner 2. Guide riser 3. Water baffle 4. Limit plate 5. Cold water inlet hole

[0032] 6. Hot water outlet 7. Heater 8. First water inlet 9. Second water inlet

[0033] 10. Water outlet 11. First valve 12. Second valve 13. Lever

[0034] 14, first connecting rod 15, first vertical plate 16, first valve core 17, second connecting rod

[0035] 18. second vertical plate 19. second valve core 20. rubber gasket. DETAILED DESCRIPTION

[0036] See also Figures 1 to 10 As shown:

[0037] The novel vertical water heater with hot and cold water separation provided by the present invention is equipped with a guide riser 2 in a single-cavity inner tank 1, and a water baffle 3 is sleeved on the guide riser 2. The outer edge of the water baffle 3 is in contact with the two inner side walls of the single-cavity inner tank 1. The water baffle 3 can move up and down on the guide riser 2 according to the change of the water level in the inner cavity of the single-cavity inner tank 1. The lower part of the guide riser 2 is equipped with a limit plate 4 for preventing the water baffle 3 from falling off the guide riser 2. A cold water inlet hole 5 is opened at the top of the single-cavity inner tank 1, a hot water outlet hole 6 is opened at the bottom of the single-cavity inner tank 1, and a heater 7 is installed at the bottom of the single-cavity inner tank 1.

[0038] The guide riser 2 is a hollow structure made of a thin-walled rectangular stainless steel tube, wherein the top end of the guide riser 2 is fixed to the bottom of the top cover of the single-cavity inner tank 1, and the bottom of the guide riser 2 is a closed structure. A first water inlet 8 and a second water inlet 9 are symmetrically provided on the side wall of the upper part of the guide riser 2, and a water outlet 10 is provided on the side wall of one side of the lower part of the guide riser 2. A first valve 11 is installed in the first water inlet 8, and a second valve 12 is installed in the water outlet 10. The first valve 11 and the second valve 12 are respectively connected to the upper and lower ends of a lever 13 inserted in the inner cavity of the guide riser 2, and the baffle 3 can touch the first valve 11 and the second valve 12 respectively to open and close alternately during the up and down movement of the guide riser 2.

[0039] The baffle plate 3 is a hollow floating structure made of a sealed hollow aluminum alloy sheet. The baffle plate 3 can float up and down on the guide riser 2 as the water level in the inner cavity of the single-cavity liner 1 changes.

[0040] The lever 13 inserted into the inner cavity of the guide standpipe 2 is made of a stainless steel plate. The middle of the lever 13 is pivotally connected to the inner wall of the guide standpipe 2 through a pin shaft, and the lever 13 can rotate around the pin shaft.

[0041] The first valve 11 is composed of a first connecting rod 14, a first vertical plate 15 and a first valve core 16, wherein the first valve core 16 is assembled on a side of the first vertical plate 15 corresponding to the first water inlet 8, the first valve core 16 is a semicircular steel sheet, the size of the first valve core 16 corresponds to the size of the first water inlet 8, the first connecting rod 14 is vertically connected to the first vertical plate 15 and the first valve core 16, and the first valve 11 is fixedly connected to the upper end of the lever 13 in the inner cavity of the guide standpipe 2 through the first connecting rod 14.

[0042] The second valve 12 is composed of a second connecting rod 17, a second vertical plate 18, a second valve core 19 and a rubber gasket 20, wherein the second valve core 19 is assembled on one side of the rubber gasket 20 corresponding to the water outlet 10, and the second vertical plate 18 is assembled on the other side of the rubber gasket 20, the size of the second valve core 19 corresponds to the size of the water outlet 10, the second valve core 19 is a semicircular steel sheet, the second vertical plate 18 is a circular steel sheet, the second connecting rod 17 is vertically connected to the second vertical plate 18, the second valve core 19 and the rubber gasket 20, and the second valve 12 is fixedly connected to the lower end of the lever 13 in the inner cavity of the guide standpipe 2 through the second connecting rod 17.

[0043] The working principle of the novel vertical water heater with hot and cold water separation provided by the present invention is as follows:

[0044] When the single-chamber liner 1 is full of water and no water is discharged, the hollow buoyancy baffle 3 is located at the top of the single-chamber liner 1, and the water outlet 10 at the lower end of the guide riser 2 is closed by the second valve 12. When the hot water outlet 6 at the bottom of the single-chamber liner 1 discharges hot water and the cold water inlet 5 at the top of the single-chamber liner 1 injects cold water, the hollow buoyancy baffle 3 moves downward due to the pressure of the cold water. At this time, the baffle 3 separates the hot and cold water in the inner cavity of the single-chamber liner 1. The upper part of the inner cavity of the single-chamber liner 1 is cold water, and the lower part of the inner cavity of the single-chamber liner 1 is hot water. When the hollow buoyancy baffle 3 reaches the position of the water outlet 10 at the lower end of the guide riser 2, the baffle 3 touches the second valve 12 to open the water outlet 10 at the lower end of the guide riser 2, and cold water is injected from the inner cavity of the guide riser 2 into the lower part of the inner cavity of the single-chamber liner 1. The baffle 3 begins to float slowly due to the balance of upper and lower pressures. When the hollow buoyancy baffle 3 floats to the position of the first water inlet 8 and the second water inlet 9 on the upper part of the guide riser 2, the first valve 11 on the same side as the lower water outlet 10 of the guide riser 2 drives the second valve 12 to close the lower water outlet 10 of the guide riser 2 through the lever 13 in the inner cavity of the guide riser 2 under the touch of the baffle 3. At this time, the baffle 3 separates the upper and lower water bodies in the inner cavity of the single-cavity inner liner 1 and restores it to the initial state.

[0045] The guide riser 2 is made of a thin-walled rectangular stainless steel tube, the upper end of the guide riser 2 is fixed to the top of the inner cavity of the single-cavity liner 1, and the lower end of the guide riser 2 is sealed. A first water inlet 8 and a second water inlet 9 are symmetrically provided on the side wall of the upper part of the guide riser 2, wherein the second water inlet 9 is always in an open state, and a semicircular first valve 11 is installed in the first water inlet 8, and a water outlet 10 is provided on the lower part of the guide riser 2 on the side where the first water inlet 8 is provided, and a semicircular second valve 12 is installed in the water outlet 10, and the first valve 11 and the second valve 12 are respectively connected to the upper and lower ends of the lever 13 in the inner cavity of the guide riser 2, and the water baffle 3 can control the alternating opening and closing of the first valve 11 and the second valve 12 under the action of the lever 13 by touching the first valve 11 and the second valve 12 during the up and down movement on the guide riser 2, and a limit plate 4 is installed at the lower end of the guide riser 2 to prevent the water baffle 3 from falling off the guide riser 2.

[0046] The invention provides a method for preparing a novel vertical water heater with cold and hot water separation, and the method comprises the following steps:

[0047] Step 1: First, make a curved stainless steel lever 13 with a rectangular cross-section size of 2×4 mm. The length of the curved stainless steel lever 13 is adapted to the height of the rectangular guide riser 2 in the single-cavity liner 1. The upper and lower ends of the curved stainless steel lever 13 are respectively connected to the first valve 11 and the second valve 12;

[0048] Step 2: Make a stainless steel guide riser 2 with a side length of 2-3 cm and a thickness of 1 mm. The first water inlet 8 and the second water inlet 9 are symmetrically provided on the upper side wall of the guide riser 2. The water outlet is provided at the lower part of the guide riser 2. The middle part of the arc-shaped stainless steel lever 13 is fixed to the middle part of the guide riser 2 through a pin shaft. The first valve 11 at the upper end of the stainless steel lever 13 corresponds to the first water inlet 8, and the second valve 12 at the lower end of the stainless steel lever 13 corresponds to the water outlet 10. Under the action of the stainless steel lever 13, the first valve 11 and the second valve 12 are alternately opened and closed;

[0049] The third step is to fix the guide riser 2 with the arc-shaped stainless steel lever 13 installed on the top of the single-cavity inner liner 1, and install the aluminum alloy hollow buoyancy baffle 3 on the guide riser 2. A limit plate 4 is set below the lower water outlet 10 of the guide riser 2 to prevent the baffle 3 from falling off the guide riser 2. A cold water inlet hole 5 is opened at the top of the single-cavity inner liner 1, a hot water outlet hole 6 is opened at the bottom of the single-cavity inner liner 1, and a heater 7 is set between the bottom of the guide riser 2 and the bottom of the single-cavity inner liner 1.

Claims

1. A new vertical water heater with hot and cold water separation, characterized by: A guide riser is installed in a single-cavity inner liner, and a water-blocking plate is provided on the guide riser. The outer edge of the water-blocking plate fits with the two inner walls of the single-cavity inner liner. The water-blocking plate can move up and down on the guide riser according to the change of the water level in the inner cavity of the single-cavity inner liner. A limit plate is installed at the lower part of the guide riser to prevent the water-blocking plate from falling off the guide riser. A cold water inlet hole is opened at the top of the single-cavity inner liner, a hot water outlet hole is opened at the bottom of the single-cavity inner liner, and a heater is installed at the bottom of the single-cavity inner liner.

2. A novel vertical water heater with hot and cold water separation according to claim 1, characterized in that: The guide riser is a hollow structure made of a thin-walled rectangular stainless steel tube, wherein the top of the guide riser is fixed to the bottom of the top cover of the single-cavity inner tank, the bottom of the guide riser is a closed structure, a first water inlet and a second water inlet are symmetrically provided on the side wall of the upper part of the guide riser, a water outlet is provided on the side wall on one side of the lower part of the guide riser, a first valve is installed in the first water inlet, and a second valve is installed in the water outlet, the first valve and the second valve are respectively connected to the upper and lower ends of a lever inserted in the inner cavity of the guide riser, and the baffle can touch the first valve and the second valve respectively to open and close alternately during the up and down movement of the guide riser.

3. A novel vertical water heater with hot and cold water separation according to claim 1, characterized in that: The water baffle is a hollow floating structure made of a sealed hollow aluminum alloy sheet. The water baffle can float up and down on the guide riser as the water level in the inner cavity of the single-cavity liner changes.

4. A novel vertical water heater with hot and cold water separation according to claim 2, characterized in that: The lever inserted in the inner cavity of the guide standpipe is made of a stainless steel plate, the middle of the lever is pivotally connected to the inner wall of the guide standpipe through a pin shaft, and the lever can rotate around the pin shaft.

5. A novel vertical water heater with hot and cold water separation according to claim 2, characterized in that: The first valve is composed of a first connecting rod, a first vertical plate and a first valve core, wherein the first valve core is assembled on a side of the first vertical plate corresponding to the first water inlet, the first valve core is a semicircular steel sheet, the size of the first valve core corresponds to the size of the first water inlet, the first connecting rod is vertically connected to the first vertical plate and the first valve core, and the first valve is fixedly connected to the upper end of the lever in the inner cavity of the guide vertical pipe through the first connecting rod.

6. A novel vertical water heater with hot and cold water separation according to claim 2, characterized in that: The second valve is composed of a second connecting rod, a second vertical plate, a second valve core and a rubber gasket, wherein the second valve core is assembled on one side of the rubber gasket corresponding to the water outlet, and the second vertical plate is assembled on the other side of the rubber gasket. The size of the second valve core corresponds to the size of the water outlet. The second valve core is a semicircular steel sheet, and the second vertical plate is a circular steel sheet. The second connecting rod is vertically connected to the second vertical plate, the second valve core and the rubber gasket, and the second valve is fixedly connected to the lower end of the lever in the inner cavity of the guide vertical pipe through the second connecting rod.

7. A method for preparing a novel vertical water heater with cold and hot water separation, characterized in that: The method comprises the following steps: Step 1: First, make a curved stainless steel lever with a rectangular cross-section size of 2×4 mm. The length of the curved stainless steel lever is adapted to the height of the rectangular guide riser in the single-cavity inner tank. The upper and lower ends of the curved stainless steel lever are respectively connected to the first valve and the second valve; Step 2: Make a stainless steel guide riser with a side length of 2-3cm and a thickness of 1mm. The first water inlet and the second water inlet are symmetrically provided on the upper side wall of the guide riser, and the water outlet is provided at the lower part of the guide riser. The middle part of the arc-shaped stainless steel lever is fixed to the middle part of the guide riser through a pin shaft, so that the first valve at the upper end of the stainless steel lever corresponds to the first water inlet, and the second valve at the lower end of the stainless steel lever corresponds to the water outlet. Under the action of the stainless steel lever, the first valve and the second valve are alternately opened and closed; The third step is to fix the guide riser with the installed arc-shaped stainless steel lever on the top of the single-cavity inner liner, install the aluminum alloy hollow buoyancy baffle on the guide riser, set a limit plate at the lower part of the guide riser at the lower water outlet to prevent the baffle from falling off the guide riser, open a cold water inlet hole at the top of the single-cavity inner liner, open a hot water outlet hole at the bottom of the single-cavity inner liner, and set a heater between the bottom of the guide riser and the bottom of the single-cavity inner liner.