Pressure difference switch and chiller with multi-speed adjustment function

Abstract

The present invention discloses a pressure differential switch and a chiller with a multi-speed regulating function, wherein the pressure differential switch comprises: a housing, wherein the housing has a receiving chamber; a valve core, wherein the valve core is movably arranged in the receiving chamber, and wherein the valve core divides the receiving chamber into a first pressure chamber and a second pressure chamber; an elastic member, wherein the elastic member is arranged in the first pressure chamber, wherein the first end of the elastic member is arranged on the valve core, and the second end of the elastic member is arranged on the inner wall of the first pressure chamber; wherein the valve core is displaced under the action of the pressure differential and triggers the pressure differential switch to open or close; and an adjusting device, wherein the adjusting device is connected to the valve core, and wherein the adjusting device is used to adjust the initial position of the valve core. The pressure differential switch of the present invention can change the pressure differential value required to trigger the opening of the differential pressure switch according to actual needs by arranging the adjusting device and arranging the elastic member in the first pressure chamber, thereby improving the versatility of the pressure differential switch.

Description

Technical Field

[0001] The invention relates to the technical field of water chillers, and in particular to a pressure difference switch with multi-speed regulating functions and a water chiller. Background Art

[0002] At present, large chillers are generally equipped with differential pressure switches. The mainboard of the unit determines whether the water flow of the unit is abnormal by collecting the on-off signal of the differential pressure switch. The specific working principle is: under normal circumstances, the water flow of the unit is greater than the preset flow, so the corresponding water pressure value is also greater than the preset pressure value of the differential pressure switch. The differential pressure switch connects the internal circuit under the action of water pressure, thereby deriving an electrical signal, which allows the staff to know that the water flow of the unit is normal; when the water flow of the unit is lower than the preset flow, the corresponding water pressure value is also lower than the preset pressure value of the differential pressure switch, and the water pressure can no longer maintain the conduction of the differential pressure switch, causing the internal circuit of the differential pressure switch to be disconnected and the electrical signal to be interrupted, and the staff will know that the water flow of the unit is abnormal.

[0003] However, in actual use, because the units require different flow rates, the corresponding differential pressure switches have different preset pressures. Therefore, the differential pressure switches of different units are of different models and cannot be used interchangeably. Summary of the invention

[0004] The invention discloses a pressure difference switch with multi-speed adjustment function and a chiller, which solves the problem that the pressure difference switches of different units are of different models and cannot be used universally.

[0005] According to one aspect of the present invention, a differential pressure switch is disclosed, comprising: a shell, the shell having a accommodating chamber; a valve core, the valve core is movably arranged in the accommodating chamber, the valve core divides the accommodating chamber into a first pressure chamber and a second pressure chamber; an elastic member, the elastic member is arranged in the first pressure chamber, the first end of the elastic member is arranged on the valve core, and the second end of the elastic member is arranged on the inner wall of the first pressure chamber, the elastic member is used to apply a pre-force to the valve core; a pressure difference is formed between the first pressure chamber and the second pressure chamber under the action of external pressure, the valve core is displaced under the action of the pressure difference and triggers the pressure difference switch to open or close; an adjusting device, the adjusting device is connected to the valve core, and the adjusting device is used to adjust the initial position of the valve core.

[0006] Furthermore, the elastic member includes a spring, a first end of the spring is arranged on the valve core, and a second end of the elastic member is arranged on an inner wall of the first pressure chamber opposite to the valve core; the initial position of the valve core includes: a first initial position and a second initial position, in the first initial position, the spring is in a natural state, and the spring does not apply a pre-force to the valve core; in the second initial position, the valve core squeezes or stretches the spring, and the spring elastically deforms so that the spring applies a pre-force to the valve core.

[0007] Furthermore, the regulating device comprises an regulating rod, the regulating rod is passed through the housing, a first end of the regulating rod abuts against the valve core, and a second end of the regulating rod is located outside the housing.

[0008] Furthermore, the adjusting rod is provided with an external thread, the shell is provided with a screw hole, the adjusting rod is inserted into the screw hole and threadedly engaged, and the adjusting rod rotates in the screw hole to control the valve core to switch between different initial positions.

[0009] Furthermore, the pressure differential switch also includes: a micro switch, the micro switch has a contact, the setting position of the contact corresponds to the position of the valve core, and the pressure differential switch is triggered to open after the valve core contacts the contact.

[0010] Furthermore, the valve core also includes a valve stem for contacting the contact point, and a plurality of the contact points are arranged at intervals on the moving path of the valve stem.

[0011] Furthermore, a groove is provided at the edge of the valve core, and a protrusion matching the groove is provided on the inner wall of the shell, the protrusion is located in the groove, and the groove and the protrusion are sealed to isolate the first pressure chamber and the second pressure chamber; the valve core also has a drainage position, the valve core is in the drainage position, the protrusion is outside the groove, the groove and the inner wall of the shell form a drainage channel, and the first pressure chamber and the second pressure chamber are connected through the drainage channel.

[0012] Furthermore, the shell includes: an upper end cover, on which the protrusion is arranged; a lower end cover, on which a drain valve is arranged, the upper end cover and the lower end cover are buckled together to form the accommodating cavity, and when the valve core is in the drain position, the groove and the inner wall of the lower end cover form the drainage channel.

[0013] Furthermore, the upper end cover and the valve core form the first pressure chamber; the lower end cover and the valve core form the second pressure chamber.

[0014] According to another aspect of the present invention, a chiller is disclosed, comprising the above-mentioned pressure difference switch.

[0015] The pressure differential switch of the present invention, by providing an adjusting device and an elastic member in the first pressure chamber, can adjust the valve core to a desired initial position through the adjusting device according to actual needs, so that the pre-force applied by the elastic member to the valve core is changed. Since the pre-force applied by the elastic member will offset a part of the pressure difference, the pressure difference value required to trigger the differential pressure switch to open is changed, thereby improving the versatility of the pressure differential switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a pressure difference switch according to an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A partial enlarged view of middle A;

[0018] Legend: 11, shell; 111, first pressure chamber; 112, second pressure chamber; 113, upper end cover; 114, lower end cover; 115, protrusion; 116, drain valve; 12, valve core; 121, groove; 122, valve stem; 13, elastic member; 14, adjusting device; 141, adjusting rod; 21, micro switch; 22, contact; 22a, first contact; 22b, second contact. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments, but is not limited to the contents of the description.

[0020] like Figure 1 and Figure 2 As shown, the present invention discloses a differential pressure switch, comprising: a housing 11, a valve core 12, an elastic member 13 and an adjusting device 14, wherein the housing 11 has an accommodating chamber; the valve core 12 is movably arranged in the accommodating chamber, the valve core 12 divides the accommodating chamber into a first pressure chamber 111 and a second pressure chamber 112, and the valve core 12 has an initial position and an open position; the elastic member 13 is arranged in the first pressure chamber 111, the first end of the elastic member 13 is arranged on the valve core 12, and the second end of the elastic member 13 is arranged on the inner wall of the first pressure chamber 111, The elastic member 13 is used to apply a pre-force to the valve core 12; a pressure difference is formed between the first pressure chamber 111 and the second pressure chamber 112 under the action of external pressure, and the valve core 12 is displaced under the action of the pressure difference and triggers the pressure differential switch to open or close; the adjusting device 14 is connected to the valve core 12, and the adjusting device 14 is used to adjust the initial position of the valve core 12. The adjusting device 14 changes the pre-force applied by the elastic member 13 to the valve core 12 by changing the initial position of the valve core 12, so as to adjust the pressure difference value required to trigger the differential pressure switch to open.

[0021] In the prior art, no spring is provided. When there is water flow in the water chamber pipe of the unit, the water flows into the first pressure chamber 111 and the second pressure chamber 112 respectively, and a pressure difference is generated. The valve core 12 is displaced under the action of the pressure difference and triggers the pressure difference switch to open or close.

[0022] The pressure differential switch of the present invention, by providing an adjusting device 14 and an elastic member 13 in the first pressure chamber 111, can adjust the valve core 12 to a desired initial position through the adjusting device 14 according to actual needs, so that the pre-force applied by the elastic member 13 to the valve core 12 is changed. Since the pre-force applied by the elastic member 13 will offset a part of the pressure difference, the pressure difference value required to trigger the differential pressure switch to open is changed, thereby improving the versatility of the pressure differential switch.

[0023] In the above embodiment, the elastic member 13 includes a spring, the first end of the spring is arranged on the valve core 12, and the second end of the elastic member 13 is arranged on the inner wall of the first pressure chamber 111 opposite to the valve core 12; the initial position of the valve core 12 includes: a first initial position and a second initial position, in which the spring is in a natural state and the spring does not apply a pre-force to the valve core 12; in the second initial position, the valve core 12 squeezes or stretches the spring, and the spring elastically deforms so that the spring applies a pre-force to the valve core 12. In the pressure differential switch of the present invention, when the valve core 12 is adjusted to the first initial position by the adjusting device 14, the spring is in a natural state, that is, the spring does not elastically deform, and the spring does not apply a pre-force to the valve core 12. At this time, the pressure differential value required to open the pressure differential switch is small; if the pressure differential value required to open the pressure differential switch is to be increased, the valve core 12 can be adjusted to the second initial position by the adjusting device 14, at which time, the spring elastically deforms and generates a pre-force on the valve core 12, thereby requiring a larger pressure differential to open the pressure differential switch, thereby improving the versatility of the pressure differential switch.

[0024] It can be understood that in this embodiment, only the case where the initial positions are two is taken as an example, and in the specific implementation process, three, four or more initial positions can be set according to actual needs. The principle is the same as that of this embodiment and will not be repeated here.

[0025] In the above embodiment, the adjusting device 14 includes an adjusting rod 141, the adjusting rod 141 is passed through the housing 11, the first end of the adjusting rod 141 abuts against the valve core 12, and the second end of the adjusting rod 141 is located outside the housing 11. The differential pressure switch of the present invention can improve the adjustment efficiency of the valve core 12 by providing the adjusting rod 141, facilitate installation and maintenance, and improve work efficiency.

[0026] In the above embodiment, the adjusting rod 141 is provided with an external thread, the housing 11 is provided with a screw hole, the adjusting rod 141 is inserted into the screw hole and threadedly matched, and the adjusting rod 141 rotates in the screw hole to control the valve core 12 to switch between different initial positions. The differential pressure switch of the present invention, by providing an external thread on the adjusting rod 141 and threadedly matching with the screw hole on the housing 11, can control the valve core 12 by rotating the adjusting rod 141 in the screw hole, so that the valve core switches between different initial positions, greatly improving the convenience of operation and effectively improving work efficiency.

[0027] exist Figure 1 In the illustrated embodiment, the pressure differential switch further comprises: a micro switch 21, the micro switch 21 having a contact 22, the setting position of the contact 22 corresponds to the position of the valve core 12, and the valve core 12 contacts the contact 22 to trigger the pressure differential switch to open. The pressure differential switch of the present invention, by providing the micro switch 21, enables the valve core 12 to contact the contact 22, thereby triggering the pressure differential switch.

[0028] In the above embodiment, the valve core 12 further includes a valve stem 122 for contacting the contact point 22 , and a plurality of contact points 22 are arranged at intervals on the moving path of the valve stem 122 .

[0029] The number of micro switches 21 corresponds to the number of initial positions, taking two initial positions as an example:

[0030] When the valve core 12 is at the first initial position, the valve stem 122 has not yet contacted the first contact 22a. When the pressure difference pushes the valve core 12 to move, the valve core 12 touches the first contact 22a. At this time, the first micro switch is energized and feedback signals are fed back. The main board receives the signal of the first micro switch, indicating that the corresponding opening pressure of the pressure difference switch is the first opening pressure.

[0031] When the valve core 12 is located at the second initial position, the valve stem 122 contacts the first contact 22a, and the valve stem 122 does not contact the second contact 22b. When the pressure difference pushes the valve core 12 to move, the valve core 12 touches the first contact 22a and the second contact 22b at the same time. The first micro switch and the second micro switch are both powered on and feedback signals. The main board receives the signals from the first micro switch and the second micro switch, indicating that the corresponding opening pressure of the pressure difference switch is the second opening pressure.

[0032] And so on.

[0033] When the valve core 12 is located at the nth initial position, the valve stem 122 contacts the first contact 22a, ..., the valve stem 122 contacts the n-1th contact, and the valve stem 122 contacts the nth contact. When the pressure difference pushes the valve core 12 to move, the valve core 12 touches the first contact 22a, ..., and the nth contact at the same time, and the first microswitch, ..., and the nth microswitch are all energized and feedback signals. The main board receives signals from the first microswitch, ..., and the nth microswitch, indicating that the corresponding opening pressure of the pressure difference switch is the nth opening pressure.

[0034] exist Figure 1 In the embodiment shown, a groove 121 is provided at the edge of the valve core 12, and a protrusion 115 matching the groove 121 is provided on the inner wall of the housing 11, the protrusion 115 is located in the groove 121, and the groove 121 and the protrusion 115 are sealed to isolate the first pressure chamber 111 and the second pressure chamber 112; the valve core 12 also has a drainage position, the valve core 12 is in the drainage position, the protrusion 115 is outside the groove 121, the groove 121 and the inner wall of the housing 11 form a drainage channel, and the first pressure chamber 111 and the second pressure chamber 112 are connected through the drainage channel. The pressure differential switch of the present invention can facilitate drainage by providing a drainage structure, avoiding water accumulation inside the differential pressure switch, which causes the internal water to freeze and damage the pressure differential switch in cold weather.

[0035] In the above embodiment, the housing 11 includes: an upper end cover 113 and a lower end cover 114, the upper end cover 113 is provided with a protrusion 115; the lower end cover 114 is provided with a drain valve 116, the upper end cover 113 and the lower end cover 114 are buckled together to form a receiving cavity, and when the valve core 12 is in the drain position, the groove 121 and the inner wall of the lower end cover 114 form a drain channel. The differential pressure switch of the present invention can be easily drained by providing a drainage structure, avoiding water accumulation inside the differential pressure switch, which causes the internal water to freeze and damage the differential pressure switch in cold weather, and affects the sealing of components.

[0036] In the above embodiment, the upper end cover 113 and the valve core 12 enclose a first pressure chamber 111 ; the lower end cover 114 and the valve core 12 enclose a second pressure chamber 112 .

[0037] According to another aspect of the present invention, a chiller is disclosed, comprising the above-mentioned pressure difference switch.

[0038] The differential pressure switch of the present invention is used to detect the water flow in the water chamber pipe of the unit. When in use, when the first gear pressure is required, the valve core is adjusted to the first position through the adjustment device 14. At this time, the spring is not compressed, the preset pressure is the minimum, and when there is water flow in the water chamber pipe of the unit, the water flows in from the water inlets on the low-pressure side of the upper end cover and the high-pressure side of the lower end cover respectively. Because the water pressure on the lower end cover side is higher than the water pressure on the upper end cover side, the valve core moves from bottom to top under the action of the pressure difference, and the valve stem on the valve core touches the first contact 22a, thereby converting the mechanical movement of the valve stem into an electrical signal, which is fed back to the main board of the unit, indicating that the differential pressure switch is turned on.

[0039] On the contrary, when the water flow is abnormal, there is a lack of water / water flow in the water chamber of the unit, the pressure difference between the upper end cover and the lower end cover decreases, the valve core lacks the power to move upward, and the reverse force is generated due to the compression of the spring structure in the early stage, and the valve core moves downward under the action of the reverse force. At this time, the valve stem on the valve core is separated from the first contact 22a, no electrical signal is generated, and the unit does not receive the signal, indicating that the pressure difference switch is disconnected.

[0040] When the water flow that needs to be judged increases, the corresponding water pressure will also increase, and the preset pressure difference value will also increase. The valve core is adjusted to the second gear through the adjustment device 14, so that the valve core compresses the spring, and the valve stem touches the first contact 22a and approaches the second contact. The reaction force of the spring acts on the valve core, so that a greater pressure is required to push the valve core, which is equivalent to increasing the preset value of the pressure difference. When there is water flow in the water chamber connecting pipe of the unit, because the water pressure on the lower end cover side is higher than the combined force of the water pressure on the upper end cover side and the spring elastic force, that is, when the pressure difference on both sides is higher than the preset value, the valve core moves upward, and on the basis of touching the first contact 22a, it touches the second contact at the same time, thereby converting the mechanical movement of the valve stem into an electrical signal, which is fed back to the main board of the unit, indicating that the pressure difference switch is turned on.

[0041] On the contrary, when the water flow is abnormal, there is a lack of water / water flow in the water chamber of the unit, the pressure difference between the upper and lower end covers decreases, the valve core lacks the power to move upward, and the reverse force is generated due to the compression of the spring structure in the early stage, and the valve core moves downward under the action of the reverse force. At this time, the valve stem on the valve core is separated from the control element, no electrical signal is generated, the unit does not receive the signal, and the differential pressure switch is disconnected.

[0042] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A differential pressure switch, characterized in that: include: A housing (11), wherein the housing (11) has a receiving cavity; a valve core (12), the valve core (12) being movably disposed in the accommodating chamber, the valve core (12) dividing the accommodating chamber into a first pressure chamber (111) and a second pressure chamber (112); an elastic member (13), wherein the elastic member (13) is arranged in the first pressure chamber (111), a first end of the elastic member (13) is arranged on the valve core (12), and a second end of the elastic member (13) is arranged on an inner wall of the first pressure chamber (111), and the elastic member (13) is used to apply a pre-force to the valve core (12); A pressure difference is formed between the first pressure chamber (111) and the second pressure chamber (112) under the action of external pressure, and the valve core (12) is displaced under the action of the pressure difference and triggers the pressure difference switch to open or close; An adjusting device (14), the adjusting device (14) being connected to the valve core (12), and the adjusting device (14) being used to adjust an initial position of the valve core (12); The valve core (12) is provided with a groove (121) on its edge, and the housing (11) is provided with a protrusion (115) matching the groove (121) on its inner wall, the protrusion (115) being located in the groove (121), and the groove (121) and the protrusion (115) being sealed and matched to isolate the first pressure chamber (111) and the second pressure chamber (112); The valve core (12) also has a drainage position. When the valve core (12) is in the drainage position, the protrusion (115) is outside the groove (121). The groove (121) and the inner wall of the housing (11) form a drainage channel. The first pressure chamber (111) and the second pressure chamber (112) are connected through the drainage channel.

2. The differential pressure switch according to claim 1, characterized in that: The elastic member (13) comprises a spring, a first end of the spring is arranged on the valve core (12), and a second end of the elastic member (13) is arranged on an inner wall of the first pressure chamber (111) opposite to the valve core (12); The initial position of the valve core (12) includes: a first initial position and a second initial position. In the first initial position, the spring is in a natural state and the spring does not apply a pre-force to the valve core (12). In the second initial position, the valve core (12) squeezes or stretches the spring, and the spring elastically deforms so that the spring applies a pre-force to the valve core (12).

3. The differential pressure switch according to claim 1, characterized in that: The regulating device (14) comprises a regulating rod (141), wherein the regulating rod (141) is passed through the housing (11), a first end of the regulating rod (141) abuts against the valve core (12), and a second end of the regulating rod (141) is located outside the housing (11).

4. The differential pressure switch according to claim 3, characterized in that: The adjusting rod (141) is provided with an external thread, and the housing (11) is provided with a screw hole. The adjusting rod (141) is inserted into the screw hole and threadedly engaged. The adjusting rod (141) controls the valve core (12) to switch between different initial positions by rotating in the screw hole.

5. The differential pressure switch according to claim 1, characterized in that: The pressure differential switch also includes: A micro switch (21), wherein the micro switch (21) has a contact (22), the setting position of the contact (22) corresponds to the position of the valve core (12), and the valve core (12) triggers the pressure difference switch to open after contacting the contact (22).

6. The differential pressure switch according to claim 5, characterized in that: The valve core (12) further comprises a valve stem (122) for contacting the contact point (22), and a plurality of the contact points (22) are arranged at intervals on a moving path of the valve stem (122).

7. The differential pressure switch according to claim 1, characterized in that: The housing (11) comprises: An upper end cover (113), wherein the protrusion (115) is provided on the upper end cover (113); A lower end cover (114) is provided with a drainage valve (116), the upper end cover (113) and the lower end cover (114) are buckled together to enclose the accommodating cavity, and when the valve core (12) is located at the drainage position, the groove (121) and the inner wall of the lower end cover (114) enclose the drainage channel.

8. The pressure differential switch according to claim 7, characterized in that: The upper end cover (113) and the valve core (12) enclose the first pressure chamber (111); The lower end cover (114) and the valve core (12) enclose the second pressure chamber (112).

9. A chiller, characterized in that: A differential pressure switch comprising the pressure differential switch according to any one of claims 1 to 8.

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