CN215483312U

CN215483312U - Diaphragm expansion tank

Info

Publication number: CN215483312U
Application number: CN202121427746.2U
Authority: CN
Inventors: 汤亦根
Original assignee: Hangzhou Bright Electrical Appliance Co ltd
Current assignee: Hangzhou Yizheng Water Treatment Equipment Co ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-01-11
Anticipated expiration: 2031-06-25

Abstract

The utility model relates to a diaphragm expansion tank, which comprises two half tank bodies made of plastics, wherein each half tank body is provided with a butt joint port and an arc bottom, the butt joint ports of the two half tank bodies are opposite and are sealed and fixed by adopting a plastic welding mode, the bottom of the arc bottom is provided with a through hole, a valve inside is arranged at the through hole of one half tank body to form an air hole, and a threaded connecting column is arranged at the through hole of the other half tank body to form a water hole; the pressure tank is internally provided with a bowl-shaped inner membrane, the bowl opening of the inner membrane is turned outwards to form an inner membrane connecting edge, a pressure ring is arranged between the two half tank bodies, the pressure ring is clamped when the two half tank bodies are welded and fixed, the pressure ring extrudes the inner membrane connecting edge to form sealing connection, and the inner membrane divides the pressure tank into a water chamber and an air chamber which are mutually independent. Half jar of body adopts the plastics material to avoid water erosion, also need not protect at the inner wall, two pairs of interfaces adopt plastics welded mode relatively to carry out welded seal fixed, and is sealed effectual, and sealed back bulk strength is high, satisfies pressure balance needs, and long service life.

Description

Diaphragm expansion tank

Technical Field

The utility model belongs to the field of pressure containers, and particularly relates to a diaphragm expansion tank.

Background

The expansion tank is used in a closed water circulation system, plays a role in balancing water quantity and pressure, and avoids frequent opening of a safety valve and frequent water replenishing of an automatic water replenishing valve. The expansion tank can also play a role of a water replenishing tank besides the function of containing expansion water, after the water pump is started, water is supplied to a pipe network, redundant water is stored into the tank, the water level in the tank rises, air in the tank is compressed, and the pressure is increased accordingly. When the pressure in the tank reaches the specified upper limit pressure value, the upper limit contact is connected by the index of an electric contact pressure gauge communicated with the top of the tank through a pipeline, a signal is sent out, the power supply is cut off, and the pump is stopped.

The expansion tank is divided into an air bag type and a diaphragm type. The diaphragm type pressure tank can completely realize air-water separation, water is arranged on one side of the rubber diaphragm, and pre-charged air is arranged on the other side of the rubber diaphragm.

However, the inner part of the tank body of the membrane tank is directly contacted with water, so that in order to protect the tank body, an anti-rust layer is sprayed in the tank body, the interface of the tank body and the tank body are fixed in a welding mode, and the inner membrane of the membrane tank is fixed between carbon steels of the two tank bodies in a hot rolling mode. The pressure in the diaphragm tank can be higher, so the fixed sealed technology requirement of inner membrance is higher, if processing technology does not reach standard, leave the micropore between inner membrance and carbon steel easily, cause diaphragm tank pressure to descend, the effect of balanced water yield and pressure descends, still can cause the water pump to frequently open and stop for the operation of water pump receives the interference, still can influence the life of water pump when serious.

Disclosure of Invention

The utility model solves the defects that the existing pressure tank is formed by welding carbon steel, the inner membrane and the carbon steel are fixed by hot rolling, welding micropores are easily left at the hot rolling part of a welding machine, the pressure is reduced, the capacity of regulating the water quantity and the pressure of the pressure tank is influenced, and the normal work and the service life of a water pump are further influenced.

The specific technical scheme of the utility model is as follows: a diaphragm expansion tank comprises two half tank bodies made of plastics, wherein each half tank body is provided with a butt joint port and an arc bottom, the butt joint ports of the two half tank bodies are opposite and are sealed and fixed in a plastic welding mode, the bottom of the arc bottom is provided with a through hole, a valve core is arranged at the through hole of one half tank body to form an air hole, and a threaded connecting column is arranged at the through hole of the other half tank body to form a water hole; the pressure tank is internally provided with a bowl-shaped inner membrane, the bowl opening of the inner membrane is turned outwards to form an inner membrane connecting edge, a pressure ring is arranged between the two half tank bodies, the pressure ring is clamped when the two half tank bodies are welded and fixed, the pressure ring extrudes the inner membrane connecting edge to form sealing connection, and the inner membrane divides the pressure tank into a water chamber and an air chamber which are mutually independent.

The two half tank bodies are made of plastics, the strength of the plastics can bear the pressure set by the pressure tank, the half tank bodies are made of plastics, so that water erosion is avoided, the inner wall does not need to be protected, after the plastics are made, the two pairs of interfaces are welded, sealed and fixed relatively in a plastic welding mode, the sealing effect is good, the overall strength is high after sealing, the requirement of pressure balance is met, and the service life is long; the two half tank bodies are oppositely welded and fixed, a cavity is formed in the cavity, the bowl-shaped inner membrane is arranged in the cavity, the bowl opening of the inner membrane is positioned at the position opposite to the butt joint openings of the two half tank bodies, so that the cavity is divided into an independent water chamber and an independent air chamber by the inner membrane, the separation position of the water chamber and the air chamber is an inner membrane connecting edge formed by turning over the bowl opening of the inner membrane, when the two half tank bodies are welded, the butt joint openings are opposite and clamp a pressing ring and the inner membrane connecting edge, and the defect that micropores are left in hot rolling of the inner membrane is avoided by adopting the extrusion sealing mode.

Preferably, the butt joint port is provided with a radial ring surface and a conical surface, the radial ring surfaces of the butt joint ports of the two half tank bodies are axially opposite, and the conical surfaces of the butt joint ports of the two half tank bodies are matched with each other; the butt joints of the two half tank bodies are relatively rotated, extruded and welded. The two pairs of interfaces are provided with radial ring surfaces and conical surfaces, and after welding and fixing, sealing parts are formed on the radial ring surfaces and the conical surfaces, so that the welding sealing property is improved.

Preferably, the inner wall of the butt joint port of the half tank body corresponding to the air chamber is provided with an axially extending positioning ring, a concave part is formed between the positioning ring and the conical surface of the butt joint port, and the cross section of the concave part is trapezoidal; the half tank body butt joint port corresponding to the water chamber is provided with a convex part extending axially, the cross section of the convex part is trapezoidal, the conical surface of the half tank body butt joint port is positioned on the outer side surface of the convex part, and the convex part is matched with the concave part. After the inner wall of the butt joint of the half tank body is provided with the positioning ring, a concave part can be formed between the positioning ring and the conical surface, the corresponding position of the other half tank body is provided with an extended convex part, when the two half tank bodies are welded and fixed relatively, the convex part is matched with the concave part, simultaneously, the conical surface is relative, along with axial position calibration, the fitting of the two conical surfaces is tighter, and meanwhile, the positioning ring also performs radial limitation on the convex part.

Further preferably, the inner wall that corresponds the half jar of body butt joint mouth of hydroecium sets up round tooth protruding, forms axial concave ring between the inside wall of tooth protruding and convex part, and tooth protruding transversal personally submits the triangle-shaped form, forms the sealed extrusion groove of inner membrance connection limit between the holding ring of tooth protruding and the second half jar of body, clamping ring and inner membrance connection limit be in sealed extrusion inslot. The tooth convex is opposite to the positioning ring, and after the two tank bodies are welded and fixed, a sealing extrusion groove is just formed at the position, so that the inner membrane connecting edge of the inner membrane bowl with the outwards turned mouth just has a position for accommodating.

Further preferably, the bowl opening of the inner membrane is turned outwards and then forms a clamping groove at the inward-folded part, and the cross section shape of the clamping groove is matched with that of the dental arch. The shape of pressing from both sides the groove and the shape looks adaptation of odontoid, the fixed back of inner membrance, the odontoid inserts and presss from both sides the inslot, and the clamping ring compresses tightly the back, and the inner membrance is connected the limit and can not remove, and axial extrusion force makes the contact between inner membrance connection limit and the odontoid inseparabler simultaneously, and the leakproofness is good.

Further preferably, the clamping ring is annular, one axial end is an extrusion flat end, the other axial end is an inwards concave clamping portion, the clamping portion is matched with an inner membrane connecting edge of the inner membrane bowl opening, and the inner membrane connecting edge is clamped into the inwards concave portion of the clamping portion.

Further preferably, the outer side surface of the pressing ring is provided with a limiting bump, the inner side surface of the corresponding half tank body is provided with a limiting groove, and the limiting bump is matched with the limiting groove. The limiting convex block is matched with the limiting groove to limit the rotation of the pressing ring.

Preferably, the threaded connecting column is divided into two sections, the middle of the threaded connecting column is divided by a rectangular ring, one section is a threaded section, the other section is a parallel sawtooth section, the parallel sawtooth section is embedded into the bottom of the half tank body, and the threaded section is exposed out of the bottom of the half tank body. The parallel sawtooth sections are matched with the bottoms of the half tank bodies in an embedded mode, forming is convenient, and the stability of the pressure tank can be guaranteed after the threaded connecting columns are connected.

Preferably, the bottom of the half tank body corresponding to the water chamber is provided with a convex column, the water hole is arranged in the center of the convex column, and the threaded connecting column is embedded into the convex column; the end face of the convex column is provided with a sinking platform, the end face of the rectangular ring is flush with the bottom surface of the sinking platform, a sealing ring is clamped in the sinking platform, and the sealing ring is sleeved outside the thread section of the thread connecting column. The convex column increases the thickness of the bottom of the half tank body, and the stability is good when the threaded connecting column is integrally formed.

Preferably, the inner wall of the bottom of the half tank body corresponding to the air chamber is provided with an inward convex inner column, the convex inner column is concentric with the through hole, and the valve core extends into the wall of the convex inner column; the periphery of the convex inner column and the bottom of the half tank body form an air chamber limiting pressurization cavity. The air chamber limits the pressurizing cavity, so that when the inner membrane moves reversely, the air chamber has enough space, and if the inner membrane moves too much, the convex inner column can support the bottom of the inner membrane.

The utility model has the beneficial effects that: the two half tank bodies are made of plastics, the strength of the plastics can bear the pressure set by the pressure tank, the half tank bodies are made of plastics, so that water erosion is avoided, the inner wall does not need to be protected, after the plastics are made, the two pairs of interfaces are welded, sealed and fixed relatively in a plastic welding mode, the sealing effect is good, the overall strength is high after sealing, the requirement of pressure balance is met, and the service life is long; the two half tank bodies are oppositely welded and fixed, a cavity is formed in the cavity, the bowl-shaped inner membrane is arranged in the cavity, the bowl opening of the inner membrane is positioned at the position opposite to the butt joint openings of the two half tank bodies, so that the cavity is divided into an independent water chamber and an independent air chamber by the inner membrane, the separation position of the water chamber and the air chamber is an inner membrane connecting edge formed by turning over the bowl opening of the inner membrane, when the two half tank bodies are welded, the butt joint openings are opposite and clamp a pressing ring and the inner membrane connecting edge, and the defect that micropores are left in hot rolling of the inner membrane is avoided by adopting the extrusion sealing mode.

Drawings

FIG. 1 is a schematic diagram of one configuration of the present invention;

FIG. 2 is a schematic view of another angle configuration of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of the separation of a pressure ring from an inner membrane in accordance with the present invention;

FIG. 5 is an enlarged cross-sectional view taken at I of the structure of FIG. 4 in accordance with the present invention;

FIG. 6 is a schematic view of a threaded post according to the present invention;

in the figure: 1. the gas semi-tank body, 2, thickened part, 3, reinforcing rib, 4, water semi-tank body, 5, dust cover, 6, sealing cover, 7, convex column, 8, sealing ring, 9, water hole, 10, thread connecting column, 11, concave part, 12, conical surface, 13, radial plane, 14, tooth convex, 15, pressing ring, 16, inner membrane, 17, sinking platform, 18, thread section, 19, concave ring, 20, convex part, 21, positioning ring, 22, convex inner column, 23, air chamber limiting pressurizing cavity, 24, valve core, 25, air hole, 26, outer clamping edge, 27, clamping part, 28, inner clamping edge, 29, inclined transition part, 30, inner membrane connecting edge, 31, limiting bump, 32, clamping groove, 33, parallel saw tooth section, 34, radial groove, 35, radial inner bump, 36 and rectangular ring.

Detailed Description

The utility model is further described by the following specific embodiments in conjunction with the accompanying drawings.

Example (b):

as shown in figure 1, figure 2 and figure 3, the diaphragm expansion tank comprises two half tank bodies made of high-strength plastics, wherein the two half tank bodies are respectively a gas half tank body 1 and a water half tank body 4, each half tank body is provided with a butt joint port and an arc bottom, the butt joint ports of the two half tank bodies are opposite and are sealed and fixed in a plastic welding mode, the bottom of the arc bottom is provided with a through hole, a valve core 24 is arranged at the through hole of the gas half tank body to form an air hole 25, and a sealing cover is sleeved outside the water hole. The through hole of the water semi-tank body is provided with a threaded connecting column 10 to form a water hole 9, and a dust cover is sleeved outside the water hole. A bowl-shaped inner membrane 16 is arranged in the pressure tank, the bowl opening of the inner membrane is turned outwards to form an inner membrane connecting edge 30, a pressing ring 15 is arranged between the two tank halves, the pressing ring is clamped when the two tank halves are welded and fixed, the pressing ring extrudes the inner membrane connecting edge to form sealing connection, and the inner membrane divides the pressure tank into a water chamber and an air chamber which are mutually independent.

The gas half tank body and the water half tank body are similar in appearance and comprise a section of column ring and an arc bottom, and the butt joint is positioned at the end part of the column ring. To the wall thickness increase formation thickening portion 2 of interface, set up strengthening rib 3 between the outer wall of thickening portion and post circle, the strengthening rib is 4, and 4 says that the strengthening rib is central symmetry and arranges.

The butt joint port has radial ring surface 13 and conical surface 12, the radial ring surfaces of the butt joint ports of the two half tank bodies are axially opposite, and the conical surfaces of the butt joint ports of the two half tank bodies are mutually matched. The inner wall of the butt joint port of the gas semi-tank body is provided with a positioning ring 21 which extends axially, a concave part 11 is formed between the positioning ring and the conical surface of the butt joint port, and the cross section of the concave part is trapezoidal. The water half tank body butt joint port is provided with a convex part 20 which extends axially, the cross section of the convex part is trapezoidal, the conical surface of the water half tank body butt joint port is positioned on the outer side surface of the convex part, and the shapes of the convex part and the concave part are complementary. The butt joints of the gas half tank body and the water half tank body are opposite, the convex part is inserted into the concave part, the radial ring surfaces are opposite, the conical surfaces are opposite, and the butt joints of the two half tank bodies are relatively rotated, extruded and welded. The inner wall of the butt joint of the half tank body is provided with a circle of dental protrusions 14, an axial concave ring 19 is formed between the dental protrusions and the inner side wall of the convex part, the cross section of each dental protrusion is triangular, a sealing extrusion groove of an inner membrane connecting edge is formed between each dental protrusion and the positioning ring of the other half tank body, and the pressing ring and the inner membrane connecting edge are located in the sealing extrusion groove. As shown in figure 4 and figure 5, the inner membrane bowl is turned outwards and then forms a clamp groove 32 at the inward-folded part, and the cross section shape of the clamp groove is matched with that of the dental arch. After the inner membrane is placed, the tooth protrusions are inserted into the clamping grooves, and after the pressing ring is pressed tightly, the connecting edges of the inner membrane cannot move. The inner membrane is provided with an inclined transition part 29 at a position close to the opening part, and the inclined transition part enables the periphery of the inner membrane to be in a reducing shape, so that a gap is formed between the outer wall of the inner membrane and the inner wall of the water half tank body. The clamping ring is annular, one axial end is an extrusion flat end, the other axial end is an inwards concave clamping portion 27, the clamping portion is matched with an inner membrane connecting edge of the inner membrane bowl opening, and the inner membrane connecting edge is clamped into the inwards concave portion of the clamping portion. The inner clamping edge 28 is formed radially inside the clamping portion, the outer clamping edge 26 is formed radially outside the clamping portion, the inner clamping edge extends into the bowl mouth of the inner membrane after the inner membrane connecting edge is clamped into the clamping portion, and the outer clamping edge wraps the outer side of the inner membrane connecting edge. The outer side surface of the outer clamping edge of the pressing ring is provided with a limiting lug 31, the inner side surface of the corresponding half tank body is provided with a limiting groove (not shown in the figure), and the limiting lug is matched with the limiting groove.

The bottom of the water tank body is provided with a convex column 7, the water hole is arranged in the center of the convex column, the threaded connecting column is embedded into the convex column, and the diameter of the inner hole of the threaded connecting column is larger than that of the water hole. The end face of the convex column is provided with a sinking platform 17, the end face of the rectangular ring is flush with the bottom surface of the sinking platform, a sealing ring 8 is clamped in the sinking platform, and the sealing ring is sleeved outside the thread section of the thread connecting column. As shown in fig. 6, the threaded connection column is divided into two sections, the middle is divided by a rectangular ring 36, one section is a threaded section 18, the other section is a parallel sawtooth section 33, the parallel sawtooth section is embedded in the bottom of the water half tank body, and the threaded section is exposed out of the bottom of the half tank body. The end part of the threaded connecting column, which is embedded into the water half tank body, is provided with 6 radial grooves 34, the inner wall of the end part of the threaded connecting column is provided with radial inward convex blocks 35 which are protruded radially inwards, the radial inward convex blocks are rectangular, the number of the radial inward convex blocks is 3, the 3 radial inward convex blocks are arranged in a central symmetry manner, the positions of the radial inward convex blocks correspond to the corresponding radial grooves, and the radial inward convex blocks seal the inner end parts of the corresponding radial grooves. When the threaded connecting column and the water semi-tank body are integrally formed, the parallel sawtooth sections and the rectangular rings are both positioned in the convex columns.

The inner wall of the bottom of the gas semi-tank body is provided with a convex inner column 22 which protrudes inwards, the convex inner column is concentric with the through hole, and the valve core extends into the wall of the convex inner column. The periphery of the convex inner column and the bottom of the gas semi-tank body form a gas chamber limiting pressurizing cavity 23.

The inner film and the pressing ring are combined and then placed at the butt joint position of the water half tank body, the gas half tank body is opposite to the butt joint position of the water half tank body, the limiting lug is matched with the limiting groove, the water half tank body and the gas half tank body rotate relatively to be extruded and welded, the pressing ring is propped against the positioning ring, then the gas chamber is inflated through the gas hole, and the sealing cover is sleeved outside the gas hole after the design pressure is reached.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A diaphragm expansion tank is characterized by comprising two half tank bodies made of plastics, wherein each half tank body is provided with a butt joint and an arc bottom, the butt joint of the two half tank bodies is opposite and is sealed and fixed by adopting a plastic welding mode, the bottom of the arc bottom is provided with a through hole, a valve core (24) is arranged at the through hole of one half tank body to form an air hole (25), and a threaded connecting column (10) is arranged at the through hole of the other half tank body to form a water hole (9); a bowl-shaped inner membrane (16) is arranged in the pressure tank, the bowl opening of the inner membrane is turned outwards to form an inner membrane connecting edge (30), a pressing ring (15) is arranged between the two tank halves, the pressing ring is clamped when the two tank halves are welded and fixed, the pressing ring extrudes the inner membrane connecting edge to form sealing connection, and the inner membrane divides the pressure tank into a water chamber and an air chamber which are mutually independent.

2. A membrane expansion tank according to claim 1, wherein the abutment has radial ring surfaces and conical surfaces, the radial ring surfaces of the abutment of the two tank halves being axially opposed, the conical surfaces of the abutment of the two tank halves cooperating with each other; the butt joints of the two half tank bodies are relatively rotated, extruded and welded.

3. A membrane expansion tank according to claim 2, characterized in that the inner wall of the half tank body butt joint opening corresponding to the air chamber is provided with an axially extending positioning ring (21), a concave part (11) is formed between the positioning ring and the conical surface of the butt joint opening, and the cross section of the concave part is trapezoidal; the half tank body butt joint port corresponding to the water chamber is provided with a convex part (20) extending axially, the cross section of the convex part is trapezoidal, the conical surface of the half tank body butt joint port is positioned on the outer side surface of the convex part, and the convex part is matched with the concave part.

4. A diaphragm expansion tank according to claim 3, wherein a circle of tooth protrusion (14) is arranged on the inner wall of the butt joint of the half tank body corresponding to the water chamber, an axial concave ring (19) is formed between the tooth protrusion and the inner side wall of the convex part, the cross section of the tooth protrusion is triangular, a sealing extrusion groove of the inner film connecting edge is formed between the tooth protrusion and the positioning ring of the other half tank body, and the pressing ring and the inner film connecting edge are positioned in the sealing extrusion groove.

5. A membrane expansion tank according to claim 4, characterized in that the inner membrane bowl is turned outwards and then formed with a clamp groove (32) at the folded-in position, the cross-sectional shape of the clamp groove being adapted to the cross-sectional shape of the tooth-like protrusion.

6. A membrane expansion tank according to claim 1 or 2 or 3 or 4 or 5, characterized in that the press ring is ring-shaped, one axial end is a flat end, the other axial end is a concave clamping portion (27), the clamping portion is matched with the inner membrane connecting edge of the inner membrane bowl mouth, and the inner membrane connecting edge is clamped into the concave part of the clamping portion.

7. A membrane expansion tank according to claim 6, characterized in that the outer surface of the pressure ring is provided with a limiting projection (31), the inner surface of the corresponding half tank is provided with a limiting groove, and the limiting projection and the limiting groove are matched with each other.

8. A membrane expansion tank according to claim 1, 2, 3, 4 or 5, characterized in that the threaded connection column is divided into two sections, the middle is divided by a rectangular ring (36), one section is a threaded section (18), the other section is a parallel sawtooth section (33), the parallel sawtooth section is embedded in the bottom of the half tank body, and the threaded section is exposed out of the bottom of the half tank body.

9. The membrane expansion tank as claimed in claim 8, wherein the bottom of the half tank body corresponding to the water chamber is provided with a convex column (7), the water hole is arranged at the center of the convex column, and the threaded connecting column is embedded into the convex column; the end face of the convex column is provided with a sinking platform (17), the end face of the rectangular ring is flush with the bottom surface of the sinking platform, a sealing ring (8) is clamped in the sinking platform, and the sealing ring is sleeved outside the thread section of the thread connecting column.

10. A membrane expansion tank according to claim 1 or 2 or 3 or 4 or 5, characterized in that the inner wall of the bottom of the tank half corresponding to the air chamber is provided with an inwardly convex inner column (22), the convex inner column is concentric with the through hole, and the valve core extends into the wall of the convex inner column; the periphery of the convex inner column and the bottom of the half tank body form an air chamber limiting pressurization cavity (23).