Pressure early warning sealing cap for heat exchanger

Abstract

The utility model discloses a pressure early warning sealing cap for a heat exchanger, which belongs to the technical field of heat exchanger accessories, and is characterized by comprising a sealing cap main body, an air pressure display needle is arranged at the top in the sealing cap main body, and an elastic telescopic ring is sleeved at the bottom of the surface of the air pressure display needle. An elastic telescopic ring is arranged at the bottom of the sealing cap body, the edge of the elastic telescopic ring is embedded in the sealing cap body, a pressing ring is arranged at the bottom of the elastic telescopic ring, an annular sealing ring is arranged at the bottom of the pressing ring, and the bottom of the annular sealing ring makes contact with the end of the pipe joint. In the assembling process, redundant gas in multiple spaces where the air pressure display needle is installed in the sealing cap body can be automatically exhausted, the situation that normal work of the air pressure display needle is disturbed by pressure generated by the residual gas is avoided, and it is ensured that the air pressure display needle can accurately reflect the real pressure in the heat exchanger; the accuracy and reliability of pressure early warning are remarkably improved, and the equipment operation risk caused by misjudgment is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchanger accessories, and in particular to a pressure warning cap for heat exchangers. Background Technology

[0002] Pressure warning cap is an injection-molded part with internal threads, mainly used at pipe joints of components such as evaporators or condensers, and its main functions are sealing and pressure indication.

[0003] Existing pressure warning caps mostly use a structure that combines an elastic expansion ring with a pressure display needle. However, during the assembly process, the sealed space formed by the elastic expansion ring and the cap body is prone to residual gas. The internal pressure generated by these residual gases will interfere with the normal operation of the pressure display needle, causing it to fail to accurately reflect the true internal pressure of the heat exchanger and leading to misjudgment.

[0004] Furthermore, traditional pressure warning caps are often fixed to pipe fittings via threaded connections. However, this connection method has extremely stringent requirements for assembly torque: insufficient torque will cause the cap to loosen and the pipe fitting to fail, leading to media leakage; excessive torque may cause the seal to be excessively squeezed and deformed, and the threads to strip, which will also damage the sealing performance and even affect pressure transmission, causing the warning function to fail. In addition, the inconsistency in torque control during manual assembly further exacerbates the instability of product performance.

[0005] To address this, a pressure warning cap for heat exchangers is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a pressure warning cap for heat exchangers, which can solve the problem that in the existing pressure warning caps for heat exchangers, gas is easily left in the sealed space formed by the elastic expansion ring and the cap body during the assembly process. The internal pressure generated by these residual gases will interfere with the normal operation of the pressure display needle, causing it to fail to accurately reflect the real internal pressure of the heat exchanger and leading to misjudgment.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pressure warning cap for a heat exchanger, comprising a cap body, a pressure display needle disposed at the top inside the cap body, an elastic telescopic ring sleeved on the bottom surface of the pressure display needle, the edge of the elastic telescopic ring being embedded inside the cap body, a compression ring disposed at the bottom of the elastic telescopic ring, and an annular sealing ring disposed at the bottom of the compression ring, the bottom of the annular sealing ring contacting the end of the pipe joint, an exhaust assembly disposed at the top inside the cap body, and a connecting assembly disposed at the bottom of the cap body;

[0008] The exhaust assembly includes an exhaust channel, which is annularly formed at the top inside the cap body. The exhaust channel has two end plates inside, and a return spring and a sealing block are respectively arranged between the opposite sides of the two end plates. The side of the return spring near the end plate and the sealing block are respectively connected to both. The surface of the sealing block is in contact with the inner wall of the inner end plate.

[0009] Preferably, the connecting assembly includes a flexible connecting tube, the top of which is connected to the cap body, and the flexible connecting tube is sleeved on the surface of the pipe joint.

[0010] Preferably, two retaining rings are fitted onto the top and bottom of the surface of the flexible connecting tube, and the inner wall of each retaining ring is provided with a flexible pad, the flexible pad being in close contact with the side of the flexible connecting tube closest to it.

[0011] Preferably, a connecting bolt passes through the front and rear sides inside the two retaining rings, and the surface of the connecting bolt is fitted with an anti-loosening washer and threaded with a fastening nut, wherein the anti-loosening washer is in close contact with the side of the retaining ring closest to it.

[0012] Preferably, the top and bottom of the cap body are respectively provided with an upper cavity and a lower cavity, and the air pressure display needle and the pipe connector are respectively located inside the upper cavity and the lower cavity.

[0013] Preferably, the exhaust channel is connected to the side of the upper cavity, the inner wall of the exhaust channel is provided with a gas flow channel, and the gas flow channel is connected to the exhaust channel, and the interior of the end plate is hollow.

[0014] Preferably, the inner wall of the flexible connecting pipe is provided with two elastic pressure plates, and the inner wall of the elastic pressure plates is in close contact with the pipe joint, and the two elastic pressure plates are arranged symmetrically.

[0015] Preferably, two elastic pressure plates are arranged as a group, and several groups of elastic pressure plates are arranged and distributed at equal intervals inside the flexible connecting tube.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. By setting up an exhaust component, this application can automatically exhaust excess gas in multiple spaces where the pressure display needle is installed inside the cap body during the assembly process. This avoids the pressure generated by residual gas interfering with the normal operation of the pressure display needle, ensuring that the pressure display needle can accurately reflect the real pressure inside the heat exchanger. This significantly improves the accuracy and reliability of pressure warning and reduces the risk of equipment operation due to misjudgment.

[0018] 2. By setting up a connecting component, this application ensures a firm connection while reducing the dependence on precise assembly torque, avoiding sealing failure or thread damage caused by improper torque. This allows the connecting component to not only ensure a tight connection and good seal between the cap body and the pipe fitting, but also simplify the assembly process and improve assembly efficiency and product quality stability. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the pressure warning cap for the heat exchanger of this utility model;

[0020] Figure 2 This is a schematic diagram showing the connection between the cap body and the pipe connector of this utility model;

[0021] Figure 3 This is a schematic diagram showing the connection between the cap body and the exhaust assembly of this utility model;

[0022] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the connection assembly and pipe fitting of this utility model.

[0024] In the diagram, 1. Cap body; 2. Pressure indicator needle; 3. Elastic telescopic ring; 4. Compression ring; 5. Annular sealing ring; 6. Exhaust assembly; 61. Exhaust channel; 62. End plate; 63. Return spring; 64. Sealing block; 7. Connecting assembly; 71. Flexible connecting tube; 72. Snap ring; 73. Flexible pad; 74. Connecting bolt; 75. Anti-loosening washer; 76. Fastening nut; 8. Elastic pressure plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 The present invention provides the following technical solution:

[0027] A pressure warning cap for a heat exchanger includes a cap body 1, a pressure indicator needle 2 is provided at the top inside the cap body 1, an elastic expansion ring 3 is sleeved on the bottom surface of the pressure indicator needle 2, and the edge of the elastic expansion ring 3 is embedded inside the cap body 1, a compression ring 4 is provided at the bottom of the elastic expansion ring 3, and an annular sealing ring 5 is provided at the bottom of the compression ring 4. The bottom of the annular sealing ring 5 contacts the end of the pipe joint, an exhaust assembly 6 is provided at the top inside the cap body 1, and a connecting assembly 7 is provided at the bottom of the cap body 1.

[0028] The exhaust assembly 6 includes an exhaust channel 61, which is annularly formed at the top inside the cap body 1. The exhaust channel 61 has two end plates 62 inside. A return spring 63 and a blocking block 64 are respectively arranged between the opposite sides of the two end plates 62. The side of the return spring 63 close to the end plate 62 and the blocking block 64 is connected to both. The surface of the blocking block 64 is in contact with the inner wall of the inner end plate 62.

[0029] In this embodiment: When assembling the cap body 1 and the pressure indicator needle 2, there may be excess gas inside the cap body 1 through the exhaust assembly 6. This gas can enter the exhaust channel 61 as the pressure indicator needle 2 is installed, thereby pushing the sealing block 64 to compress the reset spring 63, thereby opening the exhaust channel 61 and allowing the gas to be discharged. After the assembly is completed, as the internal pressure of the heat exchanger changes, the pressure indicator needle 2 senses the pressure through the elastic expansion ring 3 and displays the corresponding status.

[0030] Specifically, such as Figure 5 As shown, the connecting component 7 includes a flexible connecting tube 71, the top of which is connected to the cap body 1, and the flexible connecting tube 71 is sleeved on the surface of the pipe joint.

[0031] Specifically, such as Figure 5 As shown, two retaining rings 72 are fitted onto the top and bottom of the surface of the flexible connecting tube 71, and the inner walls of the two retaining rings 72 are provided with flexible pads 73, with the side of the flexible pads 73 close to the flexible connecting tube 71 in close contact with it.

[0032] Specifically, such as Figure 5 As shown, a connecting bolt 74 passes through the front and rear sides inside the two retaining rings 72, and an anti-loosening washer 75 is sleeved on the surface of the connecting bolt 74 and a fastening nut 76 is threadedly connected thereto. The side of the anti-loosening washer 75 closest to the retaining ring 72 is in close contact with it.

[0033] In this embodiment: When installing the cap body 1 using the connecting component 7, the flexible connecting tube 71 is fitted onto the surface of the pipe joint. Utilizing the elasticity and flexibility of the flexible connecting tube 71, it fits tightly against the pipe joint, accommodating minor deviations during installation and displacement and deformation during subsequent operation. Then, the retaining ring 72 is fitted onto the top and bottom of the surface of the flexible connecting tube 71. The flexible pad 73 on the inner wall of the retaining ring 72 is in close contact with the flexible connecting tube 71. The connecting bolt 74 passes through the retaining ring 72 and the fastening nut 76 is tightened, so that the retaining ring 72 tightly clamps the flexible connecting tube 71, further fixing the connection between the flexible connecting tube 71 and the pipe joint. When tightening the connecting bolt 74, the anti-loosening washer 75 is pressed against the retaining ring 72. Utilizing the special structure of the anti-loosening washer 75 (such as serrations), the friction between it and the retaining ring 72 is increased, preventing the fastening nut 76 from loosening under vibration or external force. The design of the connecting component 7 reduces the dependence on precise assembly torque, avoiding sealing failure or thread damage caused by improper torque.

[0034] Specifically, such as Figure 2 As shown, the top and bottom of the cap body 1 are respectively provided with an upper cavity and a lower cavity, and the air pressure indicator needle 2 and the pipe connector are respectively located inside the upper cavity and the lower cavity.

[0035] Specifically, such as Figure 3 As shown, the exhaust channel 61 is connected to the side of the upper cavity, and the inner wall of the exhaust channel 61 is provided with a gas flow channel, which is connected to the exhaust channel 61. The end plate 62 is hollow inside.

[0036] In this embodiment: the structural design of the upper and lower cavities optimizes the internal space layout of the cap, which is conducive to the function of each component, improves the accuracy of pressure monitoring and the reliability of connection sealing; the connection design between the exhaust channel 61 and the upper cavity, as well as the structure of the gas flow channel and end plate 62, ensures the smoothness and automatic control of the exhaust process, effectively removes residual gas inside the cap, ensures that the indication of the pressure display needle 2 is not disturbed, and improves the accuracy of pressure warning.

[0037] Specifically, such as Figure 5 As shown, the inner wall of the flexible connecting pipe 71 is provided with two elastic pressure plates 8, and the inner wall of the elastic pressure plates 8 is in close contact with the pipe joint. The two elastic pressure plates 8 are arranged symmetrically.

[0038] Specifically, such as Figure 5 As shown, two elastic pressure plates 8 are arranged as a group, and several groups of elastic pressure plates 8 are arranged and distributed at equal intervals inside the flexible connecting tube 71.

[0039] In this embodiment: multiple sets of elastic pressure plates 8 are arranged to form multiple sealing defenses inside the flexible connecting pipe 71. During the installation process, each set of elastic pressure plates 8 fits tightly with the pipe joint and works together to ensure the sealing effect of the connection part in all aspects.

[0040] Working principle: When the sealing cap body 1 is in use, during the assembly of the sealing cap body 1 and the pressure display needle 2, excess gas in the upper cavity will enter the exhaust channel 61 along with the pressure display needle 2. The excess gas pushes the sealing block 64 to compress the reset spring 63, opening the exhaust channel 61 and allowing the gas to be discharged through the gas flow channel. After assembly, the reset spring 63 pushes the sealing block 64 to reset, resealing the exhaust channel 61 to ensure the sealing performance of subsequent pressure monitoring. Then, the flexible connecting tube 71 is fitted onto the pipe joint end of the heat exchanger, so that the pipe joint end contacts the annular sealing ring 5, and the flexible connecting tube 71... The top and bottom of the heat exchanger are fitted with retaining rings 72. The flexible pad 73 on the inner wall of the retaining ring 72 is in close contact with the flexible connecting tube 71. The retaining ring 72 is then tightened by connecting bolts 74 and fastening nuts 76, so that the retaining ring 72 clamps the flexible connecting tube 71, further fixing the connection. The serrated structure of the anti-loosening washer 75 generates friction with the retaining ring 72 when tightened, preventing the nut from loosening and reducing the dependence on precise assembly torque. When the internal pressure of the heat exchanger changes, the pressure is transmitted to the elastic expansion ring 3 through the clamping ring 4. The elastic expansion ring 3 deforms under the pressure, causing the pressure display needle 2 to move up and down, intuitively displaying the pressure status.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure warning closure cap for a heat exchanger, comprising a closure cap body (1), characterized in that: The top of the cap body (1) is provided with a gas pressure display needle (2), the bottom of the surface of the gas pressure display needle (2) is sleeved with an elastic expansion ring (3), the edge of the elastic expansion ring (3) is embedded in the inside of the cap body (1), the bottom of the elastic expansion ring (3) is provided with a compression ring (4), the bottom of the compression ring (4) is provided with an annular sealing ring (5), the bottom of the annular sealing ring (5) is in contact with the end of the pipe joint, the top of the inside of the cap body (1) is provided with an exhaust assembly (6), the bottom of the cap body (1) is provided with a connecting assembly (7). The exhaust assembly (6) comprises an exhaust channel (61), the exhaust channel (61) is annularly arranged in the top of the inside of the cap body (1), the inside of the exhaust channel (61) is provided with two end plates (62), the opposite sides of the two end plates (62) are respectively provided with a reset spring (63) and a blocking block (64), the side of the reset spring (63) close to the end plate (62) and the blocking block (64) is connected with the two, the surface of the blocking block (64) is in contact with the inner wall of the end plate (62).

2. A pressure warning cap for a heat exchanger according to claim 1, characterized in that: The connecting assembly (7) comprises a flexible connecting pipe (71), the top of the flexible connecting pipe (71) is connected with the cap body (1), and the surface of the flexible connecting pipe (71) is sleeved on the surface of the pipe joint.

3. A pressure warning cap for a heat exchanger according to claim 2, wherein: The top and bottom of the surface of the flexible connecting pipe (71) are sleeved with two clamping rings (72), and the inner walls of the two clamping rings (72) are provided with flexible pads (73), and the side of the flexible pad (73) close to the flexible connecting pipe (71) is in close contact with it.

4. A pressure warning cap for a heat exchanger according to claim 3, wherein: The front side and the rear side of the inside of the two clamping rings (72) are penetrated by a connecting bolt (74), the surface of the connecting bolt (74) is sleeved with an anti-loose pad (75) and a fastening nut (76) is screwed, and the side of the anti-loose pad (75) close to the clamping ring (72) is in close contact with it.

5. A pressure warning cap for a heat exchanger according to claim 1, wherein: The top and bottom of the inside of the cap body (1) are respectively provided with an upper cavity and a lower cavity, and the gas pressure display needle (2) and the pipe joint are respectively arranged in the inside of the upper cavity and the lower cavity.

6. A pressure warning closure cap for a heat exchanger as defined in claim 5, wherein: The side of the exhaust channel (61) close to the upper cavity is communicated with the upper cavity, the inner wall of the exhaust channel (61) is provided with a gas flow channel, and the gas flow channel is communicated with the exhaust channel (61), and the inside of the end plate (62) is hollow.

7. A pressure warning cap for a heat exchanger according to claim 2, wherein: The inner wall of the flexible connecting pipe (71) is provided with two elastic pressing pieces (8), and the inner wall of the elastic pressing piece (8) is in close contact with the pipe joint, and the two elastic pressing pieces (8) are symmetrically arranged.

8. A pressure warning cap for a heat exchanger according to claim 7, characterized in that: The two elastic pressing pieces (8) are arranged in a group, and the elastic pressing pieces (8) are arranged in a plurality of groups and are equally distributed in the inside of the flexible connecting pipe (71). The two elastic pressing pieces (8) are arranged in a group, and the elastic pressing pieces (8) are arranged in a plurality of groups and are equally distributed in the inside of the flexible connecting pipe (71).

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