Differential pressure switch structure of instant water heater

Abstract

The utility model relates to a differential pressure switch structure of an instant water heater, which comprises a switch main body with an inner cavity, the switch main body is formed by covering a switch seat and a switch cover, and a differential pressure diaphragm is arranged in the switch main body; the pressure difference diaphragm divides the inner cavity into a pressurizing cavity or a pressure relief cavity, and the pressure difference diaphragm can protrude towards one side of the pressurizing cavity or one side of the pressure relief cavity under the hydraulic action; the pressurizing cavity is communicated with a first water inlet and a second water outlet of the switch main body, and the pressure relief cavity is connected with a reflux inlet of the switch main body; the switch main body is provided with a movable contact piece and a fixed contact piece which are communicated with a heating circuit of the water heater, and the movable end of the movable contact piece is driven by the differential pressure diaphragm to be in contact with or separated from the fixed contact piece, so that the heating circuit is connected or disconnected; and the balance structure ensures that the differential pressure diaphragm is in a balance position all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of electric water heaters, in particular to a pressure difference switch structure of a conventional water heater. Background Art

[0002] Household water heaters include instant faucets, electric water heaters, and electric water dispensers. The heating start system of the water heater includes a heating chamber with a heating tube and a water pressure chamber with a floating switch. The heating tube is electrically connected or disconnected through an elastic contact. When the hot water gear is turned on, water flows into the water pressure chamber, the water flow causes the floating switch to float up, and the floating switch triggers the elastic contact to connect the heating tube. When the hot water gear is turned off, no water flows into the water pressure chamber, the floating switch sinks, and the elastic contact separates to disconnect the heating tube.

[0003] If the faucet does not produce water due to the accumulation of impurities and other reasons, and the hot water gear is always turned on, that is, the external tap water keeps supplying water to the water pressure chamber, the floating switch remains in the floating state due to the water pressure, which will cause the heating tube in the heating chamber to continue to heat up, and the water in the heating chamber will always be in the heating state, eventually drying up the heating chamber until the heating tube burns out, making the water heater scrapped. Currently, about 3-5% of instant hot water faucets have such a situation. Even more serious situations will be that the heating chamber will explode due to excessive hot air pressure, which will bring serious safety hazards.

[0004] In addition, there are some pressure differential switches in the prior art that are provided with a pressure differential diaphragm, which control the on and off of the switch by the change of the diaphragm. However, due to the difference in pressure on both sides of the pressure differential diaphragm, the pressure differential diaphragm cannot maintain a stable state during use, thereby making the heating circuit unstable. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a pressure difference switch structure of an instant water heater.

[0006] The above-mentioned problem of the utility model is solved by the following technical solutions:

[0007] A pressure differential switch structure for an instant water heater, comprising a switch body with an inner cavity formed by a switch seat and a switch cover, wherein a pressure differential diaphragm is arranged in the switch body; the pressure differential diaphragm divides the inner cavity into a pressurizing cavity or a pressure relief cavity, and the pressure differential diaphragm can protrude toward one side of the pressurizing cavity or the pressure relief cavity under the action of hydraulic pressure;

[0008] The boost chamber is connected to the first water inlet and the second water outlet of the switch body, and the pressure relief chamber is connected to the return port of the switch body;

[0009] The switch body is provided with a moving contact piece and a fixed contact piece connected to the water heater heating circuit, and the movable end of the moving contact piece is driven by the pressure difference diaphragm to contact or disengage with the fixed contact piece, thereby turning on or off the heating circuit;

[0010] It also includes a balancing structure, which ensures that the pressure difference diaphragm is always in a balanced position.

[0011] By adopting the above technical solution and setting a balancing structure, it is ensured that the pressure differential diaphragm is always in a balanced position. No matter which side the pressure differential diaphragm is protruding or in a horizontal position, it always remains in this state without sudden or unstable changes.

[0012] The above technical solution is further configured as follows: the balancing structure comprises a valve stem and a balancing rod arranged on both sides of the pressure differential diaphragm, and the switch body is symmetrically provided with a valve hole and a balancing hole;

[0013] The valve stem extends from the first end surface of the pressure differential diaphragm and extends out of the switch body through the valve hole to support the movable contact piece;

[0014] The balancing rod extends into the balancing hole.

[0015] By adopting the above technical solution, a valve stem is provided to drive the movable contact piece, and at the same time, a symmetrical balance rod is provided to balance the valve stem, so that the end faces on both sides of the pressure differential diaphragm are subjected to balanced forces;

[0016] At the same time, a balancing hole is set to balance the valve hole so that the air pressure entering the pressure chamber and the pressure relief chamber is equal.

[0017] The above technical solution is further configured as follows: the balancing structure further comprises a first waterproof cover and a second waterproof cover symmetrically arranged, the first waterproof cover is located outside the valve stem, and the second waterproof cover is located outside the balancing stem;

[0018] The first waterproof cover and the second waterproof cover are respectively supported by two inner end surfaces of the switch body.

[0019] By adopting the above technical solution, two waterproof sleeves are set to seal the valve hole and the balance hole, so as to prevent the water in the boost chamber and the pressure relief chamber from overflowing through the valve hole and the balance hole and affecting the pressure inside the switch body.

[0020] The above technical solution is further configured as follows: waist-shaped grooves are provided on the outer circumferences of the first waterproof cover and the second waterproof cover.

[0021] By adopting the above technical solution, the waterproof sleeve is deformed by bending or the like at the waist groove, thereby reducing the pressure on the pressure differential diaphragm and allowing the pressure differential diaphragm to deform and bulge smoothly.

[0022] The above technical solution is further configured as follows: the pressure boosting chamber is located between the pressure differential diaphragm and the switch seat, and the pressure relief chamber is located between the switch cover and the pressure differential diaphragm; the moving contact piece and the fixed contact piece are arranged on the switch cover;

[0023] A first guide sleeve is provided on the inner wall of the switch cover extending toward the pressure relief chamber; a second guide sleeve symmetrical to the first guide sleeve is provided on the bottom of the switch seat toward the pressure boost chamber.

[0024] By adopting the above technical solution, two guide sleeves are set to limit the deformation position of the two waterproof sleeves to prevent them from blocking the moving path of the valve stem or the balance rod when deforming.

[0025] The above technical solution is further configured as follows: the first waterproof sleeve is arranged on the outer periphery of the first guide sleeve;

[0026] The second waterproof sleeve is sleeved on the outer circumference of the second guide sleeve.

[0027] The above technical solution is further configured as follows: the pressure difference diaphragm and the balance structure are integrally formed.

[0028] The above technical solution is further configured as follows: an end portion of the switch cover can be inserted into the switch seat for connection and fixed by a snap ring with a notch.

[0029] The above technical solution is further configured as follows: a groove capable of accommodating the insertion of a snap ring is provided on the outer wall of the switch cover, and a plug hole is provided on the switch seat;

[0030] The two ends of the clamping ring extend into the switch seat through the insertion hole and are clamped with the clamping grooves on the switch cover.

[0031] Compared with the prior art, the utility model has the following beneficial effects: a balancing structure is provided to ensure that the pressure differential diaphragm is always in a balanced position, and no matter which side the pressure differential diaphragm is in a convex position or a horizontal position, it always remains in this state without sudden or unstable changes; BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the exploded structure of the utility model.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of the switch body.

[0035] Figure 4 Schematic diagram of the cross-sectional structure of the pressure differential diaphragm.

[0036] Figure 5 Schematic diagram of the exploded structure of the retaining ring and the switch body.

[0037] Figure 6 This is a schematic diagram of the structure in which the snap ring is installed on the switch body.

[0038] Figure 7 This is an isometric cross-sectional view of the snap ring installed on the switch body.

[0039] The attached drawings are marked with: 100, switch seat; 101, first water inlet; 102, first water outlet; 104, balance hole; 110, second guide sleeve; 103, jack;

[0040] 200, switch cover; 201, valve hole; 202, return port; 210, first guide sleeve; 203, slot;

[0041] 300, differential pressure diaphragm; 310, valve stem; 320, balance bar; 330, first waterproof cover; 340, second waterproof cover; 301, waist-shaped groove;

[0042] 400, snap ring;

[0043] 500, fixed contact piece;

[0044] 600, moving contact piece;

[0045] a. Pressurization chamber;

[0046] b. Pressure relief chamber. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0048] like Figure 1-7 As shown, the following embodiment discloses a pressure difference switch structure of an instant water heater.

[0049] A pressure differential switch structure for an instant water heater, comprising a switch body with an inner cavity formed by a switch base 100 and a switch cover 200, wherein a pressure differential diaphragm 300 is arranged in the switch body; the pressure differential diaphragm 300 divides the inner cavity into a pressure-increasing cavity a or a pressure-relieving cavity b, and the pressure differential diaphragm 300 can protrude toward one side of the pressure-increasing cavity a or the pressure-relieving cavity b under the action of hydraulic pressure;

[0050] The boost chamber a is connected to the first water inlet 101 and the first water outlet 102 of the switch body, and the pressure relief chamber b is connected to the return port 202 of the switch body;

[0051] The switch body is provided with a moving contact piece 600 and a fixed contact piece 500 connected to the water heater heating circuit. The movable end of the moving contact piece 600 is driven by the pressure difference diaphragm 300 to contact or disengage with the fixed contact piece 500, thereby turning on or off the heating circuit.

[0052] A balance structure is also included. When the water heater is in a closed state, the balance structure ensures that the pressure difference diaphragm 300 is in a balanced position.

[0053] The above is the basic solution of this embodiment.

[0054] Specific reference Figure 1 As shown, the pressure differential diaphragm 300 is installed in the switch body, isolating the switch body into two upper and lower chambers. In this embodiment, the upper chamber is set as the pressure relief chamber b, and the lower chamber is set as the pressure boost chamber a; the fixed contact piece 500 is fixed on the pressure differential cover, one end of the moving contact piece 600 is fixed on the pressure differential cover, and the other end is driven by the pressure differential diaphragm 300 to make contact and disengage with the fixed contact piece 500, thereby controlling the conduction or disconnection of the heating circuit;

[0055] In this embodiment, the connection method between the pressure difference switch and the heating circuit is consistent with that in the prior art and will not be described in detail here.

[0056] The switching principle of the pressure difference switch is as follows: when the water heater is turned on, the water supply device supplies water to the water heater from the first water inlet 101, and the cold water enters the boosting chamber a through the first water inlet 101, and the pressure difference diaphragm 300 is pushed upward in the boosting chamber a, so that the pressure difference diaphragm 300 protrudes toward the side of the pressure relief chamber b. During the protruding process, the moving contact piece 600 is pushed toward the side of the fixed contact piece 500, so that the moving contact piece 600 and the fixed contact piece 500 are in contact, so that the heating circuit is turned on;

[0057] After the water heater is used, the water supply device stops supplying water. At this time, the pressurizing effect of the cold water on the pressurizing chamber a disappears. Since there is still water in the water path that has not been released, the remaining water enters the pressure relief chamber b through the reflux port 202. At this time, the pressure of the pressure relief chamber b is greater than the pressure of the pressurizing chamber a, pressing the pressure difference diaphragm 300 downward, thereby driving the moving contact piece 600 downward, that is, moving toward the side away from the fixed contact piece 500, so that the moving contact piece 600 and the fixed contact piece 500 are separated, and the heating circuit is disconnected;

[0058] That is to say, when the water supply device supplies water to the water heater, the heating circuit is turned on; and when the water supply device stops supplying water to the water heater, the heating circuit is disconnected;

[0059] In this way, it can be ensured that there is water in the water circuit of the water heater before turning on the heating component, thereby avoiding dry burning of the heating component, and also avoiding the discharge of cold water due to disconnection of the heating circuit during the water supply process.

[0060] However, since the pressure differential diaphragm is located inside the switch body, in order to contact the moving contact piece 600 outside the switch body, it is necessary to use an actuating component to extend from the inside of the switch body to the outside of the switch body to drive the moving contact piece 600. From the pressure formula F=P*S, it can be seen that the unequal air or water pressure in the two chambers will cause unequal pressure in the two chambers in the switch body, thereby causing the pressure differential diaphragm 300 to be unable to maintain a stable state. Therefore, a balancing structure is provided in this embodiment. The purpose of the balancing structure is to ensure that the pressure differential diaphragm 300 is always in a balanced position, and this balanced position does not refer to the horizontal position of the pressure differential diaphragm 300, but no matter which side the pressure differential diaphragm 300 is in, it always remains in this state without any sudden or unstable changes.

[0061] The specific configuration of the balance structure in this embodiment is as follows: the balance structure includes a valve stem 310 and a balance rod 320 arranged on both sides of the pressure difference diaphragm 300, and the valve hole 201 and the balance hole 104 are symmetrically arranged on the switch body;

[0062] The valve stem 310 extends from the first end surface of the pressure differential diaphragm 300 and extends out of the switch body through the valve hole 201 to support the movable contact piece 600;

[0063] The balancing rod 320 extends into the balancing hole 104 .

[0064] Specific reference Figures 2 to 4 As shown, the valve stem 310 and the balance rod 320 are respectively arranged at the center of the end surfaces of both sides of the pressure differential diaphragm 300 and extend toward both ends; the valve hole 201 is arranged on the switch cover 200, and the balance hole 104 is arranged at the bottom of the switch seat 100;

[0065] When the differential pressure diaphragm 300 protrudes toward the pressure relief chamber b, the valve stem 310 is pushed out from the valve hole 201, so that the end of the valve stem 310 pushes the movable contact piece 600 upward;

[0066] When the differential pressure diaphragm 300 protrudes toward the pressure-increasing chamber a, the valve stem 310 retracts into the valve hole 201 .

[0067] In this embodiment, to ensure the balance of the pressure differential diaphragm 300 , the inner diameter of the valve hole 201 is consistent with the inner diameter of the balance hole 104 , and the diameter and length of the valve stem 310 are consistent with the diameter and length of the balance rod 320 .

[0068] In addition, in order to prevent water from entering the valve hole 201 and the balance hole 104, thereby causing water leakage of the switch body, in this embodiment, the balance structure further includes a first waterproof cover 330 and a second waterproof cover 340 that are symmetrically arranged, wherein the first waterproof cover 330 is located outside the valve stem 310, and the second waterproof cover 340 is located outside the balance rod 320;

[0069] The first waterproof cover 330 and the second waterproof cover 340 are respectively supported by two inner end surfaces of the switch body.

[0070] In this embodiment, in order to ensure the sealing requirement, the two waterproof covers and the two inner end surfaces of the switch body are both interference fit;

[0071] Meanwhile, preferably, in the present embodiment, the valve stem 310, the balance bar 320, the first waterproof cover 330 and the second waterproof cover 340 are integrally formed with the pressure differential diaphragm and are made of the same silicone material.

[0072] When the pressure differential diaphragm bulges toward any one side, it will inevitably squeeze the waterproof cover on that side, causing the waterproof cover on that side to deform. At this time, due to the abutment between the waterproof cover and the inner wall of the switch body, in order to prevent the abutment force from affecting the deformation of the pressure differential diaphragm, in this embodiment, the outer periphery of the first waterproof cover 330 and the second waterproof cover 340 are both provided with waist-shaped grooves 301.

[0073] The waist-shaped groove 301 is arranged on the outer wall of the first waterproof cover 330 and the second waterproof cover 340, and the thickness of the waterproof cover in this part is relatively small. Therefore, when the pressure difference diaphragm protrudes toward any side, the waterproof platform on that side is squeezed. Since the thickness of the waterproof cover in the waist-shaped groove 301 part is small, the waterproof cover is bent and deformed in this part, thereby reducing the pressure on the pressure difference diaphragm, so that the pressure difference diaphragm can be deformed and protrude smoothly.

[0074] Since the first waterproof cover 330 and the second waterproof cover 340 are respectively arranged outside the valve stem 310 and the balance bar 320, in order to prevent them from blocking the moving path of the valve stem 310 or the balance bar 320 when deformed, in this embodiment, the pressurization chamber a is located between the pressure difference diaphragm 300 and the switch seat 100, and the pressure relief chamber b is located between the switch cover 200 and the pressure difference diaphragm 300; the moving contact piece 600 and the fixed contact piece 500 are arranged on the switch cover 200;

[0075] A first guide sleeve 210 is provided on the inner wall of the switch cover 200 extending toward the pressure relief chamber b; a second guide sleeve 110 symmetrical to the first guide sleeve 210 is provided on the bottom of the switch seat 100 toward the pressure boost chamber a.

[0076] Meanwhile, in this embodiment, the first waterproof sleeve 330 is sleeved on the outer circumference of the first guide sleeve 210;

[0077] The second waterproof sleeve 340 is sleeved on the outer circumference of the second guide sleeve 110 .

[0078] Meanwhile, the first guide sleeve 210 and the second guide sleeve 110 are respectively located on the outer edges of the valve hole 201 and the balance hole 104 .

[0079] Reference Figure 2 As shown, in this embodiment, the first waterproof cover 330 is disposed outside the first guide cover 210, and the second waterproof cover 340 is disposed outside the second waterproof cover 340;

[0080] At the same time, in order to prevent the two guide sleeves from blocking the deformation of the waterproof sleeve, in this embodiment, a space is left between the end of the second guide sleeve 110 and the pressure differential diaphragm, and a space is left between the end of the second guide sleeve 110 and the pressure differential diaphragm, and the position of the waist-shaped hole is outside the reserved space. When deformed, the waterproof sleeve can bend and deform toward the space position.

[0081] In addition, in this embodiment, the switch cover 200 and the switch base are configured as a detachable structure, and the specific implementation thereof is as follows: the end of the switch cover 200 can be inserted into the switch base 100 for connection, and is fixed by a snap ring 400 with a notch.

[0082] Reference Figures 5 to 7 As shown, the specific structure is: the outer wall of the switch cover 200 is provided with a slot 203 capable of accommodating the clamp ring 400, and the switch base 100 is provided with a plug hole 103;

[0083] The two ends of the snap ring 400 extend into the switch seat 100 through the insertion hole 103 and snap into the snap grooves 203 on the switch cover 200 .

[0084] As shown in the specific figure, two through holes arranged in the radial direction are opened on the side wall of the switch seat 100, and the through holes penetrate the inner cavity side of the switch seat 100. At the same time, a part of the switch cover 200 extends into the switch seat 100, and a slot 203 parallel to the through hole is provided on the outer wall of the extended part;

[0085] The snap ring 400 includes two straight sections at two ends and an arc section connecting the two straight sections. When understood, the end of the straight section is inserted from one end of the through hole, extends into the switch base 100 and engages with the slot 203 on the switch cover 200, and then passes through the other side of the through hole after engagement, thereby realizing the connection between the switch cover 200 and the switch base 100.

[0086] When the switch body is to be disassembled, the snap ring 400 is pulled out from the switch cover 200 by simply pulling the arc segment, so that the switch base 100 and the switch cover 200 can be separated.

[0087] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pressure differential switch structure for an instant water heater, comprising a switch body having an inner cavity formed by a switch base (100) and a switch cover (200), wherein a pressure differential diaphragm (300) is arranged in the switch body; the pressure differential diaphragm (300) divides the inner cavity into a pressure-increasing cavity (a) or a pressure-releasing cavity (b); and the pressure differential diaphragm (300) can protrude toward one side of the pressure-increasing cavity (a) or one side of the pressure-releasing cavity (b) under the action of hydraulic pressure; The pressure-increasing chamber (a) is connected to the first water inlet (101) and the second water outlet of the switch body, and the pressure-relieving chamber (b) is connected to the return port (202) of the switch body; The switch body is provided with a moving contact piece (600) and a fixed contact piece (500) connected to the water heater heating circuit, and the movable end of the moving contact piece (600) is driven by the pressure difference diaphragm (300) to contact or disengage with the fixed contact piece (500), thereby turning on or off the heating circuit; Features: It also includes a balance structure, which ensures that the pressure difference diaphragm (300) is always in a balanced position.

2. The pressure differential switch structure of the instant water heater according to claim 1, characterized in that: The balancing structure comprises a valve stem (310) and a balancing rod (320) arranged on both sides of the pressure differential diaphragm (300), and the switch body is symmetrically provided with a valve hole (201) and a balancing hole (104); The valve stem (310) extends from the first end surface of the pressure differential diaphragm (300) and extends out of the switch body through the valve hole (201) to support the movable contact piece (600); The balancing rod (320) extends into the balancing hole (104).

3. The pressure differential switch structure of the instant water heater according to claim 2, characterized in that: The balancing structure further comprises a first waterproof cover (330) and a second waterproof cover (340) which are symmetrically arranged, wherein the first waterproof cover (330) is located outside the valve stem (310), and the second waterproof cover (340) is located outside the balancing rod (320); The first waterproof cover (330) and the second waterproof cover (340) are respectively supported by two inner end surfaces of the switch body.

4. The pressure differential switch structure of the instant water heater according to claim 3, characterized in that: The outer circumferences of the first waterproof cover (330) and the second waterproof cover (340) are both provided with waist-shaped grooves (301).

5. The pressure difference switch structure of the instant water heater according to claim 3, characterized in that: The pressurizing chamber (a) is located between the pressure differential diaphragm (300) and the switch seat (100), and the pressure relief chamber (b) is located between the switch cover (200) and the pressure differential diaphragm (300); the moving contact piece (600) and the fixed contact piece (500) are arranged on the switch cover (200); A first guide sleeve (210) is provided on the inner wall of the switch cover (200) extending toward the pressure relief chamber (b); and a second guide sleeve (110) symmetrical to the first guide sleeve (210) is provided on the bottom of the switch seat (100) toward the pressure boost chamber (a).

6. The pressure difference switch structure of the instant water heater according to claim 5, characterized in that: The first waterproof sleeve (330) is sleeved on the outer circumference of the first guide sleeve (210); The second waterproof sleeve (340) is sleeved on the outer circumference of the second guide sleeve (110).

7. The pressure differential switch structure of the instant water heater according to claim 1, characterized in that: The pressure difference diaphragm (300) and the balance structure are integrally formed.

8. The pressure differential switch structure of the instant water heater according to claim 1, characterized in that: The end of the switch cover (200) can be inserted into the switch seat (100) for connection and fixed by a snap ring (400) with a notch.

9. The pressure difference switch structure of the instant water heater according to claim 8, characterized in that: The outer wall of the switch cover (200) is provided with a clamping groove (203) capable of accommodating the clamping ring (400) to extend therein, and the switch seat (100) is provided with a plug hole (103); The two ends of the snap ring (400) extend into the switch seat (100) through the insertion hole (103) and snap into engagement with the snap grooves (203) on the switch cover (200).

Images