CN215594245U

CN215594245U - Diaphragm expansion tank

Info

Publication number: CN215594245U
Application number: CN202121619836.1U
Authority: CN
Inventors: 赵跃; 李福明; 李小江
Original assignee: Zhejiang Yaoda Intelligent Sci Tech Co ltd
Current assignee: Zhejiang Yaoda Intelligent Sci Tech Co ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-01-21
Anticipated expiration: 2031-07-16

Abstract

The utility model provides a diaphragm expansion tank, and belongs to the technical field of machinery. The diaphragm expansion tank solves the problems that the existing diaphragm expansion tank is easy to leak and has short service life. The diaphragm expansion tank comprises an upper tank body, a diaphragm and a lower tank body, wherein the diaphragm divides a cavity formed by the upper tank body and the lower tank body into an air cavity and a liquid cavity, the middle part of the lower tank body is provided with a threaded joint, the inner end of the threaded joint is communicated with the liquid cavity, the upper end of the upper tank body is provided with an air valve core, the outer end of the diaphragm is an annular connecting part, a clamping ring is arranged between the inner side wall of the upper tank body and the connecting part, the clamping ring abuts against the connecting part, the clamping ring and the connecting part are extruded between the upper tank body and the lower tank body, the lower end face of the clamping ring abuts against the upper end face of the connecting part, and the upper tank body and the lower tank body are made of high polymer materials. The diaphragm expansion tank has the advantages of difficult leakage and long service life.

Description

Diaphragm expansion tank

Technical Field

The utility model belongs to the technical field of machinery, and relates to an expansion tank, in particular to a diaphragm expansion tank.

Background

The water supply diaphragm expansion tank is widely applied to a water supply system and comprises an air bag type diaphragm expansion tank and a diaphragm type diaphragm expansion tank which are welded, so that the manufacturing is complex, the problems of diaphragm rupture, air leakage and the like occur in the use process, the reason is that in the manufacturing process of the diaphragm expansion tank, two butted shells need to be welded into a complete upper tank body, so that the diaphragm needs to be added into the shell and then welded, in order to ensure that an air bag part has enough space, the diaphragm is usually arranged in the middle of the diaphragm expansion tank and is close to the welding position of the shell, but the heat generated in the welding process tends to damage the diaphragm, so that the service lives of the diaphragm and the diaphragm expansion tank are shortened, and the diaphragm is arranged in the diaphragm expansion tank, so that an inner pressing ring is required to press the diaphragm on the inner wall of the diaphragm expansion tank in the conventional technology, this step is difficult to perform practically in order to make the membrane have good sealing properties under strong pressure.

The diaphragm type expansion tank (application number: 201820892613.4) for water supply and drainage, as disclosed in the Chinese patent document, comprises a water storage tank, an air inlet valve, a water inlet and outlet device and a diaphragm, wherein the air inlet valve, the water inlet and outlet device and the diaphragm are arranged on the water storage tank, the water storage tank comprises an upper tank body and a lower upper tank body, the upper tank body and the lower upper tank body are buckled with each other to form a sealed water storage tank, connecting blocks are arranged at the buckling parts of the upper tank body and the lower upper tank body, the diaphragm is clamped between the connecting blocks, and the upper tank body and the lower tank body are hermetically connected through a locking device by the connecting blocks. However, the diaphragm type diaphragm expansion tank is not long in service life because leakage is likely to occur after long-term use.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a polymer diaphragm type environment-friendly diaphragm expansion tank which is not easy to leak and has long service life.

The purpose of the utility model can be realized by the following technical scheme: a diaphragm expansion tank comprises an upper tank body, a diaphragm and a lower tank body, wherein the diaphragm divides a cavity formed by the upper tank body and the lower tank body into an air cavity and a liquid cavity, the middle part of the lower tank body is provided with a threaded joint, the inner end of the threaded joint is communicated with the liquid cavity, and the upper end of the upper tank body is provided with an air valve core.

Pressure gas is filled into the air cavity through the air valve core, and when the air valve is used, the air valve is connected to a water system through a threaded connector. When the pressure of the water system is greater than the pressure in the air cavity, the pressure of the water system extrudes the diaphragm, the volume of the air cavity is reduced, and the pressure is increased; when the pressure of the water system is smaller than the pressure in the air cavity, the diaphragm extrudes the water in the liquid cavity and replenishes the water into the water system, so that the pressure of the water system is increased, and the air cavity and the liquid cavity reach new balance to play a role in adjusting the pressure fluctuation of the water system. Because go up the jar body and lower jar body adopt macromolecular material to make, have the advantage of difficult rust and long service life, the buckle ring leans on and buckle ring and connecting portion extrude between last jar body and lower jar body with connecting portion counterbalance, the lower terminal surface of buckle ring pastes with the up end of connecting portion mutually and leans on to form sealedly, has sealed effect better difficult production leakage, has improved life.

In the above diaphragm expansion tank, the upper end surface of the snap ring is coaxially provided with a first annular protrusion and a second annular protrusion, the first annular protrusion is located on the outer side of the first annular protrusion, and the first annular protrusion and the second annular protrusion form a first annular groove.

In the diaphragm expansion tank, the upper end surface of the lower tank body is coaxially provided with a third annular convex body and a fourth annular convex body, the fourth annular convex body is positioned on the outer side of the third annular convex body, and the third annular convex body and the fourth annular convex body form a second annular groove.

In the above diaphragm expansion tank, the lower end surface of the upper tank body is coaxially provided with an annular convex body five and an annular convex body six, the annular convex body six is positioned on the outer side of the annular convex body five, the annular convex body six and the annular convex body five form an annular groove three, the annular convex body five is embedded in the annular groove one, the annular convex body six is embedded in the annular groove two, and the annular convex body two and the annular convex body three are embedded in the annular groove three. By adopting the arrangement, the upper tank body and the lower tank body have the advantages of good positioning effect and firm connection.

In the diaphragm expansion tank, an annular convex body seven is annularly arranged on the inner side wall of the upper end of the lower tank body, the annular convex body seven is positioned on the inner side of the annular convex body three in the axial direction, an annular groove four is formed between the annular convex body seven and the inner side wall of the lower tank body, an annular convex body eight is arranged on the inner end face of the outer end of the connecting part, and the annular convex body eight is embedded in the annular groove four. By adopting the structure, the sealing structure has better sealing effect and better connecting effect, and the service life is prolonged.

In foretell diaphragm expansion tank, the inside wall lateral wall of the lower jar of body be equipped with a plurality of location breachs that run through, the lateral wall of buckle ring be equipped with a plurality ofly with location breach assorted location convex body just location convex body inlay in the location breach that corresponds. Adopt above-mentioned setting, avoid buckle ring relative lower jar of body to deflect, have the better and firm in connection's of location effect advantage, the setting of location breach is on annular convex body three.

In the diaphragm expansion tank, the two outer side walls of the annular convex body six are conical surfaces I, the two inner side walls of the annular groove II are conical surfaces II, and the conical surfaces I are attached to the corresponding conical surfaces II. Adopt above-mentioned setting, have sealed better and firm in connection's of effect advantage.

In the diaphragm expansion tank, the annular convex body six is fixedly connected with the annular groove II through spin-melt welding. By adopting the arrangement, the sealing device has the advantages of good sealing effect, difficulty in leakage and convenience in manufacturing.

In the diaphragm expansion tank, the threaded joint and the Faraday cover are integrated into a whole through injection molding. Adopt above-mentioned setting, have sealed better and the firm reliable advantage of structure of effect.

Compared with the prior art, this diaphragm expansion tank has following advantage:

1. the upper tank body and the lower tank body are made of high polymer materials, so that the upper tank body and the lower tank body are difficult to rust and have long service life;

2. the outer side wall of the clamping ring is provided with a plurality of positioning convex bodies matched with the positioning notches, and the positioning convex bodies are embedded in the corresponding positioning notches, so that the clamping ring is prevented from deflecting relative to the lower tank body, and the clamping ring has the advantages of good positioning effect and firm connection;

3. the inner end face of the outer end of the connecting portion is provided with the annular convex body eight embedded in the annular groove four, so that the sealing structure has a good sealing effect and a good connecting effect, and the service life is prolonged.

4. The upper tank body and the lower tank body are fixedly connected through the spin-melt welding, so that the sealing structure has the advantages of good sealing effect, difficulty in leakage and convenience in manufacturing.

Drawings

FIG. 1 is a schematic front view of a membrane expansion tank.

Fig. 2 is a schematic sectional view a-a of fig. 1.

Fig. 3 is a schematic sectional view B-B of fig. 2.

Fig. 4 is a partially enlarged schematic view of C of fig. 2.

In the figure, 1, an upper tank body; 2. a diaphragm; 2a, a connecting part; 3. a tank body is arranged; 3a, positioning a notch; 4. an air cavity; 5. a liquid chamber; 6. a threaded joint; 7. a gas valve core; 8. a snap ring; 8a, positioning convex bodies; 9. a first annular convex body; 10. a second annular convex body; 11. a third annular convex body; 12. a ring-shaped convex body IV; 13. a fifth annular convex body; 14. a sixth annular convex body; 15. a seventh annular convex body; 16. an annular convex body eight; 17. a first annular groove; 18. a second annular groove; 19. a third annular groove; 20. and a fourth annular groove.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 4, a diaphragm expansion tank comprises an upper tank body 1, a diaphragm 2 and a lower tank body 3, wherein the diaphragm 2 divides a cavity formed by the upper tank body 1 and the lower tank body 3 into an air cavity 4 and a liquid cavity 5, a threaded joint 6 is arranged in the middle of the lower tank body 3, the inner end of the threaded joint 6 is communicated with the liquid cavity 5, an air valve core 7 is arranged at the upper end of the upper tank body 1, the outer end of the diaphragm 2 is an annular connecting part 2a, a snap ring 8 is arranged between the inner side wall of the upper tank body 1 and the connecting part 2a, the snap ring 8 abuts against the connecting part 2a, the snap ring 8 and the connecting part 2a are extruded between the upper tank body 1 and the lower tank body 3, the lower end face of the snap ring 8 abuts against the upper end face of the connecting part 2a, and the upper tank body 1 and the lower tank body 3 are made of high polymer materials. The upper end face of the snap ring 8 is coaxially provided with a first annular convex body 9 and a second annular convex body 10, the second annular convex body 10 is positioned on the outer side of the first annular convex body 9, and the first annular convex body 9 and the second annular convex body 10 form a first annular groove 17. The upper end surface of the lower tank body 3 is coaxially provided with a third annular convex body 11 and a fourth annular convex body 12, the fourth annular convex body 12 is positioned at the outer side of the third annular convex body 11, and the third annular convex body 11 and the fourth annular convex body 12 form a second annular groove 18.

The lower end face of the upper tank body 1 is coaxially provided with an annular convex body five 13 and an annular convex body six 14, the annular convex body six 14 is positioned on the outer side of the annular convex body five 13, the annular convex body six 14 and the annular convex body five 13 form an annular groove three 19, the annular convex body five 13 is embedded in the annular groove one 17, the annular convex body six 14 is embedded in the annular groove two 18, and the annular convex body two 10 and the annular convex body three 11 are embedded in the annular groove three 19.

The inside wall ring of the upper end of the lower tank body 3 is provided with seven 15 annular convex bodies, seven 15 annular convex bodies are positioned at the axial inner sides of three 11 annular convex bodies, four 20 annular grooves are formed between seven 15 annular convex bodies and the inside wall of the lower tank body 3, eight 16 annular convex bodies are arranged on the inner end face of the outer end of the connecting part 2a, eight 16 annular convex bodies are embedded in four 20 annular grooves, a good sealing effect and a good connecting effect are achieved, and the service life is prolonged.

The lateral wall of the inner side wall of the lower tank body 3 is provided with a plurality of through positioning notches 3a, the outer side wall of the snap ring 8 is provided with a plurality of positioning convex bodies 8a matched with the positioning notches 3a, and the positioning convex bodies 8a are embedded in the corresponding positioning notches 3a, so that the snap ring 8 is prevented from deflecting relative to the lower tank body 3, the advantages of good positioning effect and firm connection are achieved, and the positioning notches 3a are arranged on the third annular convex body 11.

Two outer side walls of the six annular convex bodies 14 are conical surfaces I, two inner side walls of the second annular grooves 18 are conical surfaces II, and the conical surfaces I are attached to the corresponding conical surfaces II, so that the sealing effect is good, and the connection is firm. The six annular convex bodies 14 are fixedly connected with the second annular groove 18 through spin-melt welding, so that the sealing structure has the advantages of good sealing effect, difficulty in leakage and convenience in manufacturing.

The screwed joint 6 and the Faraday cover are of an integrated structure through injection molding, and the integrated structure has the advantages of good sealing effect and firm and reliable structure.

Pressure gas is filled into the air cavity 4 through the air valve core 7, and when the air valve is used, the air valve is connected to a water system through the threaded connector 6. When the pressure of the water system is greater than the pressure in the air cavity 4, the pressure of the water system extrudes the diaphragm 2, the volume of the air cavity 4 is reduced, and the pressure is increased; when the pressure of the water system is smaller than the pressure in the air cavity 4, the diaphragm 2 extrudes the water in the liquid cavity 5 and replenishes the water into the water system, so that the pressure of the water system is increased, and the pressure fluctuation of the water system is adjusted when the air cavity 4 and the liquid cavity 5 reach new balance. The upper tank body 1 and the lower tank body 3 are made of PP high polymer materials, and the snap ring 8 is made of PT materials. Preferably, the upper tank 1 and the lower tank 3 are made of PE, and alternatively, the upper tank 1 and the lower tank 3 are made of PP and PE mixed material. The upper tank body 1, the lower tank body 3 and the snap ring 8 are made of high polymer materials and have the advantages of being difficult to rust and long in service life, the snap ring 8 abuts against the connecting portion 2a, the snap ring 8 and the connecting portion 2a are extruded between the upper tank body 1 and the lower tank body 3, the lower end face of the snap ring 8 is attached to the upper end face of the connecting portion 2a to form sealing, the sealing effect is good, leakage is difficult to generate, and the service life is prolonged.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although the terms of the upper tank 1, the diaphragm 2, the connecting portion 2a, the lower tank 3, the positioning notch 3a, the air chamber 4, the liquid chamber 5, the nipple 6, the air valve core 7, the snap ring 8, the positioning boss 8a, the annular boss one 9, the annular boss two 10, the annular boss three 11, the annular boss four 12, the annular boss five 13, the annular boss six 14, the annular boss seven 15, the annular boss eight 16, the annular groove one 17, the annular groove two 18, the annular groove three 19, the annular groove four 20, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A diaphragm expansion tank comprises an upper tank body (1), a diaphragm (2) and a lower tank body (3), wherein the diaphragm (2) divides a cavity formed by the upper tank body (1) and the lower tank body (3) into an air cavity (4) and a liquid cavity (5), the middle part of the lower tank body (3) is provided with a threaded joint (6), the inner end of the threaded joint (6) is communicated with the liquid cavity (5), the upper end of the upper tank body (1) is provided with an air valve core (7), the diaphragm expansion tank is characterized in that the outer end of the diaphragm (2) is an annular connecting part (2a), a clamping ring (8) is arranged between the inner side wall of the upper tank body (1) and the connecting part (2a), the clamping ring (8) is abutted against the connecting part (2a), and the clamping ring (8) and the connecting part (2a) are extruded between the upper tank body (1) and the lower tank body (3), the lower end surface of the snap ring (8) is attached to the upper end surface of the connecting part (2a), and the upper tank body (1) and the lower tank body (3) are made of high polymer materials.

2. A membrane expansion tank according to claim 1, characterized in that the upper end face of said snap ring (8) is coaxially provided with a first annular projection (9) and a second annular projection (10), said second annular projection (10) being located outside said first annular projection (9), said first annular projection (9) and said second annular projection (10) forming a first annular groove (17).

3. A membrane expansion tank according to claim 2, characterized in that the upper end surface of said lower tank body (3) is coaxially provided with a third annular projection (11) and a fourth annular projection (12), said fourth annular projection (12) being located outside said third annular projection (11), said third annular projection (11) and said fourth annular projection (12) forming a second annular groove (18).

4. A diaphragm expansion tank according to claim 3, wherein the lower end surface of the upper tank body (1) is coaxially provided with a fifth annular convex body (13) and a sixth annular convex body (14), the sixth annular convex body (14) is positioned outside the fifth annular convex body (13), the sixth annular convex body (14) and the fifth annular convex body (13) form a third annular groove (19), the fifth annular convex body (13) is embedded in the first annular groove (17), the sixth annular convex body (14) is embedded in the second annular groove (18), and the second annular convex body (10) and the third annular convex body (11) are embedded in the third annular groove (19).

5. A diaphragm expansion tank according to claim 3 or 4, wherein the inner side wall of the upper end of the lower tank body (3) is annularly provided with a seventh annular convex body (15), the seventh annular convex body (15) is positioned on the axial inner side of the third annular convex body (11), an annular groove IV (20) is formed between the seventh annular convex body (15) and the inner side wall of the lower tank body (3), an eighth annular convex body (16) is arranged on the inner end surface of the outer end of the connecting part (2a), and the eighth annular convex body (16) is embedded in the annular groove IV (20).

6. A membrane expansion tank according to claim 1, 2, 3 or 4, characterized in that the inner side wall of the lower tank body (3) is provided with a plurality of positioning notches (3a) therethrough, the outer side wall of the snap ring (8) is provided with a plurality of positioning protrusions (8a) matched with the positioning notches (3a), and the positioning protrusions (8a) are embedded in the corresponding positioning notches (3 a).

7. A membrane expansion tank according to claim 4, characterized in that both outer side walls of the annular convex body six (14) are conical surfaces one, both inner side walls of the annular groove two (18) are conical surfaces two, and the conical surfaces one abut against the corresponding conical surfaces two.

8. A membrane expansion tank according to claim 4 or 7, characterized in that said annular convex body six (14) and said annular concave groove two (18) are fixedly connected by spin-melt welding.

9. A membrane expansion tank according to claim 1 or 2 or 3 or 4, characterized in that said threaded joint (6) is of integral construction by injection moulding with said lower tank body (3).