PVDF (Polyvinylidene Fluoride) pipe with built-in phase change heat storage structure

Abstract

The utility model relates to the technical field of PVDF (Polyvinylidene Fluoride) pipes, and discloses a PVDF pipe with a built-in phase change heat storage structure, which solves the problem that the existing PVDF pipe is larger in thermal expansion coefficient and can cause larger size change, and comprises a PVDF pipe body, an inner pipe is arranged in the PVDF pipe body, a fixing mechanism is arranged between the inner pipe and the PVDF pipe body, and the PVDF pipe body is provided with a phase change heat storage structure. The outer wall of the inner pipe is evenly and fixedly connected with a plurality of annular reinforcing ribs, the outer wall of each annular reinforcing rib is tightly attached to the inner wall of the PVDF pipe body, a closed annular cavity is formed between every two adjacent annular reinforcing ribs and the PVDF pipe body and between every two adjacent annular reinforcing ribs and the inner pipe, and the annular cavities are filled with phase change materials. According to the utility model, the inner pipe can be fixed in the PVDF pipe body, and the phase change material is filled in the closed annular cavity formed among the two adjacent annular reinforcing ribs, the PVDF pipe body and the inner pipe, so that the PVDF pipe body can be endowed with higher temperature adaptability by fully utilizing the heat absorption and heat release characteristics of the phase change material, and the influence of thermal expansion coefficient can be conveniently reduced.

Description

Technical Field

[0001] This utility model belongs to the field of PVDF pipe technology, specifically a PVDF pipe with a built-in phase change heat storage structure. Background Technology

[0002] PVDF pipes have tightly packed molecular chains with strong hydrogen bonds, making them inherently flame-retardant. Their outstanding features include high mechanical strength, good radiation resistance, and long-term outdoor use without maintenance. They also have good chemical stability and are not corroded by acids, alkalis, strong oxidants, or halogens at room temperature. They are widely used in petrochemical, electronics, steel plant pickling, and the transportation of acid and alkali solutions.

[0003] Currently, PVDF pipes have a large coefficient of thermal expansion in high-temperature environments, which may lead to significant dimensional changes, thereby affecting the stability and sealing of the system. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a PVDF pipe with a built-in phase change heat storage structure, which effectively solves the problem that the large thermal expansion coefficient of the current PVDF pipe may lead to large dimensional changes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a PVDF pipe with a built-in phase change heat storage structure, comprising a PVDF pipe body, an inner tube inside the PVDF pipe body, a fixing mechanism between the inner tube and the PVDF pipe body, and multiple annular reinforcing ribs uniformly fixedly connected to the outer wall of the inner tube, the outer wall of each annular reinforcing rib being tightly fitted to the inner wall of the PVDF pipe body, and a closed annular cavity being formed between two adjacent annular reinforcing ribs, the PVDF pipe body, and the inner tube, the annular cavity being filled with phase change material.

[0006] Preferably, an abutment ring is fixedly installed inside the PVDF pipe body, the abutment ring is provided with an annular limiting groove, an abutment sealing ring is fixedly connected inside the annular limiting groove, and one end of the inner tube is inserted into the annular limiting groove and tightly fits with the abutment sealing ring.

[0007] Preferably, the fixing mechanism includes a pressure ring located at the end of the inner tube away from the sealing ring, an annular receiving groove is provided at one end of the PVDF tube body, a fixed sealing ring is fixedly connected inside the annular receiving groove, an end sealing ring is fixedly connected at the end of the inner tube away from the sealing ring, the pressure ring is inserted into the annular receiving groove, and both the fixed sealing ring and the end sealing ring are tightly fitted with the pressure ring.

[0008] Preferably, two sliders are symmetrically fixedly connected to the outer side of the pressure ring, and two sliding grooves are symmetrically provided at one end of the PVDF tube. The two sliders are slidably connected to the two sliding grooves respectively, and a positioning block is fixedly connected in each of the two sliding grooves. The two sliders are movably sleeved on the outer side of the two positioning blocks respectively.

[0009] Preferably, two side blocks are symmetrically fixedly connected to the side of the pressure ring away from the inner tube. An L-shaped round rod is fixedly connected between the side of the two side blocks that are far apart from each other and the pressure ring. A screw sleeve is movably sleeved on the outer side of each of the two L-shaped round rods. An insert plate is fixedly connected to the outer side of each of the two screw sleeves. A slot is provided on the side of the two positioning blocks that are close to each other. The two insert plates are respectively inserted into the two slots.

[0010] Preferably, a sleeve block is fixedly sleeved on the outer side of the L-shaped round rod, a screw is rotatably connected to the side of the sleeve block near the side block, a turntable is fixedly connected to the end of the screw away from the sleeve block, the screw passes through the side block and is rotatably connected to the side block, and a threaded sleeve is threaded onto the outer side of the screw.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model, through the cooperation between the annular limiting groove and the inner tube, as well as the slider and the positioning block, facilitates the contact between the pressure ring and the end of the inner tube away from the abutment ring. Through the cooperation between the turntable and the screw, as well as the screw sleeve and the L-shaped round rod, it is easy for the two insert plates to be inserted into the two slots respectively, which can fix the position of the pressure ring, thereby fixing the inner tube in the PVDF tube body. At the same time, the closed annular cavity formed between the two adjacent annular reinforcing ribs, the PVDF tube body and the inner tube is filled with phase change material, which can make full use of the heat absorption and heat release characteristics of the phase change material, giving the PVDF tube body a greater temperature adaptability, thereby facilitating the reduction of the influence of the coefficient of thermal expansion.

[0013] 2. This new type of pipe facilitates the sealing between the inner pipe and the PVDF pipe body by cooperating with the inner pipe and the contact sealing ring, as well as the fixing sealing ring and the end sealing ring. Attached Figure Description

[0014] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the PVDF pipe structure with built-in phase change heat storage structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the PVDF pipe body of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the PVDF pipe body of this utility model;

[0019] Figure 4 This utility model Figure 3Enlarged structural diagram at point A in the middle;

[0020] Figure 5 This is a schematic diagram of the inner tube structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the fixing mechanism of this utility model;

[0022] Figure 7 This is a schematic diagram of the L-shaped round rod structure of this utility model.

[0023] In the diagram: 1. PVDF pipe body; 2. Fixing mechanism; 201. Pressure ring; 202. Slider; 203. L-shaped round rod; 204. Turntable; 205. Side block; 206. Screw; 207. Screw sleeve; 208. Sleeve block; 209. Insert plate; 3. Inner tube; 4. Annular receiving groove; 5. Fixing sealing ring; 6. Annular limiting groove; 7. Abutment sealing ring; 8. Abutment ring; 9. Positioning block; 10. Slot; 11. Slide groove; 12. End sealing ring; 13. Annular reinforcing rib. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Example 1, by Figure 1-2 The present invention relates to a PVDF pipe with a built-in phase change heat storage structure, comprising a PVDF pipe body 1, an inner tube 3 inside the PVDF pipe body 1, a fixing mechanism 2 between the inner tube 3 and the PVDF pipe body 1, and multiple annular reinforcing ribs 13 uniformly fixedly connected to the outer wall of the inner tube 3. The outer wall of each annular reinforcing rib 13 is tightly fitted to the inner wall of the PVDF pipe body 1. Two adjacent annular reinforcing ribs 13 form a closed annular cavity with the PVDF pipe body 1 and the inner tube 3. The annular cavity is filled with phase change material. The inner tube 3 is made of a high-density material, which can effectively conduct internal heat to the annular cavity, thereby facilitating the absorption of heat by the phase change material.

[0026] The phase change material is a eutectic salt of calcium chloride hexahydrate and magnesium chloride hexahydrate, and is prepared into granular objects by molding. The granular phase change material is filled into a closed annular cavity between two adjacent annular reinforcing ribs 13 and the PVDF tube body 1 and inner tube 3. The phase change heat storage material absorbs or releases heat, slows down the temperature change inside the PVDF tube body 1, and thus reduces the influence of the coefficient of thermal expansion.

[0027] Specifically, by Figure 3-7 The PVDF tube body 1 has an abutment ring 8 fixedly installed inside, and an annular limiting groove 6 is provided on the abutment ring 8. An abutment sealing ring 7 is fixedly connected inside the annular limiting groove 6. One end of the inner tube 3 is inserted into the annular limiting groove 6 and is tightly fitted with the abutment sealing ring 7. The fixing mechanism 2 includes a pressure ring 201 located at the end of the inner tube 3 away from the abutment sealing ring 7. One end of the PVDF tube body 1 has an annular receiving groove 4, and a fixing sealing ring 5 is fixedly connected inside the annular receiving groove 4. An end sealing ring 12 is fixedly connected at the end of the inner tube 3 away from the abutment sealing ring 7. The pressure ring 201 is inserted into the annular receiving groove 4, and both the fixing sealing ring 5 and the end sealing ring 12 are tightly fitted with the pressure ring 201. Two sliders 202 are symmetrically fixedly connected to the outside of the pressure ring 201. One end of the PVDF tube body 1 has two symmetrically provided sliding grooves 11. The two sliders 202 are slidably connected to the two sliding grooves 11 respectively. A positioning block 9 is fixedly connected in each of the two sliding grooves 11. The two sliders 202 are movably sleeved on the two positioning blocks 9 respectively. On the outer side of block 9, two side blocks 205 are symmetrically fixedly connected to the side of the pressure ring 201 away from the inner tube 3. L-shaped round rods 203 are fixedly connected between the two side blocks 205 and the pressure ring 201 on the side away from each other. Screw sleeves 207 are movably sleeved on the outer side of each of the two L-shaped round rods 203. Insert plates 209 are fixedly connected to the outer side of each of the two screw sleeves 207. Slots 10 are provided on the side of the two positioning blocks 9 that are close to each other. The two insert plates 209 are respectively inserted into the two slots 10. The L-shaped round rods 20... A sleeve block 208 is fixedly sleeved on the outside of the 3. A screw 206 is rotatably connected to the side of the sleeve block 208 near the side block 205. A turntable 204 is fixedly connected to the end of the screw 206 away from the sleeve block 208. The screw 206 passes through the side block 205 and is rotatably connected to the side block 205. A screw sleeve 207 is threaded onto the outside of the screw 206. By setting the cooperation between the abutment sealing ring 7, the fixed sealing ring 5 and the end sealing ring 12, the sealing between the PVDF pipe body 1 and the inner pipe 3 is guaranteed.

[0028] In use, first insert one end of the inner tube 3 into the annular limiting groove 6 and abut against the sealing ring 7. Then place the pressure ring 201 into the annular receiving groove 4, so that the two sliders 202 are respectively fitted onto the outside of the two positioning blocks 9 until the end sealing ring 12 and the fixed sealing ring 5 abut against the pressure ring 201. Then rotate the two turntables 204 to drive the two screws 206 to rotate and drive the two screw sleeves 207 to slide along the two L-shaped round rods 203 respectively. At the same time, the two insert plates 209 move away from each other until they are respectively inserted into the two slots 10 to fix the pressure ring 201 to the two positioning blocks 9. Finally, the installation and fixation of the inner tube 3 is completed.

Claims

1. A PVDF pipe with a built-in phase change thermal storage structure, comprising a PVDF pipe body (1), characterized in that: The PVDF tube body (1) is provided with an inner tube (3) inside. A fixing mechanism (2) is provided between the inner tube (3) and the PVDF tube body (1). Multiple annular reinforcing ribs (13) are uniformly fixedly connected to the outer wall of the inner tube (3). The outer wall of each annular reinforcing rib (13) is tightly fitted to the inner wall of the PVDF tube body (1). Two adjacent annular reinforcing ribs (13) form a closed annular cavity between the PVDF tube body (1) and the inner tube (3). The annular cavity is filled with phase change material.

2. The PVDF pipe with an integrated phase change thermal storage structure according to claim 1, characterized in that: An abutment ring (8) is fixedly installed inside the PVDF pipe body (1). An annular limiting groove (6) is provided on the abutment ring (8). An abutment sealing ring (7) is fixedly connected inside the annular limiting groove (6). One end of the inner tube (3) is inserted into the annular limiting groove (6) and is tightly fitted with the abutment sealing ring (7).

3. The PVDF pipe with an integrated phase change thermal storage structure according to claim 1, characterized in that: The fixing mechanism (2) includes a pressure ring (201) located at the end of the inner tube (3) away from the sealing ring (7). One end of the PVDF tube body (1) is provided with an annular receiving groove (4). A fixing sealing ring (5) is fixedly connected inside the annular receiving groove (4). An end sealing ring (12) is fixedly connected at the end of the inner tube (3) away from the sealing ring (7). The pressure ring (201) is inserted into the annular receiving groove (4), and both the fixing sealing ring (5) and the end sealing ring (12) are tightly fitted with the pressure ring (201).

4. The PVDF pipe with a built-in phase change thermal storage structure according to claim 3, characterized in that: Two sliders (202) are symmetrically fixedly connected to the outer side of the pressure ring (201). Two sliding grooves (11) are symmetrically provided at one end of the PVDF tube body (1). The two sliders (202) are slidably connected to the two sliding grooves (11) respectively. Positioning blocks (9) are fixedly connected in both sliding grooves (11). The two sliders (202) are movably sleeved on the outer side of the two positioning blocks (9) respectively.

5. The PVDF pipe with an integrated phase change thermal storage structure according to claim 3, characterized in that: Two side blocks (205) are symmetrically fixedly connected to the side of the pressure ring (201) away from the inner tube (3). An L-shaped round rod (203) is fixedly connected between the side of the two side blocks (205) away from each other and the pressure ring (201). A screw sleeve (207) is movably sleeved on the outer side of the two L-shaped round rods (203). An insert plate (209) is fixedly connected on the outer side of the two screw sleeves (207). A slot (10) is provided on the side of the two positioning blocks (9) close to each other. The two insert plates (209) are respectively inserted into the two slots (10).

6. The PVDF pipe with a built-in phase change thermal storage structure according to claim 5, characterized in that: A sleeve block (208) is fixedly sleeved on the outer side of the L-shaped round rod (203). A screw rod (206) is rotatably connected to the side of the sleeve block (208) near the side block (205). A turntable (204) is fixedly connected to the end of the screw rod (206) away from the sleeve block (208). The screw rod (206) passes through the side block (205) and is rotatably connected to the side block (205). A threaded sleeve (207) is threaded onto the outer side of the screw rod (206).

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