A small water heater

Abstract

14. The invention discloses a small water heater, comprising a water inlet pipe, a pressure-stabilizing valve, a flow regulating valve, a heating water tank and a water outlet pipe; the pressure-stabilizing valve comprises a valve body, a valve seat, a valve core and a vent member are arranged in the valve body; the valve body is connected with the water inlet pipe and the flow regulating valve respectively; the valve seat is tightly attached to the inner wall of the water inlet end of the valve body, and a gap is left between the valve seat and the inner wall of the water outlet end of the valve body; a water inlet cavity is arranged inside the valve seat, and the water inlet cavity is provided with a water outlet, and water flows from the water inlet end of the valve body through the water inlet cavity and the water outlet in sequence into the water outlet end of the valve body; the valve core comprises a sleeve and a spring sleeved in the sleeve; one end of the sleeve is sleeved outside the valve seat, and the sleeve is driven by water pressure to move and adjust the opening size of the water outlet; one end of the vent member is slidably connected to the sleeve, and the other end of the vent member is fixedly connected to the valve body; a vent hole is arranged in the vent member; one end of the vent hole is connected with the sleeve, and the other end of the vent hole is connected with the outside of the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, in particular to a small water heater. Background Art

[0002] A water heater is a device that uses various physical principles to increase the temperature of cold water into hot water within a certain period of time. According to different principles, it can be divided into electric water heaters, gas water heaters, solar water heaters, magnetic water heaters, air water heaters, heating water heaters, etc. The heating water tank of existing instant small water heaters is generally directly connected to the tap water pipe through the water inlet pipe. The tap water flowing into the heating water tank is instantly heated and flows out from the outlet pipe. There is no pressure stabilizing device. However, the tap water pressure provided by the water supply system is usually unstable. When the water pressure is too high, the water flow rate entering the heating water tank is fast and the heating time is short, resulting in a lower water temperature in the outlet pipe; when the water pressure is too low, the water flow rate entering the heating water tank is slow and the heating time is long, resulting in a higher water temperature in the outlet pipe, which can easily lead to unstable heating of the water heater and affect the heating effect of the water heater. Summary of the Invention

[0003] The purpose of the present invention is to provide a small water heater, which can adaptively adjust the water flow rate according to the tap water pressure, stabilize the water pressure provided by the external tap water, and effectively improve the heating stability of the small water heater so that the water temperature after heating is relatively stable and the use effect is good.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A small water heater comprises a water inlet pipe, a pressure regulating valve, a flow regulating valve, a heating water tank and a water outlet pipe arranged in sequence along the direction of water flow; the pressure regulating valve comprises a valve body, within which a valve seat, a valve core and a vent are arranged in sequence along the direction of water flow; the two ends of the valve body are respectively connected to the water inlet pipe and the flow regulating valve; the valve seat is in close contact with the inner wall of the water inlet end of the valve body, and a gap is left between the valve seat and the inner wall of the water outlet end of the valve body; a water inlet cavity is arranged inside the valve seat, and a water passage is arranged on the side wall of the water inlet cavity Water flows from the water inlet end of the valve body through the water inlet cavity and the water outlet in sequence into the water outlet end of the valve body; the valve core includes a sleeve and a spring sleeved in the sleeve; one end of the sleeve is tightly sleeved outside the valve seat, and the sleeve is driven by water pressure to move and adjust the opening size of the water outlet; one end of the vent is slidably connected to the sleeve, and the other end of the vent is fixedly connected to the valve body; a vent is provided in the vent; one end of the vent is communicated with the inner cavity of the sleeve, and the other end of the vent is communicated with the outside of the valve body.

[0006] Preferably, the water inlet pipe includes a cold water pipe, a sleeve pipe and a connecting pipe; the upper end of the cold water pipe is connected to the water inlet end of the valve body, and water inlets are respectively opened on both sides of the lower end of the cold water pipe; one end of the connecting pipe is passed through and fixed on the sleeve pipe, and the other end of the connecting pipe is connected to the tap water pipe; the sleeve pipe is tightly sleeved on the outside of the cold water pipe at the water inlet, and the connecting pipe is connected to one of the water inlets by rotating the sleeve pipe.

[0007] Preferably, the connecting pipe is provided with a debris removal mechanism for intercepting impurities in the water; the debris removal mechanism includes a debris removal pipe and a debris removal plug; the debris removal pipe is fixed through the lower side of the connecting pipe; a filter is fixed on the upper end of the debris removal plug; the filter is inserted into the connecting pipe from bottom to top, and the debris removal plug is threadedly connected to the debris removal pipe.

[0008] Preferably, there is a distance between the de-impurity plug and the connecting pipe, and the impurities intercepted by the filter screen are deposited in the de-impurity pipe above the de-impurity plug.

[0009] Preferably, a first sealing groove is provided on the cold water pipe outside the water inlet; a first sealing ring is provided on the first sealing groove; one side of the first sealing ring is tightly embedded in the first sealing groove, and the other side thereof is tightly attached to the inner wall of the sleeve tube; a second sealing groove is provided on the de-impurity plug; a second sealing ring is provided on the second sealing groove; one side of the second sealing ring is tightly embedded in the second sealing groove, and the other side thereof is tightly attached to the de-impurity pipe.

[0010] Preferably, a drain pipe is provided in the cold water pipe; the upper end of the drain pipe is connected to the water inlet end of the valve body, and the lower end of the drain pipe is connected to the inner cavity of the cold water pipe; an electromagnetic valve is provided on the cold water pipe, and the water in the cold water pipe is controlled by the electromagnetic valve to flow from the drain pipe to the pressure regulating valve.

[0011] Preferably, a third sealing ring is provided at the place where the valve seat contacts the inner wall of the valve body; a third sealing groove is provided on the valve seat; one side of the third sealing ring is tightly embedded in the third sealing groove, and the other side thereof is tightly attached to the inner wall of the valve body; a fourth sealing ring is provided at the place where the valve seat contacts the inner wall of the sleeve; a fourth sealing groove is provided on the valve seat; one side of the fourth sealing ring is tightly embedded in the fourth sealing groove, and the other side thereof is tightly attached to the inner wall of the sleeve; a fifth sealing ring is provided at the place where the sleeve contacts the vent; a fifth sealing groove is provided on the sleeve; one side of the fifth sealing ring is tightly embedded in the fifth sealing groove, and the other side thereof is tightly attached to the vent.

[0012] Preferably, a plurality of reinforcing ribs are fixed at intervals on the inner wall of the valve body; the reinforcing ribs are located outside the sleeve

[0013] Preferably, the heating water tank comprises a water storage tank and a heating element arranged on the water storage tank, and the water in the water storage tank is heated by the heating element.

[0014] Preferably, a water level pipe is provided in the heating water tank for improving the water heating effect; the lower end of the water level pipe is fixed on the heating water tank, and the upper end of the water level pipe is located above the water outlet end of the flow regulating valve; the water outlet end of the flow regulating valve is connected with the lower part of the water storage tank, and the water outlet pipe is connected with the lower end of the water level pipe, and the heated water is discharged from the water outlet pipe through the water level pipe.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects:

[0016] When the water inlet is too small, the sleeve moves away from the water inlet of the valve body under the action of the restoring force of the spring, so that the sleeve gradually opens the opening of the water outlet, thereby increasing the water flow to the water outlet end of the valve body, and finally achieving a dynamic balance between the water outlet pressure and the restoring force of the spring. The water flow rate can be adaptively adjusted according to the water pressure of the tap water, and the water pressure provided by the external tap water can be stabilized. The heating stability of the small water heater can be effectively improved, so that the temperature of the heated water is relatively stable and the use effect is good.

[0017] 2. The small water heater of the present invention can be installed on the left or right side by rotating the sleeve pipe according to actual installation needs. It has good versatility and can not only effectively reduce the amount of water pipes, but also simplify the water pipe lines and is easy to use.

[0018] 3. The present invention provides a small water heater. The filter on the debris removal plug can effectively intercept impurities in the water. The debris removal plug is threadedly connected to the debris removal pipe, which is convenient for quick disassembly or installation and easy to clean. At the same time, a distance is reserved between the debris removal plug and the connecting pipe, which can be used to precipitate impurities intercepted by the filter, which not only avoids clogging of the connecting pipe but also facilitates the centralized removal of impurities.

[0019] 4. In a small water heater of the present invention, the first sealing ring and the second sealing ring can improve the sealing effect of the water inlet pipe, and the third sealing ring, the fourth sealing ring and the fifth sealing ring can improve the sealing effect of the pressure-stabilizing valve, which can effectively improve the working stability of the small water heater.

[0020] 5. In a small water heater of the present invention, the reinforcing ribs can improve the strength of the valve body, effectively reduce the impact of water pressure on the inner wall of the valve body, and reduce the deformation or even burst of the valve body due to water pressure.

[0021] 6. The present invention provides a small water heater, wherein the water inlet of the water level pipe is located above the water outlet end of the flow regulating valve, so that water can be accumulated in the water storage tank from bottom to top, and after being effectively heated by the heating element, it flows into the water inlet of the water level pipe from the upper end and is finally discharged from the water outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is an exploded structural diagram of the present invention;

[0024] Figure 3 It is a three-dimensional structural diagram of the water storage tank of the present invention;

[0025] Figure 4 It is a schematic cross-sectional view of the water inlet pipe, pressure-stabilizing valve and flow-regulating valve of the present invention;

[0026] Figure 5 It is a partial exploded view of the water inlet pipe of the present invention;

[0027] Figure 6 This is a partial enlarged view of the cold water pipe of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the impurity removal plug and filter screen of the present invention;

[0029] Figure 8 Schematic diagram of the cross-section structure of the water inlet pipe of the present invention;

[0030] Figure 9 It is an exploded structural diagram of the pressure-stabilizing valve of the present invention;

[0031] Figure 10 Schematic diagram of the cross-section structure of the pressure-stabilizing valve of the present invention;

[0032] Figure 11 This is a schematic diagram of the cross-section structure of the pressure-stabilizing valve of the present invention when the reinforcing ribs are avoided;

[0033] Figure 12 This is a schematic diagram of the cross-section structure of the pressure-stabilizing valve of the present invention when the valve core is not installed;

[0034] Figure 13 It is a schematic diagram of the cross-sectional structure of the pressure-stabilizing valve of the present invention when viewed from above.

[0035] The reference numerals in the figures are as follows:

[0036] 1. Water inlet pipe; 10. Cold water pipe; 100. Water inlet; 101. First sealing groove; 102. Drain pipe; 103. Solenoid valve; 11. Socket pipe; 12. Connecting pipe; 13. Debris removal mechanism; 130. Debris removal pipe; 131. Debris removal plug; 1310. Second sealing groove; 132. Filter screen; 14. First sealing ring; 15. Second sealing ring; 2. Pressure regulating valve; 20. Valve body; 21. Valve seat; 210. Water inlet chamber; 2 11. Water outlet; 212. Third sealing groove; 213. Fourth sealing groove; 22. Valve core; 220. Sleeve; 2200. Fifth sealing groove; 221. Spring; 23. Ventilation piece; 230. Vent hole; 24. Third sealing ring; 25. Fourth sealing ring; 26. Fifth sealing ring; 27. Reinforcing rib; 3. Flow regulating valve; 4. Heating water tank; 40. Water storage tank; 41. Heating element; 42. Water level pipe; 5. Water outlet pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] See also Figures 1 to 13 A small water heater includes a water inlet pipe 1, a pressure regulating valve 2, a flow regulating valve 3, a heating water tank 4 and a water outlet pipe 5 arranged in sequence along the water flow direction. The water flow path in the water inlet pipe 1, the pressure regulating valve 2 and the flow regulating valve 3 is as follows: Figure 4 As shown by line B in FIG. 2 , the pressure-stabilizing valve 2 includes a valve body 20, in which a valve seat 21, a valve core 22 and a vent 23 are sequentially arranged along the direction of water flow. The two ends of the valve body 20 are respectively connected to the water inlet pipe 1 and the flow regulating valve 3. The valve seat 21 is in close contact with the inner wall of the water inlet end of the valve body 20, and a gap is left between the valve seat 21 and the inner wall of the water outlet end of the valve body 20. A water inlet cavity 210 is provided inside the valve seat 21, and a water through port 211 is provided on the side wall of the water inlet cavity 210. Water flows into the valve body 20 from the water inlet end through the water inlet cavity 210 and the water through port 211 in sequence. The water outlet end of the valve body 20; the valve core 22 includes a sleeve 220 and a spring 221 sleeved in the sleeve 220; one end of the sleeve 220 is tightly sleeved on the outside of the valve seat 21, and the sleeve 220 is driven by water pressure to move and adjust the opening size of the water outlet 211; one end of the vent 23 is slidably connected to the sleeve 220, and the other end of the vent 23 is fixedly connected to the valve body 20; a vent hole 230 is provided in the vent 23; one end of the vent hole 230 is connected to the inner cavity of the sleeve 220, and the other end of the vent hole 230 is connected to the outside of the valve body 20.

[0039] like Figure 2 、 Figure 4 、 Figure 5 and Figure 8 As shown, the water inlet pipe 1 includes a cold water pipe 10, a sleeve pipe 11 and a connecting pipe 12; the upper end of the cold water pipe 10 is connected to the water inlet end of the valve body 20, and water inlets 100 are respectively opened on both sides of the lower end of the cold water pipe 10; one end of the connecting pipe 12 is passed through and fixed on the sleeve pipe 11, and the other end of the connecting pipe 12 is connected to the tap water pipe; the sleeve pipe 11 is tightly sleeved on the outside of the cold water pipe 10 at the water inlet 100, and the connecting pipe 12 is connected to one of the water inlets 100 by rotating the sleeve pipe 11.

[0040] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 As shown, the connecting pipe 12 is provided with a debris removal mechanism 13 for intercepting impurities in the water; the debris removal mechanism 13 includes a debris removal pipe 130 and a debris removal plug 131; the debris removal pipe 130 is fixed through the lower side of the connecting pipe 12; a filter screen 132 is fixed on the upper end of the debris removal plug 131; the filter screen 132 is inserted into the connecting pipe 12 from bottom to top, and the debris removal plug 131 is threadedly connected to the debris removal pipe 130.

[0041] like Figure 6 、 Figure 7 and Figure 8 As shown, there is a distance between the de-impurity plug 131 and the connecting pipe 12 , and the impurities intercepted by the filter 132 are deposited in the de-impurity pipe 130 above the de-impurity plug 131 .

[0042] like Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13 As shown, a first sealing groove 101 is provided on the cold water pipe 10 outside the water inlet 100; a first sealing ring 14 is provided on the first sealing groove 101; one side of the first sealing ring 14 is tightly embedded in the first sealing groove 101, and the other side thereof is tightly attached to the inner wall of the sleeve pipe 11; a second sealing groove 1310 is provided on the de-impurity plug 131; a second sealing ring 15 is provided on the second sealing groove 1310; one side of the second sealing ring 15 is tightly embedded in the second sealing groove 1310, and the other side thereof is tightly attached to the de-impurity pipe 130.

[0043] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8As shown, a drain pipe 102 is provided in the cold water pipe 10; the upper end of the drain pipe 102 is connected to the water inlet end of the valve body 20, and the lower end of the drain pipe 102 is connected to the inner cavity of the cold water pipe 10; a solenoid valve 103 is provided on the cold water pipe 10, and the solenoid valve 103 controls the water in the cold water pipe 10 to flow from the drain pipe 102 to the pressure regulating valve 2; Figure 8 It is a structural diagram when the solenoid valve 103 is closed, and line A is the water flow path.

[0044] like Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13 As shown, a third sealing ring 24 is provided at the place where the valve seat 21 contacts the inner wall of the valve body 20; a third sealing groove 212 is provided on the valve seat 21; one side of the third sealing ring 24 is tightly embedded in the third sealing groove 212, and the other side thereof is tightly attached to the inner wall of the valve body 20; a fourth sealing ring 25 is provided at the place where the valve seat 21 contacts the inner wall of the sleeve 220; a fourth sealing groove 213 is provided on the valve seat 21; one side of the fourth sealing ring 25 is tightly embedded in the fourth sealing groove 213, and the other side thereof is tightly attached to the inner wall of the sleeve 220; a fifth sealing ring 26 is provided at the place where the sleeve 220 contacts the breather 23; a fifth sealing groove 2200 is provided on the sleeve 220; one side of the fifth sealing ring 26 is tightly embedded in the fifth sealing groove 2200, and the other side thereof is tightly attached to the breather 23.

[0045] like Figure 11 、 Figure 12 and Figure 13 As shown, the inner wall of the valve body 20 is fixed with multiple reinforcing ribs 27 at intervals; the reinforcing ribs 27 are located outside the sleeve 220.

[0046] like Figure 1 、 Figure 2 and Figure 5 As shown, the heating water tank 4 includes a water storage tank 40 and a heating element 41 arranged on the water storage tank 40, and the water in the water storage tank 40 is heated by the heating element 41.

[0047] like Figure 1 、 Figure 2 and Figure 3 As shown, a water level pipe 42 for improving the water heating effect is provided in the heating water tank 4; the lower end of the water level pipe 42 is fixed on the heating water tank 4, and the upper end of the water level pipe 42 is located above the water outlet end of the flow regulating valve 3; the water outlet end of the flow regulating valve 3 is connected with the lower part of the water storage tank 40, and the water outlet pipe 5 is connected with the lower end of the water level pipe 42, and the heated water is discharged from the water outlet pipe 5 through the water level pipe 42.

[0048] The working principle of the present invention is as follows:

[0049] When using a small water heater according to the present invention, first place the first sealing ring 14 in the first sealing groove 101, then put the sleeve 11 on the outside of the cold water pipe 10, and according to the position of the tap water pipe reserved in the actual use place (not shown in the figure), the connecting pipe 12 is installed on the side convenient for connecting with the tap water pipe by rotating the sleeve 11; then, the debris removal plug 131 is installed on the debris removal pipe 130 by rotating so that the filter screen 132 extends into the connecting pipe 12, which can effectively intercept impurities in the water and concentrate the impurities in the debris removal pipe 130 for easy centralized disassembly and cleaning. Secondly, the filtered tap water flows into the cold water pipe 10 through the water inlet 100, and by opening the solenoid valve 103, the water in the cold water pipe 10 flows to the water inlet end of the valve body 20 through the drain pipe 102; then, the water in the water inlet end of the valve body 20 flows into the water outlet end of the valve body 20 from the water inlet cavity 210 and the water outlet 211. The water accumulated in the water outlet end of the valve body 20 will generate a downward reverse pressure on the sleeve 220. When the water inlet pressure increases, the water flowing to the water outlet end of the valve body 20 also increases in pressure. The water pressure pushes the sleeve 220 downward to overcome the resistance of the spring 221. When the sleeve 220 moves toward the water inlet end, the gas inside the sleeve 220 is discharged from the vent hole 230, so that the sleeve 220 gradually closes the opening of the water port 211, reducing the water flow to the water outlet end of the valve body 20; when the water flow to the water outlet end of the valve body 20 is too small, under the action of the restoring force of the spring 221, the sleeve 220 moves away from the water inlet end of the valve body 20, so that the sleeve 220 gradually opens the opening of the water port 211, increasing the water flow to the water outlet end of the valve body 20, and finally achieving a dynamic balance between the water outlet pressure and the restoring force of the spring 221, which can automatically adjust the pressure of the tap water. The water flow rate should be adjusted; finally, the water flow at the water outlet end of the valve body 20 flows into the water tank 40 through the flow regulating valve 3. When the water accumulates in the water tank 40 from bottom to top, the heating element 41 can effectively heat the water, and the heated hot water flows into the water inlet of the water level pipe 42 from the upper end and is finally discharged from the outlet pipe 5; therefore, the small water heater can adaptively adjust the water flow rate according to the tap water pressure, stabilize the water pressure provided by the external tap water, and effectively improve the heating stability of the small water heater, so that the temperature of the heated water is relatively stable, and the water inlet pipe 1 has strong versatility and good use effect.

[0050] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A small water heater, characterized by: The invention comprises a water inlet pipe (1), a pressure regulating valve (2), a flow regulating valve (3), a heating water tank (4) and a water outlet pipe (5) which are sequentially arranged along the direction of water flow; the pressure regulating valve (2) comprises a valve body (20), and a valve seat (21), a valve core (22) and a vent (23) are sequentially arranged in the valve body (20) along the direction of water flow; the two ends of the valve body (20) are respectively connected to the water inlet pipe (1) and the flow regulating valve (3); the valve seat (21) is in close contact with the inner wall of the water inlet end of the valve body (20), and the valve seat (21) is in close contact with the valve body (20) A gap is left between the inner walls of the water outlet end; a water inlet cavity (210) is provided inside the valve seat (21), and a water outlet (211) is provided on the side wall of the water inlet cavity (210), and water flows from the water inlet end of the valve body (20) through the water inlet cavity (210) and the water outlet (211) in sequence into the water outlet end of the valve body (20); the valve core (22) includes a sleeve (220) and a spring (221) sleeved in the sleeve (220); one end of the sleeve (220) is tightly sleeved outside the valve seat (21), and the spring (221) is provided through the sleeve (220). The water pressure drives the sleeve (220) to move and adjust the opening size of the water outlet (211); one end of the vent member (23) is slidably connected to the sleeve (220), and the other end of the vent member (23) is fixedly connected to the valve body (20); a vent hole (230) is provided in the vent member (23); one end of the vent hole (230) is communicated with the inner cavity of the sleeve (220), and the other end of the vent hole (230) is communicated with the outside of the valve body (20); the heating water tank (4) includes a water storage tank (40) and a The heating element (41) on the tank (40) heats the water in the water storage tank (40) through the heating element (41). A water level pipe (42) for improving the water heating effect is provided in the heating water tank (4); the lower end of the water level pipe (42) is fixed to the heating water tank (4), and the upper end of the water level pipe (42) is located above the water outlet end of the flow regulating valve (3); the water outlet end of the flow regulating valve (3) is connected to the lower part of the water storage tank (40), and the water outlet pipe (5) is connected to the lower end of the water level pipe (42), and the heated water is discharged from the water outlet pipe (5) through the water level pipe (42).

2. A small water heater according to claim 1, characterized in that: The water inlet pipe (1) comprises a cold water pipe (10), a sleeve pipe (11) and a connecting pipe (12); the upper end of the cold water pipe (10) is connected to the water inlet end of the valve body (20), and water inlets (100) are respectively opened on both sides of the lower end of the cold water pipe (10); one end of the connecting pipe (12) is passed through and fixed on the sleeve pipe (11), and the other end of the connecting pipe (12) is connected to the tap water pipe; the sleeve pipe (11) is tightly sleeved on the outside of the cold water pipe (10) at the water inlet (100), and the connecting pipe (12) is connected to one of the water inlets (100) by rotating the sleeve pipe (11).

3. A small water heater according to claim 2, characterized in that: The connecting pipe (12) is provided with a de-impurity mechanism (13) for intercepting impurities in water; the de-impurity mechanism (13) comprises a de-impurity pipe (130) and a de-impurity plug (131); the de-impurity pipe (130) is fixed to the lower side of the connecting pipe (12); a filter screen (132) is fixed to the upper end of the de-impurity plug (131); the filter screen (132) is inserted into the connecting pipe (12) from bottom to top, and the de-impurity plug (131) is threadedly connected to the de-impurity pipe (130).

4. A small water heater according to claim 3, characterized in that: A distance is left between the impurity removal plug (131) and the connecting pipe (12), and impurities intercepted by the filter (132) are deposited in the impurity removal pipe (130) above the impurity removal plug (131).

5. A small water heater according to claim 4, characterized in that: A first sealing groove (101) is provided on the cold water pipe (10) outside the water inlet (100); a first sealing ring (14) is provided on the first sealing groove (101); one side of the first sealing ring (14) is tightly embedded in the first sealing groove (101), and the other side thereof is in close contact with the inner wall of the sleeve pipe (11); a second sealing groove (1310) is provided on the de-impurity plug (131); a second sealing ring (15) is provided on the second sealing groove (1310); one side of the second sealing ring (15) is tightly embedded in the second sealing groove (1310), and the other side thereof is in close contact with the de-impurity pipe (130).

6. A small water heater according to claim 2, characterized in that: A drain pipe (102) is provided in the cold water pipe (10); the upper end of the drain pipe (102) is communicated with the water inlet end of the valve body (20), and the lower end of the drain pipe (102) is communicated with the inner cavity of the cold water pipe (10); a solenoid valve (103) is provided on the cold water pipe (10), and the solenoid valve (103) controls the water in the cold water pipe (10) to flow from the drain pipe (102) to the pressure regulating valve (2).

7. A small water heater according to claim 1, characterized in that: A third sealing ring (24) is provided at the place where the valve seat (21) contacts the inner wall of the valve body (20); a third sealing groove (212) is provided on the valve seat (21); one side of the third sealing ring (24) is tightly embedded in the third sealing groove (212), and the other side thereof is tightly attached to the inner wall of the valve body (20); a fourth sealing ring (25) is provided at the place where the valve seat (21) contacts the inner wall of the sleeve (220); a fourth sealing groove is provided on the valve seat (21). (213); one side of the fourth sealing ring (25) is tightly embedded in the fourth sealing groove (213), and the other side thereof is in close contact with the inner wall of the sleeve (220); a fifth sealing ring (26) is provided at the place where the sleeve (220) contacts the vent (23); a fifth sealing groove (2200) is provided on the sleeve (220); one side of the fifth sealing ring (26) is tightly embedded in the fifth sealing groove (2200), and the other side thereof is in close contact with the vent (23).

8. A small water heater according to claim 1, characterized in that: A plurality of reinforcing ribs (27) are fixed at intervals on the inner wall of the valve body (20); the reinforcing ribs (27) are located outside the sleeve (220).

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