Anti-freezing safety valve and heat exchanger assembly

Abstract

The utility model belongs to the technical field of safety valves, and particularly relates to an anti-freezing safety valve and a heat exchanger assembly comprising the anti-freezing safety valve. The anti-freezing safety valve comprises a shell and a sealing piston arranged in the shell, one end of the sealing piston and the inner wall of the shell surround to form a volume-variable liquid containing cavity communicated with the water pipe, and the end, away from the liquid containing cavity, of the sealing piston abuts against an elastic telescopic mechanism. The end, not abutting against the sealing piston, of the elastic telescopic mechanism abuts against the shell. The heat exchanger assembly comprises a heat exchanger, a water pipe communicated with the heat exchanger and the anti-freezing safety valve, and the water pipe is communicated with the liquid containing cavity of the anti-freezing safety valve. The anti-freezing safety valve provided by the utility model has a pressure relief function, can automatically recover normal operation, can be repeatedly used without resetting, and is particularly suitable for the condition that freezing and unfreezing possibly occur frequently.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety valves, in particular to an antifreeze safety valve and also to a heat exchanger component with the antifreeze safety valve. Background Art

[0002] In a refrigeration system that uses water as a heat exchange medium, the water in the refrigeration system channel may freeze due to the influence of ambient temperature and equipment operating status. The pipeline and heat exchanger together form a sealed loop, and the volume of water expands when it freezes. If the pressure generated by the expansion of water when it freezes cannot be released, the pipeline or heat exchanger may be broken, causing damage to the heat exchange system. In the prior art, there is a technical solution of connecting an antifreeze safety valve to the pipeline for pressure relief, but the existing antifreeze safety valve has the problem of needing to be manually reset, and cannot automatically resume normal operation after the freezing is lifted. Utility Model Content

[0003] In order to solve the above technical problems, it is necessary to provide an antifreeze safety valve which can automatically resume normal operation after the freezing is released.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] An antifreeze safety valve comprises a shell and a sealing piston arranged in the shell, one end of the sealing piston and the inner wall of the shell are surrounded to form a variable-volume liquid-containing chamber connected to the water pipe, one end of the sealing piston facing away from the liquid-containing chamber is abutted with an elastic telescopic mechanism, and the end of the elastic telescopic mechanism not abutting against the sealing piston is abutted against the shell.

[0006] In the antifreeze safety valve provided by the utility model, when water expands due to freezing, the sealing piston is pushed in the direction of expanding the solution cavity, accommodating the water squeezed out of the water pipe, thus playing a role of pressure relief; when the ice in the water pipe melts and shrinks, the sealing piston is pushed back to its original position by the elastic telescopic mechanism. Since the liquid-containing cavity formed by the sealing piston and the inner wall of the shell remains sealed and has a variable volume, the antifreeze safety valve has a pressure relief effect and can automatically resume normal operation, and can be reused without manual resetting, and is particularly suitable for situations where freezing and thawing may occur frequently.

[0007] Preferably, the elastic telescopic mechanism comprises a compression spring.

[0008] Preferably, the sealing piston comprises a positioning column for the compression spring to be sleeved, the elastic telescopic mechanism comprises a spring limiting plate abutting against the compression spring, and the spring limiting plate is provided with a limiting groove cooperating with the elastic telescopic mechanism.

[0009] Preferably, a screw hole is provided on the housing, and the elastic telescopic mechanism further comprises an adjusting bolt passing through the screw hole and connected to the spring limit plate, the adjusting bolt being connected to the end of the spring limit plate away from the limit groove, the head of the adjusting bolt being located outside the housing, and the thread matching the screw hole on the housing. By twisting the head of the adjusting bolt, the adjusting bolt can be screwed in or out relative to the housing, driving the spring limit plate to reciprocate relative to the sealing piston, thereby adjusting the preload force of the compression spring.

[0010] Preferably, the spring limit plate is provided with a screw hole that cooperates with the adjusting bolt, the adjusting bolt is bolted to the spring limit plate, and the end of the adjusting bolt passes through the spring limit plate and extends into the inner hole of the compression spring. In this structure, the adjusting bolt cooperates with the spring limit plate to fix the compression spring, and the two ends of the compression spring are sleeved on the protruding structure for easy installation and positioning.

[0011] Preferably, a heating wire is wound around the shell, and the heating wire is connected to an external power source. The water in the antifreeze safety valve may also freeze and become ineffective when completely frozen. If necessary, the antifreeze safety valve can be heated to ensure that it can work normally. Since the diameter of the antifreeze safety valve is larger than the diameter of the water pipe, the thawing speed of the antifreeze safety valve may also be slower than the thawing speed of the water pipe when the temperature rises. During thawing, the antifreeze safety valve can also be heated to enable the heat exchanger assembly to resume normal operation as soon as possible.

[0012] Preferably, the cross section of the sealing piston is circular. Since a spring is used as the elastic member, and the spring has a spiral rotation direction, the piston may be driven to rotate during the elastic expansion and contraction process of the elastic expansion and contraction mechanism. When a circular sealing piston is used, that is, when the cross section of the liquid-containing cavity is circular, even if the sealing piston rotates, it has no effect on the sealing performance, and the sealing piston always remains sealed.

[0013] A heat exchanger assembly comprises a heat exchanger, a water pipe connected to the heat exchanger, and the antifreeze safety valve as described above, wherein the water pipe is connected to a liquid containing cavity of the antifreeze safety valve.

[0014] Since it includes the antifreeze safety valve as described above, the heat exchanger assembly has all the beneficial technical effects brought by the antifreeze safety valve, which will not be described one by one here.

[0015] Preferably, it also includes two one-way valves arranged on the water pipe to limit the one-way passage of water flow, the two one-way valves are respectively a first one-way valve arranged before the water pipe enters the heat exchanger and a second one-way valve arranged after the water pipe passes through the heat exchanger, the antifreeze safety valve as described above is connected between the first one-way valve and the heat exchanger, and the antifreeze safety valve as described above is also connected between the heat exchanger and the second one-way valve. Since it is impossible to confirm the position where the freezing first begins, setting one-way valves in both the water inlet and water outlet directions of the heat exchanger can ensure that the heat exchanger located between the two one-way valves will not be squeezed from both ends of the pipeline at the same time, and the water located inside the heat exchanger can flow out from at least one end, thereby ensuring the safety of the heat exchanger and not affecting the operation of the heat exchanger in a normal state; the first antifreeze safety valve and the second antifreeze safety valve are arranged to release the pressure caused by the freezing and expansion of water in the heat exchanger assembly. Through the cooperation of the two one-way valves and the two antifreeze safety valves, the purpose of preventing the heat exchanger from being cracked by the water that expands in volume after freezing at low temperatures is achieved, and the operation of the heat exchanger in a normal state is not affected.

[0016] Preferably, the sum of the volume of the heat exchanger plus the volume of the pipeline between the two one-way valves is V1, and the sum of the rated effective volumes of the two antifreeze safety valves is V2, satisfying V2 ≥ V1 * 20%. Since the volume of water increases by about 10% when it freezes, when this condition is met, the antifreeze safety valve can completely absorb the pressure released by the expansion of water freezing in the heat exchanger, and the volume is moderate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0018] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment;

[0019] Figure 2 It is a schematic structural diagram of the first antifreeze safety valve in a preferred embodiment.

[0020] In the figure: heat exchanger 1, water pipe 2, first one-way valve 3, second one-way valve 4, antifreeze safety valve 5, shell 51, sealing piston 52, positioning column 521, elastic telescopic mechanism 53, compression spring 531, spring limit plate 532, adjusting bolt 533, heating wire 54, refrigerant pipe 6. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0022] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and combined with it as a whole, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this article are only for the purpose of illustrating the present utility model.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] refer to Figure 1 In a preferred embodiment, the antifreeze safety valve of the utility model comprises a housing 51, a sealing piston 52 disposed in the housing 51, one end of the sealing piston 52 and the inner wall of the housing 51 surround a variable volume liquid chamber connected to the water pipe 2, one end of the sealing piston 52 away from the liquid chamber abuts against an elastic telescopic mechanism 53, and the end of the elastic telescopic mechanism 53 not abutting against the sealing piston 52 abuts against the housing 51. In a preferred embodiment, a compression spring 531 is used as the elastic member, and in other embodiments, a spring sheet, an air spring, etc. can also be used as the elastic member.

[0025] refer to Figure 1 In a preferred embodiment, the elastic telescopic mechanism 53 includes a compression spring 531. One end of the compression spring 531 in the preferred embodiment directly abuts against the sealing piston 52, and the other end abuts against the spring stop plate 532. In other embodiments, the compression spring 531 may be connected to an intermediate connecting member or fixedly connected to the sealing piston 52. The compression spring 531 is located between the sealing piston 52 and the housing 51 so as to produce a telescopic effect.

[0026] refer to Figure 1 In a preferred embodiment, the sealing piston 52 includes a positioning column 521 for the compression spring 531 to be sleeved, and the elastic telescopic mechanism 53 includes a spring limiting plate 532 abutting against the compression spring 531, and the spring limiting plate 532 is provided with a limiting groove that cooperates with the elastic telescopic mechanism 53.

[0027] refer to Figure 1In a preferred embodiment, a screw hole is provided on the housing 51, and the elastic expansion mechanism 53 further includes an adjusting bolt 533 passing through the screw hole and connected to the spring limiting plate 532. The adjusting bolt 533 is connected to the end of the spring limiting plate 532 away from the limiting groove, and the head is located outside the housing 51, and the thread is matched with the screw hole on the housing 51. The adjusting bolt 533 can be screwed in or out relative to the housing 51 by twisting the head of the adjusting bolt 533, so as to drive the spring limiting plate 532 to reciprocate relative to the sealing piston 52, thereby adjusting the preload force of the compression spring 531. The adjusting bolt 533 in the preferred embodiment is bolted to the spring limiting plate 532, and in other embodiments, it can also be fixedly connected.

[0028] In a preferred embodiment, the spring stop plate 532 is provided with a screw hole that cooperates with the adjusting bolt 533, the adjusting bolt 533 is bolted to the spring stop plate 532, and the end of the adjusting bolt 533 passes through the spring stop plate 532 and extends into the inner hole of the compression spring 531. In this structure, the adjusting bolt 533 cooperates with the spring stop plate 532 to fix the compression spring 531, and the two ends of the compression spring 531 are sleeved on the protruding structure for easy installation and positioning.

[0029] In a preferred embodiment, a heating wire 54 is wound around the housing 51, and the heating wire 54 is connected to an external power source. The water in the antifreeze safety valve 5 may also freeze and become ineffective when completely frozen. If necessary, the antifreeze safety valve 5 may be heated to ensure that it can work normally. Since the diameter of the antifreeze safety valve 5 is larger than the diameter of the water pipe 2, the thawing speed of the antifreeze safety valve 5 may also be slower than the thawing speed of the water pipe 2 when the temperature rises. During thawing, the antifreeze safety valve 5 may also be heated to enable the heat exchanger assembly to resume normal operation as soon as possible.

[0030] In a preferred embodiment, the cross section of the sealing piston 52 is circular. Since a compression spring 531 is used as the elastic member, and the compression spring 531 has a spiral rotation direction, the piston may be driven to rotate during the elastic expansion and contraction process of the elastic expansion and contraction mechanism 53. When a circular sealing piston 52 is used, that is, when the cross section of the liquid chamber is circular, even if the sealing piston 52 rotates, it has no effect on the sealing performance, and the sealing piston 52 always remains sealed. In other embodiments, a structure in which the housing 51 abuts against the sealing piston 52 to prevent it from rotating may also be adopted. For example, the cross section of the sealing piston 52 is a regular hexagonal cross section. Since the two ends of the compression spring 531 are abutted instead of fixedly connected, the spring rotation direction has almost no effect on the sealing performance of the sealing piston 52.

[0031] The utility model also provides a heat exchanger assembly, including a heat exchanger 1, a water pipe 2 connected to the heat exchanger 1, and an antifreeze safety valve 5 as described above, wherein the water pipe 2 is connected to a liquid containing cavity of the antifreeze safety valve 5. In a preferred embodiment, a refrigerant pipe 6 passes through the heat exchanger 1 and completes heat transfer with water in the water pipe 2 in the heat exchanger 1.

[0032] In a preferred embodiment, the heat exchanger assembly further comprises two one-way valves arranged on the water pipe 2 to limit the one-way passage of water flow, the two one-way valves being respectively a first one-way valve 3 arranged before the water pipe 2 enters the heat exchanger 1 and a second one-way valve 4 arranged after the water pipe 2 passes through the heat exchanger 1, the antifreeze safety valve 5 as described above is connected between the first one-way valve 3 and the heat exchanger 1, and the antifreeze safety valve 5 as described above is also connected between the heat exchanger 1 and the second one-way valve 4. Since it is impossible to confirm the position where the ice first starts to form, one-way valves are arranged in both the water inlet and outlet directions of the heat exchanger 1 to ensure that the heat exchanger 1 located between the two one-way valves will not be squeezed from both ends of the pipeline at the same time, and the water located inside the heat exchanger 1 can flow out from at least one end, thereby ensuring the safety of the heat exchanger 1 and not affecting the operation of the heat exchanger 1 under normal conditions; the first antifreeze safety valve 5 and the second antifreeze safety valve 5 are arranged to release the pressure caused by the expansion of water freezing in the heat exchanger assembly. The cooperation of the two one-way valves and the two antifreeze safety valves 5 can achieve the purpose of preventing the heat exchanger 1 from being cracked by water that expands after freezing at low temperatures, without affecting the normal operation of the heat exchanger 1.

[0033] In a preferred embodiment, the sum of the volume of the heat exchanger 1 plus the volume of the pipeline between the two one-way valves is V1, and the sum of the rated effective volumes of the two antifreeze safety valves 5 is V2, satisfying V2≥V1*20%. Since the volume of water increases by about 10% when it freezes, when this condition is met, the antifreeze safety valve 5 can completely absorb the pressure released by the expansion of water in the heat exchanger 1 when it freezes, and the volume is moderate.

[0034] In a preferred embodiment, the thrust applied by the elastic telescopic mechanism to the sealing piston is P f , the water flow pressure in the refrigeration system pipeline under normal working conditions is P w The elastic force adjustable parameter of the elastic telescopic mechanism is N, satisfying P f ≥P w *N, where 1≤N≤10.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0037] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An antifreeze safety valve, characterized in that: The invention comprises a shell (51) and a sealing piston (52) arranged in the shell (51); one end of the sealing piston (52) surrounds the inner wall of the shell (51) to form a liquid-containing chamber with a variable volume connected to a water pipe (2); one end of the sealing piston (52) facing away from the liquid-containing chamber is in contact with an elastic telescopic mechanism (53); and the end of the elastic telescopic mechanism (53) not in contact with the sealing piston (52) is in contact with the shell (51).

2. The antifreeze safety valve according to claim 1, characterized in that: The elastic telescopic mechanism (53) comprises a compression spring (531).

3. The antifreeze safety valve according to claim 2, characterized in that: The sealing piston (52) comprises a positioning column (521) for the compression spring (531) to be sleeved, and the elastic telescopic mechanism (53) comprises a spring limiting plate (532) abutting against the compression spring (531), and the spring limiting plate (532) is provided with a limiting groove matching the elastic telescopic mechanism (53).

4. The antifreeze safety valve according to claim 3, characterized in that: The shell (51) is provided with a screw hole, and the elastic telescopic mechanism (53) further comprises an adjusting bolt (533) passing through the screw hole and connected to the spring limiting plate (532), the adjusting bolt (533) being connected to an end of the spring limiting plate (532) away from the limiting groove, the head of the adjusting bolt (533) being located outside the shell (51), and the thread thereof being matched with the screw hole on the shell (51).

5. The antifreeze safety valve according to claim 4, characterized in that: The spring limiting plate (532) is provided with a screw hole that cooperates with the adjusting bolt (533); the adjusting bolt (533) is bolted to the spring limiting plate (532) and the end of the adjusting bolt (533) passes through the spring limiting plate (532) and extends into the inner hole of the compression spring (531).

6. An antifreeze safety valve according to any one of claims 1 to 4, characterized in that: A heating wire (54) is wound around the housing (51), and the heating wire (54) is connected to an external power source.

7. An antifreeze safety valve according to any one of claims 1 to 4, characterized in that: The sealing piston (52) has a circular cross section.

8. A heat exchanger assembly, comprising a heat exchanger (1), a water pipe (2) connected to the heat exchanger (1), characterized in that: It also comprises an antifreeze safety valve (5) as claimed in any one of claims 1 to 7, and the water pipe (2) is connected to the liquid containing cavity of the antifreeze safety valve (5).

9. A heat exchanger assembly according to claim 8, characterized in that: It also includes two one-way valves arranged on the water pipe (2) to limit the one-way passage of water, the two one-way valves being respectively a first one-way valve (3) arranged before the water pipe (2) enters the heat exchanger (1) and a second one-way valve (4) arranged after the water pipe (2) passes through the heat exchanger (1), an antifreeze safety valve (5) as described above being connected between the first one-way valve (3) and the heat exchanger (1), and an antifreeze safety valve (5) as described above being also connected between the heat exchanger (1) and the second one-way valve (4).

10. A heat exchanger assembly according to claim 9, characterized in that: The sum of the volume of the heat exchanger (1) and the volume of the pipeline between the two one-way valves is set to V1, and the sum of the rated effective volumes of the two antifreeze safety valves (5) is set to V2, satisfying V2≥V1*20%.

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